Home

Removal and Installation

1. d2 0 15 mm 0 0059 in e If it exceeds the limit a large difference in dimensions replace 0 39 in main bearing cap bolt with a new one saicagiee CONNECTING ROD BOLT OUTER DIAMETER e Measure the outer diameter d at position as shown e If reduction appears in a position other than d regard it as d 17mm 0 67 in Limit 7 75 mm 0 3051 in e When d exceeds the limit when it becomes thinner replace connecting rod bolt with a new one PBIC4016E CLOGGED OR DAMAGED OIL FILTER FOR INTAKE VALVE TIMING CONTROL e Make sure that there is no foreign material on the oil filter and check it for clogging Clean it if necessary e Check the oil filter for damage Replace it if necessary PBIC3273J FLYWHEEL DEFLECTION M T MODELS e Measure the deflection of flywheel contact surface to clutch with a dial indicator A e Measure the deflection at 210 mm 8 27 in diameter Limit 0 45 mm 0 0177 in or less e If measured value is out of the standard replace flywheel e If a trace of burn or discoloration is found on the surface repair it with sandpaper CAUTION When measuring keep magnetic fields such as dial indicator stand away from signal plate of the rear end of crankshaft PBIC4006E MOVEMENT AMOUNT OF FLYWHEEL M T MODELS CAUTION Never disassemble double mass flywheel Movement Amount of Thrust Fore and Aft Direction e Measure the movement am
2. INSPECTION AFTER INSTALLATION The following are procedures for checking fluids leak lubricates leak Before starting engine check oil fluid levels including engine coolant and engine oil If less than required quantity fill to the specified level Refer to Gl 42 Recommended Chemical Product and Sealant Use procedure below to check for fuel leakage Turn ignition switch ON with engine stopped With fuel pressure applied to fuel piping check for fuel leak age at connection points Start engine With engine speed increased check again for fuel leakage at connection points Run engine to check for unusual noise and vibration NOTE If hydraulic pressure inside timing chain tensioner drops after removal installation slack in the guide may generate a pounding noise during and just after engine start However this is normal Noise will stop after hydraulic pressure rises Warm up engine thoroughly to make sure there is no leakage of fuel or any oil fluids including engine oil and engine coolant Bleed air from lines and hoses of applicable lines such as in cooling system After cooling down engine again check oil fluid levels including engine oil and engine coolant Refill to the specified level if necessary Summary of the inspection items Item Before starting engine Engine running After engine stopped Engine coolant Level Leakage Level Engine oil Level Leakage Level Other oils and fluid Level L
3. Be sure to cover openings of disconnected pipes with plug or plastic bag to avoid fuel leakage and entry of foreign materials 9 When removing fuel hose quick connector at vehicle piping side perform as follows Remove quick connector cap b Hold the sides of the connector push in tabs and pull out the tube The figure is shown for reference only e If the connector and the tube are stuck together push and pull several times until they start to move Then disconnect them by pulling CAUTION e The tube can be removed when the tabs are completely depressed Do not twist it more than necessary Do not use any tools to remove the quick connector e Keep the resin tube away from heat Be especially careful when welding near the tube Do not bend or twist the tube during installation and removal Do not remove the remaining retainer on tube When the tube is replaced also replace the retainer with a new one EM 129 Revision July 2007 Prevent acid liquid such as battery electrolyte etc from getting on the resin tube Pull i Push in tabs SFE562A 2008 Sentra INTAKE MANIFOLD lt SERVIGEINFORMATION gt ooo o Retainer color Green e To keep clean the connecting portion and to avoid damage and foreign materials cover them completely with plastic bags or something similar 10 Loosen mounting bolts diagonally and remove the electric throttle control actuator CAUTION Handle carefully to avoid
4. 26 Install oil pan upper Refer to EM 24 NOTE Install the rear oil seal after installing the oil pan upper 27 Install rear oil seal Refer to EM 24 28 Install flywheel M T models or drive plate 1 CVT models e Secure crankshaft using Tool A and tighten bolts crosswise over several times Tool number KV11105210 J 44716 PBIC3998E Revision July 2007 EM 79 2008 Sentra CYLINDER BLOCK lt SERVIGEINFORMATION gt 0 EMR2007 e Install pilot converter 1 drive plate 2 and reinforcement plate 3 as shown CVT models A Crankshaft rear end B R e Using a suitable tool of 33 mm 1 30 in in diameter press fit pilot converter into the end of crankshaft until it stops CVT models NOTE M T models have no pilot converter and reinforcement plate 29 Install knock sensor 1 with connector facing toward the rear of engine A __ Cylinder block left side lt Engine front CAUTION e Never tighten bolts while holding the connector If any impact by dropping is applied to knock sensor replace it with a new one NOTE e Make sure that there is no foreign material on the cylinder _ block mating surface and the back surface of knock sensor e Make sure that knock sensor does not interfere with other parts 30 Install crankshaft position sensor POS and crankshaft position sensor POS cover CAUTION Avoid impacts such as a dropping Keep it away from metal particles Nev
5. A _ ldentification code B Front mark C__ Piston grade number WBIA0830E Piston Selection Table Unit mm in Grade number Mark 1 2 or no mark piston only Cylinder bore Inner diameter 84 000 84 010 3 3071 3 3075 84 010 84 020 3 3075 3 3079 Piston skirt diameter 83 970 83 980 3 3059 3 3063 83 980 83 990 3 3063 3 3067 NOTE e Piston is available together with piston pin as an assembly e There is no piston pin piston pin hole grade HOW TO SELECT CONNECTING ROD BEARING When New Connecting Rod and Crankshaft are Used 1 Apply connecting rod big end diameter grade stamped C on connecting rod side face to the row in the Connecting Rod Bearing Selection Table Oil hole Cylinder number Small end diameter grade mow gt Front mark PBIC3262J 2 Apply crankshaft pin journal diameter grade stamped on crank shaft front side to the column in the Connecting Rod Bearing Selection Table No 1 pin journal diameter grade No 2 pin journal diameter grade No 3 pin journal diameter grade No 4 pin journal diameter grade No 1 main journal diameter grade No 2 main journal diameter grade PBIC3261J No 3 main journal diameter grade No 4 main journal diameter grade rIrI0 nmo OUV P No 5 main journal diameter grade 3 Read the symbol at the cross point of selected row and column in the Connecting Rod Bearing Selection Tab
6. Install water drain plug 1 to cylinder block lt Engine front e Apply liquid gasket to the drain plug thread Use Genuine Silicone RTV Sealant or equivalent Refer to GI 42 Recommended Chemical Product and Sealant 9 8 N m 1 0 kg m 87 in Ib Remove dust dirt and engine oil on the bearing mating sur faces of cylinder block and main bearing cap PBIC3228J Install thrust bearings to the both sides of the No 3 journal hous ing B on cylinder block lt Engine front e Install thrust bearings with the oil groove A facing crankshaft arm outside Install the main bearings paying attention to the direction CAUTION Before installing main bearings apply new engine oil to the bearing surface inside Do not apply new engine oil to the back surface but thoroughly clean it e When installing align main bearing to the center position of cylinder block and main bearing cap Revision July 2007 EM 75 2008 Sentra CYLINDER BLOCK lt SERVIGEINFORMATION gt SS _EMR200 The difference A between main bearing upper 1 and main bearing lower 3 should be 0 85 mm 0 033 in or less when installing 2 Cylinder block 4 Main bearing cap PBIC3237J Ensure the oil holes on cylinder block and oil holes A on the main bearings 1 are aligned PBIC3236J 6 Install signal plate to crankshaft if removed 7 Set the signal plate with the flange facing toward the counter weight side engine
7. Remove timing chain for balancer unit and crankshaft sprocket Loosen bolts in reverse order as shown and remove balancer unit e Use Torx socket size E14 CAUTION Do not disassemble balancer unit INSPECTION AFTER REMOVAL Timing Chain Revision July 2007 EM 159 PBIC5314E WBIA0886E 2008 Sentra TIMING CHAIN lt SERVIGEINFORMATION gt TT Check the timing chain for cracks or serious wear If a defect is detected replace it PBICO282E Balancer Unit Bolt Outer Diameter e Measure outer diameters d1 d2 at the two positions as shown e Measure d2 within the range A e If the value difference d1 d2 exceeds the limit a dimension dif SRDE 40mm 1 57in 30mm 1 18in ference is large replace it with a new one Limit 0 15 mm 0 0059 in or more AT d1 10mm 0 39in Measuring Point Measuring Point KBIAO126E INSTALLATION NOTE There may be two color variations of the link marks link colors on the timing chain There are 26 links between the gold yellow mating marks on the timing chain and 64 links between the cam shaft sprocket gold yellow link and the crankshaft sprocket orange blue link on the timing chain side without the tensioner 1 Make sure the crankshaft key points straight up 2 Install the balancer unit and tighten the bolts in the numerical order as shown CAUTION e When reusing a bolt check its outer diameter before installation Fol
8. 0 joi 01 E 43 968 43 969 1 7310 1 7311 o1fotjor 1 1 112 ae E heses soor 708173100 o1 o1 o1 oonarocaa Ea AS eb 1 79005 7a oso 43 964 43 965 11 7309 01 01 eae 12 2 HAAA 43 963 43 964 1 7308 1 7309 23 43 962 43 963 1 7308 1 7308 1 anan 2 paapa EEO S ee OBESE Spp 43 960 43 961 a 7307 1 ean i BE BE m __ 43 959 43 960 1 7307 1 7307 12 12 12 2 2 2 23 23 23 3 3 3 n 8 058 43 950 17306 1 7207 fi2fi2 2 2 43 957 43 958 1 7306 ean 2 2 a 3 oe a 43 954 43 955 4 7305 ae 2 23 23 23 34 34 34 43 953 43 954 1 7304 1 7305 23 23 23 agan 34 34 34 a a 47 002 47 003 1 8505 1 8505 47 003 47 004 1 8505 1 8505 a N Bra ee NIN nim ojojoj NINNIN Alc xrl o Ziar noj DdD U c a PBIC4077E Connecting Rod Bearing Grade Table Unit mm in Grade number Thickness Identification color Remarks 0 1 494 1 497 0 0588 0 0589 Black 1 1 497 1 500 0 0589 0 0591 Brown 2 1 500 1 503 0 0591 0 0592 Green Grade anid colorare tessame for upper and lower bearings 3 1 503 1 506 0 0592 0 0593 Yellow 4 1 506 1 509 0 0593 0 0594 Blue Revision July 2007 EM 83 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt MR20DE Grade number Thickness Identification cobor Remarks UPR 1 494 1 497 0 05
9. Figure shows drive plate CVT models PBICS226 Lift the engine with a hoist to install it onto widely use engine stand CAUTION e Use the engine stand that has a load capacity approximately 135 kg 298 Ib or more large enough for supporting the engine weight If the load capacity of stand is not adequate remove the following parts beforehand to reduce the poten tial risk of overturning stand Exhaust manifold Refer to EM 21 Rocker cover Refer to EM 30 NOTE The figure shows an example of widely used engine stand A that can support mating surface of transaxle with flywheel M T models or drive plate CVT models removed CAUTION Before removing the hanging chains make sure the engine stand is stable and there is no risk of overturning PBIC3227J Remove oil pan upper and lower Refer to EM 24 Remove cylinder head Refer to EM 61 Remove thermostat housing Refer to CO 19 Remove knock sensor CAUTION Carefully handle knock sensor avoiding shocks Remove crankshaft position sensor POS cover and crankshaft position sensor POS CAUTION Avoid impacts such as a dropping Revision July 2007 EM 72 2008 Sentra 10 11 12 13 14 15 CYLINDER BLOCK lt SERVICEINFORMATION gt MRO Never disassemble Keep it away from metal particles Never place sensor in a location where it is exposed to magnetism Remove oil filter for intake valve timing control Remo
10. O Nem kg m ft lb PBIC3543J Revision July 2007 EM 64 2008 Sentra Disassembly and Assembly CYLINDER HEAD lt SERVICE INFORMATION gt MR20DE 1 Valve collet 2 Valve spring retainer 3 valve Spring EXHI with valve spring seat 4 Valve oil seal 5 Valve guide EXH 6 Valve seat EXH 7 Valve EXH 8 Valve INT 9 Valve seat INT 10 Cylinder head 11 Valve guide INT 12 Spark plug Valve spring INT 13 o f with valve spring seat A Refer to EM 66 B Refer to EM 66 INFOID 0000000001849604 DISASSEMBLY 1 2 3 7 8 Remove spark plug using suitable tool Remove valve lifter e Identify installation positions and store them without mixing them up Remove valve collet e Compress valve spring using Tool attachment and adapter A Remove valve collet using a suitable magnet hand CAUTION When working be careful not to damage valve lifter holes Tool number KV101092S0 J 26336 B PBIC3209J Remove valve spring retainer and valve spring with valve spring seat CAUTION Never remove valve spring seat from valve spring Push valve stem to combustion chamber side and remove valve NOTE Identify installed positions and store them without mixing them up Remove valve oil seal using Tool A Tool number KV10107902 J 38959 PBIC3210J When valve seat must be replaced refer to EM 66 Inspection After Disassembly to removal When valve guide must be replac
11. Oil splash Big end Small end diameter grade diameter grade o 2 Cylinder ior pp No S A PET X code Reference code Bearing stopper groove SBIA0282E 2 Apply pin diameter grade stamped on crankshaft front side to the column in the Connecting Rod Bearing Selection Table 3 Read the symbol at the cross point of selected row and column in the Connecting Rod Bearing Selection Table 4 Apply the symbol obtained to connecting rod bearing grade table to select e A Journal diameter e B Pin diameter WBIA0901E When Crankshaft and Connecting Rod are Reused 1 Measure dimensions of the big end inner diameter of connecting rod and outer diameter of crankshaft pin individually 2 Apply the dimension measured to the Connecting Rod Bearing Selection Table below Revision July 2007 EM 189 2008 Sentra lt SERVICE INFORMATION gt Connecting Rod Bearing Selection Table CYLINDER BLOCK Connecting rod big end diameter Crankshaft pin journal diameter Inner diameter Unit mm in Outer diameter Unit mm in 44 974 44 973 1 7706 1 7706 48 000 48 001 1 8898 1 8898 48 001 48 002 1 8898 1 8898 48 002 48 003 1 8898 1 8899 48 005 48 006 1 8900 1 8900 48 008 48 009 1 8901 1 8901 44 973 44 972 1 7706 1 7705 44 972 44 971 1 7705 1 7705 44 971 44 970 1 7705 1 7705 44 970 44 969 1 7705 1 7704 44
12. g Apply with new engine oil Nem kg m in Ib WBIA0482E Remove the flywheel M T models or drive plate CVT models Hold the crankshaft with a stopper plate and use a suitable tool to remove the bolts CAUTION Be careful not to damage the flywheel contact surface for the clutch disc NOTE e The flywheel two block construction allows movement in response to transmission side pressure or when twisted in its rotational direction therefore some amount of noise is nor mal Remove pilot converter using Tool CVT models Ne Uae Pilot converter OAL hop WBIA0483E Revision July 2007 EM 181 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt RSD 9 Remove the piston and connecting rod assemblies a Position the crankshaft and corresponding connecting rod to be removed to the bottom dead center stroke b Remove the connecting rod cap Number the cap so it can be assembled in the same position c Using a hammer handle or similar tool push the piston and con necting rod assembly out of the top of the cylinder block Num ber the piston and rod so it can be assembled in the same position e Before removing the piston and connecting rod assembly check the connecting rod side clearance Refer to EM 194 BEICOZSOE Inspection After Disassembly 10 Remove the connecting rod bearings If reusing number them so they can be assembled in the same position and direction CAUTION Wh
13. 2 0460 1 1 1 51 967 51 968 2 0459 2 0460 1 1 12 12 51 966 51 967 2 0459 2 0459 51 965 51 966 2 0459 2 0459 Falta 2 12 12 2 2 2 23 12 2 23 23 zlefe ealesles 23 aTe Te falealea a a as 3 ealzalzal a e Ta fos aa aa aa 4 5 a5 3 4 45 45l45 ajoj 51 964 51 965 2 0458 2 0459 2 51 963 51 964 2 0458 2 0458 2 51 962 51 963 2 0457 2 0458 2 2323 23 23 23 3 4 34 34 4 4 23 3 3 3 34 34 34 4 4 4 45 45 45 5 2 a 3 oq aaloa 4 4 aslasle5 5 5 el lt i c 2 51 959 51 960 2 0456 2 0457 23 23 23 3 3 3 134 34 34 4 51 961 51 962 2 0457 2 0457 23 3 3 3 34 4 4 4 45 45 45 5 5 5 51 960 51 961 2 0457 2 0457 2 23 23 3 3 34 34 4 4 45 45 45 5 5 5 5 4 4145 45 45 5 5 5 5 5 Revision July 2007 EM 86 MR20DE PBIC4078E 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt MR20DE Main Bearing Selection Table No 2 and 3 journals x Cylinder block CRER pac fcc cl Fc as main bearing housing inner Sle kl elelelalelelse sl a slalalalalslal s n TEy Py ST TPT TPT PoOlsoOlsMoO sMosMols woH HWO H MW wW wW w diameter SIS SDIS O S SGISIG S G S G G G G a a aj o Unit mm in NINININI NANANA AA NNNNA a D NINNIN NNI N NJN N NENT NIN TNT NTN TNT NTN Cran
14. 2 1640 2 1639 Grade No S 54 964 54 963 2 1639 2 1639 Grade No T 54 963 54 962 2 1639 2 1639 Grade No U 54 962 54 961 2 1639 2 1638 Grade No V 54 961 54 960 2 1638 2 1638 Grade No W 54 960 54 959 2 1638 2 1637 Grade No X 54 959 54 958 2 1637 2 1637 Grade No Y 54 958 54 957 2 1637 2 1637 Grade No 4 54 957 54 956 2 1637 2 1636 Grade No 7 54 956 54 955 2 1636 2 1636 Center distance r 49 60 50 04 1 9528 1 9701 Out of round X Y Standard Less than 0 005 0 0002 Taper A B Standard Less than 0 005 0 0002 Runout TIR Limit Less than 0 05 0 002 Standard 0 10 0 26 0 0039 0 0102 Free end play Limit 0 30 0 0118 Total indicator reading MAIN BEARING Unit mm in 5 KA Oil hole 3 a 2 A A ay ON Engine aw SEM685D Identification color Grade number Thickness UPR LWP Remarks 0 1 973 1 976 0 0777 0 0778 Black 1 1 976 1 979 0 0778 0 0779 Brown 2 1 979 1 982 0 0779 0 0780 Green 3 1 982 1 985 0 0780 0 0781 Yellow Grade and color are the same 4 1 985 1 988 0 0781 0 0783 Blue for upper and lower bearings 5 1 988 1 991 0 0783 0 0784 Pink 6 1 991 1 994 0 0784 0 0785 Purple 7 1 994 1 997 0 0785 0 0786 Orange EM 212 Revision July 2007 2008 Sentra SERVICE DATA AND SPECIFICATIONS SDS lt SERVICE INFORMATION gt QR25DE
15. 3 bore grade Om AQA L 17 Cylinder No 4 bore grade No 1 main bearing housing grade No 2 main bearing housing grade No 3 main bearing housing grade c TrgaoTm7amMmooowD gt No 4 main bearing housing grade A No 5 main bearing housing grade lt x Engine front e If there is a correction stamp mark on cylinder block use it as a correct reference Apply main journal diameter grade stamped on crankshaft front side to column in the Main Bearing Selection Table No 1 pin journal diameter grade No 2 pin journal diameter grade No 3 pin journal diameter grade No 4 pin journal diameter grade No 1 main journal diameter grade No 2 main journal diameter grade No 3 main journal diameter grade PBIC3261J No 4 main journal diameter grade raoa 7m mrmamMmooaOdgwD gt No 5 main journal diameter grade Read the symbol at the cross point of selected row and column in the Main Bearing Selection Table CAUTION There are two main bearing selection tables One is for No 1 4 and 5 journals and the other is for No 2 and 3 journals Make certain to use the appropriate table This is due to differences in the specified clearances Apply the symbol obtained to the Main Bearing Grade Table to select main bearing NOTE Service part is available as a set of both upper and lower When Cylinder Block and Crankshaft are Reused 1 Measure the dimensions of the
16. 348 3 50 0 1378 350 Valve Spring Items Intake Exhaust Free height 44 90 45 10 mm 1 7677 1 7755 in 45 74 45 94 mm 1 8007 1 8086 in Installation height 35 30 mm 1 390 in 35 30 mm 1 390 in Installation load 153 173 N 15 6 17 6 kg 34 39 Ib 139 157 N 14 2 16 0 kg 31 35 lb Height during valve open 26 36 mm 1 0377 in 27 80 mm 1 0944 in Load with valve open 335 377 N 34 2 38 5 kg 75 85 Ib 266 297 N 27 1 30 3 kg 60 67 Ib Identification color White Orange Valve Lifter Unit mm in Items Standard Intake 33 977 33 987 1 3377 1 3381 Valve lifter outer diameter Exhaust 29 977 29 987 1 1802 1 1806 Intake 34 000 34 021 1 3386 1 3394 Valve lifter hole diameter Exhaust 30 000 30 021 1 1811 1 1819 Valve lifter clearance 0 013 0 044 0 0005 0 0017 Valve Guide Unit mm in PBICO184E Items Standard part Service part f Outer diameter 9 523 9 534 0 3749 0 3754 9 723 9 734 0 3828 0 3832 Valve guide Inner diameter Finished size 5 500 5 518 0 2165 0 2172 Cylinder head valve guide hole diameter 9 475 9 496 0 3730 0 3739 9 675 9 696 0 3809 0 3817 Interference fit of valve guide 0 027 0 059 0 0011 0 0023 Items Standard Limit f Intake 0 020 0 053 0 0008 0 0021 Valve guide clearance 0 1 0 004 Exhau
17. 6 L 51 968 51 969 2 0460 2 0460 3 3 3 34 34 34 4 4 4 45 45 45 5 5 56 56 6 6 M 51 967 51 968 2 0459 2 0460 3 3 34 34 34 4 454545 5 56 6 6 6 N 51 966 51 967 2 0459 2 0459 34 34 4 4 4 45 45 45 5 5 5 56 56 56 6 6 6 67 P 51 965 51 966 2 0459 2 0459 34 34 56 56 56 6 6 6 6767 R 51 964 51 965 2 0458 2 0459 4 45 45 45 5 56 56 56 6 6 6 67 67 67 S 51 963 51 964 2 0458 2 0458 4 4 45 45 45 5 5 5 56 56 6 67 67 67 7 T 51 962 51 963 2 0457 2 0458 4 45 45 5 56 56 56 7 U 51 961 51 962 2 0457 2 0457 45 5 5 5 56 6 67 67 7 7 7 v 51 960 51 961 2 0457 2 0457 4 45 45 5 5 56 56 6 67 7 7 7 7 w 51 959 51 960 2 0456 2 0457 45 45 45 5 5 5 56 56 56 6 6 6 Je7 e7 67 7 7 7 7 7 PBIC4079E Main Bearing Grade Table All Journals Unit mm in Grade number Thickness Identification color Remarks 0 1 996 1 999 0 0786 0 0787 Black 1 1 999 2 002 0 0787 0 0788 Brown 2 2 002 2 005 0 0788 0 0789 Green 3 2 005 2 008 0 0789 0 0791 Yellow cde andico are the same 4 2 008 2 011 0 0791 0 0792 Blue for upper and lower bearings 5 2 011 2 014 0 0792 0 0793 Pink 6 2 014 2 017 0 0793 0 0794 Purple 7 2 017 2 020 0 0794 0 0795 White Revision July 2007 EM 87 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt MR20DE Grade
18. B c D E F G H J K L M N P R S T U v W X Y 4 7 r e ryire eire elylre yeiye welyele yeiye eltye ye ety y ly KBIAO149E Revision July 2007 EM 192 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt QR25DE Main Bearing Selection Table No 2 and 4 journals Cylinder block main bearing hausing inner diameter Inner diameter Crankshaft Unit mm journal outer in diameter Outer diameter Unit mm in 58 956 58 957 2 3211 2 3211 58 959 58 960 2 3212 2 3213 R 58 965 58 966 2 3215 2 3215 B 58 966 58 967 2 3215 2 3215 979 54 978 2 1645 978 54 977 2 1644 977 54 976 2 1644 976 54 975 2 1644 975 54 974 2 1643 974 54 973 2 1643 973 54 972 2 1642 972 54 971 2 1642 971 54 970 2 1642 970 54 969 2 1641 969 54 968 2 1641 968 54 967 2 1641 2 967 54 966 2 1640 2 966 54 965 2 1640 23 23 23 965 54 964 2 1639 964 54 963 2 1639 963 54 962 2 1639 962 54 961 2 1638 961 54 960 2 1638 960 54 959 2 1637 959 54 958 2 1637 958 54 957 2 1637 957 54 956 2 1636 956 54 955 2 1636 N N o wo wo wo wo A N 2 N o wo A N wo N a wo A vN Olea SIs A ala w wo w lw lo RLS als wo elel gt gt a s slo o
19. EM Precaution for Liquid Gasket INFOID 0000000001849568 REMOVAL OF LIQUID GASKET SEALING e After removing the bolts and nuts separate the mating surface and remove the sealant using Tool I Tool number KV10111100 J 37228 0 CAUTION Be careful not to damage the mating surfaces _ e In areas where the cutter is difficult to use use a plastic hammer to lightly tap 1 the cutter where the RTV Silicone Sealant is applied Use a plastic hammer to slide the cutter 2 by tapping on the side CAUTION If for some unavoidable reason a tool such as a flat bladed screwdriver is used be careful not to damage the mating sur faces LIQUID GASKET APPLICATION PROCEDURE 1 Using a scraper remove the old Silicone RTV Sealant adhering to the gasket application surface and the mating surface e Remove the sealant completely from the groove of the gasket Scraper application surface bolts and bolt holes 2 Thoroughly clean the gasket application surface and the mating surface and remove adhering moisture grease and foreign materials 3 Attach the sealant tube to the tube presser Use Genuine Silicone RTV Sealant or equivalent Refer to GI 42 Recommended Chemical Product and Sealant Slide T 3 elt s T l WBIAOS66E 4 Apply the sealant without breaks to the specified location using Tool Tool number WS39930000 If there is a groove for the sealant applicat
20. Refer to EM 124 e Crankshaft pulley Refer to EM 156 2 Remove front oil seal from front cover CAUTION Be careful not to scratch front cover INSTALLATION 1 Apply new engine oil to new oil seal and install it using a suitable tool e Install new oil seal in the direction shown Engine inside a Oil seal lip 2 Installation of the remaining components is in reverse order of removal Removal and Installation of Rear Oil Seal REMOVAL QR25DE Suitable tool 56 mm 2 20 in dia SBIAO266E Engine outside Dust seal lip SEM715A INFOID 000000000 1849643 1 Remove the transaxle Refer to MT 67 Removal and Installation or MT 143 Removal and Installation M T CVT 187 Removal and Installation MR20DE CVT 2 Remove flywheel MT or drive plate CVT 3 Remove rear oil seal using suitable tool CAUTION Be careful not to scratch rear oil seal retainer Revision July 2007 EM 165 WBIA0204E 2008 Sentra OIL SEAL lt SERVIGEINFORMATION gt EQ A INSTALLATION 1 Apply new engine oil to new oil seal and install it using a suitable drift e Install new oil seal in the direction shown Engine a Engine inside outside Oil seal lip Dust seal lip SEM715A e Press fit new oil seal straight using a suitable drift to avoid causing burrs or tilting SBIAO280E e Press in the new oil seal to the specified depth as shown PEE Cylinder block rear end face JI R
21. e Tighten bolts in two steps separately in numerical order as shown 1st step 1 96 N m 0 20 kg m 17 in Ib 2nd step 8 33 N m 0 85 kg m 73 in lb e lt Engine front CAUTION Check if rocker cover gasket is not dropped from the instal lation groove of rocker cover PBIC3151J 3 Install spark plug using suitable tool Wrench with a magnet Plug type Platinum tipped to hold spark plug Make NGK Part number PLZKAR6A 11 Gap nominal 1 1 mm 0 043 in CAUTION Never drop or shock it PBIC3871E 4 Install ignition coil CAUTION Handle it carefully and avoid impacts Never disassemble 5 Install intake manifold Refer to EM 18 Revision July 2007 EM 32 2008 Sentra FUEL INJECTOR AND FUEL TUBE lt SERVICE INFORMATION gt MR20DE FUEL INJECTOR AND FUEL TUBE Co m p O n e nt INFOID 0000000001849590 SEC 164 9 10 1 1 0 7 WBIA0779E 1 Bracket 2 Bracket 3 Fuel tube 4 Clip 5 Fuel injector 6 O ring green 7 O ring black Removal and Installation INFOID 0000000001849591 REMOVAL WARNING e Put a CAUTION FLAMMABLE sign in the workshop Be sure to work in a well ventilated area and furnish workshop with a CO2 fire extinguisher Do not smoke while servicing fuel system Keep open flames and sparks away from the work area 1 Release the fuel pressure Refer to EC 83 Fuel Pressure Check 2 Remove quick connector cap 1 from quick connector co
22. eee PARNE OJ 85 0 6 6 48 oye OJ 140 14 103 gt 65 0 6 6 48 A 45 0 4 6 33 0 48 5 4 9 36 NX 2 65 0 6 6 48 3 OJ 45 0 4 6 33 WBIA0826E 1 Torque rod RH 2 Engine mounting Insulator RH 3 Engine mounting bracket RH 4 Bracket 5 Rear torque rod 6 Engine through bolt 7 Engine mounting bracket LH 8 Engine mounting insulator LH Re moval and Installation INFOID 0000000001849611 WARNING e Situate the vehicle on a flat and solid surface Place chocks at front and back of rear wheels Attach proper slingers and bolts described in PARTS CATALOG if engine slingers are not equipped CAUTION Always be careful to work safely avoid forceful or uninstructed operations Do not start working until exhaust system and coolant are cool enough If items or work required are not covered by the engine section follow the the applicable proce dures Always use the support point specified for lifting Use either 2 pole lift type or separate type lift as best you can If board on type is used for unavoid able reasons support at the rear axle jacking point with a transmission jack or similar tool before starting work in preparation for the backward shift of center of gravity Revision July 2007 EM 99 2008 Sentra ENGINE ASSEMBLY lt SERVICE INFORMATION gt MR20DE e For supporting points for lifting and jacking point at rear axle refer to G
23. mm in PBICO184E Description Standard Service Waly ide Outer diameter 10 023 10 034 10 223 10 234 ae ae 0 3946 0 3950 0 4025 0 4029 Inner diameter Finished size 6 000 6 018 0 2362 0 2369 f 9 975 9 996 10 175 10 196 Intake and exhaust valve guide hole diameter 0 3927 0 3935 0 4006 0 4014 Interference fit of valve guide 0 027 0 059 0 0011 0 0023 Standard Intake 0 020 0 053 0 0008 0 0021 or less Valve guide clearance Exhaust 0 030 0 063 0 0012 0 0025 or less Intake 10 1 10 3 0 398 0 406 Projection length L Exhaust 10 0 10 4 0 394 0 409 Valve Seat Unit mm in PBIC2745E Description Standard Service EM 207 2008 Sentra Revision July 2007 SERVICE DATA AND SPECIFICATIONS SDS lt SERVICE INFORMATION gt QR25DE f Intake 36 500 36 516 1 4370 1 4376 37 000 37 016 1 4567 1 4573 Cylinder head seat recess diameter D Exhaust 31 500 31 516 1 2402 1 2408 32 000 32 016 1 2598 1 2605 Intake 0 081 0 113 0 0032 0 0044 Valve seat interference fit Exhaust 0 084 0 116 0 0033 0 0046 Intake 36 597 36 613 1 4408 1 4415 37 097 37 113 1 4605 1 4611 Valve seat outer diameter d Exhaust 31 600 31 616 1 2441 1 2447 32 100 32 116 1 2638 1 2644 Intake 33 5 1 319 Diameter d1 Exhaust 28 0 1 102 Intake 34 8 35 3 1 3701 1 3898 Diameter d2 Exhaust 29 6
24. 0 0018 0 0034 in No 2 3 4 5 0 030 0 071 mm 0 0012 0 0028 in Limit 0 15 mm 0 0059 in If it exceeds the limit replace camshaft or cylinder head or both NOTE Camshaft bracket cannot be replaced as a single part because it is machined together with cylinder head Replace whole cylinder head assembly Camshaft End Play 1 2 Install dial indicator in thrust direction on front end of camshaft Install camshaft in cylinder head Follow the INSTALLATION tightening procedure Read the end play of dial indicator A when camshaft is moved forward backward in direction to axis Standard 0 075 0 153 mm 0 0030 0 0060 in Limit 0 24 mm 0 0094 in e Measure the following parts if out of the standard Dimension A for groove of cylinder head No 1 journal Standard 4 000 4 030 mm 0 1575 0 1587 in Dimension B for camshaft flange Standard 3 877 3 925 mm 0 1526 0 1545 in e Use the standards above and then replace camshaft and or cylinder head PBIC3183J Camshaft Sprocket Runout 1 Put V block on precise flat table and support No 2 and 5 journals of camshaft CAUTION Never support No 1 journal on the side of camshaft sprocket because it has a different diameter from the other four locations Revision July 2007 EM 49 2008 Sentra CAMSHAFT lt SERVIGEINFORMATION gt SS Om 2 Measure the camshaft sprocket runout with a dial indicator A Total indica
25. 0639 0 0642 Grind so that bearing clearance is the specified value Bearing Clearance Unit mm in Standard 0 035 0 045 0 0014 0 0018 Connecting rod bearing oil clearance Limit 0 10 0 0039 Revision July 2007 EM 213 2008 Sentra
26. 1 Remove drive belt Refer to EM 13 Removal and Installation 2 Release the fixed drive belt auto tensioner pulley 3 Loosen bolt and remove drive belt auto tensioner NOTE Revision July 2007 EM 14 2008 Sentra DRIVE BELTS lt SERVIGEINFORMATION gt oo EMR2007 Use TORX socket size T50 4 Remove idler pulley and bracket models without A C INSTALLATION Installation is the reverse order of removal CAUTION When installing drive belt auto tensioner be careful not to interfere with water pump pulley If there is damage greater than peeled paint replace drive belt auto tensioner and or idler pulley Revision July 2007 EM 15 2008 Sentra AIR CLEANER AND AIR DUCT lt SERVICE INFORMATION gt MR20DE AIR CLEANER AND AIR DUCT Co m po n e nt INFOID 0000000001849579 WBIA0823E Air cleaner filter 2 Air cleaner holder 3 Air cleaner case Air duct 5 Mass air flow sensor 6 Air duct Inlet Air duct battery tray 8 Air duct 9 Grommet 10 Resonator A To electronic throttle control actuator Removal and Installation INFOID 0000000001849580 REMOVAL 1 Remove the air duct inlet 2 Remove the air cleaner filter from the air cleaner case Refer to EM 17 Changing Air Cleaner Filter 3 Remove the air duct between air duct inlet and air cleaner case from the air cleaner case 4 Remove the PCV hose 5 Remove the air duct between air cleaner case and electronic throttle control actuator Add marks as
27. 4 Crank engine and then make sure that engine oil comes out from IVT control cover oil hole End cranking after checking WARNING Be careful not to touch rotating parts drive belts idler pul ley and crankshaft pulley etc CAUTION e Engine oil may squirt from IVT control solenoid valve installation hole during cranking Use a shop cloth to pre vent engine oil from splashing on worker engine compo nents and vehicle Do not allow engine oil to get on rubber components such Cvalv installation hole xeiasease as drive belts or engine mount insulators Immediately wipe off any splashed engine oil 5 Clean oil groove between oil strainer and IVT control solenoid valve if engine oil does not come out from IVT control cover oil hole Refer to LU 13 Lubrication Circuit 6 Remove components between IVT control solenoid valve and camshaft sprocket INT and then check each oil groove for clogging e Clean oil groove if necessary Refer to LU 13 Lubrication Circuit 7 After inspection installation of the remaining components is in the reverse order of removal Valve Clearance ieeibnipchonceteieee Inspection e Perform this inspection as follows after removal installation or replacement of the camshaft or any valve related parts or if there are any unusual engine conditions due to changes in valve clearance over time starting idling and or noise 1 Warm up the engine then stop it 2 Remove front RH
28. 4 144 Revision July 2007 EM 104 2008 Sentra SERVICE DATA AND SPECIFICATIONS SDS lt SERVICE INFORMATION gt MR20DE Intake 5 465 5 480 0 2152 0 2157 Valve stem diameter d Exhaust 5 455 5 470 0 2148 0 2154 Valve seat angle a 45 15 45 45 f Intake 1 1 0 043 Valve margin T Exhaust 1 2 0 047 Valve Clearance Unit mm in Items Cold Hot reference data Intake 0 26 0 34 0 010 0 013 0 304 0 416 0 012 0 016 Exhaust 0 29 0 37 0 011 0 015 0 308 0 432 0 012 0 017 Approximately 80 C 176 F Available Valve Lifter Thickness mm in Identification mark Stamp Thickness of Revision July 2007 valve lifter KBIA0119E 3 00 0 1181 300 3 02 0 1189 302 3 04 0 1197 304 3 06 0 1205 306 3 08 0 1213 308 3 10 0 1220 310 3 12 0 1228 312 3 14 0 1236 314 3 16 0 1244 316 3 18 0 1252 318 3 20 0 1260 320 3 22 0 1268 322 3 24 0 1276 324 3 26 0 1283 326 3 28 0 1291 328 3 30 0 1299 330 3 32 0 1307 332 3 34 0 1315 334 3 36 0 1323 336 3 38 0 1331 338 3 40 0 1339 340 3 42 0 1346 342 EM 105 2008 Sentra SERVICE DATA AND SPECIFICATIONS SDS lt SERVICE INFORMATION gt Thickness mm in MR20DE Identification mark 3 44 0 1354 344 3 46 0 1362 346 3 48 0 1370
29. 9 5 mm 0 374 in dia b 5 5 mm 0 217 in dia Valve guide reamer Qa S NT016 1 Reaming valve guide inner hole 2 Reaming hole for oversize valve guide Intake amp Exhaust d1 6 0 mm 0 236 in dia d2 10 2 mm 0 402 in dia J 43897 18 J 43897 12 Oxygen sensor thread cleaner AEM488 Reconditioning the exhaust system threads before installing a new heated oxygen sensor Use with anti seize lubricant shown below a J 43897 18 18 mm 0 71 in dia for zir conia heated oxygen sensor b J 43897 12 12 mm 0 47 in dia for tita nia heated oxygen sensor Anti seize lubricant Permatex 133AR or equivalent meeting MIL specifica tion MIL A 907 AEM489 Lubricating oxygen sensor thread cleaning tool when reconditioning exhaust system threads Power tool PBICO190E Revision July 2007 EM 120 Loosening bolts and nuts 2008 Sentra PREPARATION lt SERVICE INFORMATION gt QR25DE Tool number Description Kent Moore No Tool name TP55 Torx plus Bit Removing and installing M T flywheel bolts ew EM LBIA0284E E20 Torx Socket Removing and installing CVT drive plate bolts J 45816 LBIAO285E Revision July 2007 EM 121 2008 Sentra NOISE VIBRATION AND HARSHNESS NVH TROUBLESHOOTING lt SERVICE INFORMATION gt QR25DE NOISE VIBRATION AND HARSHNESS NVH TROUBLESHOOTING NVH Troubleshooting Engine Noise INFOID 0000000001849623 i F Cams
30. 969 44 968 1 7704 1 7704 44 968 44 967 1 7704 1 7704 3 44 967 44 966 44 966 44 965 1 7704 1 770 1 7703 1 7703 44 965 44 964 1 7703 1 7702 44 964 44 963 1 7702 1 7702 2 44 963 44 962 1 7702 1 7701 44 962 44 961 1 7702 1 770 1 1 44 961 44 960 1 7701 1 770 44 960 44 959 1 7701 1 7700 44 959 44 958 1 7700 1 7700 44 958 44 957 44 956 1 7700 1 7699 23 23 3 Connecting Rod Bearing Grade Table 44 957 1 7700 1 7700 23 34 34 4 4 4 4 QR25DE WBIA0838E Unit mm in Grade number 0 1 2 3 4 Thickness 1 496 1 493 1 499 1 496 1 502 1 499 1 505 1 502 1 508 1 505 0 0589 0 0588 0 0590 0 0589 0 0591 0 0590 0 0593 0 0591 0 0594 0 0593 Identification color Black Brown Green Yellow Blue Undersize Bearing Usage Guide e When the specified oil clearance is not obtained with standard size connecting rod bearing use undersize US bearing e When using undersize bearing measure the bearing inner diameter with bearing installed and grind the crankshaft pin so that the oil clearance satisfies the standard Bearing Undersize Table Size U S Thickness Fillet R 1 5 1 7 mm 0 059 0 067 in Unit mm in 0 25 0 0098 CAUTION In grinding the crankshaft pin to use undersize bearings do not 1 622 1 6
31. 973 44 972 44 972 44 971 44 971 44 970 44 970 44 969 44 969 44 968 44 968 44 967 44 967 44 966 44 966 44 965 44 965 44 964 44 964 44 963 44 963 44 962 44 962 44 961 44 961 44 960 44 960 44 959 44 959 44 958 44 958 44 957 44 957 44 956 7706 1 7706 7706 1 7705 7705 1 7705 7705 1 7705 7705 1 7704 7704 1 7704 7704 1 7704 7704 1 7703 7703 1 7703 7703 1 7702 7702 1 7702 7702 1 7702 7702 1 7701 7701 1 7701 7701 1 7700 7700 1 7700 7700 1 7700 7700 1 7699 2008 Sentra SERVICE DATA AND SPECIFICATIONS SDS lt SERVICE INFORMATION gt QR25DE Grade No A 54 979 54 978 2 1645 2 1645 Grade No B 54 978 54 977 2 1645 2 1644 Grade No C 54 977 54 976 2 1644 2 1644 Grade No D 54 976 54 975 2 1644 2 1644 Grade No E 54 975 54 974 2 1644 2 1643 Grade No F 54 974 54 973 2 1643 2 1643 Grade No G 54 973 54 972 2 1643 2 1642 Grade No H 54 972 54 971 2 1642 2 1642 Grade No J 54 971 54 970 2 1642 2 1642 Grade No K 54 970 54 969 2 1642 2 1641 Grade No L 54 969 54 968 2 1641 2 1641 Main journal dia Dm grade Grade No M 54 968 54 967 2 1641 2 1641 l P Grade No N 54 967 54 966 2 1641 2 1640 Grade No P 54 966 54 965 2 1640 2 1640 Grade No R 54 965 54 964
32. After removing the bolts separate the mating surface and remove the sealant using Tool PSO 6 3 Tool number KV10111100 J 37228 RR L Tal e Slide 1 the Tool by tapping 2 its side with a hammer to wl f remove the lower oil pan from the upper oil pan CAUTION a yes D D slide Tap Be careful not to damage the mating surfaces WBIAOS66E 10 Remove O ring between cylinder block and oil pan upper INSPECTION AFTER REMOVAL Oil Filter Clean oil strainer portion part of the oil pump if any object attached INSTALLATION 1 Use a scraper A to remove old liquid gasket from mating sur faces e Remove the old liquid gasket from mating surface of cylinder block e Remove old liquid gasket from the bolt holes and threads CAUTION Never scratch or damage the mating surfaces when clean ing off old liquid gasket PBIC3949E 2 Apply the sealant without breaks to the specified location using Tool Use Genuine Silicone RTV Sealant or equivalent Refer to GI 42 Recommended Chemical Product and Sealant Tool number WS39930000 1 Oil pan upper A 2 mm protruded to outside B 2 mm protruded to rear oil seal mounting side lt Engine front 4 Engine outside CAUTION Apply liquid gasket to outside of bolt hole for the positions 5 5 7 5 mm shown by 4 marks 0 217 0 295 in 4 0 5 0 mm 0 157 0 197 in PBIC4587E 3 Install new O ring at cylinder block side CAUTION Inst
33. CAMSHAFT for the specified torque sequence Exhaust side Engine front SBIAO255E e Using inside micrometer measure inner diameter of camshaft bracket Standard 28 000 28 021 mm 1 1024 1 1032 in No 1 Standard 23 500 23 521 mm 0 9252 0 9260 in No 2 3 4 5 PBICOO41E Calculation of Camshaft Journal Clearance e Journal clearance inner diameter of camshaft bracket outer diameter of camshaft journal Standard 0 045 0 086 mm 0 0018 0 0034 in e When out of the specified range above replace either or both the camshaft and the cylinder head assembly NOTE Inner diameter of the camshaft bracket is manufactured together with the cylinder head If the camshaft bracket is out of specification replace the whole cylinder head assembly Revision July 2007 EM 148 2008 Sentra CAMSHAFT lt SERVICE INFORMATION gt LRRD Camshaft End Play 1 Install a dial gauge in the thrust direction on the front end of the camshaft Measure the end play with the dial gauge while mov ing the camshaft forward and backward in direction to axis Standard end 0 115 0 188 mm 0 0045 0 0074 in play 2 If out of the specified range replace with new camshaft and measure again 3 If out of the specified range again replace with new cylinder head assembly PBIC0042E Camshaft Sprocket Runout 1 Install the camshaft in the cylinder head 2 Install the camshaft sprocket on the camshaft 3 Measure
34. Component e Ground cable between engine bracket RH and radiator core support 5 Support the bottom surface of engine using a transmission jack and then remove the engine bracket and insulator RH Refer to EM 99 6 Set No 1 cylinder at TDC on its compression stroke with the following procedure Rotate crankshaft pulley 1 clockwise and align TDC mark no paint B to timing indicator A on front cover C White paint mark Not use for service PBIC3960E b Atthe same time make sure that the cam noses of the No 1 cyl inder are located as shown 1 Camshaft INT 2 Camshaft EXH lt Engine front e If not rotate crankshaft pulley one revolution 360 degrees and align as shown Revision July 2007 EM 38 2008 Sentra TIMING CHAIN lt SERVIGEINFORMATION gt SS _EMR200 7 Hold crankshaft pulley 1 using suitable tool A loosen crank shaft pulley bolt and locate bolt seating surface at 10 mm 0 39 in from its original position CAUTION Never remove the crankshaft pulley bolt as it will be used as a supporting point for the pulley puller PBIC3961E 8 Attach a pulley puller A in the M6 thread hole on crankshaft pulley 1 and remove crankshaft pulley Tool number KV11103000 PBIC3962E 9 Remove oil pan lower Refer to EM 24 NOTE When crankshaft sprocket oil pump sprocket and other related parts are not removed this step is unnec essary 10 Remove intake valve
35. J 37228 case Seal cutter S NT046 T0501S000 Disassembling and assembling Engine stand assembly 1 ST05011000 a Engine stand 2 ST05012000 Am Base KV10106500 C2 Engine stand shaft KV10115300 Engine sub attachment KV10116200 J 26336 B Valve spring compressor 1 KV10115900 J 26336 20 Disassembling valve mechanism Attachment KV10112100 Tightening bolts for bearing cap cylinder BT 8653 A head etc Angle wrench S NT014 EM 117 Revision July 2007 2008 Sentra PREPARATION S NT603 lt SERVICE INFORMATION gt QR25DE Tool number Description Kent Moore No Tool name KV10107902 Removing valve oil seal J 38959 Valve oil seal puller S NT011 KV10115600 Installing valve oil seal J 38958 Use side A Valve oil seal drift a a 20 0 79 dia d 8 0 31 dia b 13 0 51 dia e 10 7 0 421 dia i 3 Side A SO c 10 3 0 406 dia f 5 0 20 dia i Unit mm in e f EM03470000 J 8037 Piston ring compressor Installing piston assembly into cylinder bore ST16610001 J 23907 Pilot bushing puller S NT045 Removing crankshaft pilot bushing WS39930000 Tube presser S NT052 Pressing the tube of liquid gasket 16441 6N210 J 45488 Quick connector release PBIC0198E Removing fuel tube quick connectors in en gine room Available in SEC 164 of PARTS CATALOG Part No 16441 6N210 KV101
36. Liquid Gasket or equivalent SBIAO259E 4 Tighten camshaft bracket bolts in four steps in the order as shown Intake side Step 1 bolts 9 11 1 96 N m 0 2 kg m 17 in Ib Step 2 bolts 1 8 1 96 N m 0 2 kg m 17 in Ib Step 3 bolts 1 11 5 88 N m 0 6 kg m 52 in Ib Step 4 bolts 1 11 10 4 N m 1 02 kg m 92 in Ib CAUTION After tightening camshaft bracket bolts be sure to wipe off Engine 4 excessive sealant from the parts listed below front SBIA0255E e Mating surface of rocker cover Mating surface of front cover when installed without the front cover Exhaust side Revision July 2007 EM 151 2008 Sentra CAMSHAFT lt SERVICE INFORMATION gt QR25DE 5 Install camshaft sprockets l Mating mark PERE e Install them by lining up the mating marks on each camshaft Peripheral Stamp stamp line sprocket with the ones painted on the timing chain during removal e Before installation of chain tensioner it is possible to re match the marks on timing chain with the ones on each sprocket CAUTION Aligned mating marks could slip Therefore after match 4 7 ing them hold the timing chain in place by hand sprocket Before and after installing chain tensioner check again to N S S Eaten make sure that mating marks have not slipped KBIA0115E 6 Install chain tensioner CAUTION After installation pull the stopper pin off completely and make sure that th
37. O ring If O ring was stretched while it was being attached never insert it quickly into fuel tube Insert O ring straight into fuel tube Never twist it Revision July 2007 EM 35 2008 Sentra FUEL INJECTOR AND FUEL TUBE lt SERVIGEINFORMATION gt EMRE 2 Install fuel injector 4 to fuel tube 1 with the following proce dure 3 O ring black 5 O ring green a Insert clip 2 into clip groove F on fuel injector e Insert clip so that protrusion G of fuel injector matches cut out D of clip CAUTION Never reuse clip Replace it with a new one Be careful to keep clip from interfering with O ring If interference occurs replace O ring b Insert fuel injector into fuel tube with clip attached e Insert it while matching it to the axial center e Insert fuel injector so that protrusion B of fuel tube matches cut out C of clip e Make sure that fuel tube flange A is securely fixed in flange fixing groove E on clip c Make sure that installation is complete by making sure that fuel injector does not rotate or come off PBIC3155J 3 Set fuel tube and fuel injector assembly at its position for installation on cylinder head CAUTION For installation be careful not to interfere with fuel injector nozzle 4 Tighten bolts in numerical order as shown lt Engine front PBIC3154J 5 Installation of the remaining components is in the reverse order of removal Revision July 2007 EM 36
38. _EMR200 e Using a piston ring compressor SST EM03470000 J 8037 A or suitable tool install piston with the front mark on the pis ton head facing the front of the engine CAUTION Be careful not to damage the cylinder wall and crankshaft pin resulting from an interference of the connecting rod big end PBIC3244J 22 Install connecting rod cap e Match the stamped cylinder number marks C on connecting rod with those on connecting rod cap to install Front mark piston Oil hole Big end diameter grade Small end diameter grade 71 Mm OW gt Front mark connecting rod bearing cap PBIC3587J 23 Tighten connecting rod bolt with the following procedure CAUTION Make sure that there is no gap in the thrust surface A of the joint between connecting rod 1 and connecting rod bearing cap 2 and that these parts are in the correct position And then tighten the connecting rod bolts If the connecting rod bolts are reused measure the outer diameter Refer to EM 88 Inspection After Disassembly 24 Apply new engine oil to the threads and seats of connecting rod bolts 25 Tighten bolts in three steps Step 1 27 4 N m 2 8 kg m 20 ft lb Step 2 0 N m 0 kg m 0 ft Ib Step 3 19 6 N m 2 0 kg m 14 ft lb e After tightening connecting rod bolt make sure that crankshaft rotates smoothly e Check the connecting rod side clearance Refer to EM 88 Inspection After Disassembly
39. apply only to grade 0 Unit mm in Grade 0 1 Connecting rod small end 20 000 20 006 20 006 20 012 inner diameter 0 7874 0 7876 0 7876 0 7879 Piston pin outer diameter 19 989 19 995 19 995 20 001 0 7870 0 7872 0 7872 0 7874 Fision bik bare diameter 19 993 19 999 19 999 20 005 P 0 7871 0 7874 0 7874 0 7876 CYLINDER BLOCK DISTORTION e Using a scraper remove gasket on the cylinder block surface and also remove oil scale carbon or other contamination CAUTION Be careful not to allow gasket debris to enter the oil or coolant passages Measure the distortion on the block upper face at some different points in 6 directions Limit 0 1 mm 0 004 in e If out of the distortion limit replace the cylinder block INNER DIAMETER OF MAIN BEARING HOUSING Install the main bearing caps with the main bearings removed and tighten the bolts to the specified torque Refer to EM 180 Disas sembly and Assembly Using a bore gauge measure the inner diameter of the main bear ing housing Standard 58 944 58 968 mm 2 3206 2 3216 in If out of the standard replace the cylinder block and lower cylinder block assembly NOTE These components cannot be replaced as a single unit because they were processed together PISTON TO CYLINDER BORE CLEARANCE Inner Diameter of Cylinder Bore Revision July 2007 EM 198 QR25DE Oil splash Big end diameter grade Small end
40. bearings 2 to connecting rod 3 and con necting rod bearing cap 1 and tighten connecting rod bolts to the specified torque Refer to EM 72 Disassembly and Assembly for tightening procedure A Example B Inner diameter measuring direction Measure the inner diameter of connecting rod bearing with an inside micrometer Bearing oil clearance Connecting rod bearing inner diameter Crankshaft pin journal diameter PBIC3275J Standard 0 037 0 047 mm 0 0015 0 0019 in Limit 0 07 mm 0 0028 in If clearance exceeds the limit select proper connecting rod bearing according to connecting rod big end diameter and crankshaft pin journal diameter to obtain specified bearing oil clearance Refer to EM 80 How to Select Piston and Bearing Method of Using Plastigage Remove engine oil and dust on crankshaft pin and the surfaces of each bearing completely Cut a plastigage slightly shorter than the bearing width and place it in crankshaft axial direction avoiding oil holes Install connecting rod bearings to connecting rod and cap and tighten connecting rod bolts to the specified torque Refer to EM 72 Disassembly and Assembly for the tightening procedure CAUTION Never rotate crankshaft Remove connecting rod cap and bearing and using the scale A on the plastigage bag measure the plastigage width NOTE The procedure when the measured value exceeds the limit is same as that described in the Metho
41. camshaft sprocket runout while turning the camshaft by hand Runout Less than 0 15 mm 0 0059 in 4 If it exceeds the specification replace camshaft sprocket KBIAO181J Valve Lifter e Check if the surface of the valve lifter has any excessive wear or cracks replace as necessary KBIA0182E Valve Lifter Clearance Outer Diameter of Valve Lifter Measure the outer diameter of the valve lifter Micrometer Valve lifter out er diameter 33 977 33 987 mm 1 3377 1 3381 in If out of the specified range replace the valve lifter JEM798G Revision July 2007 EM 149 2008 Sentra CAMSHAFT lt SERVICE INFORMATION gt QR25DE Valve Lifter Bore Inner Diameter e Using inside micrometer measure diameter of valve lifter bore of cylinder head Standard 34 000 34 021 mm 1 3386 1 3394 in e If out of the specified range replace the cylinder head assembly PBICO043E Calculation of Valve Lifter Clearance e Valve lifter clearance hole diameter for valve lifter outer diameter of valve lifter Standard 0 020 0 056 mm 0 0008 0 0022 in e If out of specified range replace either or both valve lifter and cylinder head assembly INSTALLATION 1 Install the valve lifter e Install them in the same position from which they were removed 2 Install the camshafts The distinction between the intake and exhaust camshafts is in a difference of shapes of the back end Intake Signal plate
42. diameter grade Cylinder 2 a i gt No o aeons Ay lA code Reference code Bearing stopper groove SBIA0282E WBIAO900E PBICO269E 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt LRRD Using a bore gauge measure cylinder bore for wear out of round and taper at 6 different points on each cylinder X and Y directions i ook at A B and C The Y axis is in the longitudinal direction of the sat engine hoon NOTE i When determining cylinder bore grade measure cylinder bore at B position Refer to EM 204 Standard and Limit If the measured value rebore exceeds the limit or if there are scratches and or seizure on the cylinder inner wall hone the inner wall An oversize piston is provided When using an oversize piston rebore the cylinder so that the clearance of the piston cylinder sat isfies the standard SBIA0284E Over size OS 0 2 mm 0 008 in Outer Diameter of Piston e Measure piston skirt diameter using a micrometer Refer to EM 204 Standard and Limit Micrometer PBIC0125E e Measure point distance from the top 42 mm 1 65 in Piston to Cylinder Bore Clearance e Calculate by outer diameter of piston skirt and inner diameter of cylinder direction X position B Clearance Inner diameter of cylinder Outer diameter of piston skirt Standard 0 010 0 030 mm 0 0004 0 0012 in Limit 0 08 mm 0 0031 in e If it exceeds the limit replace
43. drive belt INSTALLATION Revision July 2007 EM 13 2008 Sentra DRIVE BELTS lt SERVICEINFORMATION gt EMRE 1 Hold the hexagonal part A of drive belt auto tensioner 1 with a box wrench securely Then move the wrench handle in the direction of arrow loosening direction of tensioner CAUTION Never place hand in a location where pinching may occur if the holding tool accidentally comes off 2 Insert a rod such as short length screwdriver approximately 6 mm 0 24 in in diameter into the hole B of retaining boss to fix drive belt auto tensioner 3 Install drive belt CAUTION Confirm drive belt is completely set to pulleys e Check for engine oil working fluid and engine coolant are not adhered to drive belt and each pulley groove 4 Release drive belt auto tensioner and apply tension to drive belt 5 Turn crankshaft pulley clockwise several times to equalize tension between each pulley 6 Confirm tension of drive belt at indicator notch on fixed side is within the possible use range Refer to EM 13 Checking Drive Belts Co m po n e nt INFOID 0000000001849577 SEC 117 9 40 0 4 1 30 0 25 0 2 6 18 0 28 0 2 9 21 a Nem kgm ft Ib PBIC4698E 1 Front cover 2 Drive belt auto tensioner 3 Idler pulley models without A C 4 Bracket models without A C 5 Shaft models without A C Removal and Installation of Drive Belt Auto Tensioner INFOID 0000000001849578 REMOVAL
44. engine under cover using power tool 3 Remove the rocker cover using power tool Refer to EM 143 Removal and Installation 4 Turn crankshaft pulley in normal direction clockwise when PZA viewed from front to align TDC identification mark without paint DA iming indicator 14 mark with timing indicator TDO mark M i o M A SM KBIA0190E 5 Atthis time check that the both intake and exhaust cam lobes of No 1 cylinder face outside e If they do not face outside turn crankshaft pulley once more KBIA0400J Revision July 2007 EM 153 2008 Sentra CAMSHAFT lt SERVICE INFORMATION gt QR25DE 6 By referring to the figure locations indicated with black arrow nie Guineas measure valve clearances with a feeler gauge at locations ac Intake Side marked X as shown in the table below e No 1 cylinder compression TDC Cylinder No 1 No 2 No 3 No 4 Valve INT EXH INT EXH INT EXH INT EXH Measurable x x x x Engine Exhaust Side KBIA0248E e Use a feeler gauge to measure the clearance between valve Camshaft and camshaft Valve clearance standard Cold Intake 0 24 0 32 mm 0 009 0 013 in Exhaust 0 26 0 34 mm 0 010 0 013 in Hot Intake 0 304 0 416 mm 0 012 0 016 in Exhaust 0 308 0 432 mm 0 013 0 017 in Reference data at approximately 80 C 176 F CAUTION KBIA0185E If inspection was carried out with cold engine check th
45. follow the Piston to Cylinder Bore Clearance procedure NOTE e Piston is available together with piston pin as assembly e Piston pin piston pin hole grade is provided only for the parts installed at the plant For service parts no grades can be selected Only grade 0 is available PISTON RING SIDE CLEARANCE Revision July 2007 EM 89 2008 Sentra CYLINDER BLOCK lt SERVIGEINFORMATION gt ST _EMR200 e Measure the side clearance of piston ring and piston ring groove with a feeler gauge A Standard Top ring 0 04 0 08 mm 0 002 0 003 in 2ndring 0 03 0 07 mm 0 001 0 003 in Oil ring 0 015 0 185 mm 0 001 0 007 in Limit Topring 0 11 mm 0 0043 in 2nd ring 0 10 mm 0 0039 in e If the measured value exceeds the limit replace piston ring and measure again If it still exceeds the limit replace piston also PISTON RING END GAP e Make sure that cylinder bore inner diameter is within specification Follow the Cylinder Bore Inner Diameter procedure e Lubricate with new engine oil to piston 1 and piston ring 2 and then insert A piston ring until middle of cylinder B with piston and measure piston ring end gap with a feeler gauge C Standard Top ring 0 20 0 30 mm 0 008 0 012 in 2nd ring 0 50 0 65 mm 0 020 0 026 in Oil ring 0 15 0 45 mm 0 006 0 018 in rail ring PBIC3267J Limit Top ring 0 51 mm 0 020 in 2nd ring 0 83 mm 0 033 i
46. inside and outside diagonally in this order If the order of tightening is specified do exactly as specified Replace with new gasket packing oil seal or O ring Thoroughly wash clean and air blow each part Carefully check oil or coolant passages for any restriction and blockage Avoid damaging sliding or mating surfaces Completely remove foreign materials such as cloth lint or dust Before assembly oil sliding surfaces well Release air within route after draining coolant Before starting engine apply fuel pressure to fuel lines with turning ignition switch ON with engine stopped Then make sure that there are no leaks at fuel line connections After repairing start engine and increase engine speed to check coolant fuel oil and exhaust systems for leakage Parts Requiring Angular Tightening INFOID 0000000001849567 e Use an angle wrench for the final tightening of the following engine parts Cylinder head bolts Camshaft sprocket INT Main bearing cap bolts Connecting rod cap nuts Crankshaft pulley bolt No angle wrench is required as the bolt flange is provided with notches for angular tightening Revision July 2007 EM 4 2008 Sentra PRECAUTIONS lt SERVIGEINFORMATION gt ooo EMIR2007 Tool number KV10112100 BT 8653 A e Do not use a torque value for final tightening e The torque value for these parts are for a preliminary step e Ensure thread and seat surfaces are clean and coated with engine oil
47. necessary for easier installation 6 Remove air cleaner case with the following procedure a Remove battery Refer to SC 4 b Disconnect harness connector from mass air flow sensor c Remove the air cleaner case 7 Remove the mass air flow sensor from the air cleaner case if necessary CAUTION Handle it carefully and avoid impacts Do not touch sensor part INSTALLATION Installation is in the reverse order of removal e Align marks Revision July 2007 EM 16 2008 Sentra AIR CLEANER AND AIR DUCT lt SERVIGEINFORMATION gt ooo EMR2007 e Attach each joint securely e Screw clamps firmly Changing Air Cleaner Filter INFOID 0000000001849581 REMOVAL 1 Unclip the tabs A of both ends of the air cleaner cover 1 WBIA0824E 2 Remove the air cleaner filter and holder assembly from the air cleaner case 3 Remove the air cleaner filter from the holder INSPECTION AFTER REMOVAL It is necessary to replace it at the recommended intervals more often under dusty driving conditions Refer to MA 7 INSTALLATION Installation is in the reverse order of removal Revision July 2007 EM 17 2008 Sentra INTAKE MANIFOLD lt SERVICEINFORMATION gt ooo IMR20E INTAKE MANIFOLD Co m po n e nt INFOID 0000000001849582 SEC 118 140 163 211 223 iQ 10 0 1 0 89 Ee De P 19 6 2 0 XN 27 0 2 8 20 WBIA0771E PCV hose 2 Gasket 3 Intake manifold Bracket 5 O ring 6 EVAP cani
48. number Thickness Identification color Remarks UPR 1 996 1 999 0 0786 0 0787 Black j LWR 1 999 2 002 0 0787 0 0788 Brown UPR 1 999 2 002 0 0787 0 0788 Brown 5 LWR 2 002 2 005 0 0788 0 0789 Green UPR 2 002 2 005 0 0788 0 0789 Green LWR 2 005 2 008 0 0789 0 0791 Yellow UPR 2 005 2 008 0 0789 0 0791 Yellow Grade and color are different 34 between upper and lower bear LWR 2 008 2 011 0 0791 0 0792 Blue ings UPR 2 008 2 011 0 0791 0 0792 Blue ui LWR 2 011 2 014 0 0792 0 0793 Pink UPR 2 011 2 014 0 0792 0 0793 Pink a LWR 2 014 2 017 0 0793 0 0794 Purple i UPR 2 014 2 017 0 0793 0 0794 Purple LWR 2 017 2 020 0 0794 0 0795 White Use Undersize Bearing Usage Guide e When the specified main bearing oil clearance is not obtained with standard size main bearings use under size US bearing e When using undersize US bearing measure the main bearing inner diameter with bearing installed and grind main journal so that the main bearing oil clearance satisfies the standard CAUTION In grinding crankshaft main journal to use undersize bearings keep the fillet R 1 5 1 7 mm 0 059 0 067 in A PBIC3263J Bearing undersize table Unit mm in Size Thickness US 0 25 0 0098 2 126 2 134 0 0837 0 0840 Inspection After Disassembly INFOID 0000000001849609 CRANKSHAFT END PLAY e Measure the clearance between thrust bearing
49. oil holes and the cylinder No on the connecting rod are posi Front mark tioned as shown c Install the piston pin snap ring into the front of the piston e Check that the connecting rod moves smoothly Cylinder No PBICOO99E 10 Using a piston ring expander install the piston rings Assemble the components in their original positions CAUTION Be careful not to damage the piston e Position each ring with the gap as shown referencing the pis ton front mark as the starting point e Install the top ring and the second ring with the stamped sur face facing upward Stamped mark 1K top ring 2K second ring WBIA0900E 11 Install the connecting rod bearings to the connecting rod and the connecting rod cap Assemble the components in their original positions Protrusion e When installing the connecting rod bearings apply engine oil FB to the bearing friction surface inside Do not apply oil to the Q SE back surface but thoroughly clean the back e When installing align the connecting rod bearing stopper pro trusion with the notch of the connecting rod to install e Check the oil holes on the connecting rod and those on the corresponding bearing are aligned Cutout PBICO266E 12 Install the piston and connecting rod assembly to the crankshaft Assemble the components in their origi nal positions Revision July 2007 EM 186 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt RSD Tool numbe
50. piston piston pin assembly Reboring Cylinder Bore 1 Cylinder bore size is determined by adding piston to bore clearance to piston diameter A Rebored size calculation D A B C D Bored diameter A Piston diameter as measured B Piston to bore clearance standard value C Honing allowance 0 02 mm 0 0008 in 2 Install main bearing caps and tighten to the specified torque Otherwise cylinder bores may be distorted in final assembly 3 Cut cylinder bores When any cylinder needs boring all other cylinders must also be bored Do not cut too much out of cylinder bore at a time Cut only 0 05 mm 0 0020 in or so in diameter at a time 4 Hone cylinders to obtain specified piston to bore clearance 5 Measure finished cylinder bore for out of round and taper Revision July 2007 EM 199 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt Measurement should be done after cylinder bore cools down OUTER DIAMETER OF CRANKSHAFT JOURNAL e Measure outer diameter of crankshaft journals Standard 54 955 54 979 mm 2 1636 2 1645 in OUTER DIAMETER OF CRANKSHAFT PIN e Measure outer diameter of crankshaft pin Standard 44 956 44 974 mm 1 7699 1 7706 in OUT OF ROUND AND TAPER OF CRANKSHAFT e Measure the dimensions at four different points as shown on each journal and pin using a micrometer e Out of round is indicated by the difference in dimensions between X and Y at A and B e Taper is i
51. point of conic angles a1 and a2 2 Diameter made by intersection point of conic angles a2 and a3 3 Machining data CAMSHAFT AND CAMSHAFT BEARING Unit mm in Items Standard Limit No 1 0 045 0 086 0 0018 0 0034 Camshaft journal oil clearance 0 15 0 0059 No 2 3 4 5 0 030 0 071 0 0012 0 0028 No 1 28 000 28 021 1 1024 1 1032 Camshaft bracket inner diameter No 2 3 4 5 25 000 25 021 0 9843 0 9851 No 1 27 935 27 955 1 0998 1 1006 Camshaft journal diameter No 2 3 4 5 24 950 24 970 0 9823 0 9381 Camshaft end play 0 075 0 153 0 0030 0 0060 0 24 0 0094 Intake 44 605 44 795 1 7560 1 7635 44 405 1 7482 Camshaft cam height A Exhaust 43 175 43 365 1 6997 1 7072 42 975 1 6919 Revision July 2007 EM 107 2008 Sentra SERVICE DATA AND SPECIFICATIONS SDS lt SERVICE INFORMATION gt Camshaft runout TIR Less than 0 02 mm 0 0008 MR20DE 0 05 0 0020 Camshaft sprocket runout TIR 0 15 0 0059 A SEM671 Total indicator reading CYLINDER BLOCK 130 mm 5 12 in PBIC4017E Unit mm in Top surface distortion Limit 0 1 0 004 Grade No 1 84 000 84 010 3 3071 3 3075 Cylinder bore Inner diameter Standard Grade No 2 84 010 84 020 3 3075 3 3079 Out of round Difference b
52. procedure Loosen the bolts in the reverse order as shown and remove them Remove the front cover CAUTION Be careful not to damage the mounting surface If the front oil seal needs to be replaced lift it out with a screw driver to remove it Push in the tensioner plunger Insert a stopper pin into the hole on the tensioner body to hold the chain tensioner e Use a wire of 0 5 mm 0 02 in diameter as a stopper pin Remove the chain tensioner oy Stopper pin KBIAO048E Revision July 2007 EM 158 2008 Sentra TIMING CHAIN lt SERVICE INFORMATION gt Cc 18 19 20 21 22 Secure hexagonal part of the camshaft with a wrench and loosen the camshaft sprocket bolt and remove the camshaft sprocket for both camshafts CAUTION e Do not rotate the crankshaft or camshafts while the timing chain is removed It can cause damage to the valve and piston QR25DE Remove the chain slack guide tension guide timing chain and oil pump drive spacer Press stopper tab A in the direction shown to push the timing chain slack guide B toward timing chain tensioner for balancer unit 1 e The slack guide B is released by pressing the stopper tab A As a result the slack guide B can be moved Insert stopper pin D into tensioner body hole C to secure tim ing chain slack guide B NOTE Use a hard metal pin with a diameter of approximately 1 2 mm 0 047 in as a stopper pin
53. shapes of the front and rear ends of the camshaft or using the identification colors A and B 1 Camshaft EXH 2 Camshaft INT Identification color A B Camshaft EXH Yellow Camshaft INT Yellow PBIC3188J e Install camshafts so that camshaft dowel pins A on the front side are positioned as shown 1 Camshaft EXH 2 Camshaft INT NOTE Though camshaft does not stop at the positions as shown for the placement of cam nose it is generally accepted camshaft is placed for the same direction as shown 3 Remove foreign material completely from camshaft bracket backside and from cylinder head installation face 4 Apply liquid gasket A to camshaft bracket as shown Use Genuine Silicone RTV Sealant or equivalent Refer to GI 42 Recommended Chemical Product and Sealant Tool number WS39930000 B Plug hole inner wall lt Engine front 4m Engine outside 0 157 0 220 in 0 165 0 228 in 3 4 4 4 mm 0 134 0 173 in N 0 134 0 173 in LA PBIC3964E Revision July 2007 EM 51 2008 Sentra CAMSHAFT lt SERVICEINFORMATION gt EMRE 5 Install camshaft bracket bolts in three stage in numerical order as shown in numerical order as shown lt Engine front e There are two types of bolts Use the following to locate bolts M6 bolts thread length 57 5 mm 2 264 in 13 14 and 15 M6 bolts thread length 35 00 mm 1 378 in Except the abov
54. should not continue beyond the bottom face of the seat recess in cylinder head Set the machine depth stop to ensure this Refer to EM 103 Standard and Limit 2 Ream cylinder head 1 recess diameter for service valve seat 2 Valve seat Oversize 0 5 mm 0 020 in Intake 35 200 35 227 mm 1 3858 1 3869 in Exhaust 29 200 29 227 mm 1 1496 1 1507 in e Be sure to ream in circles concentric to the valve guide center This will enable valve seat to fit correctly PBIC3218J 3 Heat cylinder head to 110 to 130 C 230 to 266 F by soaking in heated oil A PBIC3214J 4 Provide valve seats cooled well with dry ice Press fit valve seat into cylinder head CAUTION e Never touch cold valve seats directly e Cylinder head contains heat when working wear protective equipment to avoid getting burned 5 Using valve seat cutter set or valve seat grinder finish valve seat to the specified dimensions For dimensions refer to EM 103 Standard and Limit CAUTION When using valve seat cutter firmly grip the cutter handle with both hands Then press on the contacting surface all around the circumference to cut in a single drive Improper pressure on with the cutter or cutting many different times may result in stage valve seat 6 Using compound grind to adjust valve fitting 7 Check again for normal contact Use the VALVE SEAT CONTACT procedure Revision July 2007 EM 69 2008 Sentra
55. side clearance between connecting rod and crankshaft arm using a feeler gauge Standard 0 20 0 35 mm 0 0079 0 0138 in Limit 0 50 mm 0 0197 in e If the measured value exceeds the limit replace the connecting rod bearings and measure again If it still exceeds the limit replace the crankshaft also PISTON AND PISTON PIN CLEARANCE Diameter of Piston Pin Bore e Measure the diameter of piston pin bore using an inside microme ter Refer to EM 204 Standard and Limit Outer Diameter of Piston Pin e Measure outer diameter of piston pin using a micrometer Refer to EM 204 Standard and Limit Piston to Piston Pin Clearance Piston pin clearance Piston pin bore diameter Outer diameter of piston pin Standard 0 002 0 006 mm 0 0001 0 0002 in e If clearance exceeds specification replace either or both of piston piston pin assembly and connecting rod assembly with reference to specification of each parts e Use the piston selection table to replace piston piston pin assem bly Refer to EM 188 How to Select Piston and Bearing e Use the connecting rod bearing selection table to replace connect ing rod Refer to EM 188 How to Select Piston and Bearing NOTE Revision July 2007 EM 195 QR25DE KBIAO071E PBICO116E PBICO117E WBIAO900E 2008 Sentra CYLINDER BLOCK lt SERVIGEINFORMATION gt TT e The connecting rod small end grade and piston pin hole piston pi
56. tensioner 3 Crankshaft pulley A C compressor models with A C 4 idler pulley models without a c gt Water pump Sy Bie Dell A Possible use range B Range when new drive belt is installed C Indicator Checking Drive Belts INFOID 0000000001849574 WARNING Be sure to perform this step when the engine is stopped e Make sure that the indicator notch on fixed side of drive belt auto tensioner is within the possible use range A NOTE e Check the drive belt auto tensioner indication when the engine is cold e When new drive belt is installed the indicator notch on fixed side should be within the range B e Visually check entire drive belt for wear damage or cracks e If the indicator notch on fixed side is out of the possible use range or belt is damaged replace drive belt Tension Adjustment INFOID 0000000001849575 Belt tension is not necessary as it is automatically adjusted by drive belt auto tensioner Removal and Installation INFOID 0000000001849576 REMOVAL 1 Hold the hexagonal part A of drive belt auto tensioner 1 with a wrench securely Then move the wrench handle in the direc tion of arrow loosening direction of tensioner CAUTION Never place hand in a location where pinching may occur if the holding tool accidentally comes off 2 Insert a rod such as short length screwdriver approximately 6 mm 0 24 in in diameter into the hole B of the retaining boss to fix drive belt auto tensioner 3 Remove
57. the remaining components is in the reverse order of removal Valve Clearance INFO1D 0000000001849596 INSPECTION Perform inspection as follows after removal installation or replacement of camshaft or valve related parts or if there is unusual engine conditions regarding valve clearance 1 2 a Remove rocker cover Refer to EM 30 Measure the valve clearance with the following procedure Set No 1 cylinder at TDC of its compression stroke e Rotate crankshaft pulley 1 clockwise and align TDC mark no paint B to timing indicator A on front cover C White paint mark Not use for service PBIC3960E Revision July 2007 EM 54 2008 Sentra CAMSHAFT lt SERVIGEINFORMATION gt ST _EMR200 At the same time make sure that both intake and exhaust cam noses of No 1 cylinder face inside as shown 1 Camshaft INT 2 Camshaft EXH lt Engine front e If they do not face inside rotate crankshaft pulley once more 360 degrees and align as shown b Use a feeler gauge measure the clearance between valve lifter and camshaft PBIC3192J Valve clearance Unit mm in Cold Hot reference data Intake 0 26 0 34 0 010 0 013 0 304 0 416 0 012 0 016 Exhaust 0 29 0 37 0 011 0 015 0 308 0 432 0 012 0 017 Approximately 80 C 176 F e By referring to the figure measure the valve clearances at locations marked x as shown in the table below locations in
58. timing control solenoid valve 11 Remove drive belt auto tensioner 12 Loosen bolts in reverse order as shown PBIC3164J Revision July 2007 EM 39 2008 Sentra TIMING CHAIN lt SERVIGEINFORMATION gt _EMR200 13 Cut liquid gasket by prying the position shown and then remove the front cover CAUTION Be careful not to damage the mating surface Amore adhesive liquid gasket is applied compared to pre vious types when shipped so it should not be forced off the position not specified PBIC3357J 14 Remove front oil seal from front cover e Lift up front oil seal using a suitable tool CAUTION Be careful not to damage front cover 15 Push in timing chain tensioner plunger 16 Insert a stopper pin A into the body hole to retain the plunger in collapsed position NOTE Use approximately 1 5 mm 0 059 in diameter hard metal pin as a stopper pin 17 Remove timing chain tensioner 1 18 Remove timing chain slack guide 2 timing chain tension guide 3 and timing chain 1 CAUTION Never rotate each crankshaft and camshaft individually while timing chain is removed It causes interference between valve and piston Revision July 2007 EM 40 2008 Sentra TIMING CHAIN lt SERVIGEINFORMATION gt o o o _EMR200 19 Press stopper tab A in the direction shown to push the timing chain slack guide B toward timing chain tensioner for oil pump 1 e The slack guide B is released
59. to damage cylinder head Do not remove spark plug tube if not necessary Once removed the spark plug tube cannot be reused because of deformation ASSEMBLY 1 Install valve guide Refer to EM 172 Inspection After Disassembly 2 Install valve seat Refer to EM 172 Inspection After Disassembly 3 Install new valve oil seal to the specified height as shown using Tool WBIA0478E Oil seal installed height 12 1 mm 0 476 in Tool number KV10115600 J 38958 WBIA0892E 4 Install valve e Install larger diameter to intake side 5 Install valve spring with valve spring seat e Install smaller pitch spring end valve spring seat side to cylin der head side e Confirm the identification color of the valve spring Intake spring identification color Pink a eps Identification color Exhaust spring identification color Blue V 5 alve spring seat PBIC0525E 6 Install valve spring retainer 7 Install valve collet using Tool Tool numbers KV10116200 J 26336 B KV10115900 J 26336 20 e Install valve collet with a magnet hand CAUTION When working be careful not to damage valve lifter holes e Tap valve stem edge lightly with a plastic hammer after instal lation to check its installed condition WBIA0578E 8 Install valve lifter Revision July 2007 EM 171 2008 Sentra CYLINDER HEAD lt SERVICE INFORMATION gt RSE 9 a b Install the spark plug tube if remove
60. using suitable reamer Intake and exhaust 6 000 6 018 mm 0 2362 0 2369 in VALVE SEAT CONTACT NOTE After confirming that the dimensions of valve guides and valves are within specifications perform this procedure e Apply prussian blue or white lead onto contacting surface of valve seat to check the condition of the valve contact on the seat sur face e Check if the contact area band is continuous all around the circum ference e If not grind to adjust valve fitting and check again If the contacting surface still has NG conditions even after the re check replace the valve seat NG SBIA0322E VALVE SEAT REPLACEMENT NOTE When valve seat is removed replace with an oversized 0 5 mm 0 020 in valve seat 1 Bore out old seat until it collapses Boring should not continue beyond the bottom face of the seat recess in the cylinder head Set the machine depth stop to ensure this 2 Ream cylinder head recess diameter for service valve seat Intake 37 000 37 016 mm 1 4567 1 4573 in Regass diameter Exhaust 32 000 32 016 mm 1 2598 1 2605 in e Be sure to ream in circles concentric to the valve guide center This will enable the valve seat to fit correctly SEM795A Revision July 2007 EM 174 2008 Sentra CYLINDER HEAD lt SERVIGE INFORMATION gt o o 3 Heat cylinder head to 110 to 130 C 230 to 266 F by soaking in heated oil SEM008A 4 Use valve seats cooled
61. well with dry ice Force fit valve seat into cylinder head CAUTION Avoid directly touching the cold valve seats 5 Finish the seat to the specified dimensions using suitable tool CAUTION When using valve seat cutter firmly grip the cutter handle with both hands Then press on the contacting surface all around the circumference to cut in a single drive Improper pressure on the cutter or cutting many different times may result in a defective valve seat 6 Using compound grind to adjust valve fitting 7 Check again for normal contact VALVE SPRING SQUARENESS Set try square along the side of the valve spring and rotate the spring Measure the maximum clearance between the top face of the spring and the try square Limit 1 9 mm 0 0748 in Try square PBICOO80E VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD Check valve spring pressure with valve spring seat installed at spec ified spring height Replace if not within specifications CAUTION Do not remove the valve spring seat SEM113 Revision July 2007 EM 175 2008 Sentra lt SERVICE INFORMATION gt Valve Spring Specifications Specifications CYLINDER HEAD Intake QR25DE Exhaust Identification color Pink Green Free height 43 72 43 92 mm 1 7213 1 7291 in 45 29 45 49 mm 1 7831 1 7909 in Installation height 35 30 mm 1 390 in 35 30 mm 1 390 in Installation load 151 175 N 15
62. 00 20 006 0 7874 0 7876 diameter Grade No 1 20 006 20 012 0 7876 0 7879 Revision July 2007 EM 210 2008 Sentra SERVICE DATA AND SPECIFICATIONS SDS lt SERVICE INFORMATION gt Connecting rod big end inner diameter 48 000 48 013 1 8898 1 8903 QR25DE Standard 0 20 0 35 0 0079 0 0138 Side clearance Limit 0 50 0 0197 Grade No 0 48 000 48 001 1 8898 1 8898 Grade No 1 48 001 48 002 1 8898 1 8898 Grade No 2 48 002 48 003 1 8898 1 8899 Grade No 3 48 003 48 004 1 8899 1 8899 Grade No 4 48 004 48 005 1 8899 1 8899 Grade No 5 48 005 48 006 1 8899 1 8900 Connecting rod bearing housing Grade No 6 48 006 48 007 1 8900 1 8900 Grade No 7 48 007 48 008 1 8900 1 8901 Grade No 8 48 008 48 009 1 8901 1 8901 Grade No 9 48 009 48 010 1 8901 1 8902 Grade No A 48 010 48 011 1 8902 1 8902 Grade No B 48 011 48 012 1 8902 1 8902 Grade No C 48 012 48 013 1 8902 1 8903 After installing in connecting rod CRANKSHAFT Out of round o Taper Unit mm in SEM715 Pin journal dia DP Revision July 2007 Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No CHAMODVZAZZHACTOAMAMIVOWS EM 211 44 974 44 973 44
63. 000000001849595 REMOVAL WARNING e Put a CAUTION FLAMMABLE sign in the workshop Be sure to work in a well ventilated area and furnish workshop with a CO2 fire extinguisher Do not smoke while servicing fuel system Keep open flames and sparks away from the work area AN gt Release the fuel pressure Refer to EC 83 Fuel Pressure Check Disconnect negative battery cable Refer to SC 6 Removal and Installation MR20DE Remove front RH wheel Refer to WT 6 Remove front fender protector RH Refer to El 20 Drain engine coolant Refer to CO 11 NOTE Perform this step when engine is cold Remove the following parts e Intake manifold Refer to EM 18 e Rocker cover Refer to EM 30 Revision July 2007 EM 46 2008 Sentra CAMSHAFT lt SERVICE INFORMATION gt 10 Loosen bolts in reverse order as shown 11 e Fuel tube and fuel injector assembly Refer to EM 33 e Front cover timing chain and related parts Refer to EM 37 Remove camshaft position sensor PHASE from camshaft bracket CAUTION e Handle carefully to avoid dropping and shocks e Never disassemble Never allow metal powder to adhere to magnetic part at sensor tip Never place sensor in a location where it is exposed to magnetism Put the matching mark A on the camshaft sprocket INT 2 and the camshaft bracket 1 as shown lt Engine front NOTE It prevents the knock pin of the camshaft INT from en
64. 067 Piston height H dimension 39 9 1 571 Piston pin hole diameter 19 993 19 999 0 7871 0 7874 Pistia te cylinder bere cloatanse Standard 0 020 0 040 0 0008 0 0016 Limit 0 08 0 0031 Piston Ring Unit mm in Items Standard Limit Top 0 04 0 08 0 002 0 003 0 11 0 0043 Side clearance 2nd 0 03 0 07 0 001 0 003 0 10 0 0039 Oil ring 0 015 0 185 0 001 0 007 Top 0 20 0 30 0 008 0 012 0 51 0 020 End gap 2nd 0 50 0 65 0 020 0 026 0 83 0 033 Oil rail ring 0 15 0 45 0 006 0 018 0 78 0 031 Piston Pin Unit mm in Items Standard Limit Piston pin outer diameter 19 989 19 995 0 7870 0 7872 Piston to piston pin oil clearance 0 002 0 006 0 0001 0 0002 Connecting rod bushing oil clearance 0 005 0 023 0 0002 0 0009 0 03 0 0012 CONNECTING ROD Unit mm in Center distance 143 44 143 54 5 647 5 650 Bend per 100 3 94 Limit 0 15 0 0059 Torsion per 100 3 94 Limit 0 30 0 0118 Connecting rod bushing inner diameter Revision July 2007 EM 109 20 000 20 012 0 7874 0 7879 2008 Sentra SERVICE DATA AND SPECIFICATIONS SDS lt SERVICE INFORMATION gt MR20DE Standard 0 20 0 35 0 0079 0 0138 Side clearance Limit 0 40 0 0157 Grade No A 47 000 47 001 1 8504 1 8504 Grade No B 47 001 47 002 1 8504 1 8505 Grade No C 47 002 47 003 1 8505 1 8505 Grade No
65. 0DE 7 Use a scraper A to remove old liquid gasket from mating sur faces e Also remove old liquid gasket from mating surface of oil pan upper e Remove old liquid gasket from the bolt holes and threads PBIC3953E 8 Apply the sealant without breaks to the specified location using Tool Use Genuine Silicone RTV Sealant or equivalent Refer to GI 42 Recommended Chemical Product and Sealant Tool number WS39930000 1 Oil pan lower Engine outside 0 295 0 374 in 4 0 5 0 mm 0 157 0 197 in PBIC4590E 9 Tighten bolts in numerical order as shown lt Engine front 10 Install oil filter with the following procedure a Remove foreign materials adhering to the oil filter installation surface b Apply new engine oil to the oil seal contact surface of new oil fil ter c Screw oil filter manually until it touches the installation surface then tighten it by 2 3 turn Or tighten to specification Oil filter 17 7 N m 1 8 kg m 13 ft lb 2 3 of a turn SMA229B Revision July 2007 EM 28 2008 Sentra OIL PAN lt SERVICE INFORMATION gt MR20DE 11 Installation of the remaining components is in the reverse order of removal Revision July 2007 EM 29 2008 Sentra IGNITION COIL SPARK PLUG AND ROCKER COVER lt SERVICE INFORMATION gt MR20DE IGNITION COIL SPARK PLUG AND ROCKER COVER Co m po n e nt INFOID 0000000001849588 SEC 111 118 220 gor fy 7 0 0 71 62
66. 1 51 962 2 0457 2 0457 51 960 51 961 2 0457 2 0457 51 959 51 960 2 0456 2 0457 MAIN BEARING Unit mm in Grade number Thickness Identification color Remarks 0 1 996 1 999 0 0786 0 0787 Black 1 1 999 2 002 0 0787 0 0788 Brown 2 2 002 2 005 0 0788 0 0789 Green 3 2 005 2 008 0 0789 0 0791 Yellow Grade and color are the same 4 2 008 2 011 0 0791 0 0792 Blue for upper and lower bearings 5 2 011 2 014 0 0792 0 0793 Pink 6 2 014 2 017 0 0793 0 0794 Purple 7 2 017 2 020 0 0794 0 0795 White Revision July 2007 EM 111 2008 Sentra SERVICE DATA AND SPECIFICATIONS SDS lt SERVICE INFORMATION gt MR20DE gL UPR 1 996 1 999 0 0786 0 0787 Black LWR 1 999 2 002 0 0787 0 0788 Brown is UPR 1 999 2 002 0 0787 0 0788 Brown LWR 2 002 2 005 0 0788 0 0789 Green 23 UPR 2 002 2 005 0 0788 0 0789 Green LWR 2 005 2 008 0 0789 0 0791 Yellow UPR 2 005 2 008 0 0789 0 0791 Yellow Grade and color are different 34 between upper and lower bear LWR 2 008 2 011 0 0791 0 0792 Blue ings jk UPR 2 008 2 011 0 0791 0 0792 Blue LWR 2 011 2 014 0 0792 0 0793 Pink UPR 2 011 2 014 0 0792 0 0793 Pink ai LWR 2 014 2 017 0 0793 0 0794 Purple UPR 2 014 2 017 0 0793 0 0794 Purple LWR 2 017 2 020 0 0794 0 0795 White Undersize Unit m
67. 1 56 012 2 2052 2 2052 56 012 56 013 2 2052 2 2052 56 016 56 017 2 2053 2 2054 wD gt 51 978 51 979 2 0464 2 0464 a t fa N ai fa N N x o Q Ke ro 3 is Ke w 0 fa o al fa A N x is e D Ke lro r N S is Ke w 0 o1fot 1 56 007 56 008 2 2050 2 2050 N N a N N o 1 1 ojo 51 977 51 978 2 0463 2 0464 51 976 51 977 2 0463 2 0463 51 975 51 976 2 0463 2 0463 o o jo 55 997 55 998 2 2046 2 2046 ojojo 55 998 55 999 2 2046 2 2047 51 974 51 975 2 0462 2 0463 o o o 56 000 o ojo j 56 001 56 002 2 2048 2 2048 01 files 51 973 51 974 2 0462 2 0462 01 IJO nj m 51 972 51 973 2 0461 2 0462 51 971 51 972 2 0461 2 0461 51 970 51 971 2 0461 2 0461 ojojo ra a erg ofa a foal raf 1412 hf ehehe i i hehehe a 2 2 f2sf23l2s s 34 34 z 34 Ale 51 969 51 970 2 0460 2 0461 Ie el o FIle IE gt ele ss 00 112 12 12 12 2 23 12 2 2 2 23 23 ARB wlole SIRIS N 56 015 56 016 2 2053 2 2053 MI jo glelolelslg z v n v 56 013 56 014 2 2052 2 2053 2 elefe o g Z m 58 014 56 015 2 2053 2 2053 23 23 3 34 34 34 23 3434 34 4 23 34 34 4 4 TIZI 51 968 51 969 2 0460
68. 1 Measured valve clearance C2 Standard valve clearance e Thickness of a new valve lifter can be identified by stamp marks on the reverse side inside the cylinder Stamp mark 696 indicates a thickness of 6 96 mm 0 2740 in Available thickness of valve lifter 26 sizes with a range of 6 96 to 7 46 mm 0 2740 to 0 2937 in in steps of 0 02 mm 0 0008 in when assembled at the factory Install the selected valve lifter Install camshaft Manually turn crankshaft pulley a few turns Check that valve clearances for cold engine are within specifica tions by referring to the specified values QR25DE KBIAO057E Thickness of valve lifter KBIA0119E After completing the repair check valve clearances again with the specifications for warmed engine Use a feeler gauge to measure the clearance between the valve and camshaft Make sure the values are within specifications Valve clearance standard Cold Intake 0 24 0 32 mm 0 009 0 013 in Exhaust 0 26 0 34 mm 0 010 0 013 in Hot Intake 0 304 0 416 mm 0 012 0 016 in Exhaust 0 308 0 432 mm 0 013 0 017 in Reference data at approximately 80 C 176 F Revision July 2007 EM 155 2008 Sentra lt SERVICE INFORMATION gt TIMING CHAIN Removal and Installation 10 13 16 19 A SEC 110 112 120 130 135 A 0 102 9 10 76 E 2 142 14 105 0 12 5 1 3 9 wg 6 4 0 65 57 Oil rings Chain tension
69. 14400 J 38365 Heated oxygen sensor wrench Revision July 2007 FS NT636 EM 118 Loosening or tightening rear heated oxygen sensor a 22 mm 0 87 in 2008 Sentra lt SERVICE INFORMATION gt Tool number Kent Moore No Tool name PREPARATION QR25DE Description KV10117100 J 36471 A Heated oxygen sensor wrench Loosening or tightening heated oxygen sen sor EM For 22 mm 0 87 in hexagon nut J 44626 Air fuel ratio A F sensor wrench LEM054 Loosening or tightening air fuel ratio A F sensor 1 J 46535 Drive belt tension releaser Commercial Service Tool 6 WBIA0S36E Releasing drive belt tension INFOID 000000000 1849622 Tool number Description Kent Moore No Tool name Pulley holder Crankshaft pulley removing and installing a 68 mm 2 68 in dia S z b 8 mm 0 31 in dia o b NT628 Crank puller Crankshaft pulley removing jets Spark plug wrench Revision July 2007 ZZA0010D 14mm 0 55 in PBIC2982E EM 119 Removing and installing spark plug 2008 Sentra PREPARATION lt SERVICE INFORMATION gt Tool number Kent Moore No Tool name QR25DE Description Valve seat cutter set S NT048 Finishing valve seat dimensions Piston ring expander S NT030 Removing and installing piston ring Valve guide drift p S NT015 Removing and installing valve guide Intake amp Exhaust a
70. 2 3 17 014 7 1 5 11 FJ 0 108 11 80 WBIA0773E 1 Cylinder block 2 O ring 3 Crankshaft position sensor POS 4 are sensor POS 5 cated for intake valve timing con e Acadebiscisor Revision July 2007 EM 71 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt MR20DE 7 Oil pressure switch 8 Top ring 9 Second ring 10 Oil ring 11 Snap ring 12 Piston 13 Piston pin 14 Connecting rod 15 Thrust bearing 16 Connecting rod bearing upper 17 Main bearing upper 18 Crankshaft key 19 Main bearing lower 20 Connecting rod bearing lower 21 Connecting rod bearing cap 22 Connecting rod bolt 23 Main bearing cap 24 Main bearing cap bolt 25 Crankshaft 26 Pilot converter CVT models 27 Signal plate 28 Rear oil seal 29 Drive plate CVT models 30 Reinforcement plate CVT models 31 Flywheel M T models 32 Block heater Canada only A Refer to EM 72 Disassembly and Assembly inFo10 0000000001848607 DISASSEMBLY 1 2 a oo pw Remove engine and transaxle assembly from vehicle separate transaxle from engine Refer to EM 99 Install engine to engine stand as follows Remove flywheel M T models or drive plate 1 CVT models e Secure flywheel M T models or drive plate CVT models using Tool A and remove bolts Tool number KV 11105210 J 44716 CAUTION Be careful not to damage or scratch drive plate CVT mod els and contact surface for clutch disc of flywheel M T models NOTE
71. 2008 Sentra TIMING CHAIN lt SERVICEINFORMATION gt MRE TIMING CHAIN Component INFOID 000000000 1849592 SEC 112 120 130 135 a 9 25 0 2 6 18 w Oe Se 10 0 1 0 89 Wl ee 0 40 0 4 1 30 R Nem kg m in Ib O Nem kg m ft lb PBIC3538J 1 Timing chain slack guide 2 Timing chain tensioner 3 Camshaft sprocket EXH 4 Timing chain 5 Oil filler cap 6 Front cover 7 O ring 8 Intake valve timing control solenoid 9 Crankshaft pulley bolt valve 10 Crankshaft pulley 11 Front oil seal 12 Drive belt auto tensioner 13 Timing chairi tension guide front ov 14 Crankshaft sprocket 15 Oil pump sprocket er side Revision July 2007 EM 37 2008 Sentra TIMING CHAIN lt SERVICE INFORMATION gt MR20DE 16 Oil pump drive chain 17 Camshaft sprocket INT 18 Timing chain tension guide 19 O ring 20 Chain tensioner for oil pump A Refer to EM 38 B Refer to EM 46 Removal and Installation INFOID 0000000001 849593 CAUTION The rotating direction indicated in the text indicates all directions seen from the engine front REMOVAL 1 Remove front RH wheel Refer to WT 6 2 Remove front fender protector RH Refer to El 20 3 Drain engine oil Refer to LU 6 Changing Engine Oil NOTE Perform this step when engine is cold 4 Remove the following parts e Rocker cover Refer to EM 30 Component e Drive belt Refer to EM 13 Component e Water pump pulley Refer to CO 17
72. 30 0 0639 0 0642 damage the fillet R All crankshaft pins Revision July 2007 EM 190 All journals and all crankshaft pins KBIAO148E 2008 Sentra CYLINDER BLOCK lt SERVIGEINFORMATION gt IRS DET HOW TO SELECT A MAIN BEARING When New Cylinder Block and Crankshaft are Used 1 Main Bearing Selection Table rows correspond to bearing housing grade on rear left side of cylinder block e If there is a corrected stamp mark on the cylinder block use it as a correct reference Corrected stamping position j Basic stamping position Cylinder Main bearing bore grade housing grade sBiao283E 2 Apply journal diameter grade stamped on crankshaft front side to column in Main Bearing Selection Table WBIA0901E 3 Find value at crossing of row and column in Main Bearing Selection Table CAUTION There are two main bearing selection tables One is for odd numbered journals 1 3 and 5 and the other is for even numbered journals 2 and 4 Make certain to use the appropriate table This is due to differences in the specified clearances 4 Apply the symbol obtained to Main Bearing Grade Table to select NOTE e Service parts are available as a set of both upper and lower When Cylinder Block and Crankshaft are Reused 1 Measure inner diameter of cylinder block main bearing housing and outer diameter of crankshaft journal 2 Apply measurement
73. 30 1 1 1654 1 1850 Intake 60 Angle a 1 Exhaust 60 Intake 88 46 90 14 Angle a 2 Exhaust 88 46 90 14 Intake 120 Angle a3 Exhaust 120 Intake 0 99 1 35 0 0390 0 0531 Contacting width W Exhaust 1 19 1 55 0 0469 0 0610 1 Machining data CAMSHAFT AND CAMSHAFT BEARING Unit mm in Standard Camshaft runout TIR Less than 0 04 0 0016 A SEM671 Intake 44 815 45 005 1 7644 1 7718 Cam height A Exhaust 43 975 44 165 1 7313 1 7388 No 1 i 27 935 27 955 1 0998 1 1006 Outer diameter of camshaft journal No 2 3 4 5 23 435 23 455 0 9226 0 9234 No 1 Inner diameter of camshaft bracket SEO ER 0A ICT Dee 11032 No 2 3 4 5 23 500 23 521 0 9252 0 9260 Camshaft journal clearance 0 045 0 086 0 0018 0 0034 Camshaft end play 0 115 0 188 0 0045 0 0074 Camshaft sprocket runout TIR Less than 0 15 0 0059 Total indicator reading Revision July 2007 EM 208 2008 Sentra lt SERVICE INFORMATION gt SERVICE DATA AND SPECIFICATIONS SDS CYLINDER BLOCK 120 4 72 PBICO281E Surface distortion Limit 0 1 0 004 Grade No 2 89 010 89 020 3 5043 3 5047 F Standard Cylinder bore Inner diameter Grade No 3 89 020 89 030 3 5047 3 5051 Wear limit 0 2 0 008 Out of round X Y Less than 0 015 0 0006 Taper C A Less than 0 01 0 0004 Gra
74. 310 43 965 43 966 1 7309 1 7309 43 964 43 965 1 7309 1 7309 43 963 43 964 1 7308 1 7309 43 962 43 963 1 7308 1 7308 43 961 43 962 1 7307 1 7308 43 960 43 961 1 7307 1 7307 43 959 43 960 1 7307 1 7307 43 958 43 959 1 7306 1 7307 43 957 43 958 1 7306 1 7306 43 956 43 957 1 7305 1 7306 43 955 43 956 1 7305 1 7305 43 954 43 955 1 7305 1 7305 43 953 43 954 1 7304 1 7305 MR20DE Main journal diameter grade Dm Total indicator reading Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No S lt CHAMODVZSTACIOMMVOWOFY CHAWMDVZSTHACIOMMVOIOWOS 51 978 51 979 2 0464 2 0464 51 977 51 978 2 0463 2 0464 51 976 51 977 2 0463 2 0463 51 975 51 976 2 0463 2 0463 51 974 51 975 2 0462 2 0463 51 973 51 974 2 0462 2 0462 51 972 51 973 2 0461 2 0462 51 971 51 972 2 0461 2 0461 51 970 51 971 2 0461 2 0461 51 969 51 970 2 0460 2 0461 51 968 51 969 2 0460 2 0460 51 967 51 968 2 0459 2 0460 51 966 51 967 2 0459 2 0459 51 965 51 966 2 0459 2 0459 51 964 51 965 2 0458 2 0459 51 963 51 964 2 0458 2 0458 51 962 51 963 2 0457 2 0458 51 96
75. 4 17 8 kg f 34 39 Ib f 151 175 N 15 4 17 8 kg f 34 39 Ib f Height during valve open 25 3 mm 0 996 in 26 76 mm 1 0535 in Load with valve open Revision July 2007 351 394 N 35 8 40 2 kg f 79 89 Ib f EM 176 318 362 N 32 4 36 9 kg f 71 81 Ib f 2008 Sentra ENGINE ASSEMBLY lt SERVIGEINFORMATION gt IRS DET ENGINE ASSEMBLY Re moval and Installation INFOID 000000000 1849648 SEC 112 jeo 6 1 44 PP 45 4 6 33 WBIA0894E 1 LH transaxle mounting insulator CVT 2 LH transaxle mounting bracket 3 Transaxle mounting insulator M T 4 RH engine mounting insulator 5 Rear engine mounting insulator ori 6 Front suspension member ent by direction mark 7 Front engine mounting insulator orient by direction mark WARNING Place chocks at the front and back of the rear wheels For engines not equipped with slingers attach proper slingers and bolts as described in the parts catalog CAUTION Do not start working until the exhaust system and coolant are cool If items or work required are not covered by the engine main body section follow the applicable pro cedures Use the correct supporting points for lifting and jacking Refer to GI 38 In removing the drive shaft be careful not to damage the grease seals on the transaxle Revision July 2007 EM 177 2008 Sentra ENGINE ASSEMBLY lt SERVICE INFORMATION gt QR25DE Before sepa
76. 49632 SEC 110 150 oles ae 31 enn C215 22 16 roe a ji 3 0x1 S en nT l Gnd 5 22 A og OJ21 5 2 2 16 WBIA0867E 1 Oil dipstick tube 2 Oil pan upper 3 Cylinder block 4 Oil filter 5 Oil pickup screen 6 Drain plug 7 Oil pan lower 8 Rear plate cover 9 O ring A Oil pan side REMOVAL WARNING To avoid the danger of being scalded never drain the engine oil when the engine is hot 1 O CN OY Ol Oo N Remove the engine under covers on both sides using power tool Drain engine oil Refer to LU 16 Changing Engine Oil Remove oil level gauge and indicator Remove the front exhaust tube Refer to EX 6 Removal and Installation Remove lower steering joint bolt Remove power steering hose bracket from rear of collector Remove LH and RH drive shafts Remove A C compressor Refer to MTC 86 Removal and Installation for Compressor QR25DE Support the engine from above and underneath with suitable hoist and floor jack Remove the front suspension member for clearance to remove the oil pan Refer to FSU 10 Removal and Installation Revision July 2007 EM 134 2008 Sentra OIL PAN AND OIL STRAINER lt SERVIGEINFORMATION gt oo O 11 Remove the lower oil pan bolts Loosen the bolts in the order shown using power tool 12 Remove the lower oil pan using Tool NOTE Tap gently to cut sealant around the pan do not damage the mating surface using Tool Tool
77. 6 0 3213 816U 8 18 0 3220 818U 8 20 0 3228 820U 8 22 0 3236 822U 8 24 0 3244 824U 8 26 0 3252 826U 8 28 0 3260 828U 8 30 0 3268 830U 8 32 0 3276 832U 8 34 0 3283 834U 8 36 0 3291 836U 8 38 0 3299 838U Valve Spring Specifications Intake Exhaust Identification color Pink Blue Free height 43 72 43 92 mm 1 7213 1 7291 in 45 29 45 49 mm 1 7831 1 7909 in Pressure standard at height 35 30 mm 1 390 in 151 175 N 15 4 17 8 kg f 34 39 Ib f 151 175 N 15 4 17 8 kg f 34 39 Ib f Squareness 1 9 mm 0 0748 in 1 9 mm 0 0748 in Installation height Revision July 2007 35 30 mm 1 390 in EM 206 35 30 mm 1 390 in 2008 Sentra SERVICE DATA AND SPECIFICATIONS SDS lt SERVICE INFORMATION gt QR25DE Specifications Intake Exhaust Installation load 151 175 N 15 4 17 8 kg f 34 39 Ib f 151 175 N 15 4 17 8 kg f 34 39 Ib f Height during valve open 25 30 mm 0 996 in 26 76 mm 1 0535 in Load with valve open 351 394 N 35 8 40 2 kg f 79 89 Ib f 318 362 N 32 4 36 9 kg f 71 81 Ib f Valve Lifter Unit mm in Description Standard Valve lifter outer diameter 33 977 33 987 1 3377 1 3381 Lifter lifter bore inner diameter 34 000 34 021 1 3386 1 3394 Clearance between lifter and lifter guide 0 013 0 0544 0 0005 0 0018 Valve Guide Unit
78. 88 0 0589 Black n LWR 1 497 1 500 0 0589 0 0591 Brown UPR 1 497 1 500 0 0589 0 0591 Brown E LWR 1 500 1 503 0 0591 0 0592 Green Grade and color are different between upper and lower bear a UPR 1 500 1 503 0 0591 0 0592 Green ings LWR 1 503 1 506 0 0592 0 0593 Yellow UPR 1 503 1 506 0 0592 0 0593 Yellow i LWR 1 506 1 509 0 0593 0 0594 Blue Undersize Bearings Usage Guide e When the specified connecting rod bearing oil clearance is not obtained with standard size connecting rod bearings use undersize US bearings e When using undersize US bearing measure the connecting rod bearing inner diameter with bearing installed and grind the crankshaft pin so that the connecting rod bearing oil clearance satisfies the standard CAUTION In grinding crankshaft pin to use undersize bearings keep the fillet R 1 5 1 7 mm 0 059 0 067 in A PBIC3263J Bearing undersize table Unit mm in Size Thickness US 0 25 0 0098 1 623 1 631 0 0639 0 0642 HOW TO SELECT MAIN BEARING When New Cylinder Block and Crankshaft are Used Revision July 2007 EM 84 2008 Sentra CYLINDER BLOCK lt SERVICEINFORMATION gt EMRE 1 2 3 Main Bearing Selection Table rows correspond to main bearing housing grade on rear left side of cylinder block L Correction stamp Standard stamp Cylinder No 1 bore grade Cylinder No 2 bore grade Cylinder No
79. 88 0 0781 0 0783 45 Blue Pink LWR 1 988 1 991 0 0783 0 0784 UPR 1 988 1 991 0 0783 0 0784 56 Pink Purple LWR 1 991 1 994 0 0784 0 0785 UPR 1 991 1 994 0 0784 0 0785 67 Purple White LWR 1 994 1 997 0 0785 0 0786 Use Undersize Bearing Usage Guide e Use undersize U S bearing when oil clearance with standard size main bearing is not within specification e When using undersize U S bearing measure the bearing inner diameter with the bearing installed and grind journal until oil clearance falls within specification Bearing Undersize Table Fillet R 1 5 1 7 mm 0 059 0 067 in Unit mm in All journals and all crankshaft pins Size U S Thickness 0 25 0 0098 2 106 2 114 0 0829 0 0832 CAUTION Do not damage fillet R when grinding crankshaft journal in order to use an undersize bearing all journals Inspection After Disassembly CRANKSHAFT SIDE CLEARANCE e Using a dial gauge measure the clearance between the thrust bearings and the crankshaft arm when the crankshaft is moved fully forward or backward Standard 0 10 0 26 mm 0 0039 0 0102 in Limit 0 30 mm 0 0118 in e If the measured value exceeds the limit replace the thrust bear ings and measure again If it still exceeds the limit replace the crankshaft CONNECTING ROD SIDE CLEARANCE Revision July 2007 EM 194 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt e Measure
80. ATER CONTROL VALVE Valve opening temperature Differential limit between cylinders 100 1 0 1 0 15 Auto adjustment by auto tensioner 93 5 96 5 C 200 206 F Maximum valve lift 8 mm 108 C 0 315 in 226 F Valve closing temperature EXHAUST MANIFOLD More than 90 C 194 F Unit mm in Items Limit ee ae Each exhaust port 0 3 0 012 Entire part 0 7 0 028 THERMOSTAT Valve opening temperature 80 5 83 5 C 177 182 F Maximum valve lift 8 mm 95 C 0 315 in 203 F Valve closing temperature More than 77 C 171 F SPARK PLUG Unit mm in Plug type Platinum tipped TYPE Make NGK Standard type PLZKAR6A 11 Spark plug gap Nominal 1 1 0 043 CYLINDER HEAD Revision July 2007 EM 103 2008 Sentra SERVICE DATA AND SPECIFICATIONS SDS lt SERVICE INFORMATION gt MR20DE Unit mm in Items Standard Limit Head surface distortion 0 1 0 004 Normal cylinder head height H 130 9 5 15 H PBIC0924E VALVE Valve Timing Unit degree Valve timing BDC PBIC4542E a b c d e f 220 232 13 27 65 25 7 33 _ Valve timing control ON Valve Dimensions Unit mm in T Margin thickness SEM188A Intake 33 8 34 1 1 331 1 343 Valve head diameter D Exhaust 27 6 27 9 1 087 1 098 Intake 106 21 4 181 Valve length L Exhaust 105 26
81. C3164J Install crankshaft pulley CAUTION Never damage front oil seal lip section If needed use a plastic hammer tap on its center portion not circumference to seat crankshaft pulley Secure crankshaft pulley 1 using tool A Apply new engine oil to thread and seat surfaces of crankshaft pulley bolt Tighten crankshaft pulley bolt in three steps Step 1 68 6 N m 7 0 kg m 51 ft lb Step 2 0ON m 0 kg m 0 ft lb Step3 29 4 N m 3 0 kg m 22 ft lb PBIC3961E Put a paint mark B on crankshaft pulley 2 matching with any one of six easy to recognize angle marks A on crankshaft pul ley bolt 1 flange Turn another 60 degrees clockwise angle tightening using Tool e Check the tightening angle with movement of one angle mark Tool number KV10112100 BT 8653 A Make sure that crankshaft rotates clockwise smoothly Installation of the remaining components is in the reverse order of removal Revision July 2007 EM 45 2008 Sentra CAMSHAFT lt SERVIGEINFORMATION gt EMRE CAMSHAFT Component INFOID 000000000 1849594 SEC 11191309221 1 88 2 9 0 65 fg Nem kg m in Ib O Nem kg m ft lb PBIC4589E O ring 2 Camshaft position sensor PHASE 3 Camshaft bracket Camshaft sprocket EXH 5 Camshaft sprocket INT 6 Camshaft EXH Camshaft INT 8 Valve lifter EXH 9 Valve lifter INT 10 Cylinder head A Refer to EM 46 Re m oval a nd n stal lat i O n INFOID 0
82. C3588J 20 Install connecting rod bearing upper 2 and lower 3 to con necting rod 1 and connecting rod cap 4 C Oil hole connecting rod D Arrow view lt x Engine front e Install the connecting rod in the dimension shown e Make sure that connecting rod bearing oil hole A is com 5 95 2 45mm pletely in the inside of connecting rod oil hole chamfered area 0 080 0 096in B e When installing connecting rod bearings apply new engine oil to the bearing surface inside Do not apply new engine oil to the back surface but thoroughly clean it NOTE e There is no positioning tab e Install the connecting rod bearings in the center of connect ing rod and connecting rod bearing cap as shown For ser vice operation the center position can be checked visually PBIC4541E 21 Install piston and connecting rod assembly to crankshaft e Position crankshaft pin corresponding to connecting rod to be installed onto the bottom dead center e Apply new engine oil sufficiently to the cylinder bore piston and crankshaft pin e Match the cylinder position with the cylinder number C on connecting rod to install Oil hole Big end diameter grade Small end diameter grade mo WwW F Front mark connecting rod bearing cap e Install so that front mark A on the piston head faces the front of engine PBIC3587J Revision July 2007 EM 78 2008 Sentra CYLINDER BLOCK lt SERVIGEINFORMATION gt
83. CAUTION Be careful not to damage front cover and crankshaft e Press fit oil seal straight to avoid causing burrs or tilting e Never touch grease applied onto oil seal lip 11 Install new O ring to cylinder block CAUTION Be sure O rings a aligned properly 12 Apply the sealant without breaks to the specified location using Tool Use Genuine Silicone RTV Sealant or equivalent Refer to GI 42 Recommended Chemical Product and Sealant Tool number WS39930000 A Liquid gasket application area lt I Engine outside PBIC3959E 13 Make sure that matching marks of timing chain and each sprocket are still aligned CAUTION Make sure O ring on cylinder block is correctly installed e Be careful not to damage front oil seal by interference with front end of crankshaft Revision July 2007 EM 44 2008 Sentra 15 16 17 18 19 20 21 22 23 TIMING CHAIN lt SERVIGEINFORMATION gt R20 14 Install front cover and tighten bolts in numerical order as shown CAUTION Attaching should be done within 5 minutes after liquid gas ket application NOTE Use the following for the installation position of bolts M6 bolts No 1 M10 bolts No 6 7 10 11 14 M12 bolts No 2 4 8 12 M8 bolts Except the above Tighten all bolts are in two stages to specified torque in numeri cal order as shown CAUTION Be sure to wipe off any excessive liquid gasket leaking PBI
84. CYLINDER HEAD lt SERVICE INFORMATION gt RO VALVE SPRING SQUARENESS e Set try square along the side of valve spring and rotate the spring Measure the maximum clearance between the top of valve spring and try square CAUTION Never remove valve spring seat from valve spring Limit 1 9 mm 0 075 in e If it exceeds the limit replace valve spring with valve spring seat A aN Try square PBIC0080E VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD e Check valve spring pressure with valve spring seat installed at the specified spring height CAUTION Never remove valve spring seat from valve spring Standard Items Intake Exhaust Free height 44 90 45 10 mm 1 7677 1 7755 in 45 74 45 94 mm 1 8007 1 8086 in Installation height 35 30 mm 1 390 in 35 30 mm 1 390 in Installation load 153 173 N 15 6 17 6 kg 34 39 Ib 139 157 N 14 2 16 kg 10 35 Ib Height during valve open 26 36 mm 1 0377 in 27 80 mm 1 0944 in Load with valve open 335 377 N 34 2 38 5 kg 75 85 Ib 266 297 N 27 1 3 03 kg 60 67 Ib Identification color White Orange e If the installation load or load with valve open is out of the standard replace valve spring with valve spring seat Revision July 2007 EM 70 2008 Sentra CYLINDER BLOCK lt SERVIGEINFORMATION gt o EMIR2007 CYLINDER BLOCK Co m p O n e nt INFOID 0000000001849606 SEC 110 120 150 221 226 253 wp 22 5
85. Crankshaft pulley bolt No angle wrench is required as the bolt flange is provided with notches for angular tightening Do not use a torque value for final tightening e The torque value for these parts are for a preliminary step Ensure thread and seat surfaces are clean and coated with engine oil Precaution for Liquid Gasket INFOID 0000000001849620 REMOVAL OF LIQUID GASKET SEALING After removing the bolts and nuts separate the mating surface and s remove the sealant using Tool rae 5 Ji KV101 11100 Tool number KV10111100 J 37228 J37228 0 4 CAUTION ow zd O Be careful not to damage the mating surfaces e In areas where the cutter is difficult to use use a plastic hammer to SS Slide ya lightly tap 1 the cutter where the RTV Silicone Sealant is applied Use a plastic hammer to slide the cutter 2 by tapping on the side CAUTION If for some unavoidable reason a tool such as a flat bladed screwdriver is used be careful not to damage the mating sur faces LIQUID GASKET APPLICATION PROCEDURE 1 Using a scraper remove the old Silicone RTV Sealant adhering to the gasket application surface and the mating surface e Remove the sealant completely from the groove of the gasket application surface mounting bolts and bolt holes 2 Thoroughly clean the gasket application surface and the mating surface and remove adhering moisture grease and foreign materials 3 Attach the seala
86. D 47 003 47 004 1 8505 1 8505 Grade No E 47 004 47 005 1 8505 1 8506 Grade No F 47 005 47 006 1 8506 1 8506 Connecting rod big end diameter Grade No G 47 006 47 007 1 8506 1 8507 Grade No H 47 007 47 008 1 8507 1 8507 Grade No J 47 008 47 009 1 8507 1 8507 Grade No K 47 009 47 010 1 8507 1 8508 Grade No L 47 010 47 011 1 8508 1 8508 Grade No M 47 011 47 012 1 8508 1 8509 Grade No N 47 012 47 013 1 8509 1 8509 After installing in connecting rod CRANKSHAFT SEM645 Unit mm in PBIC3459J Center distance r 40 41 40 49 1 5909 1 5940 Out of round Difference between X and Y Limit 0 0035 0 0001 Taper Difference between A and B Limit 0 0035 0 0001 Standard 0 05 0 0020 Runout TIR Limit 0 10 0 0040 Standard 0 10 0 26 0 0039 0 0102 Crankshaft end play Limit 0 30 0 012 Revision July 2007 EM 110 2008 Sentra SERVICE DATA AND SPECIFICATIONS SDS lt SERVICE INFORMATION gt Pin journal diameter grade Dp Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No Grade No 43 970 43 971 1 7311 1 7311 43 969 43 970 1 7311 1 7311 43 968 43 969 1 7310 1 7311 43 967 43 968 1 7310 1 7310 43 966 43 967 1 7309 1 7
87. E d Tighten the lower oil pan bolts in the numerical order shown e Wait at least 30 minutes after the oil pans are installed before filling the engine with oil WBIA0873E INSPECTION AFTER INSTALLATION e Check for any engine oil leaks with the engine at operating temperature and running at idle Revision July 2007 EM 136 2008 Sentra IGNITION COIL lt SERVIGE INFORMATION gt IRE IGNITION COIL Removal and Installation 7 0 7 62 INFOID 000000000 1849633 WBIA0859E 1 Ignition coil 2 Spark plug 3 Rocker cover REMOVAL 1 Remove the engine cover 2 Remove air duct Refer to EM 127 Removal and Installation 3 Disconnect the harness connector from the ignition coil 4 Remove the ignition coil CAUTION Do not drop or shock it INSTALLATION Installation is in the reverse order of removal Revision July 2007 EM 137 2008 Sentra SPARK PLUG lt SERVIGEINFORMATION gt oo o A SPARK PLUG Removal and Installation INFOID 0000000001849634 K 7 0 7 62 WBIA0859E 1 Ignition coil 2 Spark plug 3 Rocker cover REMOVAL 1 Remove the ignition coil Refer to EM 137 Removal and Installation 2 Remove the spark plug with a suitable spark plug wrench L 14 mm 0 55 in PBIC2982E INSPECTION AFTER REMOVAL Do not use a wire brush for cleaning the spark plugs Replace as necessary SMA773C e If plug is covered with carbon a spark plug cleaner may be used Cleaner air pressu
88. ENGINE SECTION E M ENGINE MECHANICAL CONTENTS MR20DE Changing Air Cleaner Filter cccccecesseseeeeees 17 SERVICE INFORMATION oeenn 3 INTAKE MANIFOLD asssssssusnennnnnnnnennnnnnnnnnnnnnnna 18 COMPONENT senie aen a a a aaa a a aaa 18 PRECAUTIONS nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn 3 Removal and Installation c ccccccscccssscesssesseeeaes 18 Precaution for Supplemental Restraint System SRS AIR BAG and SEAT BELT PRE TEN EXHAUST MANIFOLD 00 0 00cceeeceeeeeeeeeeeceeees 21 116 1 215 sean MAE Rn aL AEC Mie Mei ne 3 Component seoneeeeenneceeennceeennacetennceesensttn 21 Precaution for Procedure without Cowl Top Cover 3 Removal and Installation cssssesssseeres 21 Precaution Necessary for Steering Wheel Rota tern Aer Battery DISGONAOGt saci aa scant canes 3 oe PAN seisaiees escinieatnnceiaetearaeiediececwiae areais 24 f OMPONENU vii sscleccsevctece dee pedseaesctonrsnadadsbateudeevavsund tates 24 Precaution for Drain Coolant 0 ccceceeceeeeeeeees 4 os Removal and Installation ccccecceeeeeeeeeeeeeees 24 Precaution for Disconnecting Fuel Piping 4 Precaution for Removal and Disassembly 4 IGNITION COIL SPARK PLUG AND ROCK Precaution for Inspection Repair and Replace EE COV ERE anar rana anani rabena anni eSak veakteatiinoce 30 ment Mtstestetttesittretnsnttnnnntnennnttnnnnnnttnt Sreererterr retenen annt 4 COMPONE
89. I 38 Garage Jack and Safety Stand and 2 Pole Lift REMOVAL Outline Remove the engine and the transaxle assembly from the vehicle downward Separate the engine and the tran saxle 1 2 P 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Remove engine undercover Drain engine coolant from radiator Refer to CO 11 Changing Engine Coolant CAUTION e Perform this step when the engine is cold Do not spill engine coolant on drive belt Remove front fender protector RH and LH Refer to El 21 Removal and Installation Remove exhaust front tube Refer to EX 3 Remove drive shafts LH and RH from steering knuckle Refer to FAX 8 Removal and Installation Left Side and FAX 10 Removal and Installation Right Side Remove transaxle joint bolts which pierce at oil pan upper lower rear side Refer to CVT 187 CVT or MT 17 Removal and Installation M T models Remove rear torque rod Remove hood assembly Refer to BL 13 Remove cowl top cover and cowl top extension assembly Refer to El 18 Release fuel pressure Refer to EC 83 Fuel Pressure Check Remove battery and battery tray Refer to SC 4 Remove drive belt Refer to EM 13 Component Remove air duct and air cleaner case assembly Refer to EM 16 Remove cooling fan assembly Remove radiator hose upper and lower Refer to CO 14 Disconnect CVT fluid cooler hoses Refer to CO 14 Disconnect all conne
90. Installation QR25DE Revision July 2007 EM 178 2008 Sentra ENGINE ASSEMBLY lt SERVICEINFORMATION gt PRD 29 Separate engine and transaxle INSTALLATION Combine engine and transaxle assembly Refer to CVT 189 Removal and Installation QR25DE CVT MT 67 Removal and Installation or MT 143 Removal and Installation M T Installation is in the reverse order of removal Do not allow oil to get on mounting insulators Be careful not to damage mounting insulators e If parts have a direction mark arrow this indicates front of the vehicle and the parts must be installed according to the identification mark INSPECTION AFTER INSTALLATION Before starting engine check oil fluid levels including engine coolant and engine oil If less than required quantity fill to the specified level Refer to MA 13 Use procedure below to check for fuel leakage Turn ignition switch ON with engine stopped With fuel pressure applied to fuel piping check for fuel leak age at connection points Start engine With engine speed increased check again for fuel leakage at connection points Run engine to check for unusual noise and vibration Warm up engine thoroughly to make sure there is no leakage of fuel exhaust gas or any oils fluids including engine oil and engine coolant Bleed air from passages in lines and hoses such as in cooling system After cooling down engine again check oils fluids including engine oil and engine coolan
91. LINDER HEAD lt SERVICE INFORMATION gt ERODE 3 Ream cylinder head valve guide hole using suitable tool A Valve guide hole diameter for service parts 9 675 9 696 mm 0 3809 0 3817 in 4 Heat cylinder head to 110 to 130 C 230 to 266 F by soaking in heated oil A PBIC3214J 5 Press valve guide 1 from camshaft side to dimensions as shown 2 Cylinder head Projection H 13 35 13 65 mm 0 526 0 537 in CAUTION Cylinder head contains heat when working wear protective equipment to avoid getting burned 6 Apply reamer finish to valve guide using suitable tool A Standard 5 500 5 518 mm 0 2165 0 2172 in VALVE SEAT CONTACT e After confirming that the dimensions of valve guides and valves are within specifications perform this proce dure e Apply prussian blue or white lead onto contacting surface of valve seat to check the condition of the valve contact on the surface Revision July 2007 EM 68 2008 Sentra CYLINDER HEAD lt SERVICE INFORMATION gt MR20DE e Check if the contact area band is continuous all around the circum ference e If not grind to adjust valve fitting and check again If the contacting surface still has NG conditions even after the re check replace valve seat NG SBIA0322E VALVE SEAT REPLACEMENT When valve seat is removed replace with oversized 0 5 mm 0 020 in valve seat 1 Bore out old seat until it collapses Boring
92. N e Zecies Aiea uations tare 30 Precaution for Assembly and Installation 4 Removal and Installation 30 Parts Requiring Angular Tightening eee 4 Precaution for Liquid Gasket 0 cccceceeeseeeeetees 5 FUEL INJECTOR AND FUEL TUBE 33 Component A 4 08 tet ae aaa aeaa t eaaa aoaaa 33 PREPARATION S on N vaa RA ee 7 Removal and Installation 33 Special Service Tool ccccecceeeseeeeeeeeeeeeeeeeeeees 7 Commercial Service Tool ccceecceeeeseeteeteees 9 TIMING CHAIN ccc cccceccsecsssscesssesseesseesseesseeees 37 COMPONMENE svsecae teveueseedeseedeeneiveansscidecbes eisiea 37 NOISE VIBRATION AND HARSHNESS Removal and Installation cceeeeeeeeeseeeeeeeeees 38 NVH TROUBLESHOOTING secceeeeeseees 11 NVH Troubleshooting Engine Noise 0 Pte CAMSHAFT ierant onaniaa daaimatan aaa 46 Use the Chart Below to Help You Find the Cause Component ssssesseessseesssesseessrsssrrsstrnserrsstrnsernsenrn nns 46 Of the Symptom sssssssssesesessrsesrnessressressnrssressrensenns 12 Removal and Installation eaeeeeeeennee 46 Valve Clearance cccccccesseccessseeceeeesseeeeessenseeeeees 54 DRIVE BELTS suc2sitecisivclaictecacietiecistrettavecentiueds 13 Component i iat cuecketiictieit maaituatcaanaresssdakannateatesads 13 COIL SEAL T aT 58 Checking Drive Belts cccccceeeseeeeeeeeeesteeeeenees 13 Removal and I
93. Remove the lower exhaust manifold covers 8 Remove the upper exhaust manifold cover Revision July 2007 EM 132 2008 Sentra EXHAUST MANIFOLD AND THREE WAY CATALYST lt SERVIGE INFORMATION gt RSE 9 Loosen the nuts in reverse order as shown on the exhaust man ifold and three way catalyst 10 Remove the exhaust manifold and three way catalyst assembly and gasket Discard the gasket INSPECTION AFTER REMOVAL Surface Distortion e Use a reliable straightedge and feeler gauge to check the flatness of exhaust manifold fitting surface Limit 0 7 mm 0 0276 in P Feeler gauge KBIA0046E INSTALLATION Installation is in the reverse order of removal Pay attention to the following Tightening Exhaust Manifold Nuts e Tighten the nuts in the numerical order shown to specification Installation of A F Sensors and Heated Oxygen Sensors Clean the A F sensor and heated oxygen sensor threads with the Tool then apply the anti seize lubricant to the threads before installing the A F sensor and heated oxygen sensors Tool number J 43897 18 J 43897 12 CAUTION Do not over tighten the A F sensors and heated oxygen sensors Doing so may cause damage to the A F sensors and heated oxygen sensors resulting in a malfunction and the MIL coming on Revision July 2007 EM 133 2008 Sentra OIL PAN AND OIL STRAINER lt SERVICE INFORMATION gt QR25DE OIL PAN AND OIL STRAINER Removal and Installation INFOID 0000000001 8
94. UPR 1 973 1 976 0 0777 0 0778 01 Black Brown LWR 1 976 1 979 0 0778 0 0779 UPR 1 976 1 979 0 0778 0 0779 12 Brown Green LWR 1 979 1 982 0 0779 0 0780 UPR 1 979 1 982 0 0779 0 0780 23 Green Yellow LWR 1 982 1 985 0 0780 0 0781 UPR 1 982 1 985 0 0780 0 0781 Grade and color are different 34 f Yellow Blue for upper and lower bearings LWR 1 985 1 988 0 0781 0 0783 UPR 1 985 1 988 0 0781 0 0783 45 Blue Pink LWR 1 988 1 991 0 0783 0 0784 UPR 1 988 1 991 0 0783 0 0784 56 Pink Purple LWR 1 991 1 994 0 0784 0 0785 UPR 1 991 1 994 0 0784 0 0785 f 67 Purple White LWR 1 994 1 997 0 0785 0 0786 Undersize Unit mm in Size U S Thickness Main journal diameter 0 25 0 0098 2 106 2 114 0 0829 0 0832 Grind so that bearing clearance is the spec ified value Bearing Clearance Unit mm in No 1 3 and 5 0 012 0 022 0 0005 0 0009 Main bearing oil clearance ee No 2 and 4 0 018 0 028 0 0007 0 0011 Limit 0 1 0 004 CONNECTING ROD BEARING Grade number Thickness mmn in Identification color 0 1 493 1 496 0 0588 0 0589 Black 1 1 496 1 499 0 0589 0 0590 Brown 2 1 499 1 502 0 0590 0 0591 Green 3 1 502 1 505 0 0591 0 0593 Yellow 4 1 505 1 508 00 593 0 0594 Blue Undersize Unit mm in Size U S Thickness Crank pin journal diameter 0 25 0 0098 1 622 1 630 0
95. VIGEINFORMATION gt R20 Standard 0 037 0 047 0 0015 0 0019 Connecting rod bearing oil clearance Limit 0 07 0 0028 Revision July 2007 EM 113 2008 Sentra PRECAUTIONS lt SERVICE INFORMATION gt QR25DE SERVICE INFORMATION PRECAUTIONS Precaution for Supplemental Restraint System SRS AIR BAG and SEAT BELT PRE TENSIONER INFO1D 0000000001849613 The Supplemental Restraint System such as AIR BAG and SEAT BELT PRE TENSIONER used along with a front seat belt helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision This system includes seat belt switch inputs and dual stage front air bag modules The SRS system uses the seat belt switches to determine the front air bag deployment and may only deploy one front air bag depending on the severity of a collision and whether the front occupants are belted or unbelted Information necessary to service the system safely is included in the SRS and SB section of this Service Man ual WARNING e To avoid rendering the SRS inoperative which could increase the risk of personal injury or death in the event of a collision which would result in air bag inflation all maintenance must be performed by an authorized NISSAN INFINITI dealer Improper maintenance including incorrect removal and installation of the SRS can lead to personal injury caused by unintentional activation of the system For removal of Spira
96. VT solenoid valves to IVT cover Install new oil rings to the intake camshaft sprocket insertion points on IVT control cover backside Install new O ring to front cover Revision July 2007 EM 162 2008 Sentra d e 10 11 12 TIMING CHAIN lt SERVICEINFORMATION gt o o QR2SDE Apply Silicone RTV Sealant to the IVT cover as shown e Apply Genuine Silicone RTV Sealant or equivalent to posi tions specified Refer to Gl 42 Recommended Chemical Product and Sealant WBIA0882E Tighten the IVT cover bolts in the numerical order as shown WBIA0883E Insert crankshaft pulley by aligning with crankshaft key e Tap its center with a plastic hammer to insert Do not tap the belt hook Tighten crankshaft pulley bolts e Secure crankshaft pulley with a pulley holder to tighten the bolt e Perform angle tightening using Tool with the following procedure Tool number KV10112100 BT 8653 A Apply new engine oil to threads and seat surfaces of bolts Tighten to initial specifications Crankshaft pulley bolt initial tightening 37 3 47 1 N m 3 8 4 8 kg m 28 34 ft lb Apply a paint mark on the front cover mating with any one of six S easy to recognize stamp marks on bolt flange ae Turn crankshaft pulley bolt another 60 to 66 degrees Target LO 60 degrees e Check vertical mounting angle with movement of one stamp mark Installation of the remaining components is in rever
97. a CYLINDER BLOCK lt SERVICEINFORMATION gt MRE Measure the outer diameter of piston pin with a micrometer A Standard 19 989 19 995 mm 0 7870 0 7872 in PBIC3266J Connecting Rod Bushing Oil Clearance Connecting rod bushing oil clearance Connecting rod bushing inner diameter Piston pin outer diame ter Standard 0 005 0 023 mm 0 0002 0 0009 in Limit 0 03 mm 0 0012 in e If the measured value is out of the standard replace connecting rod assembly and or piston and piston pin assembly e If replacing piston and piston pin assembly follow the PISTON TO PISTON PIN OIL CLEARANCE proce dure e If replacing connecting rod assembly follow the Connecting Rod Bushing Oil Clearance procedure to select connecting rod bearing CYLINDER BLOCK TOP SURFACE DISTORTION e Using a scraper remove gasket on the cylinder block surface and also remove engine oil scale carbon or other contamination CAUTION Be careful not to allow gasket flakes to enter engine oil or engine coolant passages e Measure the distortion on the cylinder block upper face at some different points in six directions with a straight edge A and feeler gauge B Limit 0 1 mm 0 004 in e If it exceeds the limit replace cylinder block O Oo ee oars ee MAIN BEARING HOUSING INNER DIAMETER Install main bearing cap without main bearings installed and tighten main bearing cap bolts to the specified torque Refer to EM 72 Di
98. ain engine oil Refer to LU 6 Changing Engine Oil 2 Remove engine and transaxle assembly Refer to EM 99 Removal and Installation 3 Remove oil filter using Tool Tool number KV10115801 Revision July 2007 EM 24 2008 Sentra OIL PAN lt SERVIGEINFORMATION gt ooo EMR2007 CAUTION When removing prepare a shop cloth to absorb any engine oil leakage or spillage 4 Remove oil pan lower bolts in reverse order as shown lt Engine front PBIC3146J 5 After removing the bolts and nuts separate the mating surface and remove the sealant using Tool Tool number KV10111100 J 37228 e Slide 1 the Tool by tapping 2 its side with a hammer to remove the lower oil pan from the upper oil pan CAUTION Be careful not to damage the mating surfaces WBIAOS566E 6 Remove the following parts e Flywheel M T models or drive plate CVT models Refer to EM 71 e Front cover timing chain oil pump drive chain Refer to EM 37 7 Remove oil pan lower bolts in reverse order as shown lt Engine front 8 Insert a screwdriver shown by the arrow and open up a crack between oil pan upper and cylinder block lt Engine front CAUTION A more adhesive liquid gasket is applied compared to previ ous types when shipped so it should not be forced off the position not specified PBIC3534J Revision July 2007 EM 25 2008 Sentra OIL PAN lt SERVICE INFORMATION gt MR20DE 9
99. all avoiding misalignment of O ring Revision July 2007 EM 26 2008 Sentra OIL PAN lt SERVICE INFORMATION gt MR20DE 4 Tighten bolts in numerical order as shown lt o__ Engine front PBIC3533J 5 Install rear oil seal with the following procedure CAUTION e The installation of rear oil seal should be completed within 5 minutes after installing oil pan upper Always replace rear oil seal with new one e Never touch oil seal lip a Wipe off liquid gasket protruding to the rear oil seal mating part of oil pan upper and cylinder block using a scraper Apply engine oil to entire outside area of rear oil seal Press fit the rear oil seal using a drift with outer diameter 115 mm 4 53 in and inner diameter 90 mm 3 54 in A commer cial service tool PBIC3951E e Press fit to the specified dimensions as shown 0 0 020 in 1 Rear oil seal A Cylinder block rear end surface CAUTION e Never touch the grease applied to the oil seal lip Be careful not to damage the rear oil seal mounting part of oil pan upper and cylinder block or the crankshaft Press fit straight making sure that rear oil seal does not curl or tilt NOTE PBIC3952E The standard surface of the dimension is the rear end surface of cylinder block 6 Install oil pump sprocket oil pump drive chain and other related parts if removed Revision July 2007 EM 27 2008 Sentra OIL PAN lt SERVICE INFORMATION gt MR2
100. all new snap ring to the groove of the piston rear side e Insert it fully into groove to install 17 Assemble piston to connecting rod e Using a suitable tool heat the piston until the piston pin can be pushed in by hand without excess force approximately 60 to 70 C 140 to 158 F From the front to the rear insert piston pin into piston and connecting rod e Assemble so that the front mark A on the piston head and the oil hole B and the cylinder number C on connecting rod are positioned as shown D Big end diameter grade E Small end diameter grade F Front mark connecting rod bearing cap 18 Install new snap ring to the groove of the piston front side e Insert it fully into groove to install e After installing make sure that connecting rod moves smoothly 19 Using a suitable tool install piston rings CAUTION e Be careful not to damage piston Be careful not to damage piston rings by expanding them excessively PBIC3587J Revision July 2007 EM 77 2008 Sentra CYLINDER BLOCK lt SERVIGEINFORMATION gt _EMR200 e Position each ring with the gap as shown referring to the pis ton front mark A Oil ring upper or lower rail gap B Front mark C Second ring and oil ring spacer gap D Top ring gap E Stamped mark CAUTION Never contact the rail end gap under the oil ring with the oil drain cast groove of piston e Install second ring with the stamped surface facing upward PBI
101. allation of Valve Oil Seal eoin oovoddodiadaso7 REMOVAL Remove camshafts Refer to EM 46 Component 2 Remove valve lifters Refer to EM 46 3 Rotate crankshaft and set piston whose valve oil seal is to be removed to TDC This will prevent valve from dropping into cylinder CAUTION When rotating crankshaft be careful to avoid scarring front cover with timing chain 4 Remove valve collet e Compress valve spring using Tool the attachment and the adapter A Remove valve collet with a suitable magnet hand B CAUTION When working be careful not to damage valve lifter holes Tool number KV101092S0 J 26336 B PBIC3727E 5 Remove valve spring retainer valve spring and valve spring seat 6 Remove valve oil seal using Tool A Tool number KV10107902 J 38959 PBIC3728E INSTALLATION 1 Apply new engine oil to valve oil seal joint surface and seal lip 2 Press in valve oil seal to the height H shown using Tool A Height H 15 1 15 7 mm 0 594 0 618 in Tool number KV10115600 PBIC3211J 3 Installation of the remaining components is in the reverse order of removal Removal and Installation of Front Oil Seal INFOID 0000000001849598 REMOVAL 1 Remove the following parts e Front fender protector RH Refer to El 20 Revision July 2007 EM 58 2008 Sentra OIL SEAL lt SERVIGEINFORMATION gt EMR2007 e Drive belt Refer to EM 13 Component e Crankshaft pulley Refer to EM 37 Com
102. amshaft to one direction with hands and measure the camshaft runout on dial indicator Total indicator reading Standard Less than 0 02 mm 0 0008 in Limit 0 05 mm 0 0020 in 4 lf it exceeds the limit replace camshaft Camshaft Cam Height 1 Measure the camshaft cam height with a micrometer A Standard Intake 44 605 44 795 mm 1 7560 1 7635 in Exhaust 43 175 43 365 mm 1 6997 1 7072 in Limit Intake 44 405 mm 1 7482 in Exhaust 42 975 mm 1 6919 in PBIC3178J 2 If it exceeds the limit replace camshaft Camshaft Journal Oil Clearance CAMSHAFT JOURNAL OUTER DIAMETER Measure the outer diameter of camshaft journal with a micrometer A Standard No 1 27 935 27 955 mm 1 0998 1 1006 in No 2 3 4 5 24 950 24 970 mm 0 9823 0 9831 in PBIC3179J CAMSHAFT BRACKET INNER DIAMETER e Tighten camshaft bracket bolts with specified torque Follow the INSTALLATION tightening procedure Revision July 2007 EM 48 2008 Sentra lt CAMSHAFT lt SERVICEINFORMATION gt RODE Measure the inner diameter of camshaft bracket with a bore gauge A B Measuring direction of inner diameter Standard No 1 28 000 28 021 mm 1 1024 1 1032 in No 2 3 4 5 25 000 25 021 mm 0 9843 0 9851 in PBIC3180J CAMSHAFT JOURNAL OIL CLEARANCE Oil clearance Camshaft bracket inner diameter Camshaft journal diameter Standard No 1 0 045 0 086 mm
103. an anano 124 Checking Drive Belts cc cccceeeeeseeeeteeeeeeeees 424 CYLINDER BLOCK sssssssssssrsssrsresnssrnnensnrnnesesans 180 Tension Adjustment vicscacncicnucticeivecsadaseadecseieidessaee 124 Disassembly and Assembly seceeeeereeeerees 180 Removal and Installation c cccecescseseseeeseeeeee 124 How to Select Piston and Bearing 8 188 Removal and Installation of Drive Belt Auto ten Inspection After Disassembly eeeeeeeeee 194 SIQMET AEE E E E TETA TERE A E 125 SERVICE DATA AND SPECIFICATIONS AIR CLEANER AND AIR DUCT eenn 127 OD r ar a ene en 204 Removal and Installation ccccccccccccccccccccccecccutees 127 Standard and Limit 0 0 00 cccccecsseeeeeessseeeeeesneaes 204 EM 2 Revision July 2007 2008 Sentra PRECAUTIONS lt SERVICE INFORMATION gt MR20DE SERVICE INFORMATION PRECAUTIONS Precaution for Supplemental Restraint System SRS AIR BAG and SEAT BELT PRE TENSIONER INFOID 0000000001849588 The Supplemental Restraint System such as AIR BAG and SEAT BELT PRE TENSIONER used along with a front seat belt helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision This system includes seat belt switch inputs and dual stage front air bag modules The SRS system uses the seat belt switches to determine the front air bag deployment and may only deploy one front air bag depending on the severity of a collision a
104. any damage 11 Disconnect intake manifold collector harness and vacuum hose CAUTION Cover engine openings to avoid entry of foreign materials 12 Loosen the bolts in the order shown to remove the intake mani fold assembly using power tools WBIA0863E Inspection After Removal Surface Distortion e Using straightedge and feeler gauge inspect surface distortion of intake manifold surface Limit 0 1 mm 0 004 in INSTALLATION e Install the intake manifold bolts and nuts in the reverse order of removal following the tightening sequences below Tightening Intake Manifold Bolts and Nuts e Tighten in numerical order as shown CAUTION After tightening No 5 retighten the No 1 bolt to specification WBIA0864E Tightening Intake Manifold Support Bolts e Tighten the intake manifold support bolts following the tightening sequence below e Temporarily tighten the intake manifold support rear bolts e Tighten the electronic throttle control actuator bolts e Tighten the intake manifold support rear bolts e Temporarily tighten the intake manifold support front bolts intake manifold side e Tighten the intake manifold support front bolts engine side e Tighten the intake manifold support front bolts intake manifold side Installation of Electronic Throttle Control Actuator e Tighten the mounting bolts of electronic throttle control actuator equally and diagonally in several steps e After installation perfor
105. any open flames e While hoses are disconnected seal their openings with vinyl bag or similar material to prevent foreign material from entering them Remove the intake collector Refer to EM 128 Disconnect sub harness for injector at engine front side and remove it from bracket Revision July 2007 EM 140 2008 Sentra FUEL INJECTOR AND FUEL TUBE lt SERVIGEINFORMATION gt oo O 6 Loosen the bolts in the order as shown then remove fuel tube and fuel injectors as an assembly 7 Remove the fuel injectors from the fuel tube e Release the clip and remove the fuel injector e Pull fuel injector straight out of the fuel tube Be careful not to damage the nozzle e Avoid any impact such as dropping the fuel injector e Do not disassemble or adjust the fuel injector WBIA0875E INSTALLATION 1 Install new O rings on the fuel injector e Lubricate the O rings lightly with new engine oil e Be careful not to scratch O rings during installation Also be careful not to twist or stretch the O ring If the O ring was stretched while it is attached do not insert it into the fuel tube immedi ately 2 Install the fuel injector into the fuel tube with the following proce dure Do not reuse the clip replace it with a new one e Insert the new clip into the clip attachment groove on fuel injector e Insert the clip so that lug A of fuel injector matches notch A of the clip Fuel tube 3 Insert fuel injector i
106. aring Main bearing lower Crankshaft signal plate Flywheel M T 2008 Sentra g CYLINDER BLOCK lt SERVICEINFORMATION gt IRD 1 Remove the engine and transaxle as an assembly from the vehicle and separate the transaxle from the engine Refer to EM 177 Removal and Installation Mount the engine on a suitable engine stand Drain any remaining engine oil and coolant from the engine Remove the following components and associated parts e Exhaust manifold and three way catalyst assembly Refer to EM 132 Removal and Installation e Intake manifold collector Refer to EM 128 Removal and Installation e Intake manifold and fuel tube assembly Refer to EM 128 Removal and Installation Ignition coils Refer to EM 137 Removal and Installation Rocker cover Refer to EM 143 Removal and Installation Front cover timing chain and balancer unit Refer to EM 156 Removal and Installation Cylinder head Refer to EM 168 Removal and Installation Remove the knock sensor CAUTION Carefully handle the sensor and do not drop the sensor Remove crankshaft position sensor POS CAUTION 2 Crankshaft Avoid impacts such as a dropping position Do not disassemble senser POS Keep it away from metal particles Do not place sensor close to magnetic materials CA Engine front ay 6 fg 5 4 7 3 6 9 Always replace 0 55 0 75 after every disassembly 48 64
107. at values with fully warmed up engine are still within specifications 7 Turn crankshaft one complete revolution 360 and align mark on crankshaft pulley with pointer 8 By referring to the figure locations indicated with black arrow No 4 Cylinder TDC measure valve clearances with a feeler gauge at locations marked X as shown in the table below e No 4 cylinder compression TDC Cylinder No 1 No 2 No 3 No 4 Valve INT EXH INT EXH INT EXH INT EXH Measurable Xx x x x Exhaust side Engine front KBIA0249E 9 If out of specifications adjust as follows ADJUSTMENT e Perform adjustment depending on selected head thickness of valve lifter e The specified valve lifter thickness is the dimension at normal temperatures Ignore dimensional differences caused by temperature Use the specifications for hot engine condition to adjust 1 Remove camshaft Refer to EM 145 Removal and Installation 2 Remove the valve lifters at the locations that are outside the standard Revision July 2007 EM 154 2008 Sentra CAMSHAFT lt SERVICE INFORMATION gt 3 ONO Measure the center thickness of the removed valve lifters with a micrometer Micrometer Use the equation below to calculate valve lifter thickness for replacement e Valve lifter thickness calculation t t1 C1 C2 t Thickness of replacement valve lifter t1 Thickness of removed valve lifter C
108. aterials cover them completely with plastic bags or something similar Plastic bags etc PBIC2205E 7 Remove intake manifold Refer to EM 18 Revision July 2007 EM 34 2008 Sentra FUEL INJECTOR AND FUEL TUBE lt SERVIGEINFORMATION gt ooo EMR200 8 Remove fuel tube e Loosen bolts in reverse order as shown lt Engine front PBIC3154J 9 Remove the fuel tube and fuel injector assembly CAUTION When removing be careful to avoid any interference with fuel injector Use a shop cloth to absorb any fuel leaks from fuel tube 10 Remove fuel injector from fuel tube with the following procedure a Open and remove clip b Remove fuel injector from fuel tube by pulling straight CAUTION Be careful with remaining fuel that may go out from fuel tube Be careful not to damage fuel injector nozzle during removal Never bump or drop fuel injector Never disassemble fuel injector INSTALLATION 1 Note the following and install O rings to fuel injector CAUTION Upper and lower O rings are different Be careful not to confuse them Fuel tube side Black Nozzle side Green e Handle O ring with bare hands Never wear gloves e Lubricate O ring with new engine oil e Never clean O ring with solvent Make sure that O ring and its mating part are free of foreign material When installing O ring be careful not to scratch it with tool or fingernails Also be careful not to twist or stretch
109. axle assembly with a hoist and secure the engine in appropriate position Use a manual lift table caddy A or equivalently rigid tool such as a transmission jack Securely support bottom of the engine and the transaxle and simultaneously adjust hoist tension CAUTION Put a piece of wood or something similar as the supporting surface secure a completely stable condition PBIC3223J Remove torque rod RH 1 engine insulator RH 2 and engine bracket RH 3 4 Engine insulator LH A Engine front side B Transaxle side Remove engine through bolt securing nut C WBIA0827E Remove the engine and the transaxle assembly from the vehicle downward by carefully operating sup porting tools CAUTION During the operation make sure that no part interferes with the vehicle side Before and during this lifting always check if any harnesses are left connected During the removal operation always be careful to prevent the vehicle from falling off the lift due to changes in the center of gravity If necessary support the vehicle by setting jack or suitable tool at the rear During operation securely support the engine by placing a piece of wood under the engine oil pan and transaxle oil pan Securely support the engine slingers with a hoist When the engine hoisting is not performed simultaneously install engine slinger to cylinder head front left side and rear right side Remove starter motor Refer
110. by pressing the stopper tab A As a result the slack guide B can be moved 20 Insert stopper pin D into tensioner body hole C to secure tim ing chain slack guide B NOTE Use a hard metal pin with a diameter of approximately 1 2 mm 0 047 in as a stopper pin 21 Remove chain tensioner for oil pump PBIC5314E 22 Remove crankshaft sprocket oil pump sprocket and oil pump drive chain as a set 23 Remove timing chain tension guide front cover side from front cover if necessary INSPECTION AFTER REMOVAL Timing Chain e Check timing chain and oil pump drive chain for cracks A and any excessive wear B at the roller links of timing chain e Replace timing chain and or oil pump drive chain if necessary PBIC3169J INSTALLATION NOTE Revision July 2007 EM 41 2008 Sentra TIMING CHAIN lt SERVICEINFORMATION gt IMR The figure shows the relationship between the matching mark on each timing chain and that on the corresponding sprocket with the components installed 1 Make sure that crankshaft key points straight up Timing chain Camshaft sprocket EXH Timing chain slack guide Timing chain tensioner Oil pump sprocket Oil pump drive chain Chain tensioner for oil pump Crankshaft sprocket OAN DA A O N Timing chain tension guide Camshaft sprocket INT Matching mark dark blue link Matching mark stamping Crankshaft key position straight up Ma
111. cal order as shown See ON Og BO O WBIA0880E Remove the IVT intake valve timing control cover using Tool Tool number KV10111100 J 37228 WBIA0475E 12 Pull chain guide between camshaft sprockets out through front cover 13 Set the No 1 cylinder at TDC on the compression stroke with the following procedure a Rotate the crankshaft pulley clockwise and align the mating marks to the timing indicator on the front cover t A 3 Timing indicator TDC mark OF Q p KBIAO190E b At the same time make sure that the mating marks on the cam Mating mark Mating mark shaft sprockets are lined up as shown Peripheral Stamp If not lined up rotate the crankshaft pulley one more turn to P line line up the mating marks to the positions as shown sprocket 6 INT side eau EXH side KBIAO115E Revision July 2007 EM 157 2008 Sentra a 15 a b 16 Remove timing chain with the following procedure TIMING CHAIN lt SERVICE INFORMATION gt RSE 14 Remove crankshaft pulley with the following procedure Hold the crankshaft pulley using suitable tool then loosen the crankshaft pulley bolt and pull the pulley out about 10 mm 0 39 in Suitable tool Attach suitable pulley puller in the M 6 0 24 in diameter thread hole on crankshaft pulley and remove crankshaft pulley using a suitable puller Remove the front cover with the following
112. cator Dy Rega AO E O N M 1 KBIAO190E Mating mark Peripheral stamp line Mating mark Stamp side KBIAO115E 9 Pull the timing chain guide out between the camshaft sprockets through front cover EM 146 Revision July 2007 2008 Sentra CAMSHAFT lt SERVICE INFORMATION gt 10 11 12 Remove camshaft sprockets with the following procedure CAUTION e Do not rotate the crankshaft or camshaft while the timing chain is removed It causes interference between valve and piston NOTE e Chain tension holding work is not necessary Crankshaft sprocket and timing chain do not disconnect structurally while front cover is attached Line up the mating marks on camshaft sprockets with the yellow links in the timing chain and paint an indelible mating mark on the sprocket and timing chain link plate Push in the tensioner plunger and hold Insert a stopper pin into the hole on tensioner body to hold the chain tensioner Remove the timing chain tensioner e Use a wire with 0 5 mm 0 02 in diameter for a stopper pin Secure the hexagonal part of camshaft with a suitable tool Loosen the camshaft sprocket mounting bolts and remove the camshaft sprockets Loosen the camshaft bracket bolts in the order as shown and remove the camshaft brackets and camshafts e Remove No 1 camshaft bracket by slightly tapping it with a rubber mallet Remove the valve lifters e Check mounting position
113. ch function inspection after finishing work If DTC is detected perform trouble diagnosis according to self diagnostic results For models equipped with the Intelligent Key system and NATS an electrically controlled steering lock mech anism is adopted on the key cylinder For this reason if the battery is disconnected or if the battery is discharged the steering wheel will lock and steering wheel rotation will become impossible If steering wheel rotation is required when battery power is interrupted follow the procedure below before starting the repair operation OPERATION PROCEDURE 1 Connect both battery cables NOTE Supply power using jumper cables if battery is discharged Revision July 2007 EM 3 2008 Sentra PRECAUTIONS lt SERVICE INFORMATION gt MR20DE 2 Use the Intelligent Key or mechanical key to turn the ignition switch to the ACC position At this time the steering lock will be released 3 Disconnect both battery cables The steering lock will remain released and the steering wheel can be rotated 4 Perform the necessary repair operation 5 When the repair work is completed return the ignition switch to the LOCK position before connecting the battery cables At this time the steering lock mechanism will engage 6 Perform a self diagnosis check of all control units using CONSULT III Precaution for Drain Coolant INFOID 000000000 1849562 e Drain coolant when engine is cooled Preca
114. cover Camshaft Camshaft journal oil EM 46 Cylinder Rattle C A A B C bearing clearance EM 46 head noise Camshaft runout Piston to piston pin oil Slap or _ A _ B B _ Piston pin clearance EM 88 knock noise Connecting rod bushing EM 88 oil clearance Piston to cylinder bore Crank clearance EM 88 shaft pul Slap or A _ _ B B a Piston Heats ring side clear EM 88 ley rap slap noise EM 88 Cylinder Piston ring end gap EM 88 block Connecting rod bend m Side of and torsion a Connect Connecting rod bushing pan ing rod oil clearance EM 88 Knock A B C B p p bearing Connecting rod bearing EM 88 noise oil clearance Main bearing oil clear Knock A B A B c eee ance ee g Crankshaft runout Front of Timing Timing chain cracks p Tappi chain and nd wear engine appingor A A B B B chain ten 2 l EM 38 Front cov ticking sioner Timing chain tensioner er i operation noise Drive belt Squeak Sticking ing or fizz A B B C or slip Drive belt deflection Ing ping EM 13 Front of Drive belt Idler pulley bearing op engine Creaking A B A B A B Slipping araen y g op Squall Water q A B B A B pump Water pump operation CO 17 Creak noida A Closely related B Related C Sometimes related Not related Revision July 2007 EM 12 2008 Sentra DRIVE BELTS lt SERVICEINFORMATION gt IMO EY DRIVE BELTS Co m p O n e nt INFOID 0000000001849573 PBIC3137J 1 Generator 2 Drive belt auto
115. ctions of engine harness around the engine mounting insulator LH and then tem porarily secure the engine harness into the engine side CAUTION Protect connectors using a resin bag to protect against foreign materials during the operation Disconnect fuel feed hose at engine side Refer to EM 33 Component Disconnect heater hoses and install plugs them to prevent engine coolant from draining Refer to CO 22 Component Disconnect control cable from transaxle Refer to CVT 171 CVT MT 14 Removal and Installation MT Remove ground cable at transaxle side Remove ground cable between front cover and vehicle Remove generator Refer to SC 23 Remove A C compressor with piping connected from the engine Temporarily secure it on the vehicle side with a rope to avoid putting load on it Refer to MTC 85 Removal and Installation for Compressor MR20DE Remove the intake manifold to prevent the hanging chain from interfering Refer to EM 18 Component Revision July 2007 EM 100 2008 Sentra 27 28 29 30 31 32 33 34 35 ENGINE ASSEMBLY lt SERVIGEINFORMATION gt R20 26 Install engine slinger to cylinder head front left side A and rear right side B and support the engine position with a hoist lt 1 Engine front Slinger bolts front 32 9 N m 3 3 kg m 24 2 ft lb Slinger bolts rear 25 0 N m 2 5 kg m 18 4 ft lb LBIAO461E Support engine and trans
116. cylinder block main bearing housing inner diameter and crankshaft main journal diameter individually Refer to EM 88 Inspection After Disassembly and EM 88 Inspection After Disassembly Apply the measured dimension to the Main Bearing Selection Table Read the symbol at the cross point of selected row and column in the Main Bearing Selection Table CAUTION There are two main bearing selection tables One is for No 1 4 and 5 journals and the other is for No 2 and 3 journals Make certain to use the appropriate table This is due to differences in the specified clearances Apply the symbol obtained to the Main Bearing Grade Table to select main bearing NOTE Revision July 2007 EM 85 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt Service part is available as a set of both upper and lower Main Bearing Selection Table No 1 4 and 5 journals Crankshaft main journal diameter Unit mm in Mark A Cylinder block main bearing housing inner diameter Unit mm in Hole diameter Axle diameter B Cc D 56 000 2 2047 2 2047 56 001 2 2047 2 2048 E F G H J K a t oS N a D t N N x wo Qo a oO re t e 3 oO Ww 56 005 56 006 2 2049 2 2050 56 006 56 007 2 2050 2 2050 S T U v Ww 56 008 56 009 2 2050 2 2051 56 009 56 010 2 2051 2 2051 56 010 56 011 2 2051 2 2052 56 01
117. d Press fit the spark plug tube into the cylinder head using the following procedure Remove old sealant from cylinder head side installation hole Apply sealant all round on spark plug tube within approximately 12 mm 0 47 in width from edge of spark plug tube on the press fit side Use Genuine High Strength Locking Sealant or equivalent Refer to GI 42 Recommended Chemical Product and Seal High strength ant locking sealant Press fit the spark plug tube to specified height H as shown application arpa using suitable tool eae Standard press fit height H 41 2 42 2 mm 1 622 1 661 in CAUTION When press fitting be careful not to deform spark plug tube After press fitting wipe off any protruding sealant on top surface of cylinder head 10 Install spark plug Refer to EM 138 Inspection After Disassembly INFOID 0000000001849647 CYLINDER HEAD DISTORTION 1 VALVE DIMENSIONS Check dimensions of each valve Refer to EM 204 Standard and Limit Wipe off oil and remove water scale deposits old gasket old sealer and carbon with a scraper CAUTION Use care not to allow gasket debris to enter passages for oil or water At each of several locations on bottom surface of cylinder head measure distortion in six directions Limit 0 1 mm 0 004 in or less an Feeler gauge NAAN PBICOO75E SEM188A VALVE GUIDE CLEARANCE Perform this inspection before removing the valve gu
118. d by Calculation MAIN BEARING OIL CLEARANCE Method by Calculation e Install main bearings 3 to cylinder block 1 and main bearing cap 2 and tighten main bearing cap bolts to the specified torque Refer to EM 72 Disassembly and Assembly for the tightening procedure A Example B Inner diameter measuring direction e Measure the inner diameter of main bearing with a bore gauge Bearing oil clearance Main bearing inner diameter Crank shaft main journal diameter PBIC3277J Standard No 1 4 and 5 journals 0 024 0 034 mm 0 0009 0 0013 in No 2 and 3 journals 0 012 0 022 mm 0 0005 0 0009 in Limit 0 065 mm 0 0026 in Revision July 2007 EM 95 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt MR20DE e If clearance exceeds the limit select proper main bearing according to main bearing inner diameter and crankshaft main journal diameter to obtain specified bearing oil clearance Refer to EM 80 How to Select Piston and Bearing Method of Using Plastigage e Remove engine oil and dust on crankshaft main journal and the surfaces of each bearing completely Cut a plastigage slightly shorter than the bearing width and place it in crankshaft axial direction avoiding oil holes Install main bearings to cylinder block and main bearing cap and tighten main bearing cap bolts to the spec ified torque Refer to EM 72 Disassembly and Assembly for the tightening proced
119. de No A 58 944 58 945 2 3206 2 3207 Grade No B 58 945 58 946 2 3207 2 3207 Grade No C 58 946 58 947 2 3207 2 3207 Grade No D 58 947 58 948 2 3207 2 3208 Grade No E 58 948 58 949 2 3208 2 3208 Grade No F 58 949 58 950 2 3208 2 3209 Grade No G 58 950 58 951 2 3209 2 3209 Grade No H 58 951 58 952 2 3209 2 3209 Grade No J 58 952 58 953 2 3209 2 3210 Grade No K 58 953 58 954 2 3210 2 3210 Mai iourmalinner Grade No L 58 954 58 955 2 3210 2 3211 ed fade Grade No M 58 955 58 956 2 3211 2 3211 Without a Grade No N 58 956 58 957 2 3211 2 3211 g Grade No P 58 957 58 958 2 3211 2 3212 Grade No R 58 958 58 959 2 3212 2 3212 Grade No S 58 959 58 960 2 3212 2 3213 Grade No T 58 960 58 961 2 3213 2 3213 Grade No U 58 961 58 962 2 3213 2 3213 Grade No V 58 962 58 963 2 3213 2 3214 Grade No W 58 963 58 964 2 3214 2 3214 Grade No X 58 964 58 965 2 3214 2 3215 Grade No Y 58 965 58 966 2 3215 2 3215 Grade No 4 58 966 58 967 2 3215 2 3215 Grade No 7 58 967 58 968 2 3215 2 3216 Difference in inner diameter between Standard Less than 0 03 0 0012 cylinders PISTON PISTON RING AND PISTON PIN Available Piston EM 209 Revision July 2007 SERVICE DATA AND SPECIFICATIONS SDS lt SERVICE INFORMATION gt QR25DE Unit
120. de of and torsion engine Connect Connecting rod bushing Oil pan ing rod clearance Small end EM 194 Knock A B g 2 B B bearing Connecting rod bearing EM 194 noise clearance Big end Main bearing oil clear Knock A B A B c Main bear ance ET 9 Crankshaft runout tront of Timing Timing chain cracks engine chain and Timing Tapping or A A B B B chairi ten and wear EM 156 ticking Timing chain tensioner chain cov sioner oper ton er noise P Drive belts Squeak Sticking i ing or fizz A B B B or slip Drive belts deflection ing ping EM 124 Front of i Drive belts Idler pulley bearing op engine Creaking A B A B A B Slipping paar y g Op Squall Water Creak A B B A B Pap Water pump operation CO 33 A Closely related B Related C Sometimes related Not related EM 123 Revision July 2007 2008 Sentra DRIVE BELTS lt SERVIGEINFORMATION gt IRS DET DRIVE BELTS Checking Drive Belts INFOID 000000000 1849625 SEC 117 1 Generator pulley 2 Water pump pulley 3 Drive belt auto tensioner 4 Idler pulley 5 Crankshaft pulley 6 A C compressor pulley A Allowable use range new belt B ViewB C Allowable use range D Indicator notch E Temporary retaining boss WARNING NOTE the drive belt only when the engine is stopped On vehicles not equipped with A C there is an idler pulley in the position for the drive belt routing e Make sure that the stamp mark of drive belt auto ten
121. dicated with black arrow with a feeler gauge e No 1 cylinder compression TDC Measuring position No 1 CYL No 2 CYL No 3 CYL No 4 CYL No 1 cylinder at EXH x compression TDC INT x x A Exhaust side Baicsisai B No 1 cylinder C No 2 cylinder D No 3 cylinder E No 4 cylinder F Intake side lt Engine front c Set No 4 cylinder at TDC of its compression stroke Revision July 2007 EM 55 2008 Sentra CAMSHAFT lt SERVIGEINFORMATION gt TT _EMR200 e Rotate crankshaft pulley 1 one revolution 360 degrees and align TDC mark no paint B to timing indicator A on front cover C White paint mark Not use for service PBIC3960E e By referring to the figure measure the valve clearance at loca tions marked x as shown in the table below locations indi cated with black arrow with a feeler gauge e No 4 cylinder compression TDC Measuring position No 1 CYL No 2 CYL No 3 CYL No 4 CYL No 4 cylinder at EXH x x compression TDC INT x x Exhaust side PBIC3194J No 1 cylinder No 2 cylinder No 3 cylinder No 4 cylinder 7aMmMoOD gt Intake side lt x Engine front 3 If out of standard perform adjustment ADJUSTMENT e Perform adjustment depending on selected head thickness of valve lifter 1 Remove camshaft Refer to EM 46 Removal and Installation Remove valve lifters at
122. e PBIC3176J 6 Tighten all bolts in numerical order in three steps Step 1 1 96 N m 0 20 kg m 17 in Ib Step 2 5 88 N m 0 60 kg m 52 in Ib Step 3 9 5 N m 0 97 kg m 84 in Ib 7 Install the camshaft sprocket INT to the camshaft INT NOTE When the camshaft sprocket INT 2 is removed align the paint mark A put according to step 3 Securely align the knock pin and the pin hole and then install them 1 Camshaft bracket lt Engine front 8 Tighten camshaft INT sprocket bolt Camshaft sprocket bolt INT 35 0 N m 3 6 kg m 26 ft lb NOTE Secure the hexagonal part of camshaft INT using wrench to tighten bolt 9 Turn 67 degrees clockwise angle tightening using Tool 1 Camshaft sprocket INT A Camshaft INT hexagonal part CAUTION Never judge by visual inspection without an angle wrench Tool number KV10112100 BT 8653 A PBIC3455J Revision July 2007 EM 52 2008 Sentra CAMSHAFT lt SERVICEINFORMATION gt MRO 10 Install camshaft sprocket EXH 2 1 Camshaft sprocket INT Camshaft sprocket bolt EXH NOTE Secure the hexagonal part A of camshaft EXH using wrench to tighten bolt 88 2 N m 9 0 kg m 65 ft Ib PBIC3454J 11 Install timing chain and related parts Refer to EM 37 12 Inspect and adjust valve clearance Refer to EM 54 Valve Clearance 13 Installation of the remaining components is in the reverse order of removal
123. e Inspection for double mass flywheel only Do not disassemble double mass flywheel Flywheel Deflection e Measure deflection of flywheel contact surface to the clutch with a dial gauge e Measure runout at 210 mm 8 27 in dia Limit 0 45 mm 0 0177 in or less under no load e Measure axial displacement at 250 mm 9 84 in dia Limit 1 3 mm 0 051 in or less under 100N 22 48 Ib force e When measured value exceeds the limit replace the flywheel with a new one SBIA0287E Movement Amount in Rotation Direction e Check the movement amount in the following procedure 1 Install a bolt to clutch cover mounting hole and place a torque wrench on the extended line of the flywheel center line e Tighten bolt to keep it from loosening at a force of 9 8 N m 1 kg m 87 in lb Revision July 2007 EM 202 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt QR25DE 2 Put a mating mark on circumferences of the two flywheel masses without applying any load measurement standard ganm oe points 1 0 kg m ff 9 8 Nem 87 in Ib AJB 1 0 kg m 87 in Ib Clutch cover mounting bolt Flywheel 3 Apply a force of 9 8 N m 1 kg m 87 in lb in each direction and mark the movement amount on the mass on the transmission side transmission 4 Measure dimensions of movement amounts A and B on circum side ference of the flywheel on the transmission side Standard 35 mm 1 38 in or less e When measured value is out
124. e again If some cylinder has low compression pressure pour small amount of engine oil into the spark plug hole of the cylinder to re check it for compression If the added engine oil improves the compression piston rings may be worn out or damaged Check pis ton rings and replace if necessary If the compression pressure remains at low level despite the addition of engine oil valves may be mal functioning Check valves for damage Replace valve or valve seat accordingly If two adjacent cylinders have respectively low compression pressure and their compression remains low even after the addition of engine oil cylinder head gasket is leaking In such a case replace cylinder head gasket 9 After inspection is completed install removed parts 10 Start the engine and confirm that the engine runs smoothly 11 Perform trouble diagnosis If DTC appears erase it Refer to EC 86 Co m po n e nt INFOID 0000000001849601 SEC 111 ko Nem kg m ft lb PBIC3542J 1 Cylinder head assembly 2 Cylinder head bolt 3 Cylinder head gasket A Refer to EM 62 Re m oval a nd n stal lat i O n INFOID 0000000001849602 REMOVAL WARNING e Put a CAUTION FLAMMABLE sign in the workshop Be sure to work in a well ventilated area and furnish workshop with a CO2 fire extinguisher Do not smoke while servicing fuel system Keep open flames and sparks away from the work area Release the fuel pressure Refer to EC 83 Fuel Pr
125. e oil and remove water scale like deposit gasket sealant carbon etc with a scraper CAUTION Use utmost care not to allow gasket debris to enter passages for engine oil or water 2 At each of several locations on bottom surface of cylinder head measure the distortion in six directions using straightedge A and feeler gauge B Limit 0 1 mm 0 004 in e If it exceeds the limit replace cylinder head PBIC3207J INSTALLATION 1 Install cylinder head gasket 2 Apply new engine oil to threads and seating surface of bolts CAUTION If cylinder head bolts re used check their outer diameters before installation Follow the Cylinder Head Bolts Outer Diameter procedure Revision July 2007 EM 63 2008 Sentra CYLINDER HEAD lt SERVIGEINFORMATION gt EMRE 3 Install cylinder head follow the steps below to tighten cylinder head bolts in numerical order as shown Step a 40 N m 4 1 kg m 30 ft lb Step b 100 clockwise Step c Loosen to 0 N m in the reverse order of tight ening Step d 40 N m 4 1 kg m 30 ft lb Step e 100 clockwise Step f 100 clockwise lt 2 Engine front CAUTION Check and confirm the tightening angle by using Tool A or protractor Never judge by visual inspection without the tool Tool number KV10112100 BT 8653 A PBIC3208J 4 Installation of the remaining components is in the reverse order of removal Co m po n e nt INFOID 0000000001849603 SEC 111 130
126. e tensioner is fully released 7 Install chain guide 8 Install IVT control cover with the following procedure a Install IVT control solenoid valve to intake valve timing control cover b Install O ring to front cover side c Apply Genuine Silicone RTV Sealant to the positions as shown Refer to GI 42 Recommended Chemical Product and Sealant WBIA0882E d Install IVT control cover e Tighten the bolts in the numerical order as shown 9 Check and adjust valve clearances Refer to EM 153 Valve Clearance 10 Installation of the remaining components is in the reverse order of removal WBIA0883E Inspection After Installation INFOID 0000000001 849638 Inspection of Camshaft Sprocket INT Oil Groove CAUTION e Perform this inspection only when DTC P0011 is detected in self diagnostic results of CONSULT III and it is directed according to inspection procedure of EC section Refer to EC 653 e Check when engine is cold so as to prevent burns from any splashing engine oil 1 2 a Check engine oil level Refer to LU 15 Inspection Perform the following procedure so as to prevent the engine from being unintentionally started while checking Release fuel pressure Refer to EC 592 Fuel Pressure Check Disconnect ignition coil and injector harness connectors if practical Remove IVT control solenoid valve Refer to EM 145 Revision July 2007 EM 152 2008 Sentra CAMSHAFT lt SERVIGEINFORMATION gt ISDE
127. eakage Level Fuel Leakage Leakage Leakage Exhaust gases Leakage Transmission transaxle CVT fluid power steering fluid brake fluid etc Inspection of Camshaft Sprocket INT Oil Groove CAUTION Perform this inspection only when DTC P0011 is detected in self diagnostic results of CONSULT III and it is directed according to inspection procedure of EC section Refer to EC 50 Check when engine is cold so as to prevent burns from the splashing engine oil 1 Check engine oil level Refer to LU 5 Inspection 2 Perform the following procedure so as to prevent the engine from being unintentionally started while checking a Remove intake manifold Refer to EM 18 Component Disconnect ignition coil and injector harness connectors 3 Remove intake valve timing control solenoid valve Refer to EM 37 Component o Revision July 2007 EM 53 2008 Sentra CAMSHAFT lt SERVICEINFORMATION gt _IMR20E 4 Clean the mating area of intake valve timing control solenoid valve Insert a clean shop cloth with no oil adhesion into the oil hole A of the cylinder head 1 Front cover lt m Vehicle front 5 Install engine mounting bracket RH engine mounting insulator and torque rod RH under the Step 4 condition With intake valve timing control solenoid valve removed and a shop cloth inserted into the oil hole Refer to EM 99 Component WalAgv ie 6 Crank engine and then make s
128. ear oil seal SBIA0281E 2 Installation of the remaining components in reverse order of removal Revision July 2007 EM 166 2008 Sentra lt CYLINDER HEAD lt SERVIGEINFORMATION gt ooo QRRSDE CYLINDER HEAD O n Ve h i C e Se rv i ce INFOID 0000000001849644 CHECKING COMPRESSION PRESSURE 1 2 3 Warm up the engine to full operating temperature Release the fuel pressure Refer to EC 592 Fuel Pressure Check Remove the ignition coil and spark plug from each cylinder Refer to EM 138 Removal and Installation Connect engine tachometer not required in use of CONSULT III Disconnect the fuel injector harness connector to avoid any residual fuel injection during the measure ment Install the compression tester with the adapter into the spark plug hole KBIA0130E Use compression gauge whose picking up end inserted to spark plug hole is smaller than 20 mm 0 79 in in diameter Otherwise it may be caught by cylinder head during removal 20 mm 0 79 in dia Use compressor tester whose end rubber portion is less than 20 mm 0 79 in dia Otherwise it may be caught by cylinder head during removal SEM387C 7 With the accelerator pedal fully depressed turn the ignition switch to the START position to crank over the engine When the gauge pointer stabilizes read the compression pressure and engine rpm Perform these steps to check each cylinder Unit kPa kg cm psi r
129. ed refer to EM 66 Inspection After Disassembly to removal ASSEMBLY 1 2 Install valve guide if removed Refer to EM 66 Inspection After Disassembly Install valve seat if removed Refer to EM 66 Inspection After Disassembly Revision July 2007 EM 65 2008 Sentra CYLINDER HEAD lt SERVICE INFORMATION gt EMRE 3 Install valve oil seal e Install with a valve oil seal using Tool A to match dimension as shown Tool number KV10115600 J 38958 NOTE Dimension H is height that measured before installing valve spring with valve spring seat Height H 15 1 15 7 mm 0 594 0 618 in PBIC3211J 4 Install valve e Install larger diameter to intake side 5 Install valve spring with valve spring seat e Install smaller pitch valve spring seat side to cylinder head side B e Confirm identification color A of valve spring 1 Valve spring seat Do not remove from valve spring Intake White Exhaust Orange PBIC3462J 6 Install valve spring retainer 7 Install valve collet e Compress valve spring using Tool A Install valve collet with a magnet hand Tool number KV101092S0 J 26336 B CAUTION When working be careful not to damage valve lifter holes e Tap valve stem edge lightly with a plastic hammer after instal lation to check its installed condition PBIC3209J 8 Install valve lifter e Install it in the original position 9 Install spark plu
130. emove the A F sensor 1 using Tool A Tool number KV991J0050 J 44626 CAUTION Handle it carefully and avoid impacts WBIA0772E 4 Remove exhaust manifold side bolt of exhaust manifold stay Revision July 2007 EM 21 2008 Sentra EXHAUST MANIFOLD lt SERVIGEINFORMATION gt _EMR200 5 Loosen nuts in reverse order as shown and remove exhaust manifold lt Engine front CAUTION Cover engine openings to avoid entry of foreign materials INSPECTION AFTER REMOVAL Surface Distortion e Using straightedge B and feeler gauge A check the surface dis tortion of exhaust manifold mating surface in each exhaust port and entire part Limit Each exhaust port 0 3 mm 0 012 in Entire part 0 7 mm 0 028 in If it exceeds the limit replace exhaust manifold PBIC3530J INSTALLATION 1 Install exhaust manifold gasket to cylinder head as shown lt o__ Engine front PBIC3943E 2 Tighten exhaust manifold nuts to specification in two stages in the numerical order as shown lt o__ Engine front PBIC3529J Revision July 2007 EM 22 2008 Sentra EXHAUST MANIFOLD lt SERVICEINFORMATION gt EMRE 3 Install exhaust manifold stay 2 in the direction as shown 1 Exhaust manifold A Upper mark lt Engine front PBIC3944E 4 Install the A F ratio sensor 1 using Tool Tool number KV991J0050 J 44626 CAUTION Handle it carefully and avoid impacts e Before installing a
131. en removing them note the installation position Keep them in the correct order 11 Remove the piston rings from the piston e Use a piston ring expander CAUTION When removing the piston rings be careful not to damage the piston Be careful not to damage piston rings by expanding them excessively if reusing them e Before removing the piston rings check the piston ring side clearance Refer to EM 194 Inspection After Disassembly PBICO087E 12 Remove the piston from the connecting rod as follows a Using a snap ring pliers remove the two snap rings PBICO260E b Heat the piston to 60 70 C 140 158 F with a heat gun or equivalent Heat gun PBICO261E Revision July 2007 EM 182 2008 Sentra CYLINDER BLOCK lt SERVIGE INFORMATION gt RSD c Push out piston pin with a punch of an outer diameter of approx imately 19 mm 0 75 in 13 Remove the lower cylinder block bolts e Before loosening the lower cylinder block bolts measure the crankshaft side clearance Refer to EM 194 Inspection After Disassembly e Loosen them in the order as shown to remove them Engine WBIA0037E 14 Remove the lower cylinder block e Cut the Silicone RTV Sealant and remove the lower cylinder block from the cylinder block using Tool Seal cutter KV10111100 J 37228 CAUTION Be careful not to damage the mounting surface 15 Remove the crankshaft CAUTION Crankshaft Do not damage or deform t
132. eplace connecting rod assembly CONNECTING ROD BEARING BIG END e Install the connecting rod cap without the connecting rod bearing installed After tightening the connecting rod bolt to the specified torque measure the connecting rod big end inner diameter using an inside micrometer Refer to EM 204 Standard and Limit CONNECTING ROD BUSHING OIL CLEARANCE SMALL END Inner Diameter of Connecting Rod Small End e Measure inner diameter of bushing Refer to EM 204 Standard and Limit Outer Diameter of Piston Pin e Measure outer diameter of piston pin Refer to EM 204 Standard and Limit Connecting Rod Bushing Oil Clearance Small End Revision July 2007 EM 197 QR25DE SEM038F Inside micrometer PBICO119E Inside micrometer PBICO120E PBICO117E 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt Connecting rod small end oil clearance Inner diameter of con necting rod small end Outer diameter of piston pin Standard 0 005 0 017 mm 0 0002 0 0007 in e If the measured value exceeds the standard replace the connect ing rod assembly and or piston and piston pin assembly e If replacing the piston and piston pin assembly use the Piston Selection Table to select the piston corresponding to the applica ble bore grade of the cylinder block to be used Refer to EM 188 How to Select Piston and Bearing Factory Installed Parts Grading e Service parts
133. er Timing chain slack guide Chain guide Crankshaft pulley bolt Balancer unit timing chain tensioner Timing chain tension guide Refer to INSTALLATION EM 156 CAUTION Apply new engine oil to parts marked in illustration before installation REMOVAL 1 Support the engine and transaxle assembly with suitable tools 2 Remove RH splash shield Revision July 2007 I 6 9 0 70 TIMING CHAIN AD oo gt ga 0 16 5 1 7 12 9 13 1 3 10 11 14 17 20 0 16 5 1 7 12 Camshaft sprocket INT Spring Timing chain IVT solenoid valve Crankshaft pulley Oil pump drive spacer Balancer unit timing chain Refer to INSTALLATION EM 156 EM 156 12 15 18 21 QR25DE INFOID 000000000 1849640 Camshaft sprocket EXH Chain tensioner plunger Front cover IVT cover Front oil seal Crankshaft sprocket Balancer unit 2008 Sentra TIMING CHAIN lt SERVICE INFORMATION gt QR25DE Remove the upper and lower oil pan and oil strainer Refer to EM 134 Removal and Installation Remove generator Refer to SC 30 Removal and Installation QR25DE Remove engine cover Disconnect variable timing control solenoid harness connector eM Remove engine ground Remove the coolant overflow reservoir tank Position the RH engine compartment fuse and relay box aside Remove the RH engine mount and bracket Refer to EM 177 Removal and Installation Loosen bolts in the numeri
134. er place sensor in a location where it is exposed to magnetism 31 Install oil filter for intake valve timing control 1 in the direction shown e Make sure that the oil filter does not protrude from the upper surface of cylinder block 2 after installation PBIC3260J 32 Assemble in the reverse order of disassembly How to Select Piston and Bearing inFo10 0000000001649608 DESCRIPTION Revision July 2007 EM 80 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt Selection points Selection parts Selection items MR20DE Selection methods Between cylinder block and crankshaft Main bearing Main bearing grade bearing thickness Determined by match of cylin der block bearing housing grade inner diameter of hous ing and crankshaft journal grade outer diameter of jour nal Between crankshaft and con necting rod Connecting rod bearing Connecting rod bearing grade bearing thickness Combining service grades for connecting rod big end diame ter and crankshaft pin outer di ameter determine connecting rod bearing selection Between cylinder block and pis ton e The identification grade stamped on each part is the grade for the dimension measured in new condition Piston and piston pin assembly piston is available together with piston pin as an assembly This grade cannot apply to reused parts e For reused or repaired parts measure the dimension accurate
135. essure Check Drain engine coolant and engine oil Refer to CO 11 and LU 6 Changing Engine Oil Remove front fender protector RH Refer to El 20 Remove drive belt Refer to EM 13 Removal and Installation Remove the following components and related parts e Exhaust manifold Refer to EM 21 e Intake manifold Refer to EM 18 e Fuel tube and fuel injector assembly Refer to EM 33 eN Revision July 2007 EM 62 2008 Sentra CYLINDER HEAD lt SERVIGEINFORMATION gt 0 EMR2007 Water outlet Refer to CO 22 Rocker cover Refer to EM 30 e Front cover timing chain Refer to EM 37 Camshaft Refer to EM 46 6 Remove cylinder head Loosen bolts in reverse order as shown lt 2 Engine front e Using TORX socket size E18 loosen cylinder head bolts 7 Remove cylinder head gasket PBIC3206J INSPECTION AFTER REMOVAL Cylinder Head Bolts Outer Diameter e Cylinder head bolts are tightened by plastic zone tightening method Whenever the size difference between di and d2 exceeds the limit replace them with a new one Limit d1 d2 0 15 mm 0 0059 in e If reduction of outer diameter appears in a position other than d2 use it as d2 point 1 77 in PBIC3994E Cylinder Head Distortion NOTE When performing this inspection cylinder block distortion should be also checked Refer to EM 88 Inspection After Disassembly 1 Wipe off engin
136. etween X and Y nee 0 015 0 0006 imi Taper Difference between A and C 0 01 0 0004 Grade No A 55 997 55 998 2 2046 2 2046 Grade No B 55 998 55 999 2 2046 2 2047 Grade No C 55 999 56 000 2 2047 2 2047 Grade No D 56 000 56 001 2 2047 2 2048 Grade No E 56 001 56 002 2 2048 2 2048 Grade No F 56 002 56 003 2 2048 2 2048 Grade No G 56 003 56 004 2 2048 2 2049 Grade No H 56 004 56 005 2 2049 2 2049 Grade No J 56 005 56 006 2 2049 2 2050 Main bearing housing inner diameter grade Grade No K 38 006 96 007 22050 2 2050 Grade No L 56 007 56 008 2 2050 2 2050 Grade No M 56 008 56 009 2 2050 2 2051 Grade No N 56 009 56 010 2 2051 2 2051 Grade No P 56 010 56 011 2 2051 2 2052 Grade No R 56 011 56 012 2 2052 2 2052 Grade No S 56 012 56 013 2 2052 2 2052 Grade No T 56 013 56 014 2 2052 2 2053 Grade No U 56 014 56 015 2 2053 2 2053 Grade No V 56 015 56 016 2 2053 2 2053 Grade No W 56 016 56 017 2 2053 2 2054 PISTON PISTON RING AND PISTON PIN Available Piston EM 108 2008 Sentra Revision July 2007 SERVICE DATA AND SPECIFICATIONS SDS lt SERVICE INFORMATION gt MR20DE Unit mm in Cs H A PBICO188E eee tr eee Standarg CENO 83 970 83 980 3 3059 3 3063 Grade No 2 83 980 83 990 3 3063 3 3
137. for the camshaft position sensor PHASE Exhaust Cone end shape WBIA0881E e Install camshafts so that the dowel pins on the front side are positioned as shown aA f KBIA0051E 3 Install camshaft brackets e Install by referring to identification mark on upper surface mark Intake side e Install so that identification mark can be correctly read when viewed from the exhaust side al Bi c l Engine Exhaust side front SBIAO256E Revision July 2007 EM 150 2008 Sentra CAMSHAFT lt SERVICE INFORMATION gt RSD e Install No 1 camshaft bracket as follows Apply sealant to No 1 camshaft bracket as shown e Use Genuine Silicone RTV Sealant or equivalent Refer to GI 42 Recommended Chemical Product and Sealant 10 5 mm CAUTION Otsin After installation be sure to wipe off any excessive seal TL he Re ys ant leaking from part A both on right and left sides _ Ne L J 2 0 3 0 mm 0 079 0 118 in dia A Both SBIA0257E e Apply sealant to camshaft bracket contact surface on the front cover backside e Apply sealant to the outside of bolt hole on front cover Front cover G4 142 in di Q f InN are LN OLN AN a 6 mm 0 SBIA0258E e Position the No 1 camshaft bracket near the mounting posi Brane tion and install it without disturbing the sealant applied to the No d camehait surfaces bracket Front cover Liquid gasket application face a Apply Genuine
138. front side to the crank shaft rear surface Apply new engine oil to threads and seat surfaces of bolts Position crankshaft 2 and signal plate 1 using a dowel pin service part and tighten bolts in numerical order as shown A Dowel pin hole NOTE Dowel pin of crankshaft and signal plate is provided as a set for each 10 Tighten bolts in numerical order as shown 11 Remove dowel pin service parts CAUTION Be sure to remove dowel pin 12 Install crankshaft to cylinder block e While turning crankshaft by hand make sure that it turns smoothly PBIC3238J 13 Install main bearing caps referring to the journal No stamp A and front mark B as shown lt Engine front NOTE Main bearing cap cannot be replaced as a single part because it is machined together with cylinder block PBIC3239J 14 Apply new engine oil to threads and seat surfaces of bolts Revision July 2007 EM 76 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt MR20DE 15 Tighten main bearing cap bolts in two steps NOTE Tighten main bearing cap bolts in numerical order as shown lt Engine front Step 1 34 3 N m 3 5 kg m 25 ft lb Step2 60 clockwise Tool number KV10112100 BT 8653 A PBIC3240J e After installing bolts make sure that crankshaft can be rotated smoothly by hand e Check crankshaft end play Refer to EM 88 Inspection After Disassembly 16 Using snap ring pliers inst
139. g using suitable tool Inspection After Disassembly InFo10 0000000001849605 VALVE DIMENSIONS e Check dimensions of each valve For dimensions refer to EM 103 Standard and Limit e If dimensions are out of the standard replace valve VALVE GUIDE CLEARANCE Valve Stem Diameter Revision July 2007 EM 66 2008 Sentra CYLINDER HEAD lt SERVICE INFORMATION gt MIRE Measure the diameter of valve stem with a micrometer A Standard Intake 5 465 5 480 mm 0 2152 0 2157 in Exhaust 5 455 5 470 mm 0 2148 0 2154 in PBIC3213J Valve Guide Inner Diameter Measure the inner diameter of valve guide with a bore gauge Standard 5 500 5 518 mm 0 2165 0 2172 in Valve Guide Clearance Valve guide clearance Valve guide inner diameter Valve stem diameter Valve guide clearance Standard Intake 0 020 0 053 mm 0 0008 0 0021 in Exhaust 0 030 0 063 mm 0 0012 0 0025 in Limit 0 1 mm 0 004 in e If it exceeds the limit replace valve guide and or valve VALVE GUIDE REPLACEMENT When valve guide is removed replace with oversized 0 2 mm 0 008 in valve guide 1 To remove valve guide heat cylinder head to 110 to 130 C 230 to 266 F by soaking in heated oil A PBIC3214J 2 Drive out valve guide using suitable tools CAUTION Cylinder head contains heat when working wear protective equipment to avoid getting burned Revision July 2007 EM 67 2008 Sentra CY
140. gaging with the incorrect pin hole when installing the camshaft sprocket INT Remove camshaft sprockets INT 1 and EXH 2 e Secure hexagonal part A of camshaft with a wrench Loosen camshaft sprocket bolts and remove camshaft sprocket CAUTION Never rotate crankshaft or camshaft while timing chain is removed It causes interference between valve and piston e Never loosen the bolts with securing anything other than the camshaft hexagonal part or with tensioning the timing chain lt Engine front Cut liquid gasket by prying the position shown and then remove the camshaft bracket lt Engine front CAUTION Be careful not to damage the mating surface A more adhesive liquid gasket is applied compared to pre vious types when shipped so it should not be forced off the position not specified O 12 Remove camshafts Revision July 2007 EM 47 MR20DE PBIC3454J PBIC3176J PBIC3358J 2008 Sentra CAMSHAFT lt SERVICEINFORMATION gt MRO EY 13 Remove valve lifters NOTE Identify installed positions and store them without mixing them up INSPECTION AFTER REMOVAL Camshaft Runout 1 Put V block on a precise flat table and support No 2 and 5 jour nal of camshaft CAUTION Never support No 1 journal on the side of camshaft sprocket because it has a different diameter from the other four locations 2 Set dial indicator A vertically to No 3 journal 3 Turn c
141. haft bearing noise Piston pin noise Tappet noise Timing chain and chain tensioner noise Drive belt noise stick slipping WBIAO069E Use the Chart Below to Help You Find the Cause of the Symptom INFOID 0000000001849624 1 Locate the area where noise occurs 2 Confirm the type of noise Revision July 2007 EM 122 2008 Sentra NOISE VIBRATION AND HARSHNESS NVH TROUBLESHOOTING lt SERVICE INFORMATION gt 3 Specify the operating condition of engine 4 Check specified noise source If necessary repair or replace these parts Operating condition of engine QR25DE Refer Location Type of Before After When f Source of of noise noise warm warm start When When While noise Checkta ence page idling racing driving up up ing Top oten Ticking or C A A B Tappet Valve clearance EM 153 gine clicking noise Rocker cover Camshaft Camshaft journal clear EM 145 Cylinder Rattle C A A B C bearing ance EM 145 head noise Camshaft runout Piston and piston pin Slap or A ne B B Piston pin clearance EM 194 knock noise Connecting rod bushing EM 194 clearance Piston to bore clear apu Piston ring side clear EM 194 shaft pul Slap or _ _ B 5 a Piston ee g EM 194 ley rap slap noise 5 EM 194 Cylinder Piston ring end gap y A d EM 194 block Connecting rod ben Si
142. he signal plate while mounted on the crankshaft When setting the crankshaft on a flat surface use a block of wood to avoid interference between the signal plate and the surface Do not remove signal plate unless it is necessary 16 Pull the rear oil seal out of the rear end of the crankshaft CAUTION Do not to damage the crankshaft or cylinder block when Signal plate SREE removing the rear oil seal NOTE When replacing the rear oil seal without removing the cylinder block use a screwdriver to pull it out from between crankshaft and block 17 Remove the main bearings and thrust bearings from the cylinder block and lower cylinder block CAUTION Identify and number the bearings if reusing them so that they are assembled in the same position and direction ASSEMBLY 1 Using compressed air clean out the coolant and oil passages in the cylinder block the cylinder bore and the crankcase to remove any foreign material CAUTION Use approved safety glasses to protect your eyes Revision July 2007 EM 183 2008 Sentra CYLINDER BLOCK lt SERVIGEINFORMATION gt TT 2 Install the drain plugs on the cylinder block e Apply Silicone RTV Sealant Use Genuine Silicone RTV Sealant or equivalent Refer to GI 42 Recommended Chemical Product and Sealant e Replace the copper washers with new ones O 50 0 56 9 Nem Lisa kg m 5 2 5 8 kg m 37 41 ft lb 69 104 in Ib Qa Apply Genuine Liquid Gasket or e
143. ice Tool E Kent Moore No Description Tool name EM BT 3373 F Checking drive belt tension jem Belt tension gauge AMA126 Power tool Loosening bolts and nuts PBICO190E Spark plug wrench Removing and installing spark plug 14mm 0 55 in PBIC2982E Valve seat cutter set Finishing valve seat dimensions NT048 Piston ring expander Removing and installing piston ring NT030 KV10109300 Removing and installing crankshaft pulley ae Pulley holder oO NT628 Revision July 2007 EM 9 2008 Sentra PREPARATION lt SERVICE INFORMATION gt MR20DE Kent Moore No Description Tool name KV10111800 Removing and installing valve guide Valve guide drift PBIC4012E Valve guide reamer 1 Reaming valve guide inner hole 2 Reaming hole for oversize valve guide PBIC4013E J 43897 18 Reconditioning the exhaust system threads J 43897 12 before installing a new oxygen sensor and Air Oxygen sensor thread cleaner Fuel ratio sensor Use with anti seize lubricant shown below a J 43897 18 18 mm dia Air Fuel ratio sensors b J 43897 12 12 mm dia Air Fuel ratio sensorsr AEM488 Anti seize lubricant Permatex 133AR Lubricating oxygen sensor thread cleaning or equivalent meeting MIL specifica tool when reconditioning exhaust system tion MIL A 907 threads E20 Torx Socket Removing and installing drive plate and fly J 45816 wheel bolts LBIA0285E Revisi
144. ide 1 2 3 Make sure that the valve stem diameter is within the specification Push the valve out by approximately 15 mm 0 59 in toward the combustion chamber side to measure the valve s run out volume in the direction of dial gauge with dial gauge Half of the run out volume accounts for the valve guide clearance Revision July 2007 EM 172 2008 Sentra CYLINDER HEAD QR25DE lt SERVICE INFORMATION gt Dial gauge Intake valve guide clear 0 020 0 053 mm 0 0008 ance 0 0021 in or less Exhaust valve guide 0 030 0 063 mm 0 0012 clearance 0 0025 in or less VALVE GUIDE REPLACEMENT When valve guide is removed replace with oversized 0 2 mm 0 008 in valve guide 1 To remove valve guide heat cylinder head to 110 to 130 C 230 to 266 F by soaking in heated oil SEMO08A 2 Drive out valve guide with a press under a 20 KN 2 2 ton force pressure or hammer and suitable tool ma a ie SAS l7 OP SEM931C 3 Ream cylinder head valve guide hole using suitable reamer Intake and exhaust valve guide 9 975 9 996 mm hole diameter Service 0 3927 0 3935 in 4 Heat cylinder head to 110 to 130 C 230 to 266 F by soaking in heated oil EM 173 2008 Sentra Revision July 2007 CYLINDER HEAD lt SERVICE INFORMATION gt QR25DE 5 Press valve guide from camshaft side to dimensions as shown Intake side Exhaust side PBICO078E 6 Apply finish to valve guide
145. in above step 1 to the Main Bearing Selection Table 3 Follow steps 3 and 4 in When New Cylinder Block and Crankshaft are Used Revision July 2007 EM 191 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt QR25DE Main Bearing Selection Table No 1 3 and No 5 journals Cylinder block main bearing hausing inner diameter Inner diameter Crankshaft Unit mm journal outer in diameter Outer diameter Unit mm in 58 947 58 948 2 3207 2 3208 58 953 58 954 2 3210 2 3210 58 954 58 955 2 3210 2 3211 58 955 58 956 2 3211 2 3211 N N 58 956 58 957 2 3211 2 3211 58 964 58 965 2 3214 2 3215 58 957 58 958 2 3211 2 3212 979 54 978 2 978 54 977 2 977 54 976 2 976 54 975 2 975 54 974 2 974 54 973 2 973 54 972 2 972 54 971 2 971 54 970 2 970 54 969 2 969 54 968 2 968 54 967 2 967 54 966 2 966 54 965 2 965 54 964 2 964 54 963 2 963 54 962 2 962 54 961 2 961 54 960 2 960 54 959 2 959 54 958 2 958 54 957 2 957 54 956 2 956 54 955 2 2 N ES dn dd EEEE glefe C040 58 967 2 9007 2 P eee eeke EEE E aan e aes A wlwlo i h N w Q A N o wo N ao nN wo 2 w ow wo amp 9 A A A 56 6 A
146. inder head Valve seat INT 8 valve INT 9 Valve EXH 10 Valve seat EXH 11 Spark plug 12 Spark plug tube CAUTION e When installing camshafts chain tensioners oil seals or other sliding parts lubricate contacting surfaces with new engine oil e Apply new engine oil to threads and seat surfaces when installing the cylinder head camshaft sprocket crankshaft pulley and camshaft bracket Attach tags to valve lifters so all parts are assembled in their original position DISASSEMBLY 1 2 Remove the valve lifter e Confirm installation point Remove the valve collet valve spring retainer and valve spring using Tool Tool number KV10116200 J 26336 B KV10115900 J 26336 20 CAUTION Do not remove valve spring seat from valve spring Push valve stem to combustion chamber side and remove valve e Inspect valve guide clearance before removal Refer to EM 172 Inspection After Disassembly e Confirm installation point Remove valve oil seal using Tool WBIA0477E Revision July 2007 EM 170 2008 Sentra CYLINDER HEAD lt SERVICE INFORMATION gt RSD Tool number KV10107902 J 38959 5 When valve seat must be replaced refer to EM 172 Inspection After Disassembly 6 When valve guide must be replaced refer to EM 172 Inspec tion After Disassembly 7 Remove spark plug using suitable tool 8 Remove spark plug tubes if necessary using suitable tool CAUTION Be careful not
147. ing the crank shaft NOTE Dowel pins for the crankshaft and signal plate are supplied as a set for each 5 Install the crankshaft onto the cylinder block WBIADasaE e While turning the crankshaft by hand check that it turns smoothly Revision July 2007 EM 184 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt QR25DE 6 Install the lower cylinder block e Apply Silicone RTV Sealant to positions as shown e Use Genuine Silicone RTV Sealant or equivalent Refer to Gl 42 Recommended Chemical Product and Sealant NOTE Cylinder block and lower cylinder block are machined together Neither of them can be replaced separately CAUTION After the Silicone RTV Sealant is applied the lower cylinder block installation must be finished within 5 minutes WBIA0899E 7 Tighten lower cylinder block bolts in the numerical order as shown and according to the following steps a Apply new engine oil to threads and seat surfaces of the bolts b Tighten bolts No 11 22 only in the order as shown to specifica tion below Step 1 bolts 11 22 only 25 1 N m 2 6 kg m 19 ft Ib Engine front KBIAO063E c Tighten bolts No 1 10 only in the order as shown to specification below Step 2 bolts 1 10 only 39 2 N m 4 0 kg m 29 ft lb d Tighten bolts No 1 10 only in the order as shown to specifica tion below CAUTION Check tightening angle Do not make judgment by visual inspect
148. ion Tool number KV 10112100 BT 8653 A Step 3 bolts 1 10 only 60 degrees rotation e Wipe off completely any protruding Silicone RTV Sealant on the exterior of engine e Check crankshaft side clearance Refer to EM 194 Inspection After Disassembly e After installing the bolts make sure that the crankshaft can be rotated smoothly by hand 8 Install the rear oil seal e Press the oil seal between cylinder block and crankshaft with a suitable drift e Be careful not to touch the grease on the oil seal lip e Be careful not to cause scratches or burrs when pressing in the rear oil seal SBIAO280E Revision July 2007 EM 185 2008 Sentra CYLINDER BLOCK lt SERVICEINFORMATION gt LORS e Press in rear oil seal to the position as shown 0 0 5 mm 0 0 020 in Cylinder block rear end face J Rear oil seal SBIAO281E 9 Install the piston to the connecting rod Assemble the components in their original positions Using a snap ring pliers install the snap ring to the grooves of the piston s rear side e Insert the piston pin snap ring fully into groove b Install the piston to the connecting rod e Using a heat gun heat the piston approximately 60 70 C 140 158 F until the piston pin can be pushed in by hand without excessive force From the front to the rear insert the piston pin into the piston and the connecting rod e Assemble so that the front mark on the piston crown and the
149. ion apply the seal ant to the groove e As for the bolt holes normally apply the sealant inside the holes If specified it should be applied outside the holes Make sure to read the text of this manual Within five minutes of the sealant application install the mat ing component WBIA0567E If the sealant protrudes wipe it off immediately Do not retighten after the installation Revision July 2007 EM 5 2008 Sentra PRECAUTIONS lt SERVIGE INFORMATION gt ERODE e After 30 minutes or more have passed from the installation fill py Taner the engine with the specified oil and coolant Refer to MA 13 side MR20DE 7 Groove Bolt hole Inner side SEM159F CAUTION Follow all specific instructions in this manual Revision July 2007 EM 6 2008 Sentra PREPARATION lt SERVIGEINFORMATION gt ooo EMIR2007 PREPARATION Special Service Tool INFo1D 0000000001849569 The actual shapes of Kent Moore tools may differ from those of special service tools illustrated here EM Tool number Description Kent Moore No Tool name KV10111100 Removing steel oil pan and rear timing J 37228 chain case Seal cutter NT046 KV10112100 Tightening bolts for bearing cap cylinder BT 8653 A head etc Angle wrench NT014 KV10107902 Removing valve oil seal J 38959 Valve oil seal puller S NTO11 EM03470000 Installing piston assembly into cylinder J 8037 bore Piston ring comp
150. ioner pulley bolt Do not turn it counterclockwise If turned counterclock wise the complete auto tensioner must be replaced as a unit including pulley INSTALLATION Installation is in the reverse order of removal CAUTION Revision July 2007 EM 125 2008 Sentra DRIVE BELTS lt SERVIGEINFORMATION gt TS QR2DE If there is damage greater than peeled paint replace drive belt auto tensioner units Install the drive belt auto tensioner carefully so not to damage the water pump pulley Do not swap the pulley between the new and old auto tensioner units Revision July 2007 EM 126 2008 Sentra AIR CLEANER AND AIR DUCT lt SERVICE INFORMATION gt QR25DE AIR CLEANER AND AIR DUCT Re moval and Installation INFOID 0000000001849629 SEC 118 148 165 WBIA0861E 1 Electronic throttle control actuator 2 Air duct 3 Front air duct tube 4 Air cleaner case 5 Mass air flow sensor 6 Resonator tube 7 Resonator in fender REMOVAL 1 Disconnect the mass air flow sensor electrical connector 2 Disconnect the tube clamp at the electronic throttle control actuator and the fresh air intake tube 3 Remove air cleaner to electronic throttle control actuator tube air cleaner case with mass air flow sensor attached 4 Remove mass air flow sensor from air cleaner case as necessary CAUTION Handle the mass air flow sensor with care Do not shock it Do not disassemble it Do not touch the inter
151. kshaft 2 Jeolele rlelelelelelolslolclalalalalelele ini Tit spy Py TPS TP TFPoOlMmosMoy yMolswoj swos swos swl sywols w w main journal 5 IRIRIRIRIRIRIRIRIR R R RIR RIRI RIRIK RR diameters gt ajalisi ilaia aiaa Unit mm in 2 DIDIOHrINUIMISTILOLOSRI DIDI Ol r nNIMIJ HoOso INr oS eS eS ee ee eee ae ee fee eo 0j ojojojojojojojojojojojojojojojojojojo 6 6 o o 6 6 5 c o 6 6 5 c c c 6 6o s olo WTO TM TO MIO TMO OTO MO MO M MO MO MO W WwW WwW wo S B S S S S S S S S S S SlSlzjSj2jF 2 e Axle diameter oj a j jejsjsjajajejejsjajajajajajaja WTO WO O O Ol O O O AO O SOSO SO O O OlO a o 1O O 0 TOTO O MOTO O TO TOUS A FLO FLO LO LO A 51 978 51 979 2 0464 2 0464 1 2 12 2 2 2 23 23 23 3 3 34 34 4 4 4 45 B 51 977 51 978 2 0463 2 0464 12 12 12 2 2 23 23 3 3 34 34 4 4 4 45 45 C 51 976 51 977 2 0463 2 0463 12 12 2 2 2 23 3 3 3 34 4 45 45 45 D 51 975 51 976 2 0463 2 0463 23 23 34 34 5 E 51 974 51 975 2 0462 2 0463 3 3 34 34 34 4 4 4 45 45 45 5 5 F 51 973 51 974 2 0462 2 0462 23 3 34 34 34 4 4 4 45 45 45 5 5 5 G 51 972 51 973 2 0461 2 0462 2 23 23 34 34 34 4 4 4 45 45 45 5 5 5 56 H 51 971 51 972 2 0461 2 0461 23 23 56 J 51 970 51 971 2 0461 2 0461 3 34 34 34 4 45 45 45 5 5 5 56 56 56 K 51 969 51 970 2 0460 2 0461 3 3 34 34 34 4 4 4 45 45 45 5 5 5 56 56 56
152. l Cable and Air Bag Module see the SRS section Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this Service Manual SRS wiring harnesses can be identified by yellow and or orange harnesses or har ness connectors Precaution for Draining Coolant INFOID 0000000001849614 e Drain coolant when engine is cooled Precaution for Disconnecting Fuel Piping INFOID 0000000001849615 e Before starting work make sure no fire or spark producing items are in the work area e Release fuel pressure before any removal or disassembly e After disconnecting pipes plug openings to stop fuel leakage Precaution for Removal and Disassembly InFo10 0000000001849616 e When instructed to use special service tools use the specified tools Always be careful to work safely avoid forceful operations e Use maximum care to avoid damage to mating or sliding surfaces e Cover openings of engine system with tape or equivalent if necessary to seal out foreign materials e Mark and arrange disassembly parts in an organized way for easy troubleshooting and assembly e When loosening nuts and bolts as a basic rule start with the one furthest outside then the one diagonally opposite and so on If the order of loosening is specified follow the specifications Precaution for Inspection Repair and Replacement INFOID 0000000001849617 e Before repairing or replacing thoroughly inspect parts Inspect new replacement pa
153. l gt lalalal gt ele s olele s a ln oa e elelelo s a sl lololalalsla s elele gt lel ala Ql 6 67 7 7 67 67 ele 2 lel lela l lllolala 8 2 812 gt gt o oo e A B c D E F G H J K ig M N P R S i U v W X Y 4 7 wo PUR ajaja ala KBIAO150E Main Bearing Grade Table All Journals Unit mm in Grade number Thickness laentification color Remarks UPR LWR 0 1 973 1 976 0 0777 0 0778 Black 1 1 976 1 979 0 0778 0 0779 Brown 2 1 979 1 982 0 0779 0 0780 Green 3 1 982 1 985 0 0780 0 0781 Yellow Gradaand color are ihe sane 4 1 985 1 988 0 0781 0 0783 Blue for upper and lower bearings 5 1 988 1 991 0 0783 0 0784 Pink 6 1 991 1 994 0 0784 0 0785 Purple 7 1 994 1 997 0 0785 0 0786 White Revision July 2007 EM 193 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt QR25DE UPR 1 973 1 976 0 0777 0 0778 01 Black Brown LWR 1 976 1 979 0 0778 0 0779 UPR 1 976 1 979 0 0778 0 0779 12 Brown Green LWR 1 979 1 982 0 0779 0 0780 UPR 1 979 1 982 0 0779 0 0780 23 Green Yellow LWR 1 982 1 985 0 0780 0 0781 Pa 1 982 1 985 0 0780 0 0781 Grade and color are different 34 i Yellow Blue for upper and lower bearings LWR 1 985 1 988 0 0781 0 0783 UPR 1 985 1 9
154. la R Nem kg m in Ib O Nem kg m ft lb PBIC3536J 1 PCV hose 2 Rocker cover 3 Spark plug 4 Ignition coil 5 PCV hose 6 PCV valve 7 O ring 8 Gasket A To air duct B Refer to EM 30 C To intake manifold Removal and Installation INFOID 0000000001849589 REMOVAL 1 Remove intake manifold Refer to EM 18 2 Remove ignition coil CAUTION e Handle it carefully and avoid impacts Never disassemble Revision July 2007 EM 30 2008 Sentra IGNITION COIL SPARK PLUG AND ROCKER COVER lt SERVICE INFORMATION gt MR20DE 3 Remove spark plug using suitable tool CAUTION i Wrench with a magnet Never drop or shock it Q to hold spark plug 14 mm 0 55 in PBIC3871E 4 Remove rocker cover Loosen bolts in reverse order as shown lt Engine front PBIC3151J INSPECTION AFTER REMOVAL CAUTION Never drop or shock spark plug e Checking and adjusting spark plug gap is not required between change intervals SMA806CA If spark plug tip is covered with carbon a spark plug cleaner may be used Cleaner air pressure Less than 588 kPa 5 88 bar 6 kg cm2 85 psi Cleaning time Less than 20 seconds Never use wire brush for cleaning spark plug came The oe SMA773C INSTALLATION 1 Install rocker cover gasket to rocker cover Revision July 2007 EM 31 2008 Sentra IGNITION COIL SPARK PLUG AND ROCKER COVER lt SERVICE INFORMATION MRO 2 Install rocker cover
155. le 4 Apply the symbol obtained to the Connecting Rod Bearing Grade Table to select connecting rod bearing When Crankshaft and Connecting Rod are Reused 1 Measure the dimensions of the connecting rod big end diameter and crankshaft pin journal diameter indi vidually Refer to EM 88 Inspection After Disassembly and EM 88 Inspection After Disassembly Revision July 2007 EM 82 2008 Sentra CYLINDER BLOCK lt SERVICEINFORMATION gt EMRE 2 Apply the measured dimension to the Connecting Rod Bearing Selection Table 3 Read the symbol at the cross point of selected row and column in the Connecting Rod Bearing Selection Table 4 Apply the symbol obtained to the Connecting Rod Bearing Grade Table to select connecting rod bearing EM Connecting Rod Bearing Selection Table Connecting rod big end diameter Unit mm in Crankshaft pin journal diameter Unit mm in Hole diameter 47 002 1 8504 1 8505 47 012 1 8508 1 8509 47 012 47 013 1 8509 1 8509 Axle diameter 47 000 47 001 1 8504 1 8504 o o f 47 001 47 005 47 006 1 8506 1 8506 47 006 47 007 1 8506 1 8507 47 007 47 008 1 8507 1 8507 47 008 47 009 1 8507 1 8507 47 009 47 010 1 8507 1 8508 47 011 47 004 47 005 1 8505 1 8506 47 010 47 011 1 8508 1 8508 43 970 43 971 1 7311 1 7311 0 43 969 43 970 1 7311 1 7311
156. lightly to entire outside area of new rear oil seal Use Genuine Silicone RTV Sealant or equivalent Refer to Gl 42 Recommended Chemical Prod uct and Sealant Revision July 2007 EM 59 2008 Sentra OIL SEAL lt SERVICE INFORMATION gt MR20DE 2 Install rear oil seal so that each seal lip is oriented as shown Dust seal lip Oil seal lip Engine outside tre Engine inside PBIC3485J e Install rear oil seal with a suitable tool with an outer diameter 115 mm 4 53 in and inner diameter 90 mm 3 54 in A CAUTION Be careful not to damage crankshaft and cylinder block e Press fit oil seal straight to avoid causing burrs or tilt ing Do not touch grease applied onto oil seal lip PBIC3951E e Install rear oil seal 1 to the position as shown A Rear end surface of cylinder block ES in NOTE The standard surface of the dimension is the rear end surface of cylinder block V PBIC3761E 3 Installation of the remaining components is in the reverse order of removal Revision July 2007 EM 60 2008 Sentra CYLINDER HEAD lt SERVICEINFORMATION gt MRO CYLINDER HEAD O n Ve h i C e Se rv i ce INFOID 0000000001849600 N O ore CHECKING COMPRESSION PRESSURE 1 2 3 Warm up engine thoroughly Then stop it Release fuel pressure Refer to EC 83 Fuel Pressure Check Disconnect fuel pump fuse 1 to avoid fuel injection during mea surement lt 3 Vehicle fro
157. lock NOTE Oversize piston is not provided PBIC4014E Piston Skirt Diameter Measure the outer diameter of piston skirt with a micrometer A Measure point Distance from the top 39 9 mm 1 571 in Standard 83 970 83 990 mm 3 3059 3 3067 in PBIC3272J Piston to Cylinder Bore Clearance Calculate by piston skirt diameter and cylinder bore inner diameter direction X position B Clearance Cylinder bore inner diameter Piston skirt diameter Standard 0 020 0 040 mm 0 0008 0 0016 in Limit 0 08 mm 0 0031 in e If it exceeds the limit replace piston and piston pin assembly and or cylinder block Refer to EM 80 How to Select Piston and Bearing CRANKSHAFT MAIN JOURNAL DIAMETER Revision July 2007 EM 93 2008 Sentra CYLINDER BLOCK lt SERVIGEINFORMATION gt SS _EMR200 e Measure the outer diameter of crankshaft main journals with a micrometer A Standard 51 959 51 979 mm 2 0456 2 0464 in dia e If out of the standard measure the main bearing oil clearance Then use undersize bearing Follow the MAIN BEARING OIL CLEARANCE procedure PBIC3457J CRANKSHAFT PIN JOURNAL DIAMETER e Measure the outer diameter of crankshaft pin journal with a micrometer Standard 43 953 43 971 mm 1 7304 1 7311 in dia e If out of the standard measure the connecting rod bearing oil clearance Then use undersize bearing Follow the CONNECTING ROD BEARING OIL CLEARANCE p
158. low the Balancer Unit Bolt Outer Diame ter procedure 4 Co e g K OF T Tool number KV10112100 BT 8653 A Eg CAUTION e Check tightening angle with an angle wrench or a protrac tor Do not make judgment by visual check alone WBIA0887E e Apply new engine oil to threads and seating surfaces of bolts Balancer unit bolts Step 1 42 N m 4 3 kg m 31 ft lb Step 2 90 95 degrees rotation Target 90 degrees Step 3 Loosen in reverse 0 N m 0 kg m 0 ft lb order or tightening Step 4 45 2 51 0 N m 4 6 5 2 kg m 34 37 ft lb Step 5 90 95 degrees rotation weiaoessE Target 90 degrees Revision July 2007 EM 160 2008 Sentra TIMING CHAIN lt SERVICE INFORMATION gt 3 6 Revision July 2007 Install the crankshaft sprocket and timing chain for the balancer unit e Make sure that the crankshaft sprocket is positioned with mat ing marks on the block and sprocket meeting at the top e Install it by lining up mating marks on each sprocket and timing chain Install timing chain tensioner for balancer unit 1 1 Fix the plunger at the most compressed position using a stopper pin A and then install it 2 Securely pull out lt the stopper pin after installing the tim ing chain tensioner for balancer unit 3 Check matching mark position of balancer unit timing chain and each sprocket again Install timing chain and
159. lue link Matching mark stamping GUO WY WON Matching mark outer groove Matching mark orange link E Matching mark stamping NOTE There are 2 outer grooves in camshaft sprocket INT The wider one is a matching mark e If these matching marks are not aligned rotate the camshaft slightly by holding the hexagonal portion to correct the posi tion CAUTION Check matching mark position of each sprocket and timing chain again after installing the timing chain 6 Install the timing chain tension guide 3 and the timing chain slack guide 2 1 Timing chain 7 Install timing chain tensioner 1 e Fix the plunger at the most compressed position using a stop per pin A and then install it e Securely pull out the stopper pin after installing the timing chain tensioner PBIC3165J Revision July 2007 EM 43 2008 Sentra TIMING CHAIN lt SERVICE INFORMATION gt MR20DE 8 Check matching mark position of timing chain and each sprocket again 9 Apply new engine oil to new front oil seal joint surface 10 Using a suitable tool install front oil seal so that each seal lip is oriented as shown A Dust seal lip B Oil seal lip lt 2 Engine front 4a Engine rear e Press fit front oil seal until it is flush with front end surface of front cover as shown below with a suitable tool Within 0 3 mm 0 012 in toward engine front Within 0 5 mm 0 020 in toward engine rear a
160. ly Determine the grade by comparing the measurement with the values of each selection table e For details of the measurement method of each part the reuse standards and the selection method of the selective fitting parts use the applicable procedures HOW TO SELECT PISTON When New Cylinder Block is Used e Check the cylinder bore grade on rear left side of cylinder block L and select piston of the same grade Correction stamp Standard stamp Ao Tratranmovooawa gt a Engine front e If there is a correction stamp mark on the cylinder block use it as a correct reference Cylinder No 1 bore grade Cylinder No 2 bore grade Cylinder No 3 bore grade Cylinder No 4 bore grade No 1 main bearing housing grade No 2 main bearing housing grade No 3 main bearing housing grade No 4 main bearing housing grade No 5 main bearing housing grade When Cylinder Block is Reused 1 Measure the cylinder bore inner diameter Refer to 2 Determine the bore grade by comparing the measurement with the values under the cylinder bore inner diameter of the Piston Selection Table Revision July 2007 Piston grade piston outer diam eter Piston grade cylinder bore grade inner diameter of bore elooeal In e 00600 oH PBIC3264J EM 88 Inspection After Disassembly EM 81 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt MRO 3 Select piston of the same grade
161. m in Item Thickness Main journal diameter US 0 25 0 0098 2 126 2 134 0 0837 0 0840 Grind so that bearing clearance is the specified value Bearing Oil Clearance Unit mm in No 1 4 and 5 0 024 0 034 0 0009 0 0013 Standard Main bearing oil clearance No 2 and 3 0 012 0 022 0 0005 0 0009 Limit 0 065 0 0026 CONNECTING ROD BEARING Grade number Thickness mmn in Identification color Remarks 0 1 494 1 497 0 0588 0 0589 Black 1 1 497 1 500 0 0589 0 0591 Brown 2 1 500 1 503 0 0591 0 0592 Green Gradeand colorare the same for upper and lower bearings 3 1 503 1 506 0 0592 0 0593 Yellow 4 1 506 1 509 0 0593 0 0594 Blue i UPR 1 494 1 497 0 0588 0 0589 Black LWR 1 497 1 500 0 0589 0 0591 Brown 1 UPR 1 497 1 500 0 0589 0 0591 Brown LWR 1 500 1 503 0 0591 0 0592 Green Grade and color are different between upper and lower bear 3 UPR 1 500 1 503 0 0591 0 0592 Green ings LWR 1 503 1 506 0 0592 0 0593 Yellow S UPR 1 503 1 506 0 0592 0 0593 Yellow LWR 1 506 1 509 0 0593 0 0594 Blue Undersize Unit mm in Item Thickness Crank pin journal diameter US 0 25 0 0098 1 623 1 631 0 0639 0 0642 Grind so that bearing clearance is the specified value Bearing Oil Clearance Unit mm in Revision July 2007 EM 112 2008 Sentra SERVICE DATA AND SPECIFICATIONS SDS lt SER
162. m procedure in INSPECTION AFTER INSTALLATION CONNECTING QUICK CONNECTOR ON THE FUEL HOSE ENGINE SIDE 1 Make sure no foreign substances are deposited in and around the fuel tube and quick connector and there is no damage to them 2 Thinly apply new engine oil around the fuel tube tip end Revision July 2007 EM 130 2008 Sentra INTAKE MANIFOLD lt SERVIGEINFORMATION gt RSD 3 Align center to insert quick connector straight into fuel tube e Insert fuel tube into quick connector until the top spool on fuel tubes is inserted completely and the second level spool is Quick positioned slightly below the quick connector bottom end CAUTION connector Hold at position A as shown when inserting the fuel fo tube into the quick connector e Carefully align to center to avoid inclined insertion to pre Top vane 2nd vent damage to the O ring inside the quick connector spool insertion levalispool Insert the fuel tube until you hear a click sound and actually feel the engagement e To avoid misidentification of engagement with a similar sound be sure to perform the next step 4 Before clamping the fuel hose with the hose clamp pull the quick connector hard by hand holding at the A position as shown Make sure it is completely engaged connected so that it does not come off of the fuel tube NOTE Recommended pulling force is 50 N 5 1 kg f 11 2 Ib f 5 Install quick connector cap on quick connec
163. mark st A oy Balancer unit stamp chain tensioner Mating mark stamp Yellow link Orange link Balancer unit sprocket PBIC3029E Suitable tool 56 mm 2 20 in dia SBIAO266E 2008 Sentra ogv TIMING CHAIN lt SERVICE INFORMATION gt QR25DE 7 install frontcover with ineiolownaDKcadle CO CSCS C S S OA a b Install front cover with the following procedure Install O rings to cylinder head and cylinder block Apply Genuine Silicone RTV Sealant or equivalent to positions specified Refer to Gl 42 Recommended Chemical Product and Sealant C Sealant dimension 3 9 mm 0 154 in dia Make sure the mating marks on the timing chain and each sprocket are still aligned Then install the front cover CAUTION Be careful not to damage the front oil seal during installa tion with the front end of the crankshaft WBIA0890E Tighten front cover bolts in the numerical order as shown After all bolts are tightened retighten them to the specified torque Front cover bolt torque Bolts A 49 N m 5 0 kg m 36 ft lb Bolts B 12 7 N m 1 3 kg m 9 ft lb Bolts C 12 7 N m 1 3 kg m 9 ft lb Bolts D 49 N m 5 0 kg m 36 ft lb E Dowel pins CAUTION Wipe off any excess sealant leaking at the surface for installing the oil pan WBIA0891E Install the chain guide between the camshaft sprockets Install IVT cover with the following procedure Install I
164. mm in A PBIC0188E Grade No 1 88 980 88 990 3 5031 3 5035 Grade No 2 88 990 89 000 3 5035 3 5039 Piston skirt diameter A Standard Grade No 3 89 000 89 010 3 5039 3 5043 0 20 0 0079 oversize service 89 180 89 210 3 5110 3 5122 H dimension 42 1 65 Grade No 0 19 993 19 999 0 7871 0 7874 Piston pin bore diameter Grade No 1 19 999 20 005 0 7874 0 7876 Standard 0 010 0 030 0 0004 0 0012 Piston clearance to cylinder bore Limit 0 08 0 0031 Piston Ring Unit mm in Standard Limit Top 0 040 0 080 0 0018 0 0031 0 11 0 0043 Side clearance 2nd 0 030 0 070 0 0012 0 0028 0 10 0 0039 Oil ring 0 045 0 125 0 0018 0 0049 Top 0 21 0 31 0 0083 0 0122 0 54 0 0213 End gap 2nd 0 37 0 52 0 0146 0 0205 0 67 0 0264 Oil rail ring 0 20 0 45 0 0079 0 0177 0 95 0 0374 Piston Pin Unit mm in f Grade No 0 19 989 19 995 0 7870 0 7872 Piston pin outer diameter Grade No 1 19 995 20 001 0 7872 0 7874 Piston to piston pin clearance Standard 0 002 0 006 0 0001 0 0002 R pin to connecting rod bushing clear Standard 0 005 0 017 0 0002 0 0007 CONNECTING ROD Unit mm in Center distance 143 00 143 10 5 63 5 63 Bend per 100 3 94 Limit 0 15 0 0059 Torsion per 100 3 94 Limit 0 30 0 0118 Connecting rod small end inner diameter 22 000 22 012 0 7874 0 7879 Connecting rod small end inner Grade No 0 20 0
165. mp pulley in sequence and remove it INSTALLATION 1 Hook the auxiliary drive belt onto all of the pulleys except for the water pump pulley Hook the drive belt onto water pump pulley last CAUTION Confirm belts are completely set on the pulleys 2 Release tensioner and apply tensions to belt CAUTION Avoid placing hand in a location where pinching may occur if the holding tool accidentally comes off Do not loosen the auto tensioner pulley bolt Don t turn it counterclockwise If turned counter clockwise the complete auto tensioner must be replaced as a unit including pulley 3 Turn crankshaft pulley clockwise several times to equalize tension between each pulley 4 Confirm tensions of belt at indicator is within the allowable use range Refer to EM 124 Checking Drive Belts Removal and Installation of Drive Belt Auto tensioner ee SEC 117 0 25 2 6 18 WBIAO860E 1 Drive Belt auto tensioner 2 Water pump pulley REMOVAL CAUTION The complete auto tensioner must be replaced as a unit including the pulley 1 Remove the front RH engine cover 2 Remove the drive belt EM 124 Removal and Installation e Insert a rod approximately 6 mm 0 24 in in diameter through the rear of tensioner into the retaining boss to lock tensioner pulley 3 Remove the generator Refer to SC 30 Removal and Installation QR25DE 4 Remove the drive belt auto tensioner with power tool CAUTION Do not loosen the auto tens
166. n Oil ring 0 78 mm 0 031 in rail ring If the measured value exceeds the limit replace piston ring and measure again If it still exceeds the limit re bore cylinder and use oversized piston and piston rings CONNECTING ROD BEND AND TORSION Revision July 2007 EM 90 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt MRO e Check with a connecting rod aligner C Feeler gauge Bend A hay Limit 0 15 mm 0 0059 in per 100 mm 3 94 in length l Torsion B a Ne nee RFS Limit 0 30 mm 0 0118 in per 100 mm 3 94 in length HD e If it exceeds the limit replace connecting rod assembly PBIC3268J CONNECTING ROD BIG END DIAMETER e Install connecting rod cap 1 without connecting rod bearing installed and tightening connecting rod bolts to the specified torque Refer to EM 72 Disassembly and Assembly for the tight ening procedure 2 Connecting rod A Example B Measuring direction of inner diameter e Measure the inner diameter of connecting rod big end with an inside micrometer PBIC3269J Standard 47 000 47 013 mm 1 8504 1 8509 in e If out of the standard replace connecting rod assembly CONNECTING ROD BUSHING OIL CLEARANCE Connecting Rod Bushing Inner Diameter Measure the inner diameter of connecting rod bushing with an inside micrometer A Standard 20 000 20 012 mm 0 7874 0 7879 in PBIC3270J Piston Pin Outer Diameter Revision July 2007 EM 91 2008 Sentr
167. n avoiding oil holes e Tighten the main bearing bolts to the specified torque CAUTION Never rotate the crankshaft e Remove the bearing cap and bearings and using the scale on the plastigage bag measure the plastigage width NOTE The procedure when the measured value exceeds the limit is same as that described in the Method by Calculation CRUSH HEIGHT OF MAIN BEARING e When the bearing cap is removed after being tightened to the specified torque with main bearings installed the tip end of bearing must protrude Crush height Standard There must be crush height e If the standard is not met replace main bearings SEM502G OUTER DIAMETER OF LOWER CYLINDER BLOCK BOLT Revision July 2007 EM 201 2008 Sentra CYLINDER BLOCK lt SERVIGEINFORMATION gt ooo o e Perform only with M10 0 39 in bolts e Measure outer diameters d1 d2 at two positions as shown e Measure d2 at a point within area A as shown e When the value of d1 d2 exceeds the limit a large difference in dimensions replace the bolt with a new one 20mm 30mm 0 79in 1 18in Limit 0 13 mm 0 0051 in 0 39in PBICO272E OUTER DIAMETER OF CONNECTING ROD BOLT e Measure outer diameter d at position as shown e When d exceeds the limit when it becomes thinner replace the bolt with a new one Limit 7 75 mm 0 3051 in or less 19mm 0 75in PBICO273E MOVEMENT AMOUNT OF FLYWHEEL M T MODEL NOTE
168. n grade are provided only for the parts installed at the plant For service parts no grades can be selected Only 0 grade is avail Big end able Small end diameter grade e Follow the CONNECTING ROD BUSHING OIL CLEARANCE diameter grade SMALL END for the values for each grade at the plant Oil splash gt e Regarding marks on piston head Refer to EM 188 How to Select i Piston and Bearing J PA A Reference X code Reference code Bearing stopper groove SBIA0282E PISTON RING SIDE CLEARANCE e Measure side clearance of piston ring and piston ring groove using a feeler gauge Refer to EM 204 Standard and Limit e If out of specification replace piston and or piston ring assembly PISTON RING END GAP e Check if inner diameter of cylinder bore is within specification Follow the PISTON TO CYLINDER BORE CLEARANCE proce Piston dure Press fit e Insert piston ring until middle of cylinder with piston and measure gap using a feeler gauge Refer to EM 204 Standard and Limit e If out of specification replace piston ring If gap still exceeds the limit even with a new ring re bore cylinder and use oversized pis ton and piston ring CONNECTING ROD BEND AND TORSION e Check with connecting rod aligner Refer to EM 204 Standard and Limit Torsion SEM003F Revision July 2007 EM 196 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt e If it exceeds the limit r
169. n bolts in numerical order as shown lt Engine front PBIC3527J Revision July 2007 EM 19 2008 Sentra INTAKE MANIFOLD lt SERVICEINFORMATION gt _IMR20E 3 Tighten intake manifold bolt A Then tighten intake manifold 4 5 6 bolt B 1 Intake manifold lt Engine front PBIC3939E Install electronic throttle control actuator Install water hoses 3 5 to electronic throttle control actuator as shown 1 Electric throttle control actuator 2 Clamp _ 4 Water outlet y C gt W 3 7 mm A Paint Mark Fy SAW 0 12 0 28 in B The clamp shall not interfere with the bulged section PBIC4703E Installation of the remaining components is in the reverse order of removal INSPECTION AFTER INSTALLATION e Check for leaks of engine coolant Refer to CO 11 Inspection e Start and warm up the engine Visually check for engine coolant leaks Revision July 2007 EM 20 2008 Sentra EXHAUST MANIFOLD lt SERVIGEINFORMATION gt ERODE EXHAUST MANIFOLD Co m po n e nt INFOID 0000000001849584 SEC 140 226 v 0 50 5 5 2 37 PF 50 0 5 1 37 WBIA0778E 1 Exhaust manifold cover 2 Exhaust manifold 3 Gasket 4 Stud bolt 5 Bracket 6 A F ratio sensor 1 7 Exhaust manifold stay lt Engine front Re moval and Installation INFOID 0000000001849585 REMOVAL 1 Remove exhaust front tube Refer to EX 3 Removal and Installation 2 Remove exhaust manifold cover 3 R
170. nal sensor 5 Remove ECM bracket and CVT controler if neccessary 6 Remove the resonator in the fender as necessary INSTALLATION Installation is in the reverse order of removal CHANGING THE AIR CLEANER ELEMENT 1 Depress the air cleaner case lid side clips and remove 2 Remove the air cleaner element 3 Install a new air cleaner element 4 Installation is in the reverse order of removal Revision July 2007 EM 127 2008 Sentra INTAKE MANIFOLD lt SERVICEINFORMATION gt RSE INTAKE MANIFOLD Re m oval a nd n stal lat i O n INFOID 0000000001849630 SEC 118 140 163 O 19 6 2 0 14 I 8 4 0 86 74 ALBIA0521GB EVAP hose 2 _EVAP canister purge volume control solenoid 3 Intake manifold Intake manifold support front 5 Rubber seal 6 Intake manifold adapter Gasket 8 Gasket 9 Intake manifold support rear 10 Rubber seal 11 Electronic throttle control actuator 12 PCV hose 13 EVAP tube REMOVAL WARNING To avoid the danger of being scalded never drain the coolant when the engine is hot 1 NOOR WN Remove the engine cover Release the fuel pressure Refer to EC 592 Fuel Pressure Check Drain coolant when engine is cooled Refer to CO 36 Changing Engine Coolant Disconnect the MAF sensor electrical connector Remove air cleaner case and air duct assembly Refer to EM 127 Removal and Installation Remove cowl top Refer to El 18 Removal and Installation Discon
171. nd Replace TIMING CHAIN cecicnceececteceeet sec vicis cecvectcesesteneeese 156 MENU wesc ca ec a ae i eves td e e aaa aaa deeds 114 Removal and Installation cccceeeeeseeceeeeeeeeeees 156 Precaution for Assembly and Installation 114 Parts Requiring Angular Tightening Oech mca noe at g 115 OIL SEAL PPE EEL ELC ELLE ELLE LLL LLL 164 Precaution for Liquid Gasket ccccceeseeeeneeees 115 Removal and Installation of Valve Oil Seal 164 Removal and Installation of Front Oil Seal 164 PREPARATION ccccssscesecssssesensesseseeeeeeesen 117 Removal and Installation of Rear Oil Seal 165 Special Service Tool ccccceeceeeeeeeeeeeeeeeeeeeeeees 117 Commercial Service Tool c cccccseecsssseeeeeeenees 419 CYLINDER HEAD j cccccceisiscttensessesesisseenens 167 On Vehicle Service eccceececeessteeeeeeesteeeeeesnaaes 167 NOISE VIBRATION AND HARSHNESS Removal and Installation cccceceeeeeteeeeee 168 NVH TROUBLESHOOTING ssseeeeeeeees 122 Disassembly and Assembly ccceeeeeees 170 NVH Troubleshooting Engine Noise 4 122 Inspection After Disassembly a e 172 Use the Chart Below to Help You Find the Cause Of the Symptom 0 eee eeteeeeeeeeeeeeeeeeeeeteaeeeeeeeeee 122 ENGINE ASSEMBLY cssssssseseeessneaees 177 Removal and Installation ccceeeeeeeeseeeee 177 DRIVE BELTS viinika iada
172. nd strap 18 Remove clutch operating cylinder from transaxle and move it aside M T models 19 Disconnect the transaxle shift controls 20 Remove front exhaust tube Refer to EX 6 Removal and Installation 21 Remove the left and right drive shafts Refer to FAX 8 Removal and Installation Left Side and FAX 10 Removal and Installation Right Side 22 Remove the front suspension member Refer to FSU 10 Removal and Installation 23 Install engine slingers into front left cylinder head and rear right cylinder head e Use generator bracket bolt holes for the front slinger e Use the proper slingers and bolts as described in the Parts Catalog CO UO OO NO k st N gt Slinger bolts front B 48N m 4 9 kg m 35 ft lb Slinger bolts rear A 28 N m 2 8kg m 21 ft lb WBIA0895E 24 Support engine and transaxle assembly with engine lifting equipment from the top with the vehicle raised on a hoist 25 Remove RH engine mounting insulator and bracket 26 Remove LH transaxle mounting insulator through bolts 27 Lower the engine and transaxle assembly from the engine compartment using Tool CAUTION Before and during this procedure always check if any harnesses are left connected Avoid any damage to or any oil grease smearing or spills onto the engine mounting insulators Tool number J 47242 28 Remove the starter motor Refer to SC 21 Removal and
173. nd whether the front occupants are belted or unbelted Information necessary to service the system safely is included in the SRS and SB section of this Service Man ual WARNING To avoid rendering the SRS inoperative which could increase the risk of personal injury or death in the event of a collision which would result in air bag inflation all maintenance must be performed by an authorized NISSAN INFINITI dealer Improper maintenance including incorrect removal and installation of the SRS can lead to personal injury caused by unintentional activation of the system For removal of Spiral Cable and Air Bag Module see the SRS section Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this Service Manual SRS wiring harnesses can be identified by yellow and or orange harnesses or har ness connectors Precaution for Procedure without Cowl Top Cover INFOID 0000000001849560 When performing the procedure after removing cowl top cover cover the lower end of windshield PIIB3706J Precaution Necessary for Steering Wheel Rotation After Battery Disconnect INFOID 0000000001849561 NOTE e This Procedure is applied only to models with Intelligent Key system and NATS NISSAN ANTI THEFT SYS TEM e Remove and install all control units after disconnecting both battery cables with the ignition knob in the LOCK position e Always use CONSULT III to perform self diagnosis as a part of ea
174. ndicated by the difference in dimension between A and B at X and Y Limit Out of round X Y 0 005 mm 0 0002 in Taper A B 0 005 mm 0 0002 in CRANKSHAFT RUNOUT e Place a V block on a precise flat table to support the journals on both ends of the crankshaft e Place a dial gauge straight up on the No 3 journal e While rotating the crankshaft read the movement of the pointer on the dial gauge the total indicator reading Limit Less than 0 05 mm 0 002 in OIL CLEARANCE OF CONNECTING ROD BEARING Method of Measurement Install the connecting rod bearings to the connecting rod and the cap and tighten the connecting rod bolts to the specified torque Using a inside micrometer measure the inner diameter of connect ing rod bearing Oil clearance Inner diameter of connecting rod bearing Outer diameter of crankshaft pin Standard 0 035 0 045 mm 0 0014 0 0018 in Limit 0 10 mm 0 0039 in Revision July 2007 EM 200 QR25DE PBICO270E Out of round X Y PBICO128E PBICO271E Inside micrometer PBICO119E 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt QR25DE e If clearance cannot be adjusted within the standard grind crankshaft pin and use undersized bearing Refer to EM 188 How to Select Piston and Bearing Method of Using Plastigage Remove oil and dust on the crankshaft pin and the surfaces of each bearing completely Cut the Plastigage slightl
175. nect the following components at the intake side PCV hose EVAP canister purge volume control solenoid Electric throttle control actuator Brake booster vacuum hose Revision July 2007 EM 128 2008 Sentra INTAKE MANIFOLD lt SERVICE INFORMATION gt 8 Disconnect the fuel quick connector on the engine side AN e Using Tool perform the following steps to disconnect the quick Kuel hose connector he a y ZNN J 45488 ce Va g MK A Tool number uick Connector Engine side a Remove quick connector cap Quick connector Quick connector cap b With the sleeve side of Tool facing quick connector install Tool onto fuel tube c Insert Tool into quick connector until sleeve contacts and goes no further Hold the Tool on that position CAUTION Inserting the Tool hard will not disconnect quick connector Hold Tool where it contacts and goes no further d Pull the quick connector straight out from the fuel tube CAUTION Pull quick connector holding it at the A position as shown Do not pull with lateral force applied O ring inside quick connector may be damaged Prepare container and cloth beforehand as fuel will leak out Avoid fire and sparks QR25DE Hose Clamp Quick Connector Vehicle side ARS WBIA0148E Fuel tube LBIAOO90E t Pull quick connector Sleeve Quick connector t Insert and retain Tool Fuel tube WBIA0473E
176. nections out of the direct line of sight CAUTION Do not touch engine immediately after stopping as engine is extremely hot e Perform procedures for Throttle Valve Closed Position Learning after finishing repairs Refer to EC 590 Throttle Valve Closed Position Learning e If electric throttle control actuator is replaced perform procedures for Idle Air Volume Learning after finishing repairs Refer to EC 590 Idle Air Volume Learning Revision July 2007 EM 142 2008 Sentra ROCKER COVER lt SERVIGEINFORMATION gt oo Z OA ROCKER COVER Removal and Installation INFOID 0000000001849636 SEC 111 118 WBIA0876E 1 PCV valve 2 Oil filler cap 3 Rocker cover REMOVAL 1 Remove the ignition coils Refer to EM 137 Removal and Installation 2 Install a suitable jack under engine 3 Remove RH engine mount Refer to EM 177 4 Loosen the bolts in the numerical order as shown using power tool 5 Remove the rocker cover Remove the oil filler cap and PCV valve if necessary to transfer to the new rocker cover WBIA0877E INSTALLATION 1 Apply RTV Silicone Sealant to the joint part of the cylinder head and camshaft bracket using the following the steps Revision July 2007 EM 143 2008 Sentra ROCKER COVER lt SERVIGEINFORMATION gt TT e Use Genuine Silicone RTV Sealant or equivalent Refer to Liquid gasket GI 42 Recommended Chemical Product and Sealant ap
177. new A F ratio sensor clean the exhaust tube threads using suitable tool and approved anti seize lubricant e Do not over tighten the A F ratio sensor Doing so may damage the A F ratio sensor resulting in the MIL coming on WBIA0772E Tool number J 43897 12 Tool number J 43897 18 5 Installation of the remaining parts is in the reverse order of removal Revision July 2007 EM 23 2008 Sentra OIL PAN lt SERVIGEINFORMATION gt EMRE OIL PAN Co m po n e nt INFOID 0000000001849586 SEC 110 130 150 XY XQ OF 34 0 3 5 25 N 0 25 5 SNS 2 6 19 CG Orna Nem kg m in lb 10 1 1 0 7 E Nem kg m ft lb PBIC3123J 1 Oil level gauge 2 Oil level gauge guide 3 Rear oil seal 4 O ring 5 Oil pan upper 6 Oil pump drive chain 7 Crankshaft sprocket 8 Oil pump sprocket 9 Timing chain tensioner for oil pump 10 Drain plug 11 Drain plug washer 12 Oil pan lower 13 Connector bolt 14 Oil filter 15 O ring A Refer to LU 8 B Oil pan side CAUTION Never disassemble balancer and oil pump and oil pan upper because they are integral unit Removal and Installation INFOID 0000000001849587 REMOVAL WARNING Be careful not to burn yourself as the engine oil is hot Prolonged and repeated contact with used engine oil may cause skin cancer try to avoid direct skin contact with used oil If skin contact is made wash thoroughly with soap or hand cleaner as soon as possible 1 Dr
178. ngine to check for unusual noise and vibration e Warm up engine thoroughly to make sure there is no leakage of fuel exhaust gases or any oil fluids includ ing engine oil and engine coolant e Bleed air from lines and hoses of applicable lines such as in cooling system e After cooling down engine again check oil fluid levels including engine oil and engine coolant Refill to the specified level if necessary Summary of the inspection items Item Before starting engine Engine running After engine stopped Engine coolant Level Leakage Level Engine oil Level Leakage Level Other oils and fluid Level Leakage Level Fuel Leakage Leakage Leakage Exhaust gases Leakage Transmission transaxle CVT fluid power steering fluid brake fluid etc Revision July 2007 EM 102 2008 Sentra SERVICE DATA AND SPECIFICATIONS SDS lt SERVICE INFORMATION gt SERVICE DATA AND SPECIFICATIONS SDS Standard and Limit GENERAL SPECIFICATIONS Engine type MR20DE INFOID 000000000 1849612 MR20DE Cylinder arrangement In line 4 Displacement cm cu in 1 997 121 86 Bore and stroke mm in 84 0 x 90 1 3 307 x 3 547 Valve arrangement DOHC Firing order 1 3 4 2 Number of piston rings ea Oil 1 Compression ratio 10 2 l Standard 1 390 13 9 14 2 202 COPS E O Minimum 1 140 11 4 11 6 165 kPa bar kg cm psi 250 rpm DRIVE BELT Tension of drive belt W
179. nnec tion Revision July 2007 EM 33 2008 Sentra FUEL INJECTOR AND FUEL TUBE lt SERVICE INFORMATION gt MR20DE 3 Disconnect fuel feed hose from hose clamp 1 Quick connector cap NOTE There is no fuel return path PBIC3771E 4 With the sleeve side of quick connector release facing quick connector install quick connector release onto fuel tube 5 Insert quick connector release into quick connector until sleeve Quick connector contacts and goes no further Hold quick connector release on release Pull quick connector that position CAUTION steeve Inserting quick connector release hard will not disconnect quick connector Hold quick connector release where it contacts and goes no further Quick connector Insert and retain Quick connector Fuel tube release KBIA0702E 6 Draw and pull out quick connector straight from fuel tube CAUTION Pull quick connector holding A position Do not pull with lateral force applied O ring inside quick connector may be damaged Prepare container and cloth beforehand as fuel will leak out Avoid fire and sparks Keep parts away from heat source Especially be careful when welding is performed around them Do not expose parts to battery electrolyte or other acids Do not bend or twist connection between quick connector and fuel feed hose during installation removal To keep clean the connecting portion and to avoid dam age and foreign m
180. nstallation of Valve Oil Seal 58 Tension Adjustment ccccccceceeeeeeeeeeeeeeteteeeeeetees 13 Removal and Installation of Front Oil Seal 58 Removal and Installation 0 0 0 cee eeeeeeeeeeeeeeeeeeee 13 Removal and Installation of Rear Oil Seal 59 COMPONENT irisa aea aei radan aedini da 14 Removal and Installation of Drive Belt Auto Ten CYLINDER HEAD E A T 61 INE E E TE E E T 14 On Vehicle Service scse ese teeeeeeeeseteeesneeeenteessnaes 61 COMPONENT 2 ce deste sande egean iaae aaa a 62 AIR CLEANER AND AIR DUCT 00 16 Removal and Installation ccccccccscccssssesseesseeeaes 62 COMPONEN ia iene tiene aed ee 16 Componentysi0e gist elaine thane 64 Removal and Installation o on 16 Disassembly and Assembly 65 Revision July 2007 EM 1 2008 Sentra Inspection After Disassembly ceeeeeereees 66 INTAKE MANIFOLD ccccseseeeesseeeneeeneeees 128 CYLINDER BLOCK k zi Removal and Installation cccceeeeeeeeeeeee 128 Component Sec exciton aaiim sees a a Aa 71 EXHAUST MANIFOLD AND THREE WAY Disassembly and Assembly s cseeseeeeeees 72 CATALYST e adi eea iail aineina 132 How to Select Piston and Bearing see 80 Removal and Installation o 132 Inspection After Disassembly a e 88 OIL PAN AND OIL STRAINER 000000 134 ENGINE ASSEMBLY ssssssssseseesseensssneeeeees 99 Removal and Installa
181. nt Remove engine cover Remove ignition coil and spark plug from each cylinder Refer to EM 30 Connect an engine tachometer not required in use of CONSULT III Install a suitable compression tester with an adapter onto spark plug hole LBIA0459E e Use the adapter whose picking up end inserted to spark plug hole is smaller than 20 mm 0 79 in in diameter Otherwise it may be caught by cylinder head during removal 20 mm 0 79 in dia SBIA0533E With accelerator pedal fully depressed turn ignition switch to START for cranking When the gauge pointer stabilizes read the compression pressure and the engine rom Perform these steps to check each cylinder Compression pressure Unit kPa bar kg cm psi rpm Standard Differential limit between cylinders 1 500 15 0 15 3 217 6 200 1 200 12 0 12 2 174 200 100 1 1 15 200 CAUTION Always use fully a changed battery to obtain the specified engine speed Revision July 2007 EM 61 2008 Sentra CYLINDER HEAD lt SERVIGEINFORMATION gt ST _EMR200 If the engine speed is out of the specified range check battery liquid for proper gravity Check engine speed again with normal battery gravity If compression pressure is below minimum value check valve clearances and parts associated with combustion chamber Valve valve seat piston piston ring cylinder bore cylinder head cylinder head gasket After the checking measure the compression pressur
182. nt tube to the tube presser Use Genuine Silicone RTV Sealant or equivalent Refer to GI 42 Recommended Chemical Product and Sealant PBICOO02E 4 Apply the sealant using Tool without breaks to the specified location Tube presser WS39930000 e If there is a groove for the sealant application apply the seal ant to the groove e As for the bolt holes normally apply the sealant inside the holes If specified it should be applied outside the holes Make sure to read the text of this manual e Within five minutes of the sealant application install the mat ing component EMA0622D e If the sealant protrudes wipe it off immediately Revision July 2007 EM 115 2008 Sentra PRECAUTIONS lt SERVIGEINFORMATION gt oo o Groove LBolt hole Do not retighten after the installation e After 30 minutes or more have passed from the installation fill the engine with the specified oil and coolant Refer to MA 13 Inner side SEM159F CAUTION Follow all specific instructions in this manual Revision July 2007 EM 116 2008 Sentra PREPARATION lt SERVICE INFORMATION gt PREPARATION Special Service Tool QR25DE INFOID 000000000 1849621 The actual shapes of the Kent Moore tools may differ from those of the special service tools illustrated here Tool number Description Kent Moore No Tool name KV10111100 Removing steel oil pan and rear timing chain
183. nto fuel tube with clip attached Flange e Insert it while matching it to the axial center e Insert fuel injector so that lug B of fuel injector matches notch B of the clip Notch B e Make sure that fuel tube flange is securely fixed in flange fixing groove on the clip e Make sure that installation is complete by checking that fuel Flange injector does not rotate or come off fixing Install fuel tube assembly a Insert the tip of each fuel injector into intake manifold injector KBIAO240E b Tighten the bolts in two steps in the numerical order as shown Fuel tube assembly bolts Step 1 10 0 N m 1 0 kg m 7 ft lb Step 2 22 0 N m 2 2 kg m 16 ft lb WBIA0875E CAUTION After properly connecting fuel tube assembly to injector and fuel hose check connection for fuel leakage 5 Install the intake collector Refer to EM 128 6 Connect the fuel hose quick connector Refer to EM 128 Revision July 2007 EM 141 2008 Sentra FUEL INJECTOR AND FUEL TUBE lt SERVIGEINFORMATION gt TT QR2SDE 7 Installation of the remaining components is in the reverse order of removal INSPECTION AFTER INSTALLATION Make sure there is no fuel leakage at connections as follows 1 Apply fuel pressure to fuel lines by turning ignition switch ON with engine stopped Then check for fuel leaks at connections 2 Start the engine and rev it up and check for fuel leaks at connections NOTE Use mirrors for checking on con
184. number KV10111100 J 37228 WBIA0475E 13 Remove the oil pickup screen 14 Remove rear plate cover and four engine to transaxle bolts using power tool 15 Loosen the upper oil pan bolts in the order shown to remove upper oil pan using power tool 16 Remove upper oil pan using Tool NOTE Tap gently to cut sealant around the pan do not damage the mating surface using Tool Tool number KV10111100 J 37228 WBIA0475E INSPECTION AFTER REMOVAL e Clean the oil pickup screen to remove any foreign material INSTALLATION 1 Installation is in the reverse order of removal Paying attention to the following Revision July 2007 EM 135 2008 Sentra OIL PAN AND OIL STRAINER lt SERVIGEINFORMATION gt TT a Apply Genuine Silicone RTV Sealant or equivalent to the upper oil pan Refer to Gl 42 Recommended Chemical Product and Sealant and EM 115 Precaution for Liquid Gasket e Install the two new O rings in the upper oil pan b Tighten the upper oil pan bolts in the order as shown e NOTE Use the bolt sizes specified below M6 x 20 mm 0 79 in No 16 17 M8 x 25 mm 0 98 in No 3 4 6 11 13 14 15 M8 x 60 mm 2 36 in No 5 7 8 9 10 M8 x100 mm 3 97 in No 1 2 12 c Apply Genuine Silicone RTV Sealant or equivalent to the lower oil pan Refer to Gl 42 Recommended Chemical Product and Sealant and EM 115 Precaution for Liquid Gasket WBIA0872
185. of the same grade e If there is a corrected stamp mark on the cylinder block use it as a correct reference Engine front Q No 1 4 from left Corrected stamping __ position T i Basic Foo stamping 2 ee j position Cylinder Main bearing bore grade housing grade sBiao283E Revision July 2007 EM 188 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt RSE WBIA0900E When a Cylinder Block is Reused 1 Measure the cylinder block bore inner diameter 2 Determine the bore grade by comparing the measurement with the values under the cylinder bore inner diameter of the Piston Selection Table Select the piston of the same grade Piston Selection Table Unit mm in Grade number Mark 2 or no mark Inner diameter of cylinder bore 89 010 89 020 3 5043 3 5047 89 020 89 030 3 5047 3 5051 Outer diameter of piston skirt 88 990 89 000 3 5035 3 5039 89 000 89 010 3 5039 3 5043 NOTE e The piston is available together with piston pin as an assembly e The piston pin piston pin bore grade is provided only for the parts installed at the plant For service parts no grades can be selected Only 0 grade is available HOW TO SELECT A CONNECTING ROD BEARING When New Connecting Rod and Crankshaft are Used 1 Apply big end inside diameter grade stamped on connecting rod side face to the row in the Connecting Rod Bearing Selection Table
186. om Standard Minimum Difference limit between cylinders 1 250 12 8 181 3 250 1 060 10 8 153 7 250 100 1 0 14 250 CAUTION Always use a fully charged battery to obtain specified engine cranking speed If the engine speed is out of specified rom range check the battery Check engine speed again with a fully charged battery If compression pressure is below minimum value check valve clearances and parts associated with com bustion chamber valve valve seat piston piston ring cylinder bore cylinder head cylinder head gasket After the checking measure compression pressure again If some cylinders have low compression pressure pour small amount of engine oil into the spark plug hole of the cylinder to re check it for compression If the added engine oil improves the compression the piston rings may be worn or damaged Check the pis ton rings and replace if necessary If the compression pressure remains at low level despite the addition of engine oil the valves may be mal functioning Check the valves for damage Replace the valve or valve seat accordingly Revision July 2007 EM 167 2008 Sentra CYLINDER HEAD lt SERVICE INFORMATION gt QR25DE e If two adjacent cylinders have respectively low compression pressure and their compression remains low even after the addition of engine oil the head gasket is leaking In such a case replace the cylinder head gasket 8 Install spark plug ignition coil and harness c
187. on July 2007 EM 10 2008 Sentra NOISE VIBRATION AND HARSHNESS NVH TROUBLESHOOTING lt SERVICE INFORMATION gt MR20DE NOISE VIBRATION AND HARSHNESS NVH TROUBLESHOOTING NVH Troubleshooting Engine Noise inFo10 0000000001849571 WBIA0822E 1 Piston pin noise 2 Piston slap noise 3 Main bearing noise 4 Water pump noise 5 Timing chain and tensioner noise 6 Drive belt noise stick slipping 7 Tappet noise 8 Camshaft bearing noise 9 Connecting rod noise A Rotational mechanism B Water pump C Timing chain Revision July 2007 EM 11 2008 Sentra NOISE VIBRATION AND HARSHNESS NVH TROUBLESHOOTING lt SERVICE INFORMATION gt MR20DE D Drive belt E Crankshaft pulley F A C compressor G Water pump H Generator I Tension pulley J Valve mechanism K Valves Use the Chart Below to Help You Find the Cause of the Symptom InFo10 0000000001849672 1 Locate the area where noise occurs 2 Confirm the type of noise 3 Specify the operating condition of engine 4 Check specified noise source If necessary repair or replace these parts Operating condition of engine Location Type of Before After When j Source of Refer of noise noise warm warm start When When While noise Oneek item ence page idling racing driving up up ing Top oren ie king o C A A B Tappet Valve clearance EM 54 gine clicking noise Rocker
188. oner plunger 9 IVT control solenoid valve 10 IVT control cover 11 Camshaft sprocket EXH 12 Camshaft sprocket INT 13 Valve lifter 14 Camshaft EXH 15 Camshaft INT 16 Camshaft brackets 2 17 Camshaft brackets 5 18 Camshaft sensor bracket A Refer to INSTALLATION EM 145 REMOVAL 1 Remove the rocker cover Refer to EM 143 Removal and Installation 2 Remove the front right side tire and wheel using power tool 3 Remove the RH splash shield using power tool 4 Remove the drive belt Refer to EM 124 Removal and Installation 5 Remove the coolant overflow reservoir tank 6 Disconnect variable timing control solenoid harness connector Revision July 2007 EM 145 2008 Sentra CAMSHAFT lt SERVICE INFORMATION gt 7 Loosen the bolts in the order as shown e Remove the IVT control cover by cutting the sealant using Tool Tool number KV10111100 J 37228 8 Set the No 1 cylinder at TDC on its compression stroke with the following procedure Open the splash cover on RH under cover Rotate crankshaft pulley clockwise and align mating marks for TDC with timing indicator on front cover as shown c Atthe same time make sure that the mating marks on camshaft sprockets are lined up with the yellow links in the timing chain as shown e If not rotate crankshaft pulley one more turn to line up the mating marks to the yellow links as shown QR25DE WBIA0880E WBIA0475E SY Timing indi
189. onnectors Removal and Installation INFOID 0000000001 849645 SEC 111 WBIA0835E 1 Cylinder head assembly 2 Cylinder head gasket 3 Cylinder head bolt A Refer to INSTALLATION EM 168 REMOVAL Remove the timing chain Refer to EM 156 Removal and Installation Remove the camshafts Refer to EM 145 Remove spark plugs Refer to EM 138 Removal and Installation Remove exhaust manifold Refer to EM 132 Removal and Installation Remove cylinder head loosening bolts in the order as shown using power tool Cylinder head bolt loosening sequence AN gt 6 If necessary to transfer to new cylinder head or remove for Intake side reconditioning remove the intake manifold collector intake man ifold and fuel tube assembly Refer to EM 170 Disassembly and Assembly En gin 7 Exhaust side ron lt 2 WBIA0033E INSPECTION AFTER REMOVAL Outer Diameter of Cylinder Head Bolts e Cylinder head bolts are tightened by plastic zone tightening method Whenever the size difference between d1 and d2 exceeds the limit replace the bolts with new ones Revision July 2007 EM 168 2008 Sentra CYLINDER HEAD lt SERVICE INFORMATION gt RSE Limit d1 d2 0 23 mm 0 0091 in or less Measuring point Measuring point e If reduction of outer diameter appears in a position other than d2 use it as d2 point 0 47 55 2 17 Unit mm in WBIA0836E INSTALLATION 1 In
190. ount of thrust fore and aft direction when 100 N 10 2 kg 22 Ib force is added at the portion of 125 mm 4 92 in radius from the center of flywheel Standard 1 8 mm 0 071 in or less Revision July 2007 EM 97 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt e If measured value is out of the standard replace flywheel Movement Amount in Radial Rotation Direction Check the movement amount of radial rotation direction with the following procedure 1 Install clutch cover bolt 1 to clutch cover mating hole and place a torque wrench A on the extended line of the flywheel 9 8 Nem 2 center line 1 0 kg m lt of c gt 9 8 Nem AJIB 1 0 kg m 87 in Ib e Tighten bolt at a force of 9 8 N m 1 0 kg m 87 in lb to keep it 87 in Ib from loosening 2 Put a mating mark on circumferences of the two flywheel masses without applying any load Measurement standard points 3 Apply a force of 9 8 N m 1 0 kg m 87 in lb in each direction and mark the movement amount on the mass on the transaxle side 4 Measure the dimensions of movement amounts A and B on circumference of the flywheel on the transaxle side Limit 33 2 mm 1 307 in or less e If measured value is out of the standard replace flywheel Revision July 2007 EM 98 MR20DE PBIC4007E 2008 Sentra ENGINE ASSEMBLY lt SERVIGEINFORMATION gt 0 EMIR2007 ENGINE ASSEMBLY Co m p O n e nt INFOID 0000000001849610 SEC 112
191. piston to 60 to 70 C 140 to 158 F using a suitable tool A PBIC3231J 18 Push out piston pin using a suitable tool of an outer diameter approximately 18 mm 0 71 in PBICO262E 19 Loosen main bearing cap bolts in reverse order as shown and remove them NOTE Before loosening main bearing cap bolts measure crankshaft end play Refer to EM 88 Inspection After Disassembly lt Engine front 20 Remove main bearing caps Tap main bearing caps lightly using a suitable tool for removal CAUTION Be careful not to damage the mounting surface 21 Remove crankshaft CAUTION PBIC3235J Revision July 2007 EM 74 2008 Sentra 22 23 CYLINDER BLOCK lt SERVICE INFORMATION gt RODE e Be careful not to damage or deform signal plate 1 mounted on rear end of crankshaft A e When setting crankshaft on a flat floor surface use a block of wood to avoid interference between signal plate and the floor surface Never remove signal plate unless it is necessary to do so Pull rear oil seal out from rear end of crankshaft Remove main bearings and thrust bearings from cylinder block and main bearing caps CAUTION Identify installation positions and store them without mix PBIC3234J ing them up ASSEMBLY 1 Fully air blow engine coolant and engine oil passages in cylinder block cylinder bore and crankcase to remove any foreign material CAUTION Use a goggles to protect your eye
192. plication point both arrows a Follow illustration a to apply sealant to joint part of No 1 cam shaft bracket and cylinder head b Follow illustration b to apply sealant in a 90 degree angle to the illustration a 2 Install the rocker cover e The rocker cover gasket must be securely installed in the groove in the rocker cover 4 0 16 from the edge surface of camshaft bracket 4 0 16 from the edge surface of camshaft bracket z 10 0 39 10 0 39 Unit mm in Apply Genuine Liquid Gasket or equivalent Refer GI Section WBIA0164E 3 Tighten the rocker cover bolts in two steps in the numerical order as shown Step 1 1 96 N m 0 20 kg m 17 in Ib Step 2 8 33 N m 0 85 kg m 74 in Ib WBIA0878E 4 Connect the PCV hose and breather hose to the rocker cover If necessary install the oil filler cap and PCV valve and lubricate the PCV valve O ring with new engine oil 5 Install the ignition coils Refer to EM 137 Removal and Installation Revision July 2007 EM 144 2008 Sentra CAMSHAFT lt SERVICEINFORMATION gt LGR DEY CAMSHAFT Removal and Installation INFOID 000000000 1849637 SEC 111 130 135 0 12 5 1 3 9 TANI EO 142 14 105 0 12 5 1 3 9 WBIA0879E 1 Camshaft bracket 1 2 Washer 3 Front cover partial view 4 Chain guide 5 Chain tensioner 6 O ring s 7 Chain tensioner spring 8 Chain tensi
193. ponent 2 Remove front oil seal using a suitable tool CAUTION Be careful not to damage front cover and crankshaft INSTALLATION 1 Apply new engine oil to new front oil seal joint surface and seal lip 2 Install front oil seal so that each seal lip is oriented as shown A Dust seal lip B Oil seal lip lt 2 Engine outside 4a Engine inside PBIC3485J Install front oil seal 2 using a suitable tool with outer diameter 57 mm 2 24 in and inner diameter 45 mm 1 77 in A to the 8 0 0 5mm dimension as shown 0 0 019 in Within 0 3 mm 0 012 in toward engine front Within 0 5 mm 0 020 in toward engine rear CAUTION Be careful not to damage front cover and crankshaft e Press fit oil seal straight to avoid causing burrs or tilt ing Do not touch grease applied on oil seal lip 3 Installation of the remaining components is in the reverse order of removal Removal and Installation of Rear Oil Seal icone PBIC3729E REMOVAL 1 Remove transaxle assembly Refer to M1 17 Removal and Installation M T models CV1T 187 Removal and Installation MR20DE CVT models 2 Remove clutch cover and clutch disk M T models Refer to CL 13 3 Remove drive plate A T or CVT models or flywheel M T models Refer to EM 71 Component 4 Remove rear oil seal with a suitable tool CAUTION Be careful not to damage crankshaft and cylinder block INSTALLATION 1 Apply the liquid gasket
194. quivalent Refer to GI Section WBIAO159E 3 Install the main bearings and the thrust bearings Remove dust dirt and oil from the bearing mating surfaces of the cylinder block and lower cylinder block b Install the thrust bearings to both sides of the No 3 main bearing journal on the cylinder block e Install the thrust bearings with the oil groove facing the crank los shaft arm outside es bearing Oil groove attachment point Thrust bearing PBICO264E c Install the main bearings paying attention to their position and direction Cylinder block side i e The main bearing with an oil hole and groove goes on the cyl Ae inder block The one without them goes on the lower cylinder Journal other block Only the main bearing on the cylinder block for No 3 journal _ Af rst v has different specifications e Before installing the bearings apply engine oil to the bearing friction surface inside Do not apply oil to the back surface but thoroughly clean it e When installing align the bearing stopper to the notch Lower Cylinder block side e Make sure that the oil holes on the cylinder block and those on ae the corresponding bearing are aligned Oil hole Stopper 4 Install the signal plate to the crankshaft a Position the crankshaft and signal plate using a positioning dowel pin and tighten the bolts to specification b Remove the dowel pin CAUTION Be sure to remove dowel pin before install
195. r EM03470000 e Rotate the crankshaft so the pin corresponding to the connect ing rod to be installed is at the bottom dead center position e Apply engine oil sufficiently to the cylinder bore piston and crankshaft pin e Match the cylinder position number with the cylinder No on the connecting rod for installation e Using tool as shown install the piston with the front mark on the piston crown facing the front of the engine CAUTION Be careful not to damage the crankshaft pin resulting from an interference of the connecting rod big end 13 Install the connecting rod caps Assemble the components in their original positions e Match the stamped cylinder number marks on the connecting Oil splash Big end rod with those on the cap to install Small end diameter grade diameter grade o A Cylinder 1 E gt No wo 4 A TE code Reference code Bearing stopper groove SBIA0282E 14 Tighten the connecting rod bolt as follows Apply engine oil to the threads and seats of the connecting rod bolts CAUTION Check tightening angle Do not make judgment by visual ars6s3 inspection Tool number KV10112100 BT 8653 A WBIA0163E Step 1 27 4 N m 2 8 kg m 20 ft lb SE R 29 4 3 0 kg m 22 ft lb SE R Spec V Step 2 0N m Step 3 19 6 N m 2 0 kg m 14 ft lb Stage 2 Rotate bolts 90 degrees e Check the connecting rod side clearance Refer to EM 194 Inspection After Disassembly e Afte
196. r tightening the bolts make sure that the crankshaft rotates smoothly 15 Install flywheel M T Models or drive plate CVT Models e Install drive plate reinforcement plate and pilot converter as Drive plate shown e Using a drift with 33 mm 1 30 in diameter push pilot con Reinfocement plate verter into the end of the crankshaft Crankshaft rear end Pilot converter f a Chanferred Rounded KBIA0075E Revision July 2007 EM 187 2008 Sentra CYLINDER BLOCK lt SERVIGEINFORMATION gt ooo O 16 Install the knock sensor e Make sure that there is no foreign material on the cylinder block mating surface and the back surface of the knock sen CY sor X Knock sensor e Install the knock sensor with the connector facing lower left by Z j 45 as shown LD Engine e Do not tighten the bolts while holding the connector front e Make sure that the knock sensor does not interfere with other parts CAUTION If the knock sensor is dropped replace it with new one 17 Install the crankshaft position sensor POS 18 Installation of remaining components is in the reverse order of removal PBIC3020E How to Select Piston and Bearing InFo10 0000000001849650 DESCRIPTION Selection points Selection parts Selection items Selection methods Determined by match of cylin der block bearing housing Between cylinder block to Main bearin Main bearing grade bearing grade inner diameter of hous crankshaft 9
197. rating the engine and transaxle remove the crankshaft position sensor POS from the assembly Be sure not to damage the edge of the crankshaft position sensor POS or the ring gear teeth REMOVAL Release fuel pressure Refer to EC 592 Fuel Pressure Check Disconnect the fuel rail at the fuel hose quick connector engine side Refer to EM 128 Drain the engine oil Refer to LU 16 Changing Engine Oil Drain the engine coolant Refer to CO 36 Changing Engine Coolant Remove the engine hood assembly Refer to BL 14 Removal and Installation Remove cowl extension Refer to El 18 Removal and Installation Remove the battery battery hold downs and battery tray Disconnect the MAF sensor electrical connector Remove the air duct and air cleaner case assembly Refer to EM 127 Removal and Installation Disconnect the heater hoses Remove engine cover using power tool Remove the engine coolant reservoir tank radiator and radiator fan assembly Refer to CO 39 Removal and Installation 13 Disconnect and set aside the IPDM ER and remove the IPDM ER bracket Refer to PG 27 Removal and Installation of IPDM E R 14 Remove the generator Refer to SC 30 Removal and Installation QR25DE 15 Remove the engine under covers and splash shield using power tool 16 Dismount the A C compressor with piping connected and secure with wire to the radiator support 17 Disconnect the engine wiring harness retainers and grou
198. re less than 588 kPa 6 kg cm2 85 psi Cleaning time less than 20 seconds Revision July 2007 EM 138 2008 Sentra SPARK PLUG lt SERVIGE INFORMATION gt RSD e Checking and adjusting plug gap is not required between change intervals If the gap is out of specification replace the spark plug Do not adjust gap Gap nominal 1 1 mm 0 043 in SMA806CA INSTALLATION Installation is in the reverse order of removal Spark Plug Types Temperature range NGK Standard type DILKAR6A 11 Gap nominal 1 1 mm 0 043 in Revision July 2007 EM 139 2008 Sentra FUEL INJECTOR AND FUEL TUBE lt SERVICE INFORMATION gt QR25DE FUEL INJECTOR AND FUEL TUBE Removal and Installation INFOID 0000000001849635 SEC 164 OJ 22 2 2 16 WBIA0874E Fuel tube protector 2 Fuel tube 3 O ring upper Fuel tube 5 Clip 6 Intake manifold adapter A Refer to INSTALLATION EM 140 CAUTION Apply new engine oil to parts before installing the parts as shown above Do not remove or disassemble parts unless instructed as shown REMOVAL 1 2 3 Release the fuel pressure Refer to EC 592 Fuel Pressure Check Remove the intake air duct Refer to EM 127 Removal and Installation Disconnect the fuel hose quick connector at the fuel tube side Refer to EM 128 CAUTION Prepare a container and cloth for catching any spilled fuel e This operation should be performed in a place that is free from
199. related parts e Install by lining up mating marks on each sprocket and timing chain as shown NOTE Before installing chain tensioner it is possible to change the position of mating mark on timing chain for that of each sprocket for alignment CAUTION For the above reason after the mating marks are aligned keep them aligned by holding them with a hand e Before and after installing chain tensioner check again to make sure that mating marks have not slipped e After installing chain tensioner remove stopper pin and make sure the tensioner moves freely e To avoid skipped teeth do not move crankshaft and camshaft until front cover is installed Install new front oil seal to front cover using suitable tool e Install new oil seal in until it is flush with front end surface of front cover CAUTION Be careful not to cause damage to circumference of oil seal EM 161 QR25DE Mating mark gt Mating mark lt orange or blue link U AY SYO yA el Crankshaft sprocket I Timing chain O Mating mark for balancer unit ee gold or yellow link KBIA0123E Mating mark peripheral stamp line Yellow link Chain guide Timing es chain Camshaft sprocket INT Yellow link Mating mark stamp 2 Camshaft sprocket EXH Chain tensioner Timing chain slack guide Timing chain tension guide Mating 9 mark lug Orange link Crankshaft key a i Crankshaft sprocket Mating
200. ressor KV101092S0 Disassembling and assembling valve J 26336 B mechanism Valve spring compressor 1 KV10109210 J 26336 20 ol I Attachment mo 2 KV10109220 72 Ms 3 KV10109230 Adapter M8 WS39930000 Pressing the tube of liquid gasket Tube presser NT052 Revision July 2007 EM 7 2008 Sentra lt SERVICE INFORMATION gt Tool number Kent Moore No Tool name PREPARATION MR20DE Description ST16610001 J 23907 Pilot bushing puller NT045 Removing crankshaft pilot bushing KV11103000 Removing crankshaft pulley Pulley puller KV991J0050 Loosening or tightening air fuel ratio A F J 44626 sensor Air fuel sensor Socket bE LBIA0444E a 22 mm 0 87 in KV10114400 J 38365 Heated oxygen sensor wrench FS NT636 Loosening or tightening rear heated oxy gen sensor a 22 mm 0 87 in KV11105210 Securing diveplate and flywheel J 44716 Stopper plate ZZA0009D KV10115600 Installing valve oil seal J 38958 Use side A Valve oil seal drift oa a 20 0 79 dia v z z Side A Side B S NT603 b 13 0 51 dia c 10 3 0 406 dia d 8 0 31 dia e 10 7 0 421 f 5 0 20 KV10115801 a Oil filter wrench Revision July 2007 S NT375 EM 8 Removing and installing oil filter a 64 3 mm 2 531 in 2008 Sentra PREPARATION lt SERVICE INFORMATION gt MR20DE Commercial Serv
201. rocedure OUT OF ROUND AND TAPER OF CRANKSHAFT e Measure the dimensions at four different points as shown on each main journal and pin journal with a micrometer Out of round is indicated by the difference in dimensions between X and Y at A and B Taper is indicated by the difference in dimension between A and B at X and Y Limit Out of round Difference between X and Y 0 0035 mm 0 0001 in Taper Difference between A and B 0 0035 mm 0 0001 in If the measured value exceeds the limit correct or replace crankshaft If corrected measure the bearing oil clearance of the corrected main journal and or pin journal Then select main bearing and or connecting rod bearing Follow the MAIN BEARING OIL CLEARANCE and or CON NECTING ROD BEARING OIL CLEARANCE procedures CRANKSHAFT RUNOUT e Place a V block on a precise flat table to support the journals on the both end of the crankshaft e Place a dial indicator A straight up on the No 3 journal e While rotating crankshaft read the movement of the pointer on the dial indicator Total indicator reading Standard 0 05 mm 0 0020 in Limit 0 10 mm 0 0040 in e If it exceeds the limit replace crankshaft PBIC3458J CONNECTING ROD BEARING OIL CLEARANCE Method by Calculation Revision July 2007 EM 94 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt MR20DE Install connecting rod
202. rts in the same way and replace if necessary Precaution for Assembly and Installation InFo10 00000000016496 18 e Use torque wrench to tighten bolts or nuts e When tightening nuts and bolts as a basic rule equally tighten in several different steps starting with the ones in center then ones on inside and outside diagonally in this order If the order of tightening is specified follow the specifications e Always replace the old with a new gasket packing oil seal or O ring e Thoroughly wash clean and air blow each part Carefully check oil or coolant passages for any restriction and blockage e Avoid damaging sliding or mating surfaces Completely remove foreign materials such as cloth lint or dust Before assembly oil sliding surfaces well e Bleed the air trapped within the system after draining the coolant Revision July 2007 EM 114 2008 Sentra PRECAUTIONS lt SERVICE INFORMATION gt QR25DE e Before starting engine apply fuel pressure to fuel lines with turning ignition switch ON with engine stopped Then make sure that there are no leaks at fuel line connections e After repairing start engine and increase engine speed to check coolant fuel oil and exhaust systems for leakage or rattles Parts Requiring Angular Tightening INFOI0 0000000001849619 e Use an angle wrench for the final tightening of the following engine parts Cylinder head bolts Lower cylinder block bolts Connecting rod cap bolts
203. s and set them aside in the order removed INSPECTION AFTER REMOVAL Camshaft Runout 1 2 3 Put the camshaft on a V block supporting the No 2 and No 5 journals Set the dial gauge vertically on the No 3 journal Turn camshaft in one direction by hand and measure the cam shaft runout on the dial gauge total indicator reading Standard Less than 0 04 mm 0 0016 in Camshaft Cam Height Revision July 2007 EM 147 QR25DE er Stopper pin Q KBIA0048 Camshaft bracket bolts loosening sequence Intake side 6 z Exhaust side Engine front lt WBIA0028E Dial gauge PBICO038E 2008 Sentra CAMSHAFT lt SERVICE INFORMATION gt RSD 1 Measure the camshaft cam height Standard intake cam height 44 815 45 005mm 1 7644 1 7718 in Standard exhaust cam height 43 975 44 165 mm 1 7313 1 7388 in 2 If wear is beyond the limit replace the camshaft Micrometer PBICOO39E Camshaft Journal Clearance Outer Diameter of Camshaft Journal e Measure the outer diameter of the camshaft journal Standard No 1 outer di 27 935 27 955 mm ameter 1 0998 1 1006 in Standard No 2 3 4 5 23 435 23 455 mm outer diameter 0 9226 0 9234 in Micrometer PBICO040E Inner Diameter of Camshaft Bracket e Tighten the camshaft bracket bolts to the specified torque following the tightening pattern as shown Follow Step 4 of INSTALLA TION of
204. s and crankshaft arm when crankshaft is moved fully forward or backward with a dial indicator A Standard 0 10 0 26 mm 0 0039 0 0102 in Limit 0 30 mm 0 012 in e If the measured value exceeds the limit replace thrust bearings and measure again If it still exceeds the limit replace crankshaft also PBIC3252J CONNECTING ROD SIDE CLEARANCE Revision July 2007 EM 88 2008 Sentra CYLINDER BLOCK lt SERVIGEINFORMATION gt SS _EMR200 e Measure the side clearance between connecting rod and crank shaft arm with a feeler gauge A Standard 0 20 0 35 mm 0 0079 0 0138 in Limit 0 40 mm 0 0157 in e If the measured value exceeds the limit replace connecting rod and measure again If it still exceeds the limit replace crankshaft also PISTON TO PISTON PIN OIL CLEARANCE Piston Pin Hole Diameter Measure the inner diameter of piston pin hole with an inside micrometer A Standard 19 993 19 999 mm 0 7871 0 7874 in PBIC3265J Piston Pin Outer Diameter Measure the outer diameter of piston pin with a micrometer A Standard 19 989 19 995 mm 0 7870 0 7872 in PBIC3266J Piston to Piston Pin Oil Clearance Piston to piston pin oil clearance Piston pin hole diameter Piston pin outer diameter Standard 0 002 0 006 mm 0 0001 0 0002 in e If oil clearance is out of the standard replace piston and piston pin assembly e When replacing piston and piston pin assembly
205. sassembly and Assembly for the tightening procedure Measure the inner diameter of main bearing housing with a bore gauge Measure the position shown 5 mm 0 20 in backward from main bearing housing front side in the 2 directions as shown The smaller one is the measured value 1 Cylinder block 2 Main bearing cap lt Engine front Standard 55 997 56 017 mm 2 2046 2 2054 in If out of the standard replace cylinder block and main bearing PBIC4005E caps assembly NOTE Revision July 2007 EM 92 2008 Sentra CYLINDER BLOCK lt SERVIGEINFORMATION gt SS __EMIR200 Main bearing caps cannot be replaced as a single because it is machined together with cylinder block PISTON TO CYLINDER BORE CLEARANCE Cylinder Bore Inner Diameter e Using a bore gauge A measure the cylinder bore for wear out of round and taper at six different points on each cylinder X and Y directions at A B and C Y is in longitudinal direction of engine NOTE When determining cylinder bore grade measure the cylinder bore X direction at B position Standard inner diameter 84 000 84 020 mm 3 3071 3 3079 in Out of round Difference between X and Y 0 015 mm 0 0006 in Taper limit Difference between A and C 0 01 mm 0 0004 in If the measured value exceeds the limit or if there are scratches and or seizure on the cylinder inner wall replace cylinder b
206. se order of removal Paint mark Crankshaft pulley Crankshaft pulley bolt Angle mark SBIAO268E Revision July 2007 EM 163 2008 Sentra OIL SEAL lt SERVICE INFORMATION gt LRRD OIL SEAL Removal and Installation of Valve Oil Seal E REMOVAL 1 Remove camshaft Refer to EM 145 Removal and Installation 2 Remove valve lifter Refer to EM 145 Removal and Installation 3 Rotate crankshaft and set piston whose oil seal is to removed to top dead center This prevents valve from dropping inside cylinder CAUTION When rotating crankshaft be careful to avoid scarring the front cover with the timing chain 4 Remove valve collet valve spring retainer and valve spring using Tool Tool number KV10116200 J 26336 B KV10115900 J 26336 20 WBIA0477E 5 Remove valve oil seal using Tool Tool number KV10107902 J 38959 WBIA0478E INSTALLATION 1 Apply new engine oil to new valve oil seal joint surface and seal lip 2 Press in valve oil seal to the position shown using Tool Oil seal installed height 12 1 mm 0 476 in Tool number KV10115600 J 38958 WBIA0892E 3 Installation of the remaining components in the reverse order of removal Removal and Installation of Front Oil Seal eom cneieietaaeeae REMOVAL 1 Remove the following parts e Engine under cover using power tools Revision July 2007 EM 164 2008 Sentra OIL SEAL lt SERVICE INFORMATION gt e Drive belts
207. shing repairs Refer to EC 590 Idle Air Volume Learning Revision July 2007 EM 131 2008 Sentra EXHAUST MANIFOLD AND THREE WAY CATALYST lt SERVIGEINFORMATION gt TT o EXHAUST MANIFOLD AND THREE WAY CATALYST Re m oval a nd n stal lat i O n INFOID 0000000001849631 14 7 1 5 11 af Eso 5 1 37 AN 6 O WBIA0865E Exhaust manifold gasket 2 Heated oxygen sensor 1 3 Exhaust manifold cover upper and lower Air fuel ratio A F sensor 1 5 Exhaust manifold cover lower bolt 6 Air fuel ratio A F sensor 2 Heated oxygen sensor 2 8 Exhaust manifold assembly REMOVAL 1 Remove the engine undercover and engine side covers 2 Remove generator and generator bracket Refer to SC 30 Removal and Installation QR25DE 3 Remove the exhaust front tube Refer to EX 6 Removal and Installation 4 Remove oil level indicator tube 5 Disconnect the electrical connector of heated oxygen sensor 1 or air fuel ratio A F sensor 1 and unhook the harness from the bracket and middle clamp on the cover 6 Remove the heated oxygen sensor 1 or air fuel ratio A F sen sor 1 using Tool Tool numbers J 44626 KV10117100 J 36471 A CAUTION Be careful not to damage heated oxygen sensor or air fuel ratio A F sensor Discard any heated oxygen sensor or air fuel ratio A F sensor which has been dropped from a height of more than 0 5 m 19 7 in onto a hard surface such as a con a1 crete floor use a new one 7
208. side the standard replace flywheel SBIA0288E Revision July 2007 EM 203 2008 Sentra SERVICE DATA AND SPECIFICATIONS SDS lt SERVICE INFORMATION gt SERVICE DATA AND SPECIFICATIONS SDS Standard and Limit GENERAL SPECIFICATIONS Model QR25DE INFOID 000000000 1849652 SE R SE R Spec V Cylinder arrangement In line 4 Displacement cm in 2 488 151 82 Bore and stroke mm in 89 0 x 100 3 50 x 3 94 Valve arrangement DOHC Firing order 1 3 4 2 Number of piston rings ek Oil 1 Compression ratio 9 5 10 5 1 Standard 1 250 12 8 181 3 Compression pressure kPa Minimum 1 060 10 8 153 7 kg cm psi 250 rpm Differential limit be tween cylinders 10001 0514 Valve timing PBIC0187E Unit degree a b c d e f 224 244 0 64 3 41 DRIVE BELTS Tension of drive belts Auto adjustment by auto tensioner INTAKE MANIFOLD AND EXHAUST MANIFOLD Unit mm in Description Limit Intake manifold collector 0 1 0 004 Surface distortion Intake manifold 0 1 0 004 Exhaust manifold 0 3 0 012 SPARK PLUG Unit mm in Make NGK Type Standard DILKAR6A 11 Gap nominal 1 1 0 043 CYLINDER HEAD EM 204 2008 Sentra Revision July 2007 SERVICE DATA AND SPECIFICATIONS SDS lt SERVICE INFORMATION gt Nominal cylinder head height H 129 4 mm 5 09 in PBICO0283E QR25DE Uni
209. sioner is within the usable range NOTE e Check the drive belt auto tensioner indicator notch when the engine is cold e When the new drive belt is installed the range of possible use should be as shown e Visually check entire belt for wear damage or cracks e If the indicator is out of allowable use range or belt is damaged replace the belt Tension Adjustment INFOID 0000000001 849626 e Belt tension is not manually adjustable it is automatically adjusted by the drive belt auto tensioner Removal and Installation INFOID 000000000 1849627 REMOVAL 1 While securely holding the hexagonal part in pulley center of Alto tensioner pulley _ Heidteskess drive belt auto tensioner move in the direction of arrow loosen s 5 s ing direction of tensioner using Tool SIL Tool number J 46535 CAUTION Avoid placing hand in a location where pinching may occur if the holding tool accidentally comes off Do not loosen the auto tensioner pulley bolt Do not turn it counterclockwise If turned counterclockwise the com plete auto tensioner must be replaced as a unit including WBIAQS61E pulley Revision July 2007 EM 124 2008 Sentra DRIVE BELTS lt SERVICE INFORMATION gt LRG 2 Insert a rod approximately 6 mm 0 24 in in diameter through the rear of tensioner into retaining boss to lock tensioner pulley e Leave tensioner pulley arm locked until belt is installed again 3 Loosen auxiliary drive belt from water pu
210. st 0 030 0 063 0 0012 0 0025 Projection length L Valve Seat Revision July 2007 EM 106 13 35 13 65 0 526 0 537 2008 Sentra SERVICE DATA AND SPECIFICATIONS SDS lt SERVICE INFORMATION gt g L MR20DE Unit mm in YX h d PBIC2745E Items Standard Oversize 0 5 0 02 Service Intake 34 700 34 727 1 3661 1 3672 35 200 35 227 1 3858 1 3869 Cylinder head seat recess diameter D Exhaust 28 700 28 727 1 1299 1 1310 29 200 29 227 1 1496 1 1507 Intake 34 808 34 824 1 3704 1 3710 35 308 35 324 1 3901 1 3907 Valve seat outer diameter d Exhaust 28 808 28 824 1 1342 1 1348 29 308 29 324 1 1539 1 1545 Valve seat interference fit 0 081 0 124 0 0032 0 0049 gt Intake 31 8 1 252 Diameter d1 A ERON Exhaust 25 3 0 996 A Intake 33 1 33 6 1 303 1 323 Diameter d2 TA Exhaust 26 9 27 4 1 059 1 079 Intake 60 Angle a1 Exhaust 45 Angle a2 88 45 90 15 Angle a3 120 i Intake 1 0 1 4 0 039 0 055 Contacting width W ce Exhaust 1 2 1 6 0 047 0 063 sigan Intake 5 9 6 0 0 232 0 236 5 03 5 13 0 1980 0 2020 eight h 3 Exhaust 5 9 6 0 0 232 0 236 4 95 5 05 0 1949 0 1988 Intake 6 04 0 2378 Depth H Exhaust 6 05 0 2382 Diameter made by intersection
211. stall a new cylinder head gasket 2 Follow the steps below to tighten the cylinder head bolts using Tool in the numerical order as shown intake side e Apply new engine oil to the threads and the seating surfaces of bolts CAUTION e If cylinder head bolts are re used check their outer diam 0 eters before installation Follow the Outer Diameter of Cylinder Head Bolts procedure QO e Check and confirm the tightening angle by using angle wrench or protractor Avoid judgment by visual inspec Engine tion without the tool front Exhaust side ate Step a 98 1 N m 10 kg m 37 ft lb Cylinder head bolt loosening sequence Step c Loosen to 0 N m in the reverse order of tight Intake side ening Stepd 39 2 N m 4 0 kg m 29 ft lb Stepe 75 clockwise Step f 75 clockwise E Exhaust side front lt WBIA0033E Tool number KV10112100 BT 8653 A KV10112100 3 Installation of the remaining components is in reverse order of removal Revision July 2007 EM 169 2008 Sentra CYLINDER HEAD lt SERVICE INFORMATION gt RSE Disassembly and Assembly INFO1D 0000000001849646 SEC 111 130 220 Always replace after every disassembly Apply Genuine Liquid Gasket or equivalent Lubricate with new engine oil N m kg m ft lb WBIA0310E Valve collet 2 Valve spring retainer 3 Valve spring with valve spring seat Valve oil seal 5 Valve guide 6 Cyl
212. ster purge volume control solenoid valve Water hose 8 Water hose 9 Electronic throttle control actuator 10 Gasket A To water outlet Removal and Installation INFOID 0000000001 849583 REMOVAL 1 Remove engine cover 1 2 Drain engine coolant Refer to CO 11 Changing Engine Cool ant CAUTION Perform this step when engine is cold NOTE This step is unnecessary when putting plugs to water hoses to electronic throttle control actuator a Disconnect water hoses from electronic throttle control actuator b Remove electronic throttle control actuator CAUTION a WBIA0777E e Handle carefully to avoid any shock to electric throttle control actuator Never disassemble 3 Remove oil level gauge CAUTION Cover the oil level gauge guide openings to avoid entry of foreign materials Revision July 2007 EM 18 2008 Sentra INTAKE MANIFOLD lt SERVICEINFORMATION gt MIRE 4 Loosen and remove intake manifold 1 bolts A B lt Engine front PBIC3939E 5 Loosen bolts in reverse order as shown lt Engine front CAUTION Cover engine openings to avoid entry of foreign materials 6 Remove EVAP canister purge volume control solenoid valve from intake manifold if necessary CAUTION Handle it carefully and avoid impacts 7 Remove intake manifold WBIA0788E INSTALLATION 1 Install intake manifold NOTE Be sure the intake manifold gasket is seated correctly in groove of intake manifold 2 Tighte
213. t Refill to specified level if necessary Summary of the inspection items Item Before starting engine Engine running After engine stopped Engine coolant Level Leakage Level Engine oil Level Leakage Level Other oils and fluids Level Leakage Level Fuel Leakage Leakage Leakage Exhaust gas Leakage Transmission transaxle CVT fluid power steering fluid brake fluid etc Revision July 2007 EM 179 2008 Sentra CYLINDER BLOCK lt SERVICE INFORMATION gt CYLINDER BLOCK Disassembly and Assembly SEC 110 120 221 226 21 1 2 2 16 7 0 0 71 62 Or D a Biroor 00 QR25DE INFOID 000000000 1849649 1 Cylinder block 2 O ring 3 Knock sensor 5 Oil pressure switch Lower cylinder block bolt 8 Snap ring 9 10 Connecting rod bearing 11 Connecting rod bearing cap 12 13 Piston 14 Oil ring 15 16 Top ring 17 Piston pin 18 19 Main bearing upper 20 Crankshaft 21 22 Crankshaft rear oil seal 23 Pilot converter CVT only 24 25 Drive plate CVT 26 Reinforcement plate CVT 27 28 Cylinder block heater if equipped A Refer to ASSEMBLY EM 180 CAUTION Apply new engine oil to parts marked in illustration before installation DISASSEMBLY Revision July 2007 EM 180 la 3 108 11 80 WBIA0897E Crankshaft position sensor POS Lower cylinder block Connecting rod Connecting rod bearing cap bolt Second ring Main thrust be
214. t mm in Description Limit Head surface distortion VALVE Valve Dimensions T Margin thickness as 7a 0 1 0 004 Unit mm in D L SEM18 Intake 35 5 35 8 1 398 1 409 Valve head diameter D Exhaust 30 5 30 8 1 201 1 213 Intake 97 16 3 8252 Valve length L Exhaust 98 82 3 8905 Intake 5 965 5 980 0 2348 0 2354 Valve stem diameter d Exhaust 5 955 5 970 0 2344 0 2350 Intake Valve seat angle a 45 15 45 45 Exhaust Intake 1 1 0 043 Valve margin T Exhaust 1 3 0 051 Valve Clearance Unit mm in Hot Cold reference data Intake 0 24 0 32 0 009 0 013 0 304 0 416 0 012 0 016 Exhaust Approximately 20 C 68 F Available Valve Lifter Revision July 2007 0 26 0 34 0 010 0 013 EM 205 0 308 0 432 0 013 0 017 2008 Sentra SERVICE DATA AND SPECIFICATIONS SDS lt SERVICE INFORMATION gt QR25DE Stamp D Tyalve iter KBIA0119E Thickness mm in Identification mark Stamp 7 88 0 3102 788U 7 90 0 3110 790U 7 92 0 3118 792U 7 94 0 3126 794U 7 96 0 3134 796U 7 98 0 3142 798U 8 00 0 3150 800U 8 02 0 3157 802U 8 04 0 3165 804U 8 06 0 3173 806U 8 08 0 3181 808U 8 10 0 3189 810U 8 12 0 3197 812U 8 14 0 3205 814U 8 1
215. tching mark orange link ai fo moov gt Matching mark orange link al Matching mark outer groove NOTE There are two outer grooves in camshaft sprocket INT The wider one is a matching mark 2 Ifthe timing chain tension guide front cover side is removed install it to the front cover CAUTION Check the joint condition by sound or feeling 3 Install crankshaft sprocket 2 oil pump sprocket 3 and oil pump drive chain 1 A Matching mark stamping B Matching mark orange link C Matching mark dark blue link e Install it by aligning matching marks on each sprocket and oil pump drive chain e If these matching marks are not aligned rotate the oil pump shaft slightly to correct the position CAUTION Check matching mark position of each sprocket after installing the oil pump drive chain 4 Install chain tensioner for oil pump 1 e Fix the plunger at the most compressed position using a stop per pin A and then install it e Securely pull out the stopper pin after installing the chain tensioner for oil pump e Check matching mark position of oil pump drive chain and each sprocket again Revision July 2007 EM 42 2008 Sentra TIMING CHAIN lt SERVIGEINFORMATION gt ST _EMR200 5 Align the matching marks of each sprocket with the matching marks of timing chain Camshaft sprocket EXH Camshaft sprocket INT Timing chain Matching mark dark b
216. the locations that are out of the standard 2 3 Measure the center thickness of the removed valve lifters with a micrometer A u PBIC3195J 4 Use the equation below to calculate valve lifter thickness for replacement Valve lifter thickness calculation t t1 C1 C2 t Valve lifter thickness to be replaced t Removed valve lifter thickness Ci Measured valve clearance C2 Standard valve clearance Revision July 2007 EM 56 2008 Sentra CAMSHAFT lt SERVICE INFORMATION gt MR20DE Intake 0 30 mm 0 012 in Exhaust 0 33 mm 0 013 in e Thickness of new valve lifter B can be identified by stamp mark A on the reverse side inside the cylinder Stamp mark 302 indicates 3 02 mm 0 1189 in in thickness PBIC3196J NOTE Available thickness of valve lifter 26 sizes range 3 00 to 3 50 mm 0 1181 to 0 1378 in in steps of 0 02 mm 0 0008 in when manufactured at factory Refer to EM 103 Standard and Limit Install the selected valve lifter Install camshaft Refer to EM 46 Removal and Installation Install timing chain and related parts Refer to EM 37 Manually rotate crankshaft pulley a few rotations Make sure that the valve clearances are within the standard 0 Installation of the remaining components is in the reverse order of removal D ONO Revision July 2007 EM 57 2008 Sentra 1 OIL SEAL lt SERVICEINFORMATION gt ooo mg OIL SEAL Removal and Inst
217. thickness ing and crankshaft journal grade outer diameter of jour nal Combining service grades for A z connecting rod big end inner di Beweer crankshait t0 connect Connecting rod bearing Connecting rod bearing grade ameter and crankshaft pin outer ing rod bearing thickness diameter determine connecting rod bearing selection Piston and piston pin assembly The piston is available together with piston pin as an assembly Between cylinder block to pis ton Piston grade piston outer diam Piston grade cylinder bore eter grade inner diameter of bore Between piston to connecting rod For the service parts the grade for fitting cannot be selected between a piston pin and a connecting rod Only 0 grade is available The information at the shipment from the plant is described as a reference e The identification grade stamped on each part is the grade for the dimension measured in new condition This grade cannot apply to reused parts e For reused or repaired parts measure the dimension accurately Determine the grade by comparing the measurement with the values of each selection table e For details of the measurement method of each part the reuse standards and the selection method of the selective fitting parts follow the applicable procedures HOW TO SELECT A PISTON When New Cylinder Block is Used e Check the cylinder bore grade on rear left side of cylinder block and select a piston
218. tion c ccccsssscesseseeseeeees 134 COMPONCMAL soat ani Aa TA 99 Removal and Installation c cccccccsccecssessesecessereeeees 99 IGNITION COIL sssssssunsennnennnnunnnnunnnnnnnnnnnnnnnnnnne 137 Removal and Installation cccceeeeeeeeeeeee 137 SERVICE DATA AND SPECIFICATIONS SDS e ae nae e a 103 SPARK PLUG nssasonnussennnrernennrnnrnerernnrnrnnnnenernena 138 Standard and Limit ast coceascad ashen cves teh aetecuts 103 Removal and Installation scesseeeeeeeeees 138 QR25DE FUEL INJECTOR AND FUEL TUBE 140 SERVICE INFORMATION cccccccccccooocccceee 114 Removal and Installation cccccccccceeeeeseeeeeeeaes 140 PRECAUTIONS ounscsssssssssssssssssssssssssssssesssssessses 114 ROCKER COVER o ssssssscsssssssssessesessssssesseenenen 143 Precaution for Supplemental Restraint System Removal and Installation cccceeeeeeeeeeeeee 143 SRS AIR BAG and SEAT BELT PRE TEN CAMSHAFT aaiae aeaa danna aaa raa aaaea in 145 SIONER eee ere reer ae Pere TeeTeTeTeererereere reer ere rere ee ee eee eee ee 1 14 Removal and Installation oti td seit ata ends 4a we on Ay 145 Precaution for Draining Coolant eeeeesee 114 Inspection After Installation ccccccceeeeeeees 152 Precaution for Disconnecting Fuel PIPING 114 Valve Clearance ecccccccsccesseeecssesesseeecssaeeseaeees 153 Precaution for Removal and Disassembly 114 Precaution for Inspection Repair a
219. to SC 8 Lift with a hoist and position above engine Separate the engine and the transaxle Refer to CVT 187 Removal and Installation MR20DE CVT models or CVT 187 Removal and Installation MR20DE M T models INSTALLATION Note the following and install in the reverse order of removal e Do not allow engine oil to get on engine mounting insulator Be careful not to damage engine mounting insu lator Revision July 2007 EM 101 2008 Sentra ENGINE ASSEMBLY lt SERVICE INFORMATION gt MR20DE e When installation directions are specified install parts according to the directions Refer to EM 99 Compo nent e Make sure that each mounting insulator is seated properly and tighten nuts and bolts e Tighten engine mounting insulator RH bolts in the numerical order shown lt q Vehicle front WBIA0828E INSPECTION AFTER INSTALLATION Inspection for Leaks The following are procedures for checking fluids leak lubricates leak and exhaust gases leak e Before starting engine check oil fluid levels including engine coolant and engine oil If less than required quantity fill to the specified level Refer to MA 13 e Use procedure below to check for fuel leakage Turn ignition switch ON with engine stopped With fuel pressure applied to fuel piping check for fuel leak age at connection points Start engine With engine speed increased check again for fuel leakage at connection points e Run e
220. tor joint e Direct arrow mark on quick connector cap to upper side fuel hose side 6 Install fuel hose to hose clamp When fitted 2nd level spool KBIA0272E connector cap 4 Fuel tube side KBIA0298E CONNECTING QUICK CONNECTOR ON THE FUEL HOSE VEHICLE PIPING SIDE 1 Make sure no foreign substances are deposited in and around the fuel tube and quick connector and there is no damage to them 2 Align center to insert quick connector straight into fuel tube e Insert fuel tube until a click is heard e Install quick connector cap on quick connector joint Direct arrow mark on quick connector cap upper side e Install fuel hose to hose clamp Quick connector cap 4 Fuel tube side PBIC0662E INSPECTION AFTER INSTALLATION Make sure there is no fuel leakage at connections as follows 1 Apply fuel pressure to fuel lines by turning ignition switch ON with engine stopped Then check for fuel leaks at connections 2 Start the engine and rev it up and check for fuel leaks at connections NOTE Use mirrors for checking on connections out of the direct line of sight CAUTION Do not touch engine immediately after stopping as engine is extremely hot e Perform procedures for Throttle Valve Closed Position Learning after finishing repairs Refer to EC 590 Throttle Valve Closed Position Learning e If electric throttle control actuator is replaced perform procedures for Idle Air Volume Learning after fini
221. tor reading Limit 0 15 mm 0 0059 in e If it exceeds the limit replace camshaft sprocket PBIC3182J Valve Lifter Check if surface of valve lifter has any wear or cracks e If anything above is found replace valve lifter Refer to EM 54 Valve Clearance 4 KBIA0182E Valve Lifter Clearance VALVE LIFTER OUTER DIAMETER e Measure the outer diameter of valve lifter with a micrometer A Standard Intake 33 977 33 987 mm 1 3377 1 3381 in Exhaust 29 977 29 987 mm 1 1802 1 1806 in PBIC3185J VALVE LIFTER HOLE DIAMETER Measure the diameter of valve lifter hole of cylinder head with an inside micrometer A Standard Intake 34 000 34 021 mm 1 3386 1 3394 in Exhaust 30 000 30 021 mm 1 1811 1 1819 in VALVE LIFTER CLEARANCE e Valve lifter clearance Valve lifter hole diameter Valve lifter outer diameter PBIC3184J Standard 0 013 0 044 mm 0 0005 0 0017 in e If out of the standard referring to the each standard of valve lifter outer diameter and valve lifter hole diame ter replace either or both valve lifter and cylinder head INSTALLATION 1 Install valve lifters e Install them in the original positions 2 Install camshafts Revision July 2007 EM 50 2008 Sentra CAMSHAFT MR20DE lt SERVICE INFORMATION gt e Clean camshaft journal to remove any foreign material e Distinguish between the intake and the exhaust by looking at the different
222. ure CAUTION Never rotate crankshaft Remove main bearing cap and bearings and using the scale A on the plastigage bag measure the plastigage width NOTE The procedure when the measured value exceeds the limit is same as that described in the Method by Calculation MAIN BEARING CRUSH HEIGHT e When main bearing cap is removed after being tightened to the specified torque with main bearings 1 installed the tip end of bearing must protrude B Refer to EM 72 Disassembly and Assembly for the tightening procedure A Example Standard There must be crush height If the standard is not met replace main bearings PBIC3279J CONNECTING ROD BEARING CRUSH HEIGHT e When connecting rod bearing cap is removed after being tightened to the specified torque with connecting rod bearings 1 installed the tip end of bearing must protrude Refer to EM 72 Disassem bly and Assembly for the tightening procedure B A Example Standard There must be crush height e If the standard is not met replace connecting rod bearings PBIC3279J MAIN BEARING CAP BOLT OUTER DIAMETER Revision July 2007 EM 96 2008 Sentra CYLINDER BLOCK lt SERVICEINFORMATION gt MIRE e Measure the outer diameters d1 d2 at two positions as shown A d1 measuring position B d2 measuring position e If reduction appears in places other than B range regard it as d2 Limit d1
223. ure that engine oil comes out from intake valve timing control solenoid valve hole A End crank after checking e Check engine oil leakage by oil amount adhered to the waste inserted into the oil hole WARNING Be careful not to touch rotating parts drive belts idler pulley and crankshaft pulley etc CAUTION Do not perform cranking without installing right engine mount bracket right engine mount insu lator and right torque rod e Prevent splashing by using a shop cloth so as to prevent the worker from injury from engine oil and so as to prevent engine oil contamination e Prevent splashing by using a shop cloth so as to prevent engine oil from being splashed to engine and vehicle Especially be careful not to apply engine oil to rubber parts of drive belts engine mounting insulator etc Wipe engine oil off immediately if it is splashed 7 Perform the following inspection if engine oil does not come out from intake valve timing control solenoid valve oil hole of the cylinder head e Remove oil filter for intake valve timing control and then clean it Refer to LU 8 e Clean oil groove between oil strainer and intake valve timing control solenoid valve Refer to LU 4 Lubrication Circuit 8 Remove components between intake valve timing control solenoid valve and camshaft sprocket INT and then check each oil groove for clogging e Clean oil groove if necessary Refer to LU 4 Lubrication Circuit 9 Installation of
224. ution for Disconnecting Fuel Piping INFOID 0000000001849563 Before starting work make sure no fire or spark producing items are in the work area e Release fuel pressure before disassembly e After disconnecting pipes plug openings to stop fuel leakage Precaution for Removal and Disassembly INFOID 0000000001849564 e When instructed to use special service tools use the specified tools Always be careful to work safely avoid forceful or uninstructed operations e Exercise maximum care to avoid damage to mating or sliding surfaces e Cover openings of engine system with tape or the equivalent if necessary to seal out foreign materials e Mark and arrange disassembly parts in an organized way for easy troubleshooting and assembly e When loosening nuts and bolts as a basic rule start with the one furthest outside then the one diagonally opposite and so on If the order of loosening is specified do exactly as specified Power tools may be used where noted in the step Precaution for Inspection Repair and Replacement INFOID 0000000001849565 e Before repairing or replacing thoroughly inspect parts Inspect new replacement parts in the same way and replace if necessary Precaution for Assembly and Installation INFOID 0000000001849566 Use torque wrench to tighten bolts or nuts to specification When tightening nuts and bolts as a basic rule equally tighten in several different steps starting with the ones in center then ones on
225. ve pilot converter 1 using Tool A CVT models J Z 7 RY iy Tool number ST16610001 J 23907 S E N P NOTE X YAR y M T models have no pilot converter R S S PBIC3229J N Position crankshaft pin corresponding to connecting rod to be removed onto the bottom dead center NOTE Before removing piston and connecting rod assembly check the connecting rod side clearance Refer to EM 88 Inspection After Disassembly Remove connecting rod cap Using a suitable tool push piston and connecting rod assembly out to the cylinder head side CAUTION e Be careful not to damage matching surface with connect ing rod cap e Be careful not to damage the cylinder wall and crankshaft pin resulting from an interference of the connecting rod big end PBIC0259E Remove connecting rod bearings CAUTION When removing them note the installation position Keep them in the correct order Remove piston rings form piston e Before removing piston rings check the piston ring side clearance Refer to EM 88 Inspection After Disassembly Using a suitable tool A remove piston rings CAUTION When removing piston rings be careful not to damage the piston Be careful not to damage piston rings by expanding them excessively PBIC3233J Revision July 2007 EM 73 2008 Sentra CYLINDER BLOCK lt SERVICEINFORMATION gt MIRE 16 Using snap ring pliers A remove snap rings PBIC3230J 17 Heat
226. y shorter than the bearing width and place it in crankshaft axial direction avoiding oil holes Install the connecting rod bearings to the connecting rod cap and tighten the connecting rod bolts to the specified torque CAUTION Never rotate the crankshaft Remove the connecting rod cap and bearings and using the scale on the Plastigage bag measure the Plastigage width NOTE The procedure when the measured value exceeds the limit is same as that described in the method by calculation OIL CLEARANCE OF MAIN BEARING Method of Measurement e Install the main bearings to the cylinder block and bearing cap Measure the main bearing inner diameter with the bearing cap bolt tightened to the specified torque Oil clearance Inner diameter of main bearing Outer diameter of crankshaft journal Standard No 1 3 and 5 journals 0 012 0 022 mm 0 0005 0 0009 in No 2 and 4 journals 0 018 0 028 mm 0 0007 0 0011 in Limit 0 1 mm 0 004 in e If the measured value exceeds the limit select main bearings referring to the main bearing inner diameter and crankshaft journal outer diameter so that the oil clearance satisfies the standard Refer to EM 188 How to Select Piston and Bearing Method of Using Plastigage e Remove oil and dust on the crankshaft journal and the surfaces of each bearing completely e Cut the Plastigage slightly shorter than the bearing width and place it in crankshaft axial directio

Removal and Installation

Contents

Download Pdf Manuals

Related Search

Related Contents