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Service Manual Emission Control System 1972 models revised

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2. asz gt 1 a 5 AMMETER E FOGL RH ST MOTOR As 9 FUEL GAUGE D RADIO F Hips HEAT GLASS OIL P GAUGE l TS ASt EE TR meno YS FLASH E NUS DEOR SW R COMB L LH 27 RL T x HORN i THERMO Sw R L 2 0 z J AUTO HAZARD s p SPEEDO METER HH COS illl SEE BRAKE IN t STEPL LH SIDE RB arema BRAKE SW THERMO RELAY STOP SW NI ud BS TAS iz R gt GL RIT GR PARKING 8 7 58 SIDE F L H AUTO ANTENNA SW ANTENNA IGN puce COMB SW m 5 6 71319 E BUZZER HAZARD SW INHIBITOR SW WIPER MOTOR IGN SW AUTO T M INDICATOR LAMP EC 101 AUTO T M SIDE M LAMPLH MANUAL COLOR CODE Black White Red Yellow Green Blue
3. vehicle M T vehicle Racing Raise the engine speed up to 3 000 to 3 500 rpm under no load and close the throttle valve by releasing 1t from hand At this moment the negative pressure of manifold rises above 23 6 1n Hg and then gradually falls 600 rpm D range 700 rpm neutral Warming up operation Continue warming up operation until the engine reaches its normal operating temperature Connecting vacuum gauge Connect rubber hose between vacu um gauge and intake manifold as shown Rubber hose Adjustment of idling Adjust the engine at normal idle setting 7 BIDC 7 down to the pressure of idling about 19 7 in Hg The process of this pressure fall takes one of the three forms as illustrated in Figures EC 100 102 and EC 103 according to the dif ference of the operating pressure of BCDD Excessive operating pressure of B C D D Negative pressure Idling negative pressure Time Negative pressure Set pressure Idling negative pressure Time ECO61 Fig EC 100 Characteristic curve high negative pressure EC 47 1 When the operating pressure 15 too high BCDD remains inoper ative and negative pressure decreases without being sustained while it 15 falling just like that of the engine on which a BCDD is absent See diagram 2 When the operating pressure 15 lower than that of the case of A but 15 higher than the set pressu
4. LT E HH x zo ve ome Hnc O HHE nes deri TEMP SW TURN SIGNAL SW 13 AUTO o zt rrr B HEATER Seat TAIL AUTO CHOKE RELAY OIL PRESS Lge TURN SW 6 STOP c dle 4 DEFRISTER L T REAR RELAY LAMP RH Canada only Effective with Aug 1971 5 Gr i LICENSE LAMP CARBURETOR AR it R COMB HEAD LAMP wR CAMP UH LW BACK U LH RW STOP RP ANTENNA TURN LH COMBINEO INSTRUMENT CIG OSs L E GB PARK 8 TURN 11114 LAMP LH X ENG ROOM SPARK PLUGS HEATER SW LAMP BR I RADIO SIDE MARKER WASHER LAMP CHE MOTOR L GLOVE BOX HEATER UNIT X MEANS OPTIONAL PARTS EC 98 DOOR SWLH COLOR CODE Black White Red Yellow Green Blue MODEL WPL510AU PARK 8 TURN LAMP RH HEAD LAMP LH R R R GB PARK TURN LAMP LH roz WIRING DIAGRAM HAZARD B HEAD LAMP FLASHER BODY EARTH INDICATOR RELAY RELAY L F LAMP RR HORN RELAY WIPER M DOOR SW j 2 0 gms ERI pc s P 5 10 o o 50 E ex RI 85 ET Too S HAZARD WARNING SW ee 8 0 8 I r7 ER or
5. more at the standard Add mineral free water distilled water as required to EMISSION CONTROL SYSTEM bring electrolyte up to proper level Clean battery posts and cable termi nals After tightening clamps coat the battery posts and clamps shghtly with grease to retard corrosion Air cleaner element The paper element has been special ly treated and therefore there 5 no need to clean t But it should be replaced every 24 000 miles CRANKCASE EMISSION CONTROL SYSTEM 1 Check hoses and hose connec tions for leaks 2 Disconnect ali hoses and blow them out with compressed air If any hose can not be cleared of obstructions replace with a new one 3 Testing of the crankcase ventila tion control valve With engine running at idle remove the ventilator hose from the crankcase ventilation control valve If the valve 15 working a hissing noise will be heard as passes through the valve and a strong vacuum should be felt immedi ately when a finger 15 placed over the valve inlet If valve is clogged do not attempt to clean Replace with a new valve Check for deposit clogging in the hose Clean if necessary AIR INJECTION SYSTEM The following procedures are re commended for checking and or fying that the various components of the exhaust emission control system are operating properly The engine and all components must be at normal operating temper atures when the tests are performed Prior to perform
6. Low pressure Breathe out control thermostat Fig EC 139 Check of manifold heat control thermostat 1 Immerse the thermostat in hot water of 175 F or above for a few minutes and blow low pressure air 1 5 to 3 pst from side adverse to the manifold Little or no bubbles from man fold side indicates normality 2 When immersed in cold water it 15 normal that the passes through the thermostat easily If operation 15 1mproper replace with a new thermostat assembly Temperature control by engine coolant 1 Before removing the carburetor carburetor insulator or intake man fold for one reason or another be sure to drain coolant of approximately US gal 1n the radiator Caution Failure to follow this rule may cause coolant to creep into the cylinders Should this occur mediately remove the spark plugs and run the starting motor until the coolant is thoroughly removed from the cylinders 2 The thermostat 1s factory adjust ed to the pre determined tempera tures Do not remove it from 15 housing unless absolutely necessary EVAPORATIVE EMISSION CONTROL SYSTEM Checking of fuel tank vapor liquid separator and vapor vent line 1 Check all hoses and fuel tank 3 way connector Cock X Flow guide valve 14 5 inAq Manometer filler cap 2 Disconnect the vapor vent line connecting flow guide valve to vapor liquid separator 3 Connect
7. Fig EC 39 Checking sensor EMISSION CONTROL SYSTEM 6 Start the engine and continue idling as described under paragraphs 1 2 and 3 above When several minutes have passed and the valve is partially opened read the thermister indication It 1s correct if the reading falls between 100 and 130 F If the reading 15 abnormal replace the sensor 7 On the engine equipped with an idle compensator as service option do as follows before replacing the sensor Clog the hose on idle compensator side by twisting or clamping it and check the temperature as given in paragraphs 5 and 6 above If the thermometer shows correct tempera ture replace the idle compensator if the reading s abnormal replace the sensor Electric automatic choke Adjustment Fast idle adjustment 1 Remove the bi metal cover 2 Place the fast idle arm on second step of the fast idle cam Then adjust the fast idle adjusting screw in such a way that the clearance of the throttle valve shown at A the illustration will 0 033 inch for manual transmission vehicle and 0 044 inch for automatic transmission vehicle Notes a engme speed does not rise sufficiently and is unstable after starting adjust the clearance until there exists a clearance of 0 004 inch wider than specified value b over speeds after start ing adjust until the clearance of 0 004 inch is obtained Fast idle cam steps Throt
8. both front and rear idle adjusting nuts by EC 73 turning them clockwise 1 8 turn at atime until the specified CO level 13 obtained Note Each carburetor is properly ad justed for a proper air fuel mixture ratio at factory 14 Disconnect the servo diaphragm vacuum tube 8 once from the con nector 4 reconnect the servo dia phragm vacuum tube 9 to the con nector 4 and make sure that the engine speed is 1 400 rpm Readjust ment is described in paragraph 13 above 1f the engine speed is not 1 400 rpm If the engine speed is in order reconnect the servo diaphragm vacuum tube 9 to the control valve connector 4 and servo diaphragm vacuum tube to the original position 15 If CO meter is not available adjust idling by turning the idle adjust nuts the procedure as described in paragraph 1 Avoid this measures unless absolutely necessary however 1 Tighten idle rdjusting nuts of both F and R carburetors upward completely Then loosen the above nuts with 3 turns Note Nozzle head falls 004 inch from jet bridge with one return of idle adjusting nut 2 Tighten the and R idle adjust ing nuts simultaneously by mately 1 8 turn and stop the nuts at the point where engine speed is the fastest and stablest The number of returns of idle adjust nuts in best condition is approximately 2 Fig EC 154 Idle adjust nuts EMISSION CONTROL SYSTEM 16 Lastly use a flow meter agan to
9. 510 Check switch II of throttle switch 2 In case of Datsun PL521 Check accelerator switch In case b is normal and a is abnormal 1 In case 510 Check switch I of throttle switch 2 In case of Datsun PL521 Check throttle switch Datsun PL510 and WPL510 with automatic transmission of Datsun 1510 1 Disconnect the lead wire of the retarded side terminal of the distrr butor and connect the ammeter between the lead wire and the retarded side terminal 2 Start the engine and the vehicle on a chassis dynamometer on the road 3 Make sure that the ammeter does not indicate zero when the vehicle speed 1s over 13 mph with a partially opened throttle position For other vehicle operations the ammeter should indicate zero 4 If the system does not work properly stop the vehicle and inspect the speed switch the throttle switch and the connection of lead wires at the switches speed detector and relay Ignition coil ECO52 Fig EC 80 Testing of dual point distributor Testing of accelerator switch PL521 1 Make sure of the insulation of the lead wire terminal to the accelerator switch body 41 2 Disconnect lead wires at switch and connect the ohmmeter to the terminals EMISSION CONTROL SYSTEM Accelerator switch Ohmmeter EC062 Fig EC 81 Testing of accelerator switch 3 ohmmeter should indicate infimty when the accelerator pedal is not depresse
10. fue MP LH so dus Re ei eel cael a iina LW REAR a RB m RB LW gig MARKER RL BL HTER X CLOCK LAMP L H 5I e COMBINED INSTRUMENT GL L COLOR CODE 198 Black PARK 8 l White LAMP LH HEATER SW poor SWLH Red ENG ROOM BR Yellow X RADIO BR F Green Blue SIDE MARKER WASHER LAMP LH MOTOR HEATER UNIT CARBURETOR EC 97 RELAY Sw WIRING DIAGRAM HAZARD B MODEL WPL510TU HEAD LAMP FLASHER Y BODY EARTH TT Mee T WIPER MOTOR L r om SP 8 Fi esa an PARK 8 TURN 6 FAMEM o 88 0 000 as GY LLL Ti by LLL R pcr uo ques 55 Seen m Elche EY HEAD LAMP po ee BY BY BL cope co EE H GW H H w ESSET SECO Zx dn a eee HIE FHH eee eel k k 8 T S En HE fe Sy ae ETHER RB pec Hn FH H YN STOP LAMP Sw 8 e M _ FLASHER UNIT E ox Xo DEFROSTER SW Canada only Effective with Aug 1971 REAR WINDOW DEFROSTER Canada only Effective with Aug 1971 eoo 20 20 J gt 1 8 c 02 cx xna
11. bearing needle bearing ST19840000 STECP20003 Attachment for pressing in For installing the needle 124 needle bearing bearing ST19850000 STECP20004 Use as a bridge for removing the relief valve by the puller Bridge for pulling out relief valve S M reference page See Fig Page EC 58 Fig EC 116 Page EC 58 Fig EC 117 Page EC 58 Fig EC 117 Page EC 60 Page 58 Fig EC 119 90 EMISSION CONTROL SYSTEM i Applied SM reference Figure Description model page See Fig No For assembling the number Former tool number Tool name ST19860000 STECP20005 Page EC 59 Fig EC 121 Dummy shaft vanes ST19870000 STECP20006 For checking the pump performance Aur pump test gauge adaptor Page EC 67 The special tools for A12 and L16 engines are not available as emission control maintenance Other necessary tester Pressure gauge Vacuum gauge Ammeter 10 Voltmeter 11 Ohmmeter 12 Compression tester 13 Cam angle dwell meter 14 Thermister 1 Carburetor 2 Engine exhaust combustion analyzer 3 Ignition analyzer oscilloscope 4 Distributor advance tester 5 Ignition timing light 6 Tachometer 7 8 9 EC 91 EMISSION CONTROL SYSTEM SERVICE JOURNAL OR BULLETIN REFERENCE SUBJECT PAGE No JOURNAL or BULLETIN No DATE 92 EMISSION
12. liquid separator 3 Connect a 3 way connector a manometer and a cock or equiv alent 3 way change cock to the end of the vent line EMISSION CONTROL SYSTEM 4 Supply fresh air into the vapor vent line through the cock little by little until the pressure becomes 14 5 inch Aq 5 Shut the cock completely and leave it that way 6 After 25 minutes measure the height of the liquid 1n the manometer 7 Variation of height should remain within 1 0 inch Aq 8 When the filler cap does not close completely the height should drop to zero in a short time 3 Way connector Cock x Flow guide valve Manometer 9 If the height does not drop to zero 1n a short time when the filler cap 1s removed it 1s the cause of the stuffy hose Note In case the vent line is stuffy the breathing in fuel tank is not thoroughly made thus causing n sufficient delivery of fuel to engine or vapor lock It must therefore be repaired or replaced 14 5 in Aq Vapor liquid separator Fuel filler cap ECO29 Fig EC 45 Checking emission control system Checking flow guide valve 1 Disconnect all hoses connected to the flow guide valve 2 While lower pressure air 1s pressed Into the flow guide valve from the ends of vent line of fuel tank side the air should go through the valve and flow to crankcase side If the air does not flow the valve should be replaced But when 15 blown from cr
13. Dumper spring oz Vacuum jet Choke spring Fast idle Alternator Make Model Capacity Distributor Make Model Condenser AF Spark plug Make Model Flow guide valve Make Model EMISSION CONTROL SYSTEM PL510TU 150 130 Electric atuo matic choke 15 HITACHI LT135 13 LT150 05 12 35 12 50 0412 81 D412 84 from Oct off line 0 22 Advance 005 Retard 510 0 4 lt PLSIOAU erst as HITACHI Opening pressure Hg 0 394 Spark timing control system Speed switch Third gear switch Throttle switch position Temp sensing switch Third gear ON 3 to 30 ON under 3 or above 30 OFF above 50 F ON under 34 F OFF Over 13 mph ON m C 83 RPLS10AU T WPL510TU p WPL510AU t t t t t Third gear t 1 13 EMISSION CONTROL SYSTEM 510 RPLSIOTU PL510AU RPL510AU WPLSIOTU WPLS10AU Tune up data Basic timing Idling speed CO percent setting Distributor dwell angle t Spark plug in 49 to 55 at point gap 00197 in 0 0315 to 0 0355 EC 84 EMISSION CONTROL SYSTEM Item Engine model Number of cylinders Type of cylinder head PL521TU L16 SOHC Displacement x bore x stroke cu in xin x in 974x3268x2902 Nominal compression rati
14. see whether the front and rear carbure tor flow volumes are equal and also ascertain that idling speed 15 adjusted to the specified rpm TROUBLE DIAGNOSES AND CORRECTIONS EXHAUST EMISSION CONTROL SYSTEM CONTENTS Aur pump EC 75 EC 74 EXHAUST EMISSION CONTROL SYSTEM preliminary Diagnosis Guide is included below as an aid in trouble shooting the exhaust emission control system Trouble Excessive backfire in exhaust system Air supply hose baked Rough engine idle Prge surgreatallspeed Probable cause Anti backfire valve vacuum line collapsed clogged disconnected or leaking Defect or malfunction of the anti backfire valve resulting in insufficient delivery to the intake manifold or insufficient duration time to the engine requirement Incorrect mixture adjustment Defect or malfunction of the spark plug or high tension cables Defective check valve on air distribution manifold Incorrect carburetor adjustment of idle speed idle mixture choke setting Incorrect basic ignition timing Leak of vacuum at anti backfire valve vacuum hine or atr inlet hose Defective or sticked anti backfire valve Defective or sticked anti backfire valve Incorrect carburetor adjustment of idle speed idle mixture choke setting EC 74 EMISSION CONTROL SYSTEM Trouble Engine stop Noisy air pump drive belt Air pump When mounted on the vehicle Noise external cause
15. trolled below the maximum allowable level Datsun PL510 WPL510 and PL521 1 Install the air cleaner 2 Warm up the engine thoroughly with the transmission the neutral gear position 3 Connect ignition tachometer and timing light 4 Set the idle speed at about 700 rpm EC 49 5 Adjust the ignition timing at 7 by conventional method 6 Operate the engine at 2 000 rpm for about 15 seconds under no load condition 7 Run the engine at idle for one minute rpm 770 rpm for the automatic transmission vehicle by the throttle adjusting screw and idle adjusting screw EMISSION CONTROL SYSTEM 9 Set the engine speed at 700 rpm 720 rpm for the automatic trans mission vehicle by turning the idle adjusting screw clockwise for a leaner mixture 10 Connect the lead wire between the advanced and the retarded side terminals of the distributor engine speed should drop by about 100 to 150 rpm 11 Check ignition timing by timing hght The timing should be at TDC 12 If the timing 15 not correct stop the engine and adjust the position of the retarded breaker point 13 Start the engine and check the ignition timing 14 If the timing is not at TDC repeat steps 12 and 13 above until it becomes TDC 15 Disconnect the lead wire be tween the advanced and the retarded side terminals of the distributor 16 Check the ignition timing The timing should remain 7 If the timing 1 not correct repeat steps 5 thr
16. CONTROL SYSTEM SERVICE JOURNAL OR BULLETIN REFERENCE SUBJECT JOURNAL or PAGE No BULLETIN No DATE EC 93 EMISSION CONTROL SYSTEM SERVICE JOURNAL OR BULLETIN REFERENCE gt 2 o lt a PAGE No JOURNAL or BULLETIN No n 4 94 WIRING DIAGRAM i MODEL LB110 FUSE BLOCK SIDE MARKER RH jaro SEE BOLT HORN L gt BODY EARTH HEAD LAMP RH P o oee REIS TANK UNIT ij en FE PARKING Wh E VS LAMP A ar CEZ e BL _ e Y 8 H mer 4 nnum LAMP IN e eee eere w COMBINATION Mau Y LAMP RH Bw Fj HAND BRAKE SW REAR COMB LAMP BW IGN SW STG LOCK FIX BOLT YG DH BRAKE CHECK SW LIGHT SW T S 8 LIGHT SW LICENSE LAMP lt lt lt lt o L 5 DISTRIBUTOR OIL PRESS OG Ot B J FLASHER UNIT SOLENOID AWO 7 CUTTING VALVE MP NA THERMAL CHOKE i TH TRANSMITTER ALTERNATOR AUTO CHOKE Pd i GR A EN panke a ERI VS LAME GR LH GL E m HAZARD UNIT e ae ay dL WASHER SW z L fp CIG LIGHTER RECEIVER HEAT
17. Flame arrester Flow guide valve This valve operates to prevent the EMISSION CONTROL SYSTEM From carburetor air cleaner From fuel tank To crankcase Flow guide valve The valve opens when the pressure 15 over 0 4 inch Hg Crankcase ventilation valve Positive sealing filler cap Vapor liquid separator ECO13 Fig EC 73 Evaporative emission control system point gap backward flow of blow by gas from the crankcase and is mounted inside the engine room and C makes are EC 38 engraved in the body of the valve to indicate the connection of the vapor vent line EMISSION CONTROL SYSTEM TROUBLE DIAGNOSES AND CORRECTIONS EXHAUST EMISSION CONTROL SYSTEM Use the following chart as aid trouble shooting the exhaust emission control system Trouble Possible cause Excessive backfire exhaust system Rough engine idle Engine surges at all speeds Incorrect idle mixture adjustment Defect or malfunction of the ignition system spark plug high tension cable breaker point ignition coil etc Incorrect ignition timing adjustment Incorrect carburetor adjustment of idle speed idle mixture choke setting Leakage of fresh air from the intake manifold Defect or malfunction of the ignition system spark plug high tension cable breaker point ignition coil etc Incorrect basic ignition timing Incorrect adjustment of cam to tappet cl
18. H R Y apicem Bun p aid rS D ew OTO pee 8 wR pie Bi 881 2 HL E eh lt A eo Le TILL IT H Horr 8B Eu H JE He Ew TE 1 E IGNITION SW Le stor e LAMP Sw C NE BEES 6 FLASHER m yg 11712 KICK DOWN SW UNIT V 6 HORN REGULATOR L gt H i du 2 BR HH J gt gt 1 x omm 4542 oc e amp t coco 000 Dao 11113 m mo Cer E L H Y 29 BRAKE INDICATOR TURN SIG AUTO SYSTEM ees 2 5 CV ITT S GB TURN DEFROSTER e an R TAIL sw H STOP Canada only gt MOVE INDICATOR RB ___ tee RELAY VB RL HHHH RL REAR COMB LU LAMP RH 7 2 lil REAR DEFROSTER STG LOCK Sw PARKING y un I YG STARTER MOTOR DEFROSTER BUZZER 8 Canada only m BR T own n YW oot SOLENOID YB UE ee et 07 ES EAR COMB
19. LT150 05 12 50 0612 53 1 NGK HITACHI BP 6ES L45PW HITACHI ECP 200 3 093 HITACHI Gulp type AV54 1B 15 to 19 sec at 19 7 1n Hg Pressure difference HITACHI CV27 2 0 1496 HITACHI FGA 3 HLS30 AU 1 4 0614 52 0 22 Advance 0 05 Retard 1 1 t f Control valve Make Model Opening negative pressure Bellows outer diameter Servo diaphragm Full stroke Type Tune up data Basic timing Idling speed CO percent setting with air pump disconnected Distributor dwell angle Spark plug gap EMISSION CONTROL SYSTEM Model 1n Hg dia in dia HLS30 U HITACHI TPA28 2 205 1 024 0 1969 5046 1 5 750 750 6 below 35 to 41 0 0315 to 0 0354 EC 89 HLS30 AU 28 4 193 0 600 600 drive 339 to 399 EMISSION CONTROL SYSTEM SERVICE TOOL Special tools necessary to perform recommended emission control maintenance are as follows Special tools for air injection pump Applied Description Tool number Former tool number Tool name ST19810000 STECP20000 9 For removing and installing Hexagon wrench L24 the rotor ring assembly ST19820000 STECP20001 lt For supporting the rotor ring Support Pared T case of needle bearing L24 5 removal and Installation ST19830000 STECP20002 For removing needle pushing out L24
20. PL521 only Transmission third gear switch Temperature sensing switch Speed switch and speed detector DESCRIPTION Effective with the 1972 model vehicles and later products the for mer AIS Air Injection System was cancelled and the new EMS Engine Modification System was employed The new system consists essentially of the following components 1 Modified combustion chamber configuration 2 Camshaft modification 3 Spark timing control system Dual point distributor Intake open deg BTDC Intake close deg ABDC Exhaust open deg BBDC Exhaust close deg ATDC Over lap deg SPARK TIMING CONTROL SYSTEM DUAL POINT DISTRIBUTOR In this system two spark timings namely Advanced and Retarded 1972 model CONTENTS EC 26 Throttle switch EC 32 EC 26 Dual point distributor EC 33 AUTOMATIC TEMPERATURE CONTROL EC 26 AIR CLEANER AT C AIR CLEANER 34 Description EC 34 EC 26 LEAN CARBURETION EC 36 ELECTRIC AUTOMATIC CHOKE EC 36 EC 29 BOOST CONTROLLED DECELERATION EC 31 DEVICE BCDD EC 36 EC 31 Description EC 36 EC 32 Performance EC 37 EC 32 4 Automatic temperature control air cleaner 5 Lean carburetion 6 Electnc automatic choke 7 Boost controlled deceleration de vice CAMSHAFT MODIFICATION Reduction of NOx has been ob tained by increasing the area of overlap 1971 model 12 48 48 54 50 14 10 26 22 are provided and they can be used independently by electrical me
21. SYSTEM 3 The valve shows correct condition if keeps underhood air inlet closed when the passage the hose 15 stop ped by twisting or clamping while applying vacuum If otherwise it 15 indication of leakage in the vacuum motor 4 When defect is found by this check replace the air cleaner as sembly Checking of sensor 1 Perform the engine test by keep ing the temperature around the sensor SYST an 1 024 Fig 38 Checking uacuum motor below 85 F Make sure that the engine Is cooled down before the test 15 conducted 2 Before running the engine make certain that the valve on underhood air side 15 fully opened 3 Start the engine and operate it at an idling speed The valve is good condition if underhood air side fully closes immediately after starting 4 Carefully watch the valve to ascertain that gradually begins to open as the engine warms up But when the ambient temperature 15 as 18 low as 30 F t takes considerable length of time for the valve to begin to open or some case it hardly opens This should not however be regarded as trouble If the valve does not operate satisfactonly or if its condition 15 questionable conduct the following test 5 Remove the air cleaner cover and put a thermister or a small thermome ter as close to the sensor as possible with adhesive tape Install the cleaner cover again
22. Tune up data Basic timing 9BTDC rpm 5 700 lt Idling speed rpm Percent setting 490 to 559 at 002 Distributor dwell angle inch of point gap Spark plug gap in 0 0315 to 0 0355 EC 81 Engine model Number of cylinders Type of cylinder head Displacement x bore x stroke uin x in x in Nominal compression ratio Recommended fuel grade Transmission type lst 2nd 3rd 4th Rev Final gear ratio Curb weight lb Type of crankcase emission control Type of exhaust emission control Carburetor Make Model Type Barrel Bore in dia Large venturi dia Small venturi Ist in dia 2nd in dia Mann jet Main air bleed Slow jet Slow air bleed SE z gt EMISSION CONTROL SYSTEM PLS10TU L16 4 in line SOHC 974x3268 x 2902 85101 F4W63L 3 382 2013 1312 3 364 3 900 2 149 Closed type HITACHI DAH328 2A m BS zd 85 5 B 3H Secondary 102 1260 6 gt a N Se gt jjo RPL510TU PL510AU RPL510AU Mi EC 82 WPLSIOTU F4W63L 3 657 2177 1 419 3 638 2 260 DAH328 2A WPLSIOAU Wet 3N71B 2458 1458 1 000 2182 3 889 2 315 lt _ DAH328 1A lt 150 130 100 Item Power jet Injection volume cu mn
23. a 3 way connector a manometer and a cock or an equi valent 3 way change cock to the end of the vent hne 4 Supply fresh air into the vapor vent line through the cock httle by httle until the pressure becomes 14 5 inch Aq 5 Shut the cock completely and leave t that way 6 After 25 minutes meausre the height of the liquid in the manometer 7 Variation of height should remain within 10 inch Aq 8 When the filler cap does not close completely the height should drop to zero a short time 9 When the filler cap 5 removed and the height does not drop to zero in a Short time it is the cause of the stuffy hose Note When the vent line 15 stuffy the breathing m fuel tank 15 not thor oughly made thus causing insuf ficient delivery of fuel to engine or vapor lock It must therefore be repaired or replaced Vapor liquid separator Fuel filler cap 029 Fig 140 Checking of evaporative emission control system EC 70 EMISSION CONTROL SYSTEM Checking of flow guide valve 1 Disconnect hoses from the flow guide valve 2 While lower pressure air 15 pressed into the flow guide valve from the ends of vent line of fuel tank side air should go through the valve and flow to crankcase side If air does not flow ADJUSTING ENGINE IDLING AND GAS MIXTURE the valve should be replaced But when 5 blown from crankcase side it should never flow to other two vent lines 3 While air is pressed into the flo
24. addition to the air injection system certain controls have been Incorporated to assure reliable system operation as follows Anti backfire valve This valve 15 controlled by intake manifold vacuum and 15 used to prevent exhaust system backfire at the initial duration of deceleration At that time the mixture in the intake manifold is too to burn and ignites when combined with injected air in the exhaust manifold The anti backfire valve is used to provide a supply of air into the intake manifold thereby making the air mixture leaner to prevent backfire A schematic of anti backfire valve 1s shown in Figure EC 113 The anti backfire valve 15 connected to the air pump discharge line and outlet to the intake manifold By burning this rapidly evaporated fuel within the cylinder some contn bution to emission reduction can also be expected If the valve does not work properly the fuel mixture will go through the combustion chambers without being ignited meet fresh air and at high temperature backfiring will result Pressure air from pump PEDE 224 discharge o to intake manifold intake manifold am vacuum ECO69 Fig 113 Antrbackfire valve Check valve A check valve is located the air pump discharge lines The valve prevents the backflow of exhaust gas Backflow of exhaust gas occurs In one of the following cases 1 When the pump dirve
25. adjusting screw TROUBLE DIAGNOSES AND CORRECTIONS Condition Rough engine idle or engine stop Probable cause Incorrect carburetor adjustment setting Incorrect basic ignition timing Incorrect automatic temperature control air cleaner Defect or malfunction of Adjust tion system spark plug high system tension cable breaker point ignition coil etc Engine idle too fast Car knock when coasting Trouble in throttle link and cable Incorrect throttle opener ad justment Trouble in control valve Trouble in automatic choke tension cable breaker point ignition coil etc Defect or malfunction of igni Adjust system spark plug high system Corrective action Adjust idle speed mixture and idle speed idle mixture choke timing Adjust automatic temperature control air cleaner or replace ignition Check throttle link and cable Adjust throttle opener Replace control valve Adjust automatic choke or replace ignition Incorrect throttle opener ad Justment Trouble in control valve Defect or malfunction of igni Adjust ton system spark plug high system tension cable breaker point 1gnition coil etc EC 22 Adjust throttle opener Replace contro valve or replace ignition SERVICE MANUAL EMISSION CONTROL SYSTEM w NISSAN MOTOR CO LTD TOKYO JAPAN SECTION L16 L16 ENGINE GENERAL DESCRIPTION EC 24 CR
26. and flow to crankcase side If the air does not flow the valve should be replaced Flow guide valve zero in short time 9 If the height does not drop to zero short when the filler is removed it 1s the cause of the clogged hose 145 Aq Manometer Note case the vent lime 15 clogged the breathing in fuel tank not thoroughly made thus causing insufficient delivery of fuel to engme or vapor lock It must therefore be repaired or replaced Vapor liquid separator Fuel filler cap 029 104 Checking of evaporative emission control system But when the air is blown from crankcase side rt should never flow to the other two vent lines 3 While the air 15 pressed into flow guide valve from carburetor air cleaner side t flows to the fuel tank side and or crankcase side 4 Thi valve opens when the inner pressure becomes 0 4 inch Hg In case of improper operations or breakage replace t From air cleaner From fuel tank To crankcase Fig 105 Flow guide valve TESTING IGNITION TIMING ADJUSTING IDLE SPEED AND MIXTURE Engine tune up must be done according to Nissan Specifications with the necessary equipment as recommended But the following pro cedures are recommended for Datsun 510 WPL510 and PL521 setting ignition timing and adjusting idle speed and mixture If these procedures are taken the emission will be con
27. at idle remove the ventilator hose from the crankcase ventilation control valve If the valve 15 working a hissing noise will be heard as air passes through the valve and a strong vacuum should be felt immediately when a finger 1s placed over the valve inlet If valve 15 plugged do not attempt to clean it Replace with a new valve Check for deposit plugging in the hose Clean if necessary and hose con 49 Fig 77 Testing of crankcase ventilation control valve EMISSION CONTROL SYSTEM EXHAUST EMISSION CONTROL SYSTEM Testing of spark advance control system Datsun PL510 WPL510 and PL521 1 Disconnect the lead wires from the terminal of the distributor and connect the ammeter between the lead wire for the retarded breaker point and ground 2 Set the ignition key in the position Do not start the engine 3 Make sure that the temperature sensing switch 15 and the room temperature 15 above 509 Then check that the ammeter indicates about 3 amperes when the throttle valve is partially opened and the shift lever 1s 1n 3rd gear When the throttle valve 15 wide open or nearly closed or the shift lever 1s 1n a gear postion other than 3rd gear the ammeter should 1ndicate zero Advanced side terminal Ignition Fig EC 78 Testing of spark advance control system Ecoso In case the ammeter indicates zero step 3 1 Check whether or not terminals are loose 2 If they
28. belt fails 2 When the spring of relief valve fails EC070 Fig EC 114 Check valve Air pump relief valve The pump relief valve 15 mounted the discharge cavity of the pump and accomplishes the fol lowing functions without affecting effectiveness of the exhaust emission control system 1 Minimizes exhaust gas tempera ture rise 2 Miumies horsepower losses re sulting from injection into the exhaust system 3 Protects the pump from excessive back pressure EC 57 REMOVAL DISASSEMBLY AND INSPECTION Primarily do not remove the exhaust emission control system When the removal 15 unavoidable however thoroughly inspect before removing Air pump Removal 1 Disconnect the hoses from the air pump housing cover 2 Remove the bolt secunng the air pump to the belt adjusting bar or adjusting bracket 3 Remove the bolt securing the air pump to the mounting bracket and remove the air pump drive belt 4 Dismount the air pump assembly from the vehicle Periodical service No periodic maintenance 15 re quired since the bearings 1n the pump are lubrication free types Every 3 000 miles however the belt tension should be inspected and adjusted Disassembly 1 Remove four pulley drive bolts and remove the pulley from the hub 2 Secure the air pump drive hub in a vise as shown Figure EC 115 and remove four end cover bolts Note Never clamp on the alummum housing Fig EC 115 Remo
29. engine during coasting The high manifold vacuum during coasting prevents the mixture from complete combustion because of re duced amount of mixture per cylinder per rotation of engine with a result that large amount of HC emissions 15 emitted into the atmosphere BCDD has been designed based on the idea of eliminating this objection It operates such way that when manifold vacuum exceeds a pre determined value t provides additional mixture of optimum ratio and quantity Into the manifold by opening the separate mixture passage in the carburetor Complete combustion of fuel 15 assisted this additional mixture and remarkably reduces the amount of HC contained exhaust gases EMISSION CONTROL SYSTEM 1 Dtaphragm I 2 Vacuum control valve 3 Diaphragm 4 Mixture control valve 5 Coasting aur bleed II 6 Coasting air bleed I 7 Coasting jet Float chamber ECO46 Performance The diaphragm 1 1 in Figure EC 72 detects the mamfold vacuum and when the vacuum exceeds a pre determined value acts so as to open the vacuum control valve 2 This opemng makes the manifold vacuum intorduce into the second vacuum chamber and actuates the Secondary main Jet diaphragm 3 When diaphragm II operates the mixture control valve 4 opens passage and introduces the additional mixture into the manifold The amount of the mixture 15 controlled by the servo action of the mixt
30. flow meter stops at the same posi tion for both F and R carburetors EC 150 Setting flow meter 9 Adjust the ignition timing to 5 BTDC With automatic transmission adjust 1t to TDC Fig EC 151 Adjusting ignition timing 10 When the ignition timing 15 ad justed and engine speed is changed repeat the adjustments descnbed above paragraph 7 ll Disconnect the control valve vacuum tube 9 from the control valve connector 4 and connect the servo diaphragm vacuum tube 5 to the control valve connector 4 Apply manifold boost to the servo diaphragm 6 And then confirm that the engine idling speed is nearly 1 200 to 1 400 rpm 12 Use a flow meter and adjust the balance screw 2 properly so that the front and rear carburetor intake air volume 15 balanced Fig EC 152 Balance screw 13 Adjust the opener adjusting screw 13 so that the engine speed is 1 400 rpm under the condition de scribed above 1n paragraph 12 Fig EC 153 Opener adjusting screw Note Before adjusting the engine speed once race the engme at 3 000 rpm And rame agam the engine speed to 1 700 rpm with opener adjusting screw then gradu ally decrease the engine speed to 1 400 rpm At the same time 1 15 important that CO level is strictly 1 0 to 1 6 06 to 12 for automatic transmis sion models by using CO meter dis connecting the air pump discharge hose If measured value 15 out of the specified level equally turn
31. leaks capacity of the valve is sufficient under these conditions to handle any blow by plus a small amount of ventilating air The ventilating air 15 then drawn from the clean side of the carburetor air cleaner through the tube connection into the crankcase Under full throttle conditions the manifold vacuum 1s insufficient to 2 Disconnect all hoses and blow them out with compressed air If any hose cannot be ree of obstructions replace with new one 3 Check the function of the crank case ventilation control valve If the EC 25 draw the blow by flow through the valve and its flow goes through the sealed system the reverse direction In cars with an excessively high blow by some of the flow will go through the tube connection to the carburetor air cleaner under all con ditions 1 Crankcase ventila tion control valve 2 Flame arrester 3 Sealed filler cap 4 Baffle plate 5 Oil level gauge 6 Ring 7 separator 8 Baffle plate Fig EC 51 Crankcase emission control system closed type valve 1s found defective replace it with a new assembly The control valve assembly should be replaced with a new one every 24 000 miles EMISSION CONTROL SYSTEM EXHAUST EMISSION CONTROL SYSTEM DESCRIPTION CAMSHAFT MODIFICATION SPARK TIMING CONTROL SYSTEM DUAL POINT DISTRIBUTOR PL510 WPL 510 and PL521 with manual transmission PL510 and WPL510 with automatic transmission Accelerator switch
32. manifold and carbu retor air cleaner The ventilation control valve is pro vided to conduct crankcase blow by gas to the intake manifold During partial throttle engine the intake manifold sucks the blow by gas through the valve Nor operaton of the mally the capacity of the valve is sufficient to handle any blow by and a small amount of ventilating The ventilating air 1 then drawn from the clean side of the carburetor air cleaner through the tube connecting carbu retor air cleaner to rocker cover into the crankcase Under fuli throttle condition the Fresh air Blow by gas used in filtering oil manifold vacuum 15 insufficient to draw the blow by flow through valve and its flow goes through the tube connection in the reverse direc In vehicles with excessively high blow by some of the flow will go through tube connection to the carburetor air cleaner under all opera ting conditions Fig EC 3 Crankcase emission control system at partially throttle open EC 3 M EMISSION CONTROL SYSTEM lt Fresh air Blow by gas Air used in filtering oil ECOO2 Fig EC 4 Crankcase emission control system at full throttle open EXHAUST EMISSION CONTROL SYSTEM DESCRIPTION TRANSMISSION CONTROLLED VACUUM ADVANCE Operation AUTOMATIC TEMPERATURE CONTROL AIR CLEANER ELECTRIC AUTOMATIC CHOKE DESCRIPTION The 1972 model A12 engin
33. manual transmission SCHEMATIC DRAWING OF CONTROL SYSTEM FOR L16 ENGINE WITH MANUAL TRANSMISSION MODEL PL521 Ignition key To distributor T Ignition coil Battery Distributor Temp sensing switch Advanced breaker point Retarded breaker point 1 Third gear switch 421 Transmission Relay Accel switch Carburetor t Accel pedal IR Throttle switch EC 52 B Schematic drawing of control system for 1 16 engine with manual transmission EC 27 EMISSION CONTROL SYSTEM 15 installed instead of the throttle switch on PLS10 Note On PL521 the combination of Table 1 shows the operation of each the throttle switch car control switch under a normal buretor and the accelerator switch operating condition of the vehicle UOISSTUISUEI L W o2oe Aq p ogld r oq PINOYS 101298 sn 1554 UNSIE Jo 9522 UJ yy St Yous et uonisod SI 19A9 puy uorsstu St oras 19M0 4 st ut sr IYS Udy 330 SI uols 10514 10 seo1dop pue OISTdM 01574 101 s 18 p 0 uey pouodo st IMO ay St Yours ay pouado Apus 51 AJLA AAO ST sty
34. question Corrective action Replace with new pump Adjust drive belt tension to specified value N Replace Replace EMISSION CONTROL SYSTEM Probable cause Leakage from hoses connectors or clamps Condition Corrective action Repair or tighten Replace tf necessary Air leakage Leakage from relief valve Replace relief valve Stick of air pump Replace with new assembly Slackness of drive belt accelerating Abnormal noise Adjust drive belt tension Leakage from hoses connectors or Retighten or replace clamps EC 76 SERVICE MANUAL EMISSION CONTROL SYSTEM lt NISSAN MOTOR LTD TOKYO JAPAN SECTION SE SERVICE EQUIPMENT 4 RECOMMENDED PERIODICAL MAINTENANCE SERVICE DATA SERVICE TOOL EC 18 EC 19 2 24 EMISSION CONTROL SYSTEM RECOMMENDED PERIODICAL MAINTENANCE f Item Interval miles of Engine Check and adjust ignition tuming every 3 000 x Engine tune up 12 000 Check spark plugs 3 000 i Replace spark plugs 12 000 Check high tension cables 12 000 Check distributor breaker points 3 000 Replace distributor breaker points 12 000 Grease distributor cam and cam heel 6 000 Replace carburetor air cleaner element 24 000 2 Crankcase Emission Control Check hoses and piping connections for looseness and clog 12 000 Check ventilation contro valve for operation 12 000 Repla
35. recommended conditions replace it Testing of anti backfire valve Operate the engine it reaches normal operating temperature 2 Inspect all hoses and hose connec tions for obvious leaks and correct if EC 67 necessary before checking the anti backfire valve operation 3 Disconnect the hose from intake manifold at the valve Insert a suitable plug in the hose and fasten it securely 4 Open and close the throttle valve rapidly if flow is felt for one to two seconds by a finger at anti back fire valve outlet to the intake manr fold the valve 1s functioning properly If ar flow 15 not felt or air flow 15 felt continuously more than two seconds the valve should be replaced 5 Connect the air hose to intake manifold and disconnect the air inlet hose from the pump at the anti backfire valve If engine idle speed changes excessively the valve function Is not correct and it should be re placed Note In case of idle racmg anti backfire valve cannot be considered abnormal even if there exists after burning since it never comes out while running Testing of air pump 1 Operate the enigne until it reaches normal operating temperature 2 Inspect all hose hose connec tions air gallery for leaks and correct necessary before checking the ar injection pump 3 Check the air injection pump belt tension and adjust to specifications if necessary 4 Disconnect supply hose a
36. that those who use this manual are responsible for revising the contents according to the SERVICE JOURNAL and SERVICE DATA AND SPECIFI CATIONS issued by the factory which carry the latest factory approved servicing methods Rights alteration of specifications and methods at any time are reserved NISSAN MOTOR CO LTD TOKYO JAPAN 1971 NISSAN MOTOR CO LTD Printed in Japan SERVICE MANUAL _ EMISSION CONTROL SYSTEM NISSAN MOTOR TOKYO JAPAN SECTION A12 A12 ENGINE GENERAL DESCRIPTION CRANKCASE EMISSION CONTROL SYSTEM EXHAUST EMISSION CONTROL SYSTEM EVAPORATIVE EMISSION CONTROL SYSTEM MAINTENANCE AND TESTING ADJUSTING IGNITION TIMING ENGINE IDLING SPEED AND GAS MIXTURE TROUBLE DIAGNOSES AND CORRECTIONS EC 11 EC 12 EC 21 EC 22 EMISSION CONTROL SYSTEM A12 ENGINE Fig EC 1 Front aide external view Fig EC 2 Rear side external view 2 EMISSION CONTROL SYSTEM There are three types of control system These are 1 Crankcase control system 2 Exhaust emission control system emission 3 Evaporative emission control system Periodic inspection and required servicing of these systems should be carried out at the recommended GENERAL DESCRIPTION intervals to reduce harmful emissions to a minimum CRANKCASE EMISSION CONTROL SYSTEM DESCRIPTION This system returns blow by gas to both the intake
37. the escaping into the carburetor crankcase Once the engine starts the cleaner gas evaporating in the crankcase 1s Flow guide valve operates and blow by gas and gasoline vapor flow as follows When the engine 1s not running the vapor vent line vapor liquid separator and fuel tank are filled with gasoline vapor produced in the sealed type fuel tank A flow guide valve opens when the gas pressure 15 above 04 inch Hg The gas passed through the flow guide 1 From Vapor vent line Flow guide valve The valve opens when the pressure ts over 0 4 inch Hg Positive sealing sucked into the manifold for com bustion When the pressure of the sealed type fuel tank vapor liquid separator and vapor vent becomes negative by decreasing the fuel the flow guide valve 1 opens to send fresh air from the carburetor cleaner to the fuel tank filler cap ECO13 Fig EC 17 Evaporative emission control system 11 EMISSION CONTROL SYSTEM FLOW GUIDE VALVE This valve is mounted in the engine compartment Marks A F and C are engraved in the body of the valve to indicate the connection of the vapor vent line Q a 7 FROM ss FROM 2 FUEL TANK AIR CLEANER EC 18 Flow gude valve MAINTENANCE AND TESTING GENERAL MAINTENANCE Carburetor Distributor Spark plug High tension cable Battery Carbure
38. the shoes compensate for shoe wear and vane operating sound The rotor 1s further sealed by flexible carbon seals which are attached to each end The plates also seal off the housing and end cover to confine the air to the pump cavities The rotor 15 a steel ring and bolted to the rotor end This ring prevents the rotor from spreading at high speed and also positions and holds the rear bearing and the carbon seal The front and rear bearings which support the rotor are of two types The front bearing uses ball bearings and the rear bearing uses needle bearings The vane uses needle bear ings All bearings have been greased EMISSION CONTROL SYSTEM Air injection into each exhaust port Fresh air from the pump 15 injected into the individual exhaust ports of the cylinder head located near 1 Housing 2 Vane 3 Relief valve 4 Stripper the exhaust valve Pressurized through hoses and distribution 5 End cover 6 Needle beanng 7 Vane shaft 8 Rotor rng 7 lt x Ver quem 2 F 067 9 Needle beanng 10 Side seal 11 Ball bearing 12 Pulley hub Fig EC 111 Sectional view of air pump three valve type manifold schematic of the exhaust port 15 shown Figure EC 112 15 transmitted Exhaust manifold Aur injection nozzle 068 112 Aw injection into exhaust port EC 56 EMISSION CONTROL SYSTEM In
39. the state of cold air passage under various con ditions of inlet temperature and loads Open Intake mvt vacuum 100 F 118 F Inlet air temperature 44 Fig EC 68 State of cold air passage PL510 and WPL510 models idle compensator 1s provided in this air cleaner This device 15 independent of the atr cleaner The PL521 model for tropical area use 15 provided with the idle com pensator as service EMISSION CONTROL SYSTEM LEAN CARBURETION Through the adoption of automatic temperature control air cleaner the setting of carburetor at leaner mixture ratio has become possible without sacrificing engine performance with a resultant reduction 1n the amount of pollutants exhaust gases Further more a power valve an ennchment device has newly been equipped to provide sufficient engine output at wide open running Secondary Primary EC045 Fig EC 69 Pouer ualue system ELECTRIC AUTOMATIC CHOKE An electric heater warms a bi metal Interconnected to the choke valve and controls the position of choke valve and throttle valve in accordance with the elapse of time or the warm up condition of engine The construction and function of each part of this carburetor are as follows See Fig 70 1 Secondary diaphragm 4 Throttle adjusting chamber Screw 2 Brmetal assembly 5 Slow adjusting 3 Fast cam Screw EC 70 Construction of electri
40. timing light 6 Adjust engine idling speed to 600 to 700 rpm turning F and R throttle adjusting screws Notes a When the engine idling speed 15 being adjusted do not touch fast idle setting screw because this screw has already been adjusted at the factory EMISSION CONTROL SYSTEM The engine speed becomes unstable during idling speed unbalancing the operation between F and R carbu retors 1 adjusted by the fast idle setting screw Fast 1dle setting screw di Fig EC 145 Fast idle setting screw b Reduce engine idling speed to the extent that engine operates stably c When throttle adjusting screws is turned clockwise throttle valve opens EC080 Fig EC 147 Throttle adjusting screw L24 engine standard idling speed With manual transmission 750 rpm at 5 BTDC Without automatic transmission 600 rpm at TDC 7 Apply a flow meter to the front side air horn 01 the air cleaner turn the air flow adjusting screw align the upper end of the float 1n the glass tube to the scale Fig EC 148 Setting flow meter 6 Play corresponding to clearance Effective motion range SU carburetor Rear side Throttle shaft Notes Stand the flow meter float verti cally b The flow meter 15 used to hinder the engine from mtaking and therefore t 1s recommended that the flow meter be used for a very short period of time one to t
41. 412 84 from Oct off line lt 0 22 Advance 0 05 Retard lt 4 L46PW HITACHI lt FGA 1 lt 0 394 Third gear 3 to 40 ON under 3 or above 40 OFF Above 50 F ON under 34 F OFF TBTDC 700 z 2 490 to 55 0 0197 in of point gap 00315 to 0 0354 EMISSION CONTROL SYSTEM Item HLS30 U HLS30 AU Engine model L24 lt Number of cylinders 6 1n Type of cylinder head Displacement x bore x stroke cu n x in x in 146 x 3 268 x 2 902 Nomunal compression ratio 88tol Recommended fuel grade Transmission type 3N71B ia Curb weight 16 2 300 2 360 of crankcase emission control Closed type of exhaust emission control Carburetor HITACHI lt Model HJG 46W 8 HJG 46W 9 Suction piston lift In dia Metering needle N 58 Suction spring i 23 lt hole from front carburetor Fast idle throttle opening at full choke 69 79 EC 87 EMISSION CONTROL SYSTEM Item Alternator Make Model Capacity Distributor Make Model Condenser AF Spark plug Make Model pump Make Model Capacity cu Pulley ratio Antrbackfire valve Make Type Model Duration time Check valve Make Model Opening pressure in Hg Flow guide valve Make Model Opening pressure 1n Hg HLS30 U HITACHI
42. ANKCASE EMISSION E25 CONTROL SYSTEM EXHAUST EMISSION CONTROL SYSTEM Hn EVAPORATIVE EMISSION CONTROL SYSTEM TROUBLE DIAGNOSES AND 0 39 CORRECTIONS MAINTENANCE AND TESTING EC 39 TESTING IGNITION TIMING ADJUSTING IDLE SPEED EC 49 AND MIXTURE EMISSION CONTROL SYSTEM Q GENERAL DESCRIPTION of these systems should be There are three types of emission 2 Exhaust emission control system that must be controlled These are Engine modifications 1 Crankcase system emission control 3 Evaporative emission control system Closed system Periodic inspection and required 24 Fig 49 Left hand side external view Fig EC 50 Rear external view carried out at the recommended intervals to assure a cleaner better performance longer lasting engine and the most complete elimination of air pollution EMISSION CONTROL SYSTEM CRANKCASE EMISSION CONTROL SYSTEM CLOSED SYSTEM This system provides for the re turn of blow by gases to both intake manifold and carburetor cleaner A variable orifice valve is provided to conduct crankcase blow by gases to the intake manifold During throttle operation of the engine the intake manifold sucks the blow by gases through the valve Normally the 1 PERIODIC SERVICE Once a year or every 12 000 miles the Crankcase Emission Control Sys tem should be serviced as follows 1 Check hoses and hose connectors for
43. B El Lw ELE wu LI a im Pr deeper 1 8 T 1 i BRM E De p l GL S c RE E pep E ew j umm E ao ph TT E Res BH RENE T G gt nce HE MEL um m EE CHEER WR p Eco 3 D 8 HL ee ee BR ES HELF gee p amas IGNITION SW E Ae HHHH up STOP LAMP SW WR FLASHER UNIT os H HH Ys HORN REGULATOR LEUTE temi KICK rcd DEFROSTER Sw IE E BR HAA 3 BERN z gm 3303 eB 5 8 Effective with Aug 1971 m gt JOP 7 7 64 X6 REAR WINDOW DEFROSTER Canada only SD BRAKE SPEED TEMP SW Ug Effective with Aug 1971 AUTO SYSTEM DETECTOR oo CO 5 TURN SIGNAL 5 Cy N SIDE MARKER LAMP L H OIL PRESS Sw i e 8 G BL 1 gt X ENG ROOM LAMP z RELAY CARBURETOR SW LY WASHER MOTOR NEN 5 99 _ 5 gt porr THERMAL M INHIBITOR Sw DEFROSTER RELAY Canada only Effective with Aug 1971 KICK DOWN SOLENOID MOVE INDICATOR Ra CAMP RELAY R
44. C 60 EC 57 Throttle opener EC 60 EC 57 Dual point distributor for EC 57 automatic transmission EC 61 Manifold heat control thermostat EC 62 EC 57 Hot air air cleaner EC 63 EC 57 Temperature control of SU type EC 60 carburetor by engine coolant EC 63 EC 60 EC 54 EMISSION CONTROL SYSTEM AIR INJECTION SYSTEM The injection pump receives clean air through a hose connected to a fitting attached beneath the carbu retor air cleaner This rotary vane type pump has been designed to draw and compress t to produce maximum air flow with quiet operation fresh air from the air injection pump 15 routed to a check valve which prevents exhaust gas from entering the ar pump in the event exhaust manifold pressure 15 greater than air injection pressure or in the case of an inoperative pump The compressed fresh is injected through injection nozzle to the exhaust ports An antr backfire valve has been used to eliminate popping in the exhaust system when the throttle 1s closed at hgh speed coasting Controls which have been incorporat gt Fresh Burned exhaust gas 7 V lt 2 24 066 Fy EC 110 injection system ed to assure reliable system operation include an antrbackfire valve and a check valve Air pump The air pump 15 of a three vane type It is a positive displacement vane type which requires no lubricatin
45. EC 5 Schematic drawing of control system for A12 engine When electric current flows through EP d the solenoid valve the needle valve da opens and introduces from air r ays cleaner into the vacuum advance unit STA r 7 of the distributor through vacuum pes hose and the vacuum advance 15 elimi gee nated When the solenoid valve is deenergized the needle valve closes and the vacuum created by the carbu retor 5 introduced into the vacuum advance umt of the distributor to provide usual vacuum advance r 4 gear switch located transmission case operates so as to 4 Reverse gear switch Interrupt the flow of electric current when the gear is placed into but allows it to flow other gear positions EC 6 Gear switch installation 5 l EMISSION CONTROL SYSTEM SS EC 7 Temperature sensing installation The temperature sensing switch is screwed on the dash side panel RH The bi metal located 1n the tempera ture sensing switch prevents the flow of electric current when the tempera ture 15 below 50 F and thus ensures proper running performance 1m mediately after starting the engine cold weather An orifice 15 employed in the vacu um hose connecting the carburetor and tee to restrict flow by passing the carburetor whe
46. IALA 9nio1g ou UO AA uedo oprA 10 L V LIV 9g jo sisazajsAy yous Bursuas ay jo ST Yo ats pouado st OY uou puy a 430 St ay peso preou st 2130143 ay A4O St 0011304 011504 25012 uS3114S a a 01519 WALSAS 1 03 s1240 4 S so 5 31 8 59514 2 1225 Je suado pjouriq St Yours 911 406 SI o1njeJo dut 1 y puy 440 SI YMS st 1uoun1eduroo 198uossed jo e1nje1oduio ay 405 NO 0129 440 AS 5 5 3119520 21310143 9ptA UMA JO Sursini9 3133014 1 920 10 851119 211014 uedo 19AO 10 Sutsin1O 01235 JOY 11815 urguq 11 25 pjoo dn SuruueA pue 11845 8 NOILKINOO JO SNOILV3ddO ATAVL EC 30 EMISSION CONTROL SYSTEM qo rs switch and operated by the movement of depressed otherwise showing OFF 1 on y the accelerato
47. L STG LOCK SW PARKING D BRAKE SW lBUZZER BR CLOCK L C 1 Lane 5 REAR COMB LAMP LH COMBINED INSTRUMENT prigis DOOR SW L H 11 191919 HEATER SW P el RADIO GLOVE BOX HEATER UNIT LAMP 8 SW BR X OPTION PARTS COLOR CODE Black White Red Yellow Green Blue WIRING DIAGRAM MODEL PL521 XHAZARD SW FLASHER UNIT HORN STQP LAMP XHAZARD TANK UNIT GAUGE SIDE MARKER S FLASHER gt 00 LiGHT AUTO CHOKE RELAY UNIT ovo BACK UP SIDE MARKER LAMP RELAY RELAY D ID dz LAMP SW eus ots X Y a RL e T BA Egje a NGIN reine RO OM RL COMBINATION 14 p HH HEAD HOOD SW a ac RL RB 2 F 8 TURN jae H RE SIGNAL LAMP 2 6 LIGHTING SW RG LICENSE LAMP XRH 6 YB F SG OIL PRESSURE m E SW WIPER SW THERMAL VOLTAGE XDOOR SW TRANSMITTER ROOM LAMP T 1 ee 5 TH HEATER SW LH IGNITION SW P COMB8INATION LAMP 5 CIGARETTE LIGHTER Qo XLH p SIDE MARKER LAMP L H CLEARANCE X 8 TURN 6 HORN L Se SIGNAL LAMP COMBINATION METER H HORN H HEAD LAMP I TRANSMISSIO
48. L SYSTEM 1800x 135 1800x 115 5 10 15 20 25 Model 0412 81 From October 1971 production Model D412 84 Degree crank angle Degree crank angle Vacuum advance remains unchanged Degree crank angle 1 Condenser 2 Phase difference 7 crank degrees 8 10 12 14 16 18 20 22 4 3 Advanced breaker ECO39 4 Retarted breaker Vacuum Fig EC 63 Dual point distributor Fig EC 64 Distributor advance characteristics AUTOMATIC sensor and an air control valve which is vacuum at the valve is regulated TEMPER ATURE operated by intake mamfold vacuum by the temperature of the sensor CONTROL AIR CLEANER _ A T C AIR CLEANER Description The automatic temperature control cleaner always automatically keeps temperatures constant and thus makes leaner carburetor calibra ton possible consistent with good driveability This therefore reduces the exhaust emissions as compared with normal carburetor calibration It also prevents icing in cold weather m proving operating performance This system employs a special 41 cleaner equipped with a temperature EC 65 Automatic temperature control air cleaner 1 inlet pipe 2 Vacuum motor ass y 3 Temperature sensor ass y 4 Hot air pipe 5 Air control valve EC 34 EMISSION CONTROL SYSTEM When temperature 15 low with the engine running the valve so behaves as to clos
49. M GENERAL MAINTENANCE To make certam that exhaust emissions are maintained at low level t 15 recommended that n spection be basically made every 12 months or every 12 000 miles Best engine operation and minimum ex haust emissions will be obtained with regular 1nspections and recommended servicing at the specified interval Distributor Check the distributor breaker points for abnormal pitting and wear Replace f necessary Make sure that they are in correct alignment for full contact and that point dwell and gap are correct Clean distributor and apply grease to the cam and wick Breaker points should be replaced at intervals not exceeding 12 000 miles Fig EC 74 Cheching of distributor breaker point gap Spark plug Remove and clean plugs in a sand blast cleaner Inspect each spark plug Make certain that they are of the specified heat range Inspect insulator for crack and chips Check both center and ground electrodes If they are badly worn replace with new spark plugs File center electrode flat Set the gap to 00315 to 00355 inch by using the proper adjusting tool Spark plug should be replaced every 12 000 miles Gap 0 0315 to 0 0355 inch Fig EC 75 Checking of spark plug point gap Carburetor Check the choke setting and adjust to specifications as required Proper carburetor idle mixture adjustment 15 imperative for best exhaust emission control Refer to the instructions given under Sett
50. M UTO CHOKE RELAY OIL PRESS B Canada only Eum A STOP ide Block 95202 RB RB UP IBLE Y UNK R RL REAR COMB R HIT BR LAMP RH TT _ YG REAR DEFROSTER STG LOCK sw PARKING ree Canada only DEFROSTER e LL RELAY BUZZER Canada only BR 1 Att LICENSE RW LAMP D CARBURETOR BACK UP Sw R USA ONLY wR HL HEAD LAMP LW LH RB RESISTANCE Lw m RE BW emg 0 LIGHTER X cL B L GL ws LR COLOR CODE 198 0 te Black I GN Co b d gt PARK TURN White CAMP LH E CUR SPARK PLUGS j HEATER SW poor sw LH BR Y L X RADIO BR dois SIDE MARKER WASHER Blue LAMP LH MOTOR HEATER UNIT WIRING DIAGRAM B Y EARTH MODEL PL510AU HEAD LAMP SIDE MARKER INDICATOR RELAY RELAY HAZARD LAMP RH 1 HORN RELAY WIPER MOTOR FLASHER Lg 1 GR PARK TURN fal um LAMP eB h zo x gt o r gt zoo e T arto 2272 Joo io C cv GY Lip e Y HO JB a T LE f RB P LY R H LY HEAD CAMP puo d T H H ew
51. N SW 3rd SW THROTTLE o ANTENNA RADIO L ACC SW UR L coc Y AU edt i tW SIDE MARKER MOTOR gt gt gt TEMP SENS SW SAMP x COLOR CODE HEATER MOTOR LY UW MEANS OPTIONAL PARTS LgR Yellow RELAY EI Green Blue EC 100 WIRING DIAGRAM AUTO T M T M KD SW ACC RELAY SEN RHEOSTAT IF EQUIPED BATTERY W TANK SIDEML INSPECT HORN RELAY MODEL 530 JE RH g STEP L FUELPUMP GLOVE BOX RCOML UNIT RH SIDE M L 4 L OQL ob AI ar HT y w el E d 7 g 1 oe 6 66 po o ope EET Ti ILL pio R i RW puo LR pw ca Mes RW E 4 RB ee 811087 TI H FOGL SW 30 HEAD L RH T Hn ipt UR Oy Zr SM x Ji Si T ECU ry ER O m gt z r Bw LICENCE L LH E w FOGL LH FI gt 202020 w Y r 2 Cyr LAMP CIG LIGHTER HORN H e d Ep qu Ims LEAD WIRE Eis gs RL 4 WATER TEMP B ons Eg YR R YW B HEADL LH AUTO T M ow
52. NOSES AND EC M CORRECTIONS SAN MOTOR EMISSION CONTROL SYSTEM L24 ENGINE Fig EC 106 External view Fig EC 107 External view EC 52 EMISSION CONTROL SYSTEM GENERAL DESCRIPTION There are three types of emissions injection system A I S out at the recommended to be controlled The control systems Engine modification system intervals to reduce harmful exhaust are 3 Evaporative emission control 825 1255015 Sos Farro 1 Closed type crankcase emission system control system inspection and required 2 Exhaust emission control system servicing of these systems should be 064 gt Fresh Blow by gas 1 pump 5 Control valve 9 gallery pipe 2 Carburetor 6 diaphragm 10 Flow guide valve Mixed 3 AB valve 7 Emission control valve 11 Rubber tube evaporation ga 4 Check valve 8 Balance tube Fig EC 108 Emission control system on model S30 series EC 53 EMISSION CONTROL SYSTEM CRANKCASE EMISSION CONTROL SYSTEM DESCRIPTION This system returns blow by gas to both the intake manifold and carbu retor air cleaner A variable valve 1s used to feed crankcase blow by gas to the intake mamfold Dumnng partial throttle operation of the engine the intake manifold sucks the blow by gas through the valve Normally the capaci
53. ON SYSTEM Testing of check valve Testing of anti backfire valve Testing of air pump ENGINE MODIFICATIONS GENERAL MAINTENANCE To make sure that exhaust emis sions are maintained at a low level it 5 recommended that 1nspection be con ducted every 12 months or every 12 000 miles whichever occurs first Best engine operation and minimum exhaust emissions will be obtained through periodical inspections and from recommended servicing at these intervals Carburetor Check the choke setting and adjust to the specifications as required Proper carburetor idle mixture ad justment 1s imperative for best exhaust emission control Refer to the article given in Set ting ignition timing and adjusting idle speed and mixture Distributor Check the distributor breaker points for abnormal pitting and wear Replace if necessary Make sure they are in correct alignment for full con tact and that point dwell and gap are correct Clean and apply distributor grease to the cam and wick Breaker 7 points should be replaced at intervals not exceeding 12 000 miles CONTENTS EC 66 Functional inspection of throttle opener EC 66 at first 600 miles and every 12 000 mites EC 68 EC 66 Altitude adjusting of throttle opener EC 66 every 12 000 miles EC 68 EC 66 Testing of spark advance control system EC 69 EC 66 Inspection of manifold heat control EC 67 thermostat EC 69 Temperature control by engine coolant EC 70 EC 67 EVAPORA
54. On the SU type carburetor the flow rate of fuel varies with change the temperature of gasoline which Is largely affected by viscosity vari ations The carburetor is heated by engine coolant This design not only keeps a nearly constant flow rate regardless of ambient temperature variations but also contributes much to improved atomization into the air intake system A small sized thermostat was em ployed to control the flow of coolant to prevent deterioration under hot weather 072 Fig 128 Coolant passage EMISSION CONTROL SYSTEM SS GS ANNA N 22772 77 Le gt gt KAN LESSE be lt 1 NX Fig 128 b Coolant passage EVAPORATIVE EMISSION CONTROL SYSTEM DESCRIPTION DESCRIPTION This system is composed of the following four basic elements 1 Fuel tank with positive sealing filler cap 2 Vapor liquid separator 3 Vapor vent line 4 Flow guide valve CONTENTS EC 64 When the engine is at rest the vapor vent line vapor liquid separator and fuel tank are filled with evapo ration gas produced in the closed type fuel tank flow guide valve opens when the gas pressure exceeds 0 4 inch Hg The gas passed through the flow guide valve 2 15 stored into crankcase Once the engine starts operation ev
55. SERVICE MANUAL EMISSION CONTROL SYSTEM FOR 1972 YEAR MODELS REVISED EDITION Y NISSAN MOTOR CO LTD TOKYO U I EMISSION CONTROL SYSTEMS SERVICE MANUAL NISSAN MOTOR TOKYO JAPAN QUICK REFERENCE INDEX A12 ENGINE L16 ENGINE L24 ENGINE SERVICE EQUIPMENT FOREWORD This service manual has been prepared for the purpose of assisting the service personnel of our distributors and dealers in providing effective service and maintenance of all Datsun vehicle s Emission Control Systems Since proper maintenance and service are most essential to satisfy the Federal and California Pollution Control Standards by keeping vehicles m the best possible condition this manual should be carefully studied The following matters should be noted for effective utilization of this manual 1 Also refer to the following SERVICE MANUALS for complete details of the engines because this manual gives information concerning the Emission Control System only e 10 and A12 ENGINE e 113 1 16 and 120 ENGINE e L20A and L24 ENGINE All part names this manual conform to PARTS CATALOG of each vehicle and only the genuine service parts listed in this PARTS CATALOG must be used for replacement All information illustrations and specifications contained in this manual are based on the latest product information available at the time of publication approval It should be emphasized
56. TIVE EMISSION CONTROL EC 67 SYSTEM EC 70 EC 67 Checking of fuel tank vapor liquid EC 67 separator and vapor vent line EC 70 EC 67 Checking of flow guide valve EC 71 EC 68 Fig EC 131 Checking of distributor breaker point gap Spark plug Remove and clean plugs m a sand blast cleaner Inspect each spark plug Make sure that they are of the speci fied heat range Inspect insulator for cranks and chips Check both center and ground electrodes If they are excessively worn replace with new spark plugs File center electrode flat Set the gap to 00315 to 0 0355 inch by the use of a proper adjusting tool Spark plug should be replaced every 12 000 miles 1 1 Fig EC 132 Checking of spark plug point gap EC 66 High tension cable Use an ohmmeter to check resist ance on secondary cables Disconnect cables from spark plugs and remove distributor cap from distributor to gether with the secondary cables Do not remove cables from the cap Con nect the ohmmeter between the cable terminal on the spark plug side and the corresponding electrode inside the cap If the resistance 15 more than 30 000 ohms remove the cable from the cap and check the cable resistance only If the resistance 15 still more than 30 000 ohms replace the cable as sembly Fig EC 133 Cheching of high tension cables Battery Measure specific gravity of electro lyte with accurate hydrometer Specific gravity should be 1 220
57. The air injection pump 15 completely noiseless Under normal conditions noise rises in pitch as engine speed increases If excessive noise 1s heard 1 Make sure that the pump rotates correctly and check the belt for proper tension 2 Check hoses for tightness leaking or touching with other parts 3 Check the pump mounting bracket and the air cleaner for secure installation 4 Check relief valve for escaping air Noise internal cause Vane noise A chirping or squeaking noise 1s most commonly associated with vanes rubbing in housing bore Vane chirping 15 most noticeable at low speed and is heard intermittently Additional wear in time may eliminate this condition If additional wear in Condition Inoperative pump Insufficient delivering air Probable cause Trouble in pump Excessive slackness of drive belt Damaged vane hub bearing Worn vane Worn carbon shoe Worn side seal choke setting Incorrect basic timing Probable cause Incorrect carburetor adjustment of idle speed idle muxture Disconnection of vacuum tube of the anti backfire valve Seized or failing air pump time does not eliminate chirp the pump must be disassembled and the vane and carbon shoes should be replaced 2 noise rolling sound indicates bearing noise This sound will be noticeable at all speeds but does not necessarily indicate bearing failure However if noise i
58. a slight preload to compensate the variation of the atmospheric pres Sure Degree crank angle Degree crank angle EMISSION CONTROL SYSTEM Carburetor Valve Diaphragm Altitude corrector Vacuum adjusting screw Filter Manifold vacuum tube Adjusting screw Primary throttle valve tA Q tS ECO11 Fig 15 Throttle opener control system DISTRIBUTOR ADVANCE CHARACTERISTICS 20 2100 x 135 25 20 ane M T A T LA 2150 135 LZ 2100 115 5 10 15 20 25 Distributor rpm x102 Degree crank angle Degree crank angle EC 10 lt Former models D412 80 D412 63 0 4 6 810 12 14 16 18 20 Vacuum inHg New models From December 1971 production Model No unchanged 4 6 8 10 12 14 16 18 20 Vacuum 012 Fig EC 16 Distributor advance characteristics EMISSION CONTROL SYSTEM EVAPORATIVE EMISSION CONTROL SYSTEM DESCRIPTION DESCRIPTION This system consists of four basic elements indicated below 1 Fuel tank with positive sealing filler 2 Vapor liquid separator 3 Vapor vent line 4 Flow guide valve The flow guide valve prevents blow by gas from flowing into the fuel tank and guides fresh ar into it Flame arrester Crankcase ventilation valve CONTENTS EC 11 FLOW GUIDE VALVE EC 12 preventing gasoline vapor valve 2 is accumulated in
59. ank case side should never flow to the other two vent lines 3 While the air 15 pressed into the flow guide valve from the carburetor cleaner side it flows to the fuel tank side and or crankcase side 4 Thi valve opens when the inner pressure s 04 inch Hg In case of improper operations or breakage re place it From carburetor air cleaner From fuel tank To crankcase Fig EC 46 Flow guide valve ADJUSTING IGNITION TIMING ENGINE IDLING SPEED AND GAS MIXTURE ADJUSTING IGNITION TIMING ADJUSTING IDLING SPEED AND GAS MIXTURE ADJUSTING IGNITION TIMING Check the spark plugs and distri butor breaker points for condition 2 Thoroughly wipe off dirt and dust from the timing mark on the crank pulley Figure EC 47 CONTENTS EC 21 Adjusting only with tachometer EC 22 Adjusting with CO meter and tachometer EC 22 EC 22 3 Warm up the engine sufficiently 4 Install a timing light on the 1 cylinder spark plug wire and install a tachometer 5 Loosen the set screw to such extent that the distributor can be moved by hand 6 Set the idling speed to approxi EC 21 mately 700 rpm 7 Adjust the ignition timing to 59 BTDC Before Top Dead Center by the use of timing light 8 Lock the distributor set screw and make sure that the timing correct EMISSION CONTROL SYSTEM Fig EC 47 Timing marks on crank pulley ADJUSTING IDLING SPEED AND GAS MIXTURE Adjusting only w
60. ans Between these two timings there 15 a phase difference of 7 crank degrees 10 degrees for 1971 model vehicles The Retarded timing is intended for the operating condition as requir EC 26 ed when driving in urban district and serves to prevent air pollution while the Advanced timing 1s provided to meet the requirement when driving in the suburbs PL510 WPL510 and PL521 with manual transmission This system comprises tem perature sensing switch throttle switch a third gear switch a relay and a dual point distributor and the Retarded s used when the following conditions are satisfied when driving See Fig 52 1 The temperature inside the pas senger compartment 1s above 50 F 2 The throttle valve 1s opened at an angle of from 3 to 30 deg for PL510 and WPL510 and 3 to 40 deg for PL521 3 shift lever 15 placed at 3rd gear position EMISSION CONTROL SYSTEM SCHEMATIC DRAWING OF CONTROL SYSTEM FOR L16 ENGINE WITH MANUAL TRANSMISSION MODELS PL510 and WPL510 Ignition key To distributor Ignition coil Battery Distributor Advanced breaker point Retarded breaker point Temp sensing switch Transmission Carburetor Accel pedal Throttle switch Switch detecting wide open throttle position T in detecting close throttle position Fig EC 52 A Schematic drawing of control system for L16 engine with
61. aporation gas in crank EC 64 FLOW GUIDE VALVE EC 65 case manifold and carburetor cleaner are sucked into the manifold for combustion When the pressure of the closed type fuel tank vapor liquid separator and vapor vent line becomes negative by decreasing the fuel the flow guide valve 1 opens to send fresh air from the carburetor cleaner to the fuel tank EMISSION CONTROL SYSTEM Carburetor Flow guide valve Fuel vapor Overflow tube Vapor liquid separator Fuel vapor sx Vapor vent line Evaporation control tube Positive sealing filler cap To rocker cover To flow guide valve 1 From carburetor cleaner 2 To crankcase Carburetor cleaner Float chamber EC075 Fig EC 129 Evaporatwe emission control system FLOW GUIDE VALVE This valve operates to prevent reverse flow of blow by gas from the crankcase This valve is mounted pee CS inside the engine compartment The FROM 7 Che AIR CLEANER letters F and C engraved in SUEL TANK the body of the valve indicate the connection of vapor vent line TO CRANKCASE mense n ue mei d Fig EC 130 Flow guide valve EC 65 EMISSION CONTROL SYSTEM MAINTENANCE AND TESTING GENERAL MAINTENANCE Carburetor Distributor Spark plug High tension cable Battery Air cleaner element CRANKCASE EMISSION CONTROL SYSTEM AIR INJECTI
62. are in correct conditions disconnect terminals of relay Datsun PL521 and measure the voltage between terminal with No 1 punch mark and ground See Figure EC 79 relay Relay relay E i Voltmeter Ground 051 Fig 79 of voltage 3 case the voltage 15 approx 12V relay is defective and must be replaced with a new one 4 Incase the voltage 1s zero put the relay terminal to the original place 5 Check if the lead wire of each switch 1s rightly connected to harness 6 If nothing is found wrong check the continuity of each switch 7 result of 6 the condition of 4 15 found the discon nection of harness 15 considered Check the continuty of the switch taking harness off the switch In case ammeter shows approx 1 case the electric current is cut when the shift lever is positioned at gear place other than 3rd position and 3rd gear switch is normal If how ever electric current is not cut check 3rd gear switch 2 In case the electric current is cut when a the carburetor throttle valve 18 widely open or b nearly closed the throttle switch of Datsun PL510 and WPLSIO 15 normal case however the electric current is not cut 1t is abnormal n case of Datsun PLS21 both throttle switch accelerator switch are normal In case 15 normal and b 15 abnormal 1 In case of Datsun PL510 and Advanced side terminal
63. ash pot adjustment Bimetal setting 1 Measurement of bi metal heater resistance Install the bi metal cover in place on the carburetor Make sure that the resistance across the terminal and the carburetor body is in the range of 9 8 to 102 ohms Measure the resistance without the flow of electric current through heater and at about 70 F EC 46 Note Make sure that the throttle valve opens when the carburetor 15 mounted on the car If the throttle valve fails to open the unloader becomes inoperative resulting in poor acceleration after the engine 1s started Choke valve 057 Fig EC 96 Choke unloader adjustment Note Use an accurate measuring instrument such as a wheatstone bridge 2 Bimetal cover setting Position bimetal cover until the index mark 1s aligned at the middle point of the scale Note When somewhat over choked set bi metal cover after turning it clockwise by about one division of the scale graduations Fig EC 98 cover setting EMISSION CONTROL SYSTEM BOOST CONTROLLED DECELERATION DEVICE Adjustment of operating pressure of B C D D Prepare the following tools tachometer to measure the engine speed while idling and Screwdriver 2 A vacuum gauge and connecting Notes a type boost gauge such as Bourdon s tube type s recommended mercury type manometer should be avoided b Special tools are not required
64. ation This engine modification system has been designed so that HC emission ts reduced when engine brake 15 applied The control vaive self contains an altitude compensating device so that the control valve also operates cor rectly at a high land where the air 15 rare and characteristics of this control valve allow the control valve changing its operating negative pres Sure in approximate proportion to the atmospheric pressure Refer to Figure EC 122 EMISSION CONTROL SYSTEM Dual point distributor for automatic transmission The automatic transmission vehicle produces more exhaust gas in volume than the manual transmission vehicle does For this reason the former vehicle 15 compelled to provide a means of decreasing the concentra tion of exhaust pollutants It follows from the above consideration that the automatic transmission vehicle should have more retarded spark timing than the manual transmission vehicle should It should also have normal advanced spark timing to assure dnveability at low ambient tem peratures To satisfy these two requirements the 1971 and later model L24 engines employ a dual point distri butor similar design and con struction to that introduced in the L16 engine The dual point distributor provides two spark timings advanced and retarded The system consists of a 2 point distributor a relay and a temperature sensing switch Dif ference in these two timings 15 10
65. bove any of the following defects may be the cause Poor connection or broken har ness and fuse 2 Ar leakage resulting from poor connection of vacuum tube 3 Incorrect operation switch 4 Defective operation of solenoid valve of gear 5 Incorrect operation of temper ature sensing switch Automatic temperature control air cleaner Removal of sensor 1 Flatten the tabs of with pliers 2 Pull off the hoses Note Note the respective positions of the hoses from which they were removed 3 Pry the tab of clip with screw driver 4 Take off the sensor and clip EC 16 _ Pipe Catch Fixed with adhesive Hose Tab Gasket Fig EC 32 Removal of sensor w ON t hb Installation of sensor Install the sensor and gasket as sembly in the proper positions Fig EC 33 Installing sensor 2 Insert Be sure to hold the sensor at the portion in Figure EC 33 to avoid damage Press fit the clips into the pipe while straightening the tabs Note Use care not to damage the sensor Fig EC 34 Inserting clip 3 Connect the hoses to their proper positions Fig EC 35 Connecting hoses EMISSION CONTROL SYSTEM Inspection Among the possible troubles of this device most lable is the permanent opening of valve This trouble 15 not noticed warm weather but in cold weather appears as poor performance of engine such as tardy acceleration hesitation or eng
66. bove 13 with automatic distributor and Retarded mph transmission timing 1s used when the following 3 The throttle valve 1s opened at an conditions are fulfilled during drive angle of from 3 to 35 deg See Fig 53 Table 2 shows the operation of each This system consists of tem 1 The temperature inside pas control switch under normal perature sensing switch speed senger compartment is above 509 operating condition of the vehicle SCHEMATIC DRAWING OF CONTROL SYSTEM FOR L16 ENGINE WITH AUTOMATIC TRANSMISSION Ignition key Ignition coil Battery 7 Transmission Distributor Advanced breaker point Retarded breaker point Speedometer Speed detector Carburetor Switch for detecting wide open throttle position Switch for detecting close throttle position Fig EC 53 Schematic drawing of control system for L16 engine with automatic transmission EC 29 EMISSION CONTROL SYSTEM 00158138001 ST ayy ydw gI 1940 SI 5 puy ST yous oq Japun st poods ay uou 94 UPD uoissturo I9MO papraoid st Sururm x1eds ot uou NO ydw et o 29 440 NO 4605 40 AS 5 sivas 46 s 18 p uodo st
67. c automatic choke 1 BCDD control portion 2 Secondary diaphragm chamber 3 Fast cam Fig EC 71 Construction of electric automatic choke Brmetal and heater Electric current flows through the heater as the engine starts and warms bi metal The deflection of bi metal 15 transmitted to the choke valve through the choke valve lever 2 Fastidle cam The fast idle cam determines the opening of throttle valve so as to obtain proper amount of mixture corresponding to the opening of the choke valve which turn depends upon the warmed up condition of the engine 3 Fast idle adjusting screw This screw adjusts the opening of the throttle valve of fast idle cam EC 36 4 Unloader When accelerating the engine during the warm up period that is before choke valve opens sufficiently this unloader makes the choke valve open to a certain extent so as to obtain an adequate air fuel mixture 5 Vacuum diaphragm The moment when engine 1s ready just after the engine has started by cranking this diaphragm forces open choke valve to the predetermined extent so as to provide proper air fuel ratio 6 Brmetal case index mark brmetal case index mark 15 used for setting the moment of the bi metal which controls the air fuel mixture ratio required for starting BOOST CONTROLLED DECELERATION DEVICE B C D D Description The boost controlled deceleration device BC DD serves to reduce HC emissions emitted from
68. ce ventilation control valve 24 000 3 Exhaust Emission Control Check throttle opener setting throttle valve opening position first 600 and vacuum every 12 000 Check transmission controlled vacuum advance 12 000 Check automatic temperature control air cleaner 12 000 Check electrical switches of emission control system for 12 000 operation Check boost control deceleration device for operation B C D D first 600 every 3 000 Adjust boost control deceleration device for operation B C D D 12 000 Check spark timing control system for operation 12 000 Check air pump drive belt for tension and wear 240Z only 12 000 Check air pump for operation 240Z only 12 000 4 Evaporative Emission Control Check hoses hose connectors and pipings for leaks 12 000 Check flow guide valve for proper function 12 000 EC 78 EMISSION CONTROL SYSTEM SERVICE DATA of crankcase emission control Closed type Type of exhaust emission control Engine modification system Carburetor Make Model Type HITACHI DCH306 1A DCH306 1 Downdraft dual throat 1 DCH306 3A DCH306 3 t t Engine model A12 lt 4 Number of cylinders 4 1n line lt Displacement x x stroke cu 1n x 1n x 1n Nomunal compression ratio Recommended fuel grade lt _ Transmission type T woniow Final gear ratio Curb weight lb 1 660 1 680 Closed t
69. ct and that the engine speed settles down at the rated idling speed Removal When replacing the control valve and servo diaphragm the following instructions apply h EMISSION CONTROL SYSTEM Control valve 1 Daisconnect the vacuum tube from the control valve 2 Remove two set screws 1 Installation bolt 3 Vacuum tube 2 Control valve Fig EC 29 Removing control valve Servo Diaphragm 1 Disconnect the vacuum tube from the servo diaphragm 2 Remove the servo diaphragm to gether with the carburetor 3 Withdraw the cotter pin and re move the link 4 Loosen the lock nut and remove servo diaphragm from the carburetor ECO17 1 Servo diaphragm 4 Bracket 2 Lock nut 5 Stopper 3 Link 6 Carburetor Fig EC 30 Servo diaphragm Transmission controlled vacuum advance Inspection Disengage the clutch and race the engine at normal ambient temperature if ambient temperatures are low warm up the engine and pull off the vacuum hose from the distributor And by checking the hose with fingers 1f vacuum 15 felt at the top gear position and is not felt at other positions 1t 15 satisfactory 1 correct if vacuum is always felt at low temperatures below 50 F before the engine 15 warmed up Note Lock the front and rear wheels by fully pulling the parking brake lever before conducting this test Fig EC 31 Checking for operating of vacuum advance system If any malfunction 15 found by the check mentioned a
70. d and it should indicate zero when the pedal 1s depressed 4 does not work properly keep the pedal pressed and push the switch knob several tumes and conduct the same measurement as indicated step 3 5 If in the step 4 the switch 15 found to be functioning well release the accelerator switch adjusting nut and screw the switch assembly towards the pedal Leave the pedal alone at this point Even when the ohmmeter indicate zero screw the switch for 1 or 2 turns more and lock it by the adjusting nut 6 Ifthe switch itself 15 not working well replace 1t with a new one Testing of transmission Switch 1 Make sure of the insulation between the lead wire terminal of the transmission switch switch body 2 Disconnect the lead wires at the switch and connect the ohmmeter to the terminals 3 The ohmmeter should indicate zero when the shift lever is in the 3rd gear position And it should indicate infinity 99 at other gear position including the neutral position 4 does not work properly in step 3 replace the switch with a new one Testing of throttle Switch Datsun PL51 and WP L510 1 Detach cover from tle switch 2 Make sure that there is a func tional sound the switch when the accelerator pedal 15 depressed 3 Make sure of the insulation between the lead wire terminals and the base plate of the switch 4 Inspect the clearance between the cam body and the micro switch b
71. dance with the descrip tion given under paragraphs 1 2 and 3 above When several minutes have passed and the valve 1s partially opened read the thermister cation It 15 correct if the reading falls between 86 F and 126 F If the thermister reads widely apart from this range replace the sensor 7 With the engine which 15 equipped with an idle compensator do as follows before replacing sensor Clog the hose of idle compensator side by bending or clamping it and check the temperature following the procedure as given in paragraphs 5 and 6 above If the thermister reads correct temperature replace the idle compensator if it reads widely dif ferent replace the sensor ELECTRIC AUTOMATIC CHOKE Adjustment Fast idle adjustment Place fast idle arm on first step of fast idle cam Then adjust fast idle adjusting screw in such a way that the clearance of throttle valve shown at A in the illustration will be 0047 inch for manual transmission car and 0055 inch for automatic transmission car EMISSION CONTROL SYSTEM Notes If engme speed does not rise inch wider than the specified ing adjust until the clearance sufficiently and 15 unstable after value becomes narrower by 0 008 inch starting adjust the clearance until b If engine over speeds after start than the specified value there exists clearance of 0 008 Throttle valve 055 Fig EC 94 Fast idle adjustment Vacuum br
72. degrees of crankshaft rotation The advanced timing 15 used to give earlier timing in the cycle for 1222220222 2 optimum engine performance low temperature The retarded position 13 used the usual application and helps reduce the emission of harmful Ignition Timing 1 Vacuum adjusting screw 2 Vacuum control valve 3 Altitude corrector 4 Servo diaphragm 5 Carburetor throttle plate 6 Opener adjusting screw ECO71 Fig EC 122 Engine modification system pollutants to a minimum follow ing table shows outside temperatures and the application of the two spark timings To distributor Temperature sensing switch Ignition coil Distributor Advanced breaker point Retarded breaker point Fig EC 123 Schematic drawing of control system for L24 engine with automatic transmission EMISSION CONTROL SYSTEM Note Operation of the switch is affected by hysteresis of the b metal It opens at 529 when tem perature is raised from low to high 20 10 Degree Crank angle Distributor rpm x 102 Manifold heat control thermostat Manifold thermostat 1s installed on the 1972 models This device operates 1n the follow ing manner that is the engine is quickly warmed up and then the coolant in the intake manifold and carburetor 15 kept in constant tem perature at various vehicle speeds This thermostat is shut down when coolant temp
73. does not work properly in step 5 replace the switch with a new one Note When a speed switch must be replaced with a new one replace speed detector with a new one as the kit of a speed switch and speed detector AUTOMATIC TEMPERATURE CONTROL AIR CLEANER Sensor Removal 5 1 Pipe Catch Fixed with adhestve Hose Tab Ja 8 E Ip Gasket EC019 rubber Fig EC 86 Remoual of sensor e OS Q 1 Flatten the tabs of sensor retain ing clip with pliers 7 EC 87 Flattening of tabs 2 Pulloff hoses 43 Note carefully respective positions where each hose has been connected 3 Pry up the catches of clip with a screwdriver 4 Take off sensor and clip Installation 1 Place sensor in correct position 2 Insert clip When doing thus support sensor at its correct position as shown in Figure EC 89 to prevent damage to temperature sensor When placing chp do it while widening the portion of their tab to facilitate the job Fig EC 89 Installing sensor Note Pay particular attention not to damage sensor 3 Reinstall hosed in the same positions as noted in Step 2 under Removal Fig 90 Installing hoses EMISSION CONTROL SYSTEM Inspection Among the possible troubles of this device the most hable to occur 15 the permanent opening of valve This failure will not probably be noticed warm or hot weather but in cold weather i
74. e inlet of 42 Aur inlet pipe Diaphragm Vacuum chamber Diaphragm spring Aur filter Temperature sensor ass y Brmetal gt underhood air and introduce hot air via a stove mounted on the exhaust manifold Vacuum motor ass y To intake manifold 9 Idle compensator ass y 10 Orifice 11 Aur bleed valve closed 12 Hot air pipe 13 control valves 14 Linkage Fig EC 66 Hot air delivery mode During cold engine operation When temperatures become above 100 F the sensor acts to partially open the valve When air temperature further mses and exceed Underhood air 043 inlet pipe Diaphragm Vacuum chamber Diaphragm spring Au filter Temperature sensor ass y NAO WH Fig EC 67 Underhood air delivery mode During hot engine operation Vacuum motor ass y 118 F the valve fully opens stopping the supply of hot air and introducing cold air only into the carburetor To intake manifold 8 B1 metal 9 Idle compensator ass y 10 Orifice 11 Aur bleed valve open 12 Hot pipe 13 control valves 14 Linkage EC 35 In this way the valve automatically mixes underhood air and hot air so as to keep the carburetor air temperature at about 109 F During heavy throttle operation the valve operates so as to obtain sufficient power by fully opening the cold air passage regardless of inlet air temperature Figure EC 68 shows
75. e GLASS Hj ANTENNA Lw E HEATER SW RB IIIJ Wo s 5 ILLI COLOR CODE Hu WIPER MOTOR LI Notes 1 The electrical wiring diagram shows parts and circuits which White used Manual Transmission Model and or the Red SIDE MARKER LH WASHER MOTOR Automatic Transmission Model Yellow Y G B 2 The cutting valve circuit 15 used on the Manual Transmission Eon Model only EC 95 WIRING DIAGRAM B BODY EARTH MODEL PL510TU i SIDE MARKER HEAD LAMP RELAY HORN RELAY LAMP RH WIPER MOTOR BR DOOR Sw n H X OPTION PARTS PARK amp TURN 1 3 LAMP RH ARRAS a ARRIE 000 5 e HAZARD WARNING SW L EAS d ewes RW L HH t eH u Yd ee el C c H T H H R rL T _________ BL LLL uL RB wama In IGNITION SW Yw GY ve STOP LAMP SW WR HH t Hj 6 __ FLASHER UNIT e BG 1 us 8 E mna 00025 0 OO ore 5 GR T En 2 6 TURN SIGNAL SW AUTO SYSTEM perd o IIO TEMP SW 5 M gt 1 0 CHOKE SW DEFROSTER USAONLY TEA
76. e becomes constant for some while at value below set pressure and then falls down to idling negative pressure See diagram C 2 When the operating pressure is exceedingly low the negative pressure will not fall down to idling pressure and the speed of engine 1s not restored to idling speed under this condition the engine speed never reaches above 2 200 rpm In extreme cases the engine speed fails to attain idling speed although the negative pressure becomes equal to that of idling See diagram D When the operating pressure is too low Loosen adjusting screw 5 as outlined below until correct pressure 1s obtained Loosen lock screw 1 Ad justing screw S 1s accessible after detaching cover Slightly turn this ad 7 Justing screw counterclockwise and then race the engine Do not fit tip of Time ECO90 Fig EC 102 Characteristic curve low negatwe pressure screw driver tightly 1n screw slot When operating pressure equals set pressure Negative pressure Set pressure Idling negative pressure Time 3 000 Engine speed rpm 4 to 5 Time sec m Fig 103 Characteristic curve proper negative pressure The manifold vacuum after racing once remains constant at set pressure EC 48 and then falls down to idling pressure In this ease it takes from 4 to 5 seconds for the engine speed to decrease from 3 000 rpm to 1 000 rpm Set pressure Manual
77. e em ploys the Engine Modification Sys tem consisting essentially of the fol lowing units 1 Combustion chambers Modified configuration 2 Transmission controlled vacuum advance for Manual Transmission model only CONTENTS 4 Bi metal and heater EC 9 Fast idle cam EC 9 4 Fast idle adjusting screw EC 9 EC 5 Unloader EC 9 Vacuum diaphragm 9 6 Bi metal index mark EC 9 EC 8 THROTTLE OPENER 9 3 Automatic temperature control cleaner 4 Leaner carburetor with an electric automatic choke 5 Throttle opener TRANSMISSION CONTROLLED VACUUM ADVANCE This system provides the vacuum 4 advance only when gear 5 in the top 4th position and retarded spark timing with no vacuum advance at other positions for complete com bustion This system however allows vacuum advance during the warming up period of enginc in cold weather and provides satisfactory driving per formance immediately after starting the engine EMISSION CONTROL SYSTEM Note Immediately after starting the engine m cold weather vacuum advance 5 allowed for all gear positions Vacuum advance Operation Ignition switch m Fuse Alternator b T L Temperature sensing switch Above 50 F ON Auto choke heater Carburetor vacuum Distributor vacuum cleaner unit Solenoid valve ON Vacuum emitted atmosphere OFF Vacuum actuated
78. e is fully open Carefully observe the following instructions Manual transmission model Test should be conducted after solenoid vacuum valve used on trans mission controlled vacuum advance is deenergized Automatic transmission model Test should be conducted after the dash pot does not operate by loosen ing adjusting screw Adjustment with a vacuum gauge and a tachometer 1 Install tachometer engine tester and vacuum gauge Disconnect the tube of the auto matic temperature control air cleaner and in its vacant place connect a vacuum tube securely Tube connector 5 attached to intake manifold 2 Connector Fig EC 24 Vacuum gauge installation 2 Connect the servo diaphragm vac uum tube directly to the intake man fold connector without laying through the control valve EMISSION CONTROL SYSTEM 3 With negative pressure vacuum in the intake manifold servo dia phragm operates and thus the mary throttle valve is opened When the servo diaphragm normally op erates the engine speed rises reaching 1 700 to 1 800 rpm When the engine speed does not reach thus range turn the adjusting screw properly See Figure EC 25 1 When the engine speed 1s lower than the prescribed range turn the adjusting screw clockwise 2 When the engine speed 15 higher than the prescribed range turn the adjusting screw counterclockwise Upon completion of ad justment set the adjusting screw
79. e to prevent corrosion Carburetor air cleaner element The paper element has been special ly treated Viscous type and there fore no cleaning is required But should be replaced every 24 000 miles CRANKCASE EMISSION CONTROL SYSTEM 1 Check hoses nections for leaks 2 Disconnect all hoses and blow them out with compressed air If any hose can not be free of obstructions replace with a new one 3 Test the crankcase ventilation control valve 1n accordance with the following method With engine running at idle remove the ventilator hose from the crankcase ventilation control valve If the valve is working a hissing noise will be heard as air passes through the valve and a strong vacuum should be felt rmmedh ately when a finger is placed over the valve inlet If the valve is plugged replace with new valve Check for deposit plugging in hose Clean if necessary Normal control valve replacement period 1s every 30 000 miles and hose con Intake manifold ECO14 Fig EC 22 Cross sectional view of crankcase ventilation control valve 4 Crankcase steel net If clogged with slush clean with solvent and dry with compressed air STEEL Fig 23 Crankcase steel net in cylinder block EC 13 EXHAUST EMISSION CONTROL SYSTEM Throttle opener Before adjusting the throttle opener make sure that the engine 15 warmed up and that the automatic choke blad
80. e vane hub bearing with high melting point grease such as ESSO ANDOK 260 b The vanes may require five to ten miles wear m running time In the event a slight squeaking stil persists drive the vehicle about 40 to 50 mph In most cases five to ten miles will be sufficient for wear im 4 Insert one carbon shoe on each side of every vane Note Each carbon shoe must be positioned so chamfered end of shoe faces to vane 5 Insert the shoe spring into each deeper shoe slot Note When sprmgs are properly positioned the curved portion of spring will be against the shoe and Drive pulley EMISSION CONTROL SYSTEM the opposite side will be against wall of shoe slot 6 In the three vane type if rear bearing was removed a new bearing may be pressed into rotor ring using attachment for pressing in needle bearing special tool ST19840000 The bearing should be about 0 0315 inch below rotor ring surface Note Press only on lettered end of the bearmg surface and support rotor ring to prevent its distortion 7 Postion new side seal on rotor ring so that holes up 8 Position the rotor ring so that the marks on rotor ring and side of rotor line up 9 Apply thread locking material to rotor ring retaming screws and tighten them to 22 to 3 6 ft lb 10 Remove the dummy shaft from vanes and insert vane shaft into vane bearings Do not force cover on since it will distort vane bearings and or vane bearing alignment ll I
81. eak adjustment and the stationary part of carburetor gap shown by m the 1 1 Completely close choke valve 3 vacuum break rod with lustration between choke valve and 2 Hold choke valve by stretching a pliers and pull straight fully carburetor body to 0087 inch by rubber band between choke shaft lever 4 Under thus condition adjust the bending vacuum brake rod Vacuum break rod 2 Choke valve ECO56 Fig EC 95 Vacuum break adjustment EC 45 EMISSION CONTROL SYSTEM Choke unloader adjustment 1 Completely close choke valve 2 Hold choke valve by stretching a rubber ring between choke shaft lever and the stationary part of carburetor Dash pot adjustment Automatic transmission cars only 1 It is necessary that the idling speed of engine and mixture have been well tuned up and engine is suf ficiently warm 2 Turn throttle valve by hand and read engine speed when dash pot just touches the stopper lever 3 Adjust the position of dash pot by turning nut until engine speed is in the range of 2 400 to 2 500 rpm 4 Ifa tachometer is not available adjust as follows Locate FI adjusting screw 2nd stage 139 of the FI cam Make sure that the tip of dash pot closely touches stopper lever 3 Open throttle lever until it fully opens 4 Under this condition adjust the clearance the illustration between choke valve and carburetor body to 0205 inch by bending unloader tongue Fig EC 97 D
82. earance Incorrect carburetor adjustment of idle speed idle mixture choke setting Defect or malfunction of the ignition system spark plug high tension cable breaker point ignition coil etc Engine stop Incorrect carburetor adjustment of idle speed idle mixture choke setting or dash pot setting automatic transmission only Incorrect basic timing Carburetor icing MAINTENANCE AND TESTING GENERAL MAINTENANCE Distributor Spark plug Carburetor High tension cable Battery Aur cleaner element CRANKCASE EM SSION CONTROL SYSTEM EXHAUST EMISSION CONTROL SYSTEM Testing of spark advance contro system Testing of accelerator switch PL521 Testing of transmission switch Testing of throttle switch Datsun PL510 and WPL 510 Testing of throttle switch Datsun PL521 Testing of speed switch PL510 and WPL510 with automatic transmission CONTENTS EC 40 AUTOMATIC TEMPERATURE CONTROL EC 40 AIR CLEANER EC 43 EC 40 Sensor EC 43 EC 40 ELECTRIC AUTOMATIC CHOKE EC 44 EC 40 Adjustment EC 44 EC 40 BOOST CONTROLLED EC 40 DECELERATION DEVICE EC 47 Adjustment of operating EC 40 pressure of B C D D EC 47 EC 41 Testing of speed switch EC 41 PL510 WPL510 with automatic transmission EC 48 EC 41 EVAPORATIVE EMISSION EC 42 CONTROL SYSTEM EC 48 Checking of fuel tank vapor liquid EC 42 separator and vapor vent line EC 48 Checking of flow guide valve EC 49 EC 42 EC 43 EC 39 EMISSION CONTROL SYSTE
83. ed extent so as to provide necessary amount of air fuel mixture Bi metal index mark The bi metal index mark 1s used for setting the moment of the bi metal which controls the muxing ratio required for starting the engine THROTTLE OPENER The function of the throttle opener 1s to open the throttle valve of carbu retor shghtly in vehicle coasting con dition During deceleration mamfold vacuum rises and a quantity of ture in the engine 1s not sufficient so that a normal combustion can not continue and a great amount of un burned HC is emitted The carburetor EC 9 equipped with the throttle opener supplies the engine with an adequate charge of combustible mixture to keep proper combustion during decelera tion resulting in remarkable reduction of HC emission The operation of the throttle opener is as follows schematic drawing of the system 15 shown in Figure EC 15 At the moment when the manifold vacuum increases as curs upon deceleration the control valve opens to transfer the mamfold vacuum to the servo diaphragm cham ber and the throttle valve of the carburetor opens slightly As the vehicle speed decreases the manifold vacuum lowers to the predetermined value The control valve begins to close gradually keeping the manifold vacu um at the predetermined constant value As a result both low HC emussion and normal engine brake dunng de celeration are obtained The altitude corrector 1s provided with
84. erature 15 above 150 F Then the flow of coolant 1s stopped in the intake mamfold line LL ue It closes at 34 F when temperature is turned off at 579 it indicates 15 lowered from high to low that the switch is still serviceable Allowable variation of this switch Is within 5 degrees If the switch nn 177x10 Degree Crank angle 20 10 m 14 22 24 Vacuum in ix Fig EC 124 Distributor advanced charataristics EC 62 Case E ring Valve Spring Pellet Supporting case Adjusting nut Case cover On QN tn 4A Fig 125 Manifold heat control thermostat EMISSION CONTROL SYSTEM Hot air type air cleaner The vehicle has hot air type air cleaner with a manual hot air valving at the inlet port of the cleaner The valve is set the winter position when the ambient temperature 1s very low This closes the inlet port and admits hot air around the exhaust manifold thereby facilitating cold starting cold weather Outside air enters the cleaner when the valve is set in the summer position 1 Radiator 2 Water inlet 3 T housing 4 Intake manifold 5 Water outlet 6 Carburetor 7 Carburetor insulator 8 Manifold heat control thermostat 1 control valve 2 Valve lever Fig EC 126 Hot air type air cleaner EC 63 Fig EC 127 Switching for winter and summer starting Temperature control of SU type carburetor by engine coolant
85. ese devices The comparatively flat portion of the curve shown in Figure EC 26 is called Operating depression 6 Operating depression changes depending on altitude and thus servo 14 diaphragm and control valve oper ations are adjusted coincidence with the altitude at which the vehicle 15 driven automatically The graph shown in Figure EC 27 indicates change in operating depression for changes in atmospheric pressure and altitude EMISSION CONTROL SYSTEM Operating depression in Hg Altitude x 103 ft 3 Atmospheric pressure in Hg 4 5 6 7 ECO16 Fig EC 27 Changes in operating depression for changes in atmospheric How to read Figure 27 Determining operating depression and adjustment of control valve 1 When atmospheric pressure is known operating depression 15 found by following the arrow line When altitude 15 known operating depres sion 1s found by following the arrow line 2 Turn the adjusting screw of the control valve See Figure EC 28 and adjust the control valve so that nega tive pressure the 1ntake manifold 15 suspended for a few seconds at the value of operating depression found as described in 1 above while the engine speed decreases from 3 000 rpm to 1 000 rpm pressure and altitude 2 Control valve 3 Lock screw Fig EC 28 Control valve Vacuum adjusting screw Adjustment with a tachometer If a vacuum gauge is not a
86. g service The die cast aluminum pump assembly attached to the front of the engine 15 driven by an air pump drive belt A rotor shaft drive hub relief valve and inlet and outlet tubes are visible on the pump exterior A rotor vanes carbon shoes and shoe springs make up the rotating of the pump The rotor located in the center of the pump 15 belt driven The vanes EC 55 rotate freely around the off center pivot pin and follow the circular shaped pump bore In the three vane type the vanes form three chambers in the housing Each vane completes a pumping cycle 1n every revolution of the rotor Air 15 drawn into the inlet cavity through a tube connected to the air cleaner 15 sealed between vanes and moved into a smaller cavity the compression area After compression the vanes pass the outlet cavity The vanes sub sequently pass the stripper a section of the housing that separates the outlet and inlet cavities Continuing the cycle the vanes again enter the inlet cavity to repeat its pumping cycle The relief valve located in the outlet cavity consists of a preloaded spring seat and pressure setting plug Its function is to relieve the outlet air flow when the pressure exceeds a preset value Carbon shoes support the vanes from slots the rotor The shoes designed to permit sliding of the vanes and to seal the rotor interior from the air cavities Leaf springs which are behind the follower side of
87. ine 2 Inspect the hoses for cracks distortion or plugging Checking of vacuum motor With engine stopped inspect the position of valve placing a murror stall When such a claim has been raised by the user first inspect this device before checking the carburetor Another trouble which might be expected is that the underhood air 15 kept closed by the valve regardless of the temperture of suction air around the sensor while the engine 15 running This trouble appears in the form of extremely excessive fuel consumption or decrease in power The inspection of this device should be proceeded as follows Appearance 1 Furst inspect whether the vacuum hoses are connected to the correct positions Fig EC 36 Correct position of hoses at the end of inlet pipe for inspection The correct condition of valve 1s that it keeps the inlet of underhood air open and that of hot closed Otherwise inspect the linkage of valve SN EC023 Fig EC 37 Inspecting valve position EC 17 2 Disconnect the hose at the vacu um motor inlet and directly apply vacuum of manifold to vacuum motor by connecting another hose sucking by the mouth may be substituted for this process If underhood air inlet 15 closed by the valve valve 1s 1n good condition Inspect linkage if found otherwise And when no defect 1s found in the linkage trouble is in the vacuum motor If the valve does not close then inspect linkage EMISSION CONTROL
88. ing any extensive di agnosis of the exhaust control system it must be determined that the engine as a unit 15 functioning properly Dis connect the anti backfire valve vacuum sensing hose and air supply hose at the intake manifold connections Plug the manifold connector to preclude leak age Plug the anti backfire valve vacu um sensing hose to close the passage to the intake manifold AIS After checking the normal engine operation reinstall all the 15 parts Testing of check valve This test can be performed at the same as the air pump test 1 Operate the engine it reaches normal operating temperature 2 Inspect all hoses and hose connec tors for obvious leaks and correct if necessary before checking the valve operation 3 Visually inspect the position of the valve plate inside the valve body It should be hghtly positioned against the valve seat away from the air distributor manifold 4 Insert a probe into the valve connection on the check valve and depress the valve plate It should freely return to the onginal position against the valve seat when released 5 Leave the hose disconnected and start the engine Slowly the engine speed to 1 500 rpm and watch for exhaust gas leakage at the check valve There should not be any exhaust leakage The valve may flutter or vibrate at idle speed but this is normal due to exhaust pulsations in the man foid 6 If the check valve does not meet the
89. ing ignition timing and adjusting idle speed and mixture High tension cable Use an ohmmeter to check resis tance on secondary cables nect cables from spark plugs and remove distributor cap from distri butor together with the secondary cables Do not remove cables from the cap Connect the ohmmeter between the cable terminal on the spark plug side and the corresponding electrode inside the cap If the resistance 13 more than 30 000 ohms remove the cable from the cap and check the cable resis tance only If the resistance is still more than 30 000 ohms replace the cable assembly Fig EC 76 Cheching of high tension cables EC 40 Battery Test the battery specific gravity with an accurate hydrometer Specific gravity should be at least 1 220 or more with temperature corrections Add distilled water as required to bring fluid to proper level Clean battery posts and cable terminals After tightening clamps coat the battery posts and clamps with light grease to prevent corrosion Air cleaner element The paper element has been specially treated therefore there 1s no need to clean it It should be replaced every 24 000 miles CRANKCASE EMISSION CONTROL SYSTEM 1 Check hoses nections for leaks 2 Disconnect all hoses and blow them out with compressed air If any hose can not be free of obstructions replace with a new one 3 Test the crankcase ventilation control valve as follows With engine running
90. ired normally Normally it will be sufficient to conduct the following inspections After completing the adjustment of idling speed with the engine which 15 performing air injection 1 Increase the engine speed once up to 2 000 rpm without applying load and release the accelerator linkage from holding with hand quickly 2 The servo diaphragm operates once at the full stroke 0 1969 inch the stroke returns gradually as the speed lowers and when the speed returns to idling speed the opera tion will be released completely 3 It 1s normal that required lowering speed from 2 000 rpm to 1 000 rpm T 1n Figure EC 136 is approximately three seconds In the event of the following cases adjustment or replacement of parts concerned is required First perform adjustment in ac cordance with the instructions for periodical inspection and adjustment 4 In the case that the servo dia phragm operates continuously and speed does not lower or time required in lowering speed from 2 000 rpm to 1 000 rpm 15 too long six seconds or longer and speed does not return to the idling speed timely Operating negative pressure Hg 0 10 20 30 Cause Control valve operating nega tive pressure is too low low boost 5 In the case that the servo dia phragm does not operate or the servo diaphragm operates but does not fully stroke Cause Control valve operating nega tve pressure 15 too high high bo
91. ith a tachometer 1 Warm up the engine sufficiently 2 Continue engine operation for one minute under idling speed 3 Adjust the throttle adjusting screw and idle adjusting screw cor rectly so that best engine idling speed 1s obtained 750 rpm for vehicle with manual transmission and 780 rpm for vehicle with automatic transmission 4 Turn the idle adjusting screw clockwise for a leaner mixture and reduce the engine speed to 700 rpm 750 rpm for the vehicle with auto matic transmission S In the case of an automatic trans mission model make sure that 1dling speed 15 approximately 600 rpm when the shift lever 1s set to D range Adjusting with CO meter and tachometer 1 Warm up the engine sufficiently 2 Contmue engine operation for one minute under idling speed 3 Adjust the throttle adjusting screw so that engine speed 1s 700 rpm for the vehicle with manual transmis sion 750 rpm for the vehicle with automatic transmission 4 Adjust the idle adjusting screw so that CO percentage is 2 0 5 Repeat the adjustments as de scribed in 3 and 4 above so that CO percentage 5 20 at 700 rpm CO percentage 2 0 at 750 rpm the case of an automatic transmission model 6 the case of an automatic trans mission model make sure that the idling speed 1s approximately 600 rpm when the shift lever is set to D range 1 Throttle adjusting screw 2 Idle adjusting screw Fig EC 48 Throttle adjusting screw and idle
92. ld be replaced at maximum intervals of 12 000 miles 2 Distributor Fig EC 19 Checking distributor breaker point gap EC 12 blast cleaner Inspect each spark plug Make sure that they are of the specifi ed heat range Inspect insulator for cracks and chips Check both center and ground electrodes If they are excessively worn replace with new spark plugs File center electrode flat Set the gap to 0 0315 to 0 0355 inch using the proper adjusting tool Spark plug should be replaced every 12 000 mules Fig EC 20 Checking spark plug point gap EMISSION CONTROL SYSTEM High tension cable Use ohmmeter to check resistance on secondary cables Dis connect cables from spark plugs and remove distributor from distn butor together with the secondary cables Do not remove cables from the cap Connect the ohmmeter between the cable terminal on the spark plug side and the corresponding electrode inside the cap If the resistance 15 more than 30 000 ohms remove the cable from the cap and check the cable resis tance only If the resistance is still more than 30 000 ohms replace the cable assembly Battery Measure the specific gravity of elec trolyte with an accurate hydrometer Specific gravity should be at least 1220 or more Add distilled water as required to bring fluid up to proper level Clean battery posts and cable ter minals After tightening the clamps coat the battery posts and clamps with light greas
93. lock Servo diaphragm Servo diaphragm stroke nut stationarily and make sure that the engine speed 15 in the prescribed range correctly 1 Adjusting screw 2 Lock nut Fig EC 25 Servo diaphragm adjusting Manifold vaccum 4 Disconnect the servo diaphragm vacuum tube from the intake man fold and connect it to the control valve Connect the vacuum tube of the control valve to the intake manifold normal piping 5 primary throttle valve 15 opened by the hnk connected to it When the engine speed 15 1ncreased to approximately 3 000 rpm and lower ed naturally from this speed changes in servo diaphragm link stroke intake manifold vacuum and engine speed are as shown in Figure EC 26 o gt Servo diaphragm hnk stroke a amp E 0 gt fa Intake manifold vacuum 3000 5b Engine speed 5 a A v ap z s 5 Time second 2000 1000 EC015 Fig 26 Changes in servo diaphragm link stroke intake manifold vacuum and engine speed As the engine speed lowers nega tive pressure generated in the intake manifold also lowers However drop ping of negative pressure in the intake manifold 15 suspended for a few seconds by operating the servo dia phragm and control valve In the graph shown in Figure EC 26 curve is comparatively flat Thus HC emission emitted under these conditions 15 controlled by th
94. n is freely introduced through the vacuum hose 1 Flow guide valve 2 3 Solenoid valve assembly AUTOMATIC TEMPERATURE CONTROL AIR CLEANER The automatic temperature control 005 distributor Fig EC 8 Vacuum tube diagram ar cleaner 5 of a special type equipped with a temperature sensor and vacuum operated valve vacuum acting on the ar control valve is controlled by the temperature sensor See Figure EC 9 1 pipe 2 Vacuum motor assembly 3 Temperature sensor assembly 4 Hot atr pipe 5 control valve ECOO6 Fig EC 9 Automatic temperature control air cleaner 6 EMISSION CONTROL SYSTEM If the temperature of suction atr 15 valve closes the underhood ar inlet cover which is installed on the exhaust low when the engine 15 running the and introduces hot air through the manifold See Figure EC 10 manifold KY 9 Aur inlet pipe 1 2 Aurcontrol valve 3 Diaphragm spring 4 Diaphragm 5 Vacuum hoses 8 6 bleed valve closed 7 Hot ur pipe Ecoo 8 Temperature sensor Hot air assembly Fig EC 10 Hot air delwery mode During cold engine operation When the temperature of suction suction air around the sensor further entrance of hot air and allows under air around the sensor reaches 110 F rises and reaches above 120 F the alone to be introduced into or above the sensor actuates to open valve completely opens to
95. nal controls and also eliminates buretor 1cing ELECTRIC AUTOMATIC CHOKE An electric heater warms a bi metal interconnected to the choke B110 equipped with Fig EC 13 EC 8 H EMISSION CONTROL SYSTEM Bi metal and heater Electric current flows through the heater as the engine starts and warms bi metal See Figure EC 5 The deflection of bi metal 1s transmitted to the choke valve through the choke valve lever Fast idle cam The fast idle cam determines opening of throttle valve so as to obtain proper amount of mixture cor responding to the opening of the choke valve which depends upon the warmed up condition of the engine Fast idle adjusting screw This screw adjusts the opening of the throttle valve of fast idle cam Unloader When accelerating the vehicle dunng the warm up period that 1s before the choke valve does not sufficiently open this unloader makes Bi metal Heater Brmetal cover Fast idle cam Bi metal index mark Choke shaft lever Choke valve Unloader tongue 10 Vacuum diaphragm ECO10 11 Throttle valve 12 Fast idle adjusting screw 00 OQ Q G N Fig EC 14 Construction of electric automatic choke the choke valve open to a certain extent so as to obtain an adequate air fuel mixture Vacuum diaphragm The moment when engine 15 ready to start by cranking this diaphragm forces open choke valve to the pre determin
96. ncreases to an objectionable level the bearing may have to be replaced 3 Rear bearing noise This noise 15 identified by continuous knocking sound When this noise occurs dismount the pump from the vehicle and inspect carefully Off car 1 With the pump removed from vehicle rotate hub in jerks three quarters of one full turn forward and one quarter of one full turn backward If roughness or bumps EC 75 Drive belt improperly adjusted Misaligned or defective pulley Replace Replace felt remove the rear cover 2 Inspect carbon seal This seal should not have any holes caused by wear or be broken or cracked Such condition commonly results from defective rear and or vane bearing failed seal must be replaced 3 With rear rotor ring and carbon seal removed pull out the vanes Vane bearing failure is also indicated by absence of grease or caked grease Inspect vane shaft to confirm this bearing failure All corners of vanes should be square When edges are broken replace the vanes 4 Remove carbon shoes and inspect surface contacting with the vane Small grooves in shoes are normal Replace if chipped or broken Broken shoes indicate improper assembly of shoe springs Damaged shoes must be replaced and springs must be properly installed 5 Carbon dust may be present vanes and in housing This 15 indication of normal wear Remove carbon dust by blowing compressed air to the parts 1n
97. nfinity or zero corresponding with the actuater of the switch being pushed or released the switch 15 proper Check and adjust the position of the micro switch by adjusting screw so that the actuater of the micro switch may allowed to travel 003 inch when the cam plate pushes up the actuater EMISSION CONTROL SYSTEM 6 If in step 5 the switch 5 found to be malfunctioning replace the micro switch with new and adjust the position of the new one as mentioned step 5 Testing of speed switch PL510 and WPLS510 with automatic transmission 1 Disconnect the lead wires at speed switch 2 Figure EC 84 is the equivalent electric circuit of the speed switch Equivalent electric circuit of speed switch Terminal numbers 4 4 3 EC085 Fig EC 84 Speed switch Connect the wires between the terminals of the speed switch and the battery terminals as shown Figure EC 85 Connect the voltage meter to the terminal 3 Fig EC 85 Testing of speed switch 3 The voltage meter should indicate 12 volts It should indicate zero when the terminal 2 is disconnected from the battery 4 the switch does not work pro perly step 3 detach the cover and inspect the position of the armature and return spring 5 If the position of the armature and return spring 1 out of order set them in position and take same measurement as indicated step 3 6
98. nstall the end cover First set the position of the end cover by temporarily tightening bolts adjacent to the dowels and then retighten all the four bolts Reinstalling the air pump Reinstall the air pump in reverse sequence of removal Adjust the belt tension so that it has about 05 inch of slack under thumb pressure Reinstall the pump 15 reverse sequence of removel noting the following points Adjust the belt tension so that it has about 05 inch of slack under thumb pressure l Loosen the air supply pump adjusting bar nut and bolt to relieve the belt tension 2 Remove the drive pulley attach ing bolts Anti backfire valve When removing the anti backfire valve disconnect the hoses No further disassembly should be done After installation check the valve operation and inspect all hoses and hose connections for leaks Check valve 1 Disconnect the air supply hose 2 Remove the check valve from the ar gallery pipe holding the flange of air gallery pipe with wrench Note a Be careful not to damage the air gallery pipe b No further disassembly should be done 3 the check valve in reverse sequence of removal Note Tightenmg torque 15 65 to 76 ft lb 4 After installation check the valve hoses and hose connections for air leakage Air gallery pipe and injection nozzles It s very difficult to remove the air gallery from the exhaust manifold without bending the pipe which could resul
99. o Recommended fuel grade Transmission type Ist 2nd 3rd 4th Rev Final gear ratio Curb weight Ib Regular F4W63 1419 1 000 3 638 4375 2 200 Type of crankcase emission control Type of exhaust emission control Closed type Engine modification system PLS21TUH MEE elas T t 2 190 f 1 HITACHI DAH328 3B Down draft Dual throat Secondary 0 906 1102 0 3543 Carburetor Make Model Type Barrel 2 Primary Bore in dia 1260 Large venturi In dia Small venturi Ist India 2nd india Main jet 155 Main air bleed Slow jet Slow air bleed me EC 85 FTT IA EMISSION CONTROL SYSTEM Item Power jet Injection volume cu m Dumper spring oz Vacuum jet Choke Fast idle Alternator Make Model Capacity Distributor Make Model Condenser Spark plug Make Model Flow guide valve Make Model Opening pressure in Hg Spark timing control system Thurd gear switch Throttle switch position Temp sensing switch Tune up data Basic timing Idling speed rpm CO percent setting Distributor dwell angle Spark plug gap in EC 86 PL521TU PL521TUH lt 0 03 265 150 130 Electric automatic choke 159 HITACHI LT135 13 12 35 HITACHI lt 412 81 0
100. ody with a thickness gauge 5 The clearance should be 0 0315 inch If 1t 15 not over or under 0 0315 inch loosen the adjusting screws and turn the throttle switch itself so that 1 Adjusting screw 2 Switch 1 3 Coupler 4 Terminal 3 5 Terminal 2 6 Terminal 1 7 Switch 2 ECOB3 Testing of throttle switch Datsun PL521 1 Make sure of the insulation of the lead wire terminal to the throttle switch body 2 Disconnect the lead wires at the throttle switch and connect the ohmmeter to the terminals Fig EC 83 Testing of throttle switch EC 42 the clearance may be 0 0315 inch and tighten the adjusting screws 6 Disconnect the coupler and con nect the ohmmeter to the terminals 1 and 2 or 1 and 3 7 The ohmmeter should indicate infinity when the accelerator pedal 1s released or depressed fully It should indicate zero when the pedal Is partially depressed 8 If the switch does not work well in step 7 replace the switch as sembly 9 Install the cover and connect coupler securely Clearance 0 0315 inch Fig EC 82 Throttle switch 3 ohmmeter should indicate zero when the throttle valve 15 closed or partially opened until 40 degrees And it should indicate infinity when the throttle valve 1s opened over 40 degrees 4 does not function properly keep the throttle valve closed and push the actuater of the switch several times by finger 5 Ifthe ohmmeter indicates i
101. ost Altitude adjusting of thottle opener at every 12 000miles Control valve operating negative pressure changes in response to alt tude as described previously Hence operating negative pressure to be ad justed should change in response to the altitude the atmospheric pressure of the place where the vehicle is driven Figure EC 135 indicates rela tionship between operating pressure to be adjusted and altitude atmospheric pressure Atmospheric pressure in Hg 40 50 60 70 Altitude x 102 ft Fig EC 135 Operating negatie pressure of control valve EC 68 EMISSION CONTROL SYSTEM How to read the Figure EC 135 lt af o When the atmospheric pressure of lt the place where the vehicle 15 driven 15 known read the operat ng nega tve pressure by following arrow mark A When atmospheric pressure is unknown read operating negative pressure by following arrow mark from the altitude of that place o When operating negative pressure to be adjusted s known conduct inspec and adjustment in accordance with the following instructions With the engine for which idling speed adjustment has been completed and which 15 performing atr injection 1 Connect a vacuum gauge to the connector AB valve 2 Raise the speed once up to 2 000 rpm without applying load and release the accelerator linkage from holding by hand quickly 3 Make sure that the manifold vacu um rises con
102. ough 15 above 17 On the automatic transmission model idle speed becomes about 600 rpm when gear position is set to Drive Notes a In case ignition timing 15 check ed the adjustment of the point gap of the spark plug described general maintenance must be made at the same time Make the point gap adjustment first since the ignition timing changes when it 15 made after the ignition timing 15 adjusted EC 50 b If you set the idle speed and mixture by using CO meter the following procedure should be done after step 7 above 1 Set the idle speed at 700 rpm 720 rpm for the automatic trans mission vehicles by turning throttle adjusting screw 2 Adjust the percentage of the carbon monoxide to 2 095 at 700 rpm 720 rpm for automatic transmission vehicles by turning the idle adjusting screw and throttle adjusting screw 3 Check the ignition timing Timing should remain 7 BTDC at 700 rpm 720 rpm for automatic transmis sion vehicles 4 Adjust the engine speed at 700 rpm 600 rpm for automatic trans mission vehicles at drive range by the throttle adjust screw SERVICE SECTION L24 EMISSION coNTRoL 124 ENGINE SYSTEM GENERAL DESCRIPTION EC 53 CRANKCASE EMISSION E54 CONTROL SYSTEM EXHAUST EMISSION EC 54 CONTROL SYSTEM EVAPORATIVE EMISSION EC 84 CONTROL SYSTEM MAINTENANCE AND TESTING EC 66 ADJUSTING ENGINE IDLING T SPEED AND GAS MIXTURE TROUBLE DIAG
103. prevent the the carburetor See Figure EC 11 the valve When the temperature of 3 z 1 aa 1 inlet pipe 2 Arcontrol valve Underhood air 4 3 Diaphragm spring gt 4 Diaphragm 5 Vacuum hoses 6 bleed valve fully open O 7 Hot air pipe D EFO0B Temperature sensor assembly Fig EC 11 Underhood atr delivery mode During hot engine operation ui MR EMISSION CONTROL SYSTEM The valve acts the manner described previously and the tem perature of suction air around the o d Underhood air Hkas When the engine 15 operating under heavy load the valve fully opens the underhood air inlet to obtain full power regardless of the temperature around sensor This control of carburetor temperatures allows leaner carburetor calibration with accompanying re Up Z 8110 equipped with p sensor 15 always kept at about 1 109F See Figure EC 12 inlet pipe Aur control valve Diaphragm spring Diaphragm Vacuum hoses Air bleed valve partially open Hot air pipe Temperature sensor 09 assembly Hot ar Fig EC 12 Regulating air delwery mode A S valve and controls the position of choke valve and throttle valve in accordance with the elapse of time or the warm up condition of engine The construction and function of each part of this carburetor are as follows See Figure EC 14 duced emissions than conventio
104. r pedal This switch 15 set at the dashboard This show when the pedal 15 Accelerator pedal ECO32 Fig EC 54 Accelerator switch installation Transmission PLS10 WPL510 and 521 with fork rod in the transmission The third manual transmission gear switch shows when gear third gear switch The switch is operated by the position 1s in third otherwise showing This switch 15 applicable to the movement of the striking rod and the OFF Third gear switch 2 Reverse gear switch Fig EC 55 Gear switch installation EC 31 EMISSION CONTROL SYSTEM Temperature sensing switch 1 Hood lock control 2 Temperature lever sensing switch Fig EC 56 Position of temperature sensing switch Speed switch and speed detector These are applicable to the PL510 and WPLSIO with automatic trans mission The speed detector is set in the middle of the speedometer cable at dashboard to transmit the variation of vehicle speed to speed switch The speed switch shows OFF when the vehicle speed 15 0 to 13 mph and when it exceeds 13 mph BN 034 Fig 57 Sectional view of speed detector Throttle switch operates together with accelerator pedal Speedometer 3 Speedometer 2 Speed detector cable Fig EC 58 Speed detector 6 60 Throttle 0 X switch The following table shows the operational condition of the throttle s
105. r the retarded breaker point and ground 2 Set the ignition key position Do not start the engine 3 Make sure that the temperature sensing switch 15 ON and the room temperature 15 above 5202 Then make sure that the ammeter indicates about 3 amperes Retarded side terminal Advanced side terminal 050 Ignition Fig EC 137 Testing of spark advance control system EC 69 In case the ammeter indicates zero in step 1 1 Check whether or not relay termi nals are loose 2 If they are in correct conditions disconnect terminals of relay and measure the voltage between terminal and ground See Figure EC 138 Relay Voltmeter Ground 051 Fig EC 138 Measurement of voltage 3 In case the voltage 1s zero some thing must be wrong with the relay which must be replaced 4 case the voltage 15 approxi mately 12V something must be wrong with temperature sensing switch which must be replaced Inspection of manifold heat control thermostat Troubles Defects in mamfold heat control thermostat can cause improper engine operation such as Kept closed The temperature of carburetor and intake manifold do not rise which in cold weather may cause hesitation and backfire Kept open In hot weather percolation may occur in the carburetor causing un stable idling and hesitation at accelera tion EMISSION CONTROL SYSTEM Checking of operation
106. re The negative pressure which has once risen 15 kept constant at a certain value operating pressure for about one second and then gradually falls down to the idling negative pressure See diagram B When the operating pressure 1s too high ILON 1 Lock screw L 2 Adjusting screw S 3 Cover Fig EC 101 Adjusting operating pressure Tighten adjusting screw S as outlined below until correct pressure 1s obtained Loosen lock screw L Ad justing screw is accessible after detaching cover Slightly turn this adjusting screw clockwise and then race engine Do not fit tip of screw driver tightly in screw slot EMISSION CONTROL SYSTEM Notes a Turning adjusting screw S one eighth rotation in either will cause a change oper ating pressure of 0 79 inch Hg Thus counterclockwise to increase the negative pressure from 21 26 to 22 05 inch Hg for example Turn adjusting screw clockwise adjusting screw s left hand to decrease the negative pressure threaded from 22 05 to 21 26 inch Hg b Tum adjusting screw 5 for example Insufficient operating pressure of B C D D Negative Negative pressure pressure C D Set TERMES Bet Isu o Operating pressure Idling negat ve pressure Time 1 When the operating pressure IS somewhat low the negative pressur
107. t the check valve 5 Insert the open pipe end of the air pump test gauge adapter special tool ST19870000 in the air supply hose Clamp the hose securely to the adapter to prevent it from blowing out Position the adapter and test gauge so that the blast emitted through the drilled pipe plug will be harmlessly dissipated 6 Install a tachometer on the engine With engine speed at 1 500 rpm observe the pressure produced at the test gauge Air pressure should be 0 63 inch Hg or more EMISSION CONTROL SYSTEM 7 the ar pressure does not meet the above pressures proceed as fol lows 1 Repeat 2 and 3 above 2 Disconnect the supply hose at antr backfire valve Plug air hose opening and screw with a clamp Repeat the pressure test 3 Check the filter element 4 With engine speed at 1 500 rpm close the hole of the test gauge by finger If a leaking sound 15 heard or leaking air 15 felt by finger at the relief valve the relief valve is malfunction ing The relief valve should be replaced or repaired 5 If the injection pump does not meet the minimum requirement of the pressure test 1t should be replaced Fig EC 134 Testing of relief valve ENGINE MODIFICATIONS Functional inspection of throttle opener at first 600 miles and every 12 000 miles The control valve operating nega tive pressure is precisely adjusted when shipped from the plant and therefore no complicated adjustment 15 requ
108. t in fractures or leakage There fore the removal of the ar gailery pipe and injection nozzles should be done only when they are damaged Lubricate around the connecting portion of the air injection nozzle and air gallery with engine oil 2 Hold the air injection nozzle hexagon head with a wrench and unfasten the flare screw connecting __ the gallery to nozzle Remove the aur gallery EC 60 Note a Apply engine oil to the screws several times during the above work b Be careful not to damage other parts 3 Unfasten the air injection nozzle from the cylinder head applying the engine oil to the screwed portion several times 4 Check the gallery and nozzle for fractures or leakage Clean air injection nozzle with a wire brush 5 At the time of Installation assemble the nozzle seat on the Injection nozzle and tighten the air injection nozzle to a torque of 41 to 55 0 ft Ib 6 Hol the air injection nozzle hexagon head with a wrench and tghten the flange screw of the air gallery to a torque of 36 to 43 ft Ib 7 Check the cylinder head air injection nozzle and air gallery for leaks with the engine running ENGINE MODIFICATIONS Throttle opener This engine modification system consists of a vacuum control valve which detects negative pressure of the intake manifold and operates the servo diaphragm which controls car buretor throttle valve response to the vacuum control valve oper
109. t may disclose itself as an abnormal performance of engine such as tardy acceleration hesitation or engine stalhng When any type of lean operation 15 perceived always inspect this device before doing any work on the carburetor Another trouble which might be expected is that the inlet of under hood air is kept closed by the valve regardless of the inlet air temperature while the engine is running This trouble will appear as extremely excessive fuel consumption or insuf ficiency of power This device should be inspected as follows Visual check 1 Frust inspect whether the hose 15 connected 1n the correct position 2 Inspect hose or the like for crack distortion clogging or melting Checking of vacuum motor 1 With the engine shut off inspect the position of valve placing a mirror at the end of inlet pipe facilitates the Job The correct condition of valve should be such that it keeps the inlet of open and that of hot closed If otherwise inspect the linkage of valve Fig EC 91 Inspecting the position of valve 2 Disconnect the hose of vacuum motor inlet and directly apply the negative pressure of manifold to the vacuum motor by connecting another hose sucking by the mouth may substitute for t If the inlet of underhood air s found to be closed it shows the correct condition of valve If otherwise inspect linkage If no defect 15 found the linkage it indicates the trouble of
110. tle chamber Vacuum break adjustment 1 Completely close the choke valve 2 Hold the choke valve by stretch ing the rubber band between choke shaft lever and the stationary part of carburetor 3 the vacuum break stem with pliers and pull out fully Choke valve Vacuum break rod Vacuum break stem Choke unloader adjustment 1 Completely close the choke valve 2 Hold the choke valve by stretch ing a rubber ring between the choke shaft lever and the stationary part of the carburetor 3 Open the throttle lever until it EC 19 ECO25 Fig EC 40 Fast idle adjustment 4 Under this condition adjust the gap shown by in the Illustra tion between the choke valve and carburetor body to 0038 inch for manual transmission vehicle and 0 042 inch for automatic transmission vehicle by bending vacuum break rod ECO26 Fig EC 41 Vacuum break adjustment fully opens 4 Under this condition adjust the clearance in the illustration be tween the choke valve and the carbure tor body to 0079 inch by bending unloader tongue S EMISSION CONTROL SYSTEM Note Make sure that the throttle valve fully opens when the car buretor is mounted on the vehicle If the throttle valve fais to open Choke valve Dash pot adjustment Automatic transmission vehicles only 1 It is necessary that the idling speed of engine and mixture have been well tuned up and engine is sufficient ly warm 2 T
111. tor air cleaner element CRANKCASE EMISSION CONTROL SYSTEM EXHAUST EMISSION CONTROL SYSTEM GENERAL MAINTENANCE To make sure that exhaust emis sions maintained at a low level it 15 recommended that inspection must be conducted every 12 months or every 12 000 miles Best engine operation and minimum exhaust emissions will be obtained through periodical inspections and from commended servicing at these tervals Carburetor Check the choke setting and adjust to the specifications as required Proper carburetor idle mixture ad justment 15 imperative for best exhaust emission control Refer to the article given in _ justing ignition timing engine idling speed and gas mixture goth Thickness gauge CONTENTS EC 12 Throttle opener EC 13 EC 12 Transmission EC 12 controlled vacuum advance EC 16 EC 12 Automatic temperature control EC 13 air cleaner EC 16 EC 13 Electric automatic choke EC 19 EC 13 Bi metal setting EC 20 EVAPORATIVE EMISSION CONTROL EC 13 SYSTEM EC 20 Checking fuel tank vapor liquid EC 13 separator and vapor vent line EC 20 Checking flow guide valve EC 21 Distributor Spark plug Check the distributor breaker Remove and clean plugs in a sand points for abnormal pitting and wear Replace necessary Make sure they are in correct alignment for full con tact and that point dwell and gap are correct Clean and apply distributor grease to the cam and wick Breaker points shou
112. transmission vehicle 21 85 to 22 44 inch Hg Automatic transmission vehicle 21 06 to 21 65 inch Hg When the operating pressure 15 equalized to set pressure install cover and tighten lock screw 1 securely Testing of speed switch PL510 and WPL510 with A T Refer to the instructions under Testing of speed switch 510 and WPLS10 with automatic transmus sion Page EC 43 EVAPORATIVE EMISSION CONTROL SYSTEM Checking of fuel tank vapor liquid separator and vapor vent line 1 Check all hoses and fuel tank filler cap 2 Disconnect the vapor vent line connecting flow guide valve to vapor liquid separator 3 Connect a 3 way connector manometer and a cock or an equiva lent 3 way change cock to the end of the vent line 4 Supply fresh into the vapor vent line through the cock little by little until the pressure becomes 14 5 anch Aq _ 5 Shut the cock completely and leave it that way EMISSION CONTROL SYSTEM 6 After 25 minutes measure the height of the liquid in the manometer 7 Variation of height should remain within 1 0 inch Aq 8 When the filler cap does not close completely the height should drop to 3 way connector Cock Ar Checking of flow guide valve 1 Disconnect hoses connected to the flow guide valve 2 lower pressure 15 pressed Into the flow guide valve from ends of vent line of fuel tank side the air should go through the valve
113. trol valve operates the manifold vacuum is transferred to the servo diaphragm and that the servo diaphragm operates once at the full stroke O 1969 inch 4 Thereafter both speed and mam fold vacuum decrease or when one to two seconds are elapsed both of them stop lowering Figure EC 136 shows these phenomena E a 22 T 13 5 ga 2 000 ES a oo 1 000 Time sec C078 Fig EC 136 5 Manifold vacuum at that time 5 called Operating negative pressure Loosen the lock screw 2 and adjust the vacuum adjusting screw 1 correctly so that the operating nega tive pressure meets the value obtained from the Figure EC 135 When the above descnbed phe nomena cannot be identified drive the vehicle actually and perform coasting The phenomena will be verified more practically When actually driven and such phe nomena still cannot be identified the operating negative pressure of the con trol valve is damaged or servo dia phragm 15 erroneously adjusted or damaged 6 Upon completion of the above described adjustments confirm the operation through conducting the routing inspection and make sure that required lowering speed from 2 000 rpm to 1 000 rpm without applying load is less than 6 seconds Testing of spark advance control system Disconnect the lead wires from the terminal of the distributor and connect the ammeter between the lead wire fo
114. ty of the valve 15 sufficient to handle any blow by and a small amount of ventilating air Ventilating air is drawn from the clean side of the carburetor cleaner through the tube connection into the crankcase Under full throttle condition the manifold vacuum 1s insufficient to draw the blow by flow through the valve and the flow goes through the sealed system in the reverse direction In vehicles with an excessively high blow by some of the flow will go through the tube connection to the carburetor air cleaner at all conditions Fresh air Blow by gas 52098 109 Closed type crankcase ventilation PERIODIC SERVICE Once year or every 12 000 miles the crankcase emission control system should be serviced as follows 1 Check hoses and hose connectors for leaks 2 Disconnect all hoses and blow them out with compressed If a hose is not free from obstructions replace with a new one 3 Check the crankcase ventilation control valve for the correct function If the valve is found defective replace with a new assembly EXHAUST EMISSION CONTROL SYSTEM AIR INJECTION SYSTEM pump Air injection into each exhaust port Ant backfire valve Check valve Air pump relief valve REMOVAL DISASSEMBLY AND INSPECTION Air pump Drive pulley Anti backfire valve CONTENTS EC 55 Check valve EC 60 EC 55 Air gallery pipe and injection nozzles EC 60 EC 56 ENGINE MODIFICATIONS E
115. ure control valve 4 and vacuum Carburator TT axem D 343 Fig EC 72 Construction of B C D D control valve 2 so that the manifold vacuum may be kept at the pre determined value The amount of mixture mainly depends upon the coasting air bleed II 5 while 115 mixture ratio 15 determined by the coasting jet Z and coasting air bleed 1 6 EVAPORATIVE EMISSION CONTROL SYSTEM DESCRIPTION Datsun PL510 WPL510 and PL521 DESCRIPTION This system 15 composed of the following four basic elements 1 Fuel tank with positive sealing filler cap 2 Vapor iquid separator 3 Vapor vent line 4 Flow guide valve CONTENTS EC 37 EC 37 Flow guide valve Datsun PL510 WPL510 and PL521 When the engine 15 rest evapo ration gas produced the closed type fuel tank fills the vapor vent line vapor liquid separator and fuel tank flow guide valve opens when the gas pressure 15 above 0 4 inches Hg The gas passed through the flow guide valve 2 15 stored the crankcase EC 37 EC 38 Once the engine starts operation evaporation gas crankcase mani fold and carburetor air cleaner are sucked into the manifold for com bustion When the pressure of the closed type fuel tank vapor liquid separator and vapor vent line be comes negative by decreasing the fuel the flow guide valve 1 opens to send fresh air from the carburetor air cleaner to the fuel tank
116. urn throttle valve by hand and read engine speed when the dash pot fully the unloader becomes in operative resulting m poor ac celeration after started the engme 15 027 Fig EC 42 Choke unloader adjustment just touches the stopper lever 3 Adjust the position of the dash pot by turning the nut until the engine speed 15 in the range from 1 900 to 2 000 rpm 4 Make sure that the engine speed is smoothly reduced from 3 000 to 1 000 rpm about five seconds Fig EC 43 Dash pot adjustment EC 20 Bi metal setting 1 Measurement of bi metal heater resistance Install the bi metal cover in place on the carburetor Make sure that the resistance across the terminal and the carburetor body is in the range from 92 to 96 ohms Measure the resis tance without the flow of electric current through the heater and at about 70 F Note Use an accurate measuring m strument such as a wheatstone bridge 2 Brmetal cover setting Position the bi metal cover until the index mark is aligned at the middle point of the scale Note When somewhat over choked set br metal cover after turning it clockwise by about one division of the scale graduations Bi metal cove EC 44 Brmetal cover setting EVAPORATIVE EMISSION CONTROL SYSTEM Checking fuel tank vapor liquid separator and vapor vent line l Check all hoses and fuel tank filler cap 2 Disconnect the vapor vent line connecting flow guide valve to vapor
117. vacuum C Fig EC 92 Inspecting vacuum motor 3 The valve shows the correct condition if it keeps inlet of underhood air closed when the passage in the hose 1s stopped by bending or clamping t while applying vacuum If otherwise 1t indicates that leakage 15 taking place 1n vacuum motor When defect is found at this portion replace the assembly Checking of sensor Check the air cleaner with the engine running below 86 F Make sure that the engine 1s cooled down before test is conducted 2 Assure yourself of valve position before starting It Is correct if the inlet of the underhood am side 15 fully open 3 Start engine and operate idling It indicates the correct condition of valve if the inlet of underhood air becomes fully closed immediately after starting 4 Careful watch the valve to ascertain that t gradually begins to open as the engine warms up But when the ambient temperature 15 low it takes considerable length of time for the valve to begin to open or it hardly opens This should not however be regarded as trouble If the valve does not operate satisfactorily or any doubt 15 left as to its operation further conduct the 44 following test 5 Remove cleaner cover and stick a thermister or a small therm ometer as close to the sensor as possible with tape or the like Place the air cleaner cover again Fig EC 93 Checking sensor 6 Start the engine and continue idling in accor
118. vailable use the following steps EC 15 Install a tachometer 2 With the engine unloaded crease the engine speed to 3 000 rpm and release the throttle valve lever Normally the engine speed lowers as shown in Figure EC 26 3 time required lowering the engine speed from 3 000 rpm to 1 000 rpm 15 normaly 40 05 seconds 1n case of manual transmission or 30 0 5 seconds in case of auto transmission 1 When engine speed lowers in Shorter time than this range turn the adjusting screw of the control valve clockwise 2 When the engine speed lowers in longer time than this range turn the adjusting screw of the control valve counterclockwise Upon completion of the adjust ment tighten the lock screw and make sure again that the throttle valve closing timing 15 correct Notes a When turning the vacuum adjust ing screw do not depress the screw with a screwdriver b When measunng operating depression and engine speed slow down time be sure to tighten the lock screw of the control valve first c When the servo diaphragm does not draw the link or operating depression 15 high vacuum turn the vacuum adjusting screw clockwise When the servo diaphragm draws the link at idling speed or operating depression is low vacuum turn the vacuum adjusting screw counter clockwise Set the lock screw stationariy repeat the above described adjust ment and make sure that the oper ating depression is corre
119. ving cover EMISSION CONTROL SYSTEM 3 Remove the end cover by care fully tapping the surrounding of the large dowel pin with a plastic mallet and lifting up straight 4 Put match marks O on the rotor ring and side of rotor to ensure correct reassembly and remove six screws that retain the rotor ring to the rotor using a hexagonal wrench special tool 5719810000 Note Generally match marks mdicated on both rotor and rotor by the manufacturer Fig EC 116 Removing rotor ring 5 Remove the rotor ring and side carbon seal from the rotor 6 In the three vane type if it is necessary to replace the rear bearing 1 may be pressed out of rotor ring on a press using a support for disassembling rotor ring and attachment for pushing out needle bearing Special tool Support for diassembling rotor ring STECP ST19820000 Attachment for pushing out needle bearing STECP ST19830000 Note Support rotor ring carefully to avoid distortion Fig EC 117 Removing rear rotor bearing 7 Remove vanes from the rotor 8 Remove three sets of carbon shoes and three shoe springs two sets of carbon shoes and two shoe springs for the two vane type using a pair of tweezers or needle nose pliers Fig EC 118 Removing carbon shoe 9 In the three vane type air pump if 1t 15 necessary to replace the relief valve use bridge for pulling out relief valve special tool ST19850000 and standard puller Fig EC 119 Remo
120. ving relief valve air pump EC 58 10 further disassembly should be attempted Cleaning inspection lubrication Cleaning Clean the rear bearing and vane hub with bearings solvent Remove carbon dust from pump housing and rotor assembly with compressed air Note Do not use cleaning solvent on pump inner housmg and rotor assembly EMISSION CONTROL SYSTEM Inspection Inspect all parts for chipping Scoring wear or roughness damaged parts must be replaced to ensure quiet and efficient oper ation If especially side carbon seal 15 scored replace with a new one for the three vane type Carbon dust may be present in the housing and 15 usually an indication of normal wear Lubrication The rear bearing and vane hub bearings must be lubricated with a high melting point grease such as ESSO ANDOK 260 or equivalent Grease each bearing to insure adequate lubrication Note Beanngs for service are already packed with high melting point grease Fig EC 120 Components of three valve type air pump Assembly of air pump 1 Place the air pump housing in a vise clamping pump drive hub between jaws 2 Assemble vanes correctly on dummy shaft of 03740 inch dia meter special tool ST19860000 ECO74 Fig EC 121 Vane assembly 3 Place vanes into rotor With the three vane type make sure that one vane is against housing stripper and do not remove the dummy shaft at this time EC 59 Notes a Pack th
121. w guide valve from carburetor air cleaner side it flows to the fuel tank side and or crankcase side 4 Thi opens when the inner pres sure 15 04 inch Hg When operation 15 improper or breakage exists replace 1t 1 Vacuum adjusting screw 2 Lock screw 3 Control valve 4 Connector control valve 6 Servo diaphragm 7 Connector A B valve 8 Auxiliary throttle shaft 13 Opener adjusting screw 9 Vac tube control valve 14 Balance screw 11 Throttle shaft 12 Aur cleaner air horn 5 Vac tube servo diaphragm 10 Throttle adjusting screw 15 Fast idle setting screw 079 Remove the cleaner cover and oil damper cap raise the suction pis ton by finger and make sure that the suction piston can be raised smoothly 2 Check level and add oil MS 20 or 10W 30 if insufficient Fig EC 142 Carburetor linkage Fig EC 143 Checking damper oil level EC 71 au cleaner From fuel tank To crankcase 141 Flou guide ualue SPEED Loosen the balance screw and the first idle setting screw completely Note Make sure front F and rear screw 4 It 1s absolutely necessary to drive the vehicle for more than 20 minutes about 30 mph for warming up Note In this procedure make sure that the HOT COLD valve on the cleaner intake nozzle 1s adjusted in accordance with the season m which the vehicle is driven summer or winter side 5 Connect the engine tachometer and the
122. witch and the current of electricity interconnecting them Fig EC 59 Speed switch Throttle switch On the Datsun 510 and WPLS510 this switch is set on the bell crank of the accelerator linkage and Electric current Carburetor throttle valve Switch 1 Switch 2 EC 32 EMISSION CONTROL SYSTEM Electric current Throttle switch Carburetor throttle valve Switch 2 Open ON ON 6 Wide open ON OFF EC037 Fig EC 61 Operation of throttle suntch of ON and OFF of the throttle switch unit 15 as illustrated below operated by the cam plate connected to the throttle valve shaft The range In the Datsun PL521 this switch 15 set to the body of carburetor and 15 Turning direction Setting place at idle 40 Throttle valve opening angle Throttle valve shaft Cam plate Throttle switch ECO38 Fig EC 62 Operation of throttle PL521 Dual point distributor retarded breaker point The distributor for L16 engine has two breaker points located opposite each other with a phase difference as shown in Figure EC 63 The difference in phase can be adjusted by the adjusting screw phase difference of 7 crank angles 15 adopted Those two breaker points placed parallel in the primary ignition EC 33 works when the relay 15 turned and the advanced breaker point works when the relay is turned OFF EMISSION CONTRO
123. wo seconds It should not be used continu ously c When adjusting in idling cond ition for 1 to 2 minutes or more make sure to race the engine be forehand d When the throttle adjusting Screw is returned during the above adjustment and engine speed can not be reduced below 750 rpm other adjusting screws such as opener adjusting screw 3 and balance screw 4 must have been tightened excessively or the acceler ator linkage must have been ad justed incorrectly Under the nor mal condition the auxiliary throt tle shaft 8 and throttle shaft 11 should have a slight play during engine operation under the idling speed In other words the auxiliary throttle shaft should be pro vided with a play which cor responds to the clearance Ta Tb as shown in Figure EC 149 SU carburetor Front side ECOBi Fig 149 Adjusting idle speed and mixture EC 72 EMISSION CONTROL SYSTEM 8 Then apply a flow meter to the rear side air horn 2 of the air cleaner Do not move the flow adjusting screw of the flow meter If the flow meter float 15 not aligned with the front carburetor scale turn the rear carburetor throttle adjusting screw and align the float with the front carbure tor scale Notes a Do the same with openings of F and R throttle valves b The above throttle valve open mgs are even and the air flow 15 also uniform when the position of the float the glass tube of the
124. ye Barrel Bore Large ventun Small venturi Main jet Mann air bleed Slow jet t in dia 1024 dia 0787 lst im dia 0315 2nd dia 97 140 79 EMISSION CONTROL SYSTEM Item Slow air bleed Power jet Accelerator pump injector 1n dia Injection volume cu in Dumper spring 2 Throttle opening at full choke Dashpot Alternator Make Model Capacity Distributor Make Model Condenser Spark plug Make Model Flow guide valve Make Model LB110ARU LB110TRU KLB110U 45 50 1 3 Electric automatic choke S YN 209 HITACHI LT135 13 D412 80 Taman D412 63 BP SES LA6PW HITACHI FGA 1 Opening pressure in Hg Control valve Make Model Opening depression at sea level in Hg Servo diaphragm Full stroke in Mark means available 4 1 1 e TPA28 I TPA28 3 22210228 21510220 0 1969 80 KLB110AU 1 f t faf t T t 1 t EMISSION CONTROL SYSTEM It LB110TRU KLB110U LBIIOARU KLB110AU em 1700 to 1800 rpm Opening stroke of engine speed on no load Transmission controlled vacuum Vacuum advance advance only in 4th gear Temp sensing switch Above 509 ON

Service Manual Emission Control System 1972 models revised

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