Induction and Exhaust
Contents
1. AALTIB ph BaO p mossar DAE70 jy 222 MOPAR PEREO I Induction System INTAKE MANIFOLD The 4 0L engine standard production intake manifold is made of cast aluminum and uses eleven bolts to mount to the cylinder head Figure 4 48 This mounting style improves sealing and reduces the chance of leaks Removal and Installation The engine intake manifold and exhaust manifolds must be removed and installed together The manifolds use a common gasket at the cylinder head Refer to Exhaust Manifolds Exhaust System section of this chapter for more information MULTI POINT FUEL INJECTION MPI The 4 0L engine uses a sequential Multi Port Fuel Injection MPI system Fuel is injected into the intake manifold before the intake valve in precise metered amounts through electrically operated injectors The injectors are fired in a specific sequence by the Powertrain Control Module PCM The PCM constantly adjusts the amount of fuel injected to meet changing operating conditions by controlling injector pulse width the length of time the injector is energized The PCM also adjusts ignition timing by controlling the ignition coil operation through the Ignition Control Module ICM The PCM determines air fuel mixture and ignition timing based on inputs it receives from various sensors that monitor engine operating conditions The PCM receives inputs from sensors that react to exhaust gas oxygen content coolant temperatu2. Install the fuel system supply line to the fuel rail assembly Before connecting the fuel supply line to the fuel rai inspect the O rings and replace if necessary Refer to the proper service manual for correct procedure Connect all electrical connections on the intake manifold Connect the vacuum hoses previously removed cable if equipped Install the transmission line pressure cable if equipped Refer to the proper service manual for correct procedure Install air cleaner assembly Connect air inlet hose to the throttle body assembly Raise the vehicle Using a new exhaust manifold seal connect the exhaust pipe to the engine exhaust manifold Tighten the bolts to 31 Nem 23 ft lbs Lower the vehicle Connect the battery negative cable Start the engine and check for leaks INTAKE MANIFOLD An MANIFOLD EXHAUST MANIFOLD EXHAUST Figure 4 48 TE A T EXHAUST SYSTEM MODIFICATIONS Using straight through type mufflers and steel tubing headers on your stock vehicle doesn t mean that you will gain horsepower Today s car and truck exhaust systems are specifically tuned to the engines they come with In other words the best all around dual purpose exhaust set up is the stock set up that came with your vehicle OK you might gain 5 extra horsepower by using a header and a straight through type muffler but the noise level the disturbance in engine back pressure via the exhaust system and the high c
3. Air filter oil TURBOCHARGING Turbocharging is not for the amateur People who want turbochargers on their race vehicles are those looking for an added amount of horsepower to their already well running engines Turbocharging is not a new engineering feature It has been used for many years in many applications Even some production models of the mid 1960s had a turbocharging option However after a year or two in production these options were dropped Over the past several years interest in turbocharging has increased rapidly Much of this interest is centered around the Street Machine Street Rod and recreational vehicle segments of the automotive high performance scene We have been evaluating the turbocharging of Jeep engines for several years We have been primarily interested in gaining experience and knowledge in the area and have left the marketing of kits etc to the aftermarket manufacturers Turbocharging is best suited to small engines with low compression ratios because of the quality of gasoline currently available Turbochargers can add a lot of power to an engine without having to change engine displacement swap engines or disassemble the engine Most aftermarket systems just bolt right on Jeep engines are particularly well suited to turbocharging because of their heavy duty construction and reliability Choosing a turbochargercan be a complicated task which is beyond the scope of this discussion For details
4. Ay oitrar ax h aaO h Movar D8470 fr SHEE emi OOo mmama aa amaa anaman aaa aaa a anaa Eara aa e eaa EEEE a 1 P a 224 MOPAR PERFORMANCE PART INJ 1 INJ 2 INJ 3 INJ 4 INJ 5 INJ 6 FITTING MOUNTING BOLTS 4 FUEL BXJECTOR PRESSURE TEST PORT CAP Figure 4 47 Fuel Pressure Regulator The fuel pressure regulator used with the MPI fuel system is a vacuum assisted non adjustable type The regulator is mounted on the output end of the fuel rail and is connected to intake manifold vacuum The regulator is calibrated to maintain fuel system pressure at approximately 214 kPa 31 psi with vacuum applied while the engine is at idle Fuel pressure will be 55 69 kPa 8 10 psi higher if vacuum is not applied to the regulator The pressure regulator contains a diaphragm calibrated spring and fuel return valve Fuel pressure operates on the bottom side of the diaphragm while spring pressure and intake manifold vacuum operate on the top side of the diaphragm Spring pressure tries to force the return valve closed Fuel pressure with assistance from manifold vacuum on the spring side acts against the spring pressure to open the return valve Thus system fuel pressure is the amount of fuel pressure required to force against spring pressure and unseat the fuel return valve Without vacuum applied to the spring side of the regulator the spring is calibrated to open the fuel return outlet when the pressure differ
5. OE SOIR ON e a N ee Ne Re Seek eee SRO NNO On IER RLS Gee Gn RT a 4 0L POWER TECH IN LINE 6 EXHAUST SYSTEM 237 LL Exhaust Collector and Feeder Gaskets These exhaust collector and feeder gaskets are made from special extra high temperature material for added strength and durability For use with Mopar Performance Parts headers P487635 1 Exhaust collector gasket 2 1 2 3 bolt P4876352 Exhaust collector gasket 3 3 bolt P4876353 EGR feeder gasket 1995 and prior models SSS SEES EAE eee Mufflers Cat Back Performance Exhaust Our Mopar Performance Parts cat back exhaust systems are specifically engineered to fit your vehicle no modifications are required These kits simply bolt into the OE hangers and brackets Features include heavy wall 16 gauge aluminized tubing with true mandrel bends allowing for maximum flow and minimum back pressure A low restriction aluminized case flow through muffler with a3 core produces a deep mellow exhaust tone No fiberglass packing to bum out Kits include all necessary installation hardware For 4 0L engines only P5249739 Cat Back performance exhaust 1993 95 Wrangler P4876277 Cat Back performance exhaust 1997 98 Wrangler P4876359 Cat Back performance exhaust 1986 96 Cherokee P4876089 Cat Back performance exhaust 1997 98 Cherokee P4876627 Cat Back performance exhaust 1993 98 Grand Cherokee ee Note For maximum performance this system should be used in
6. PCM The Powertrain Control Module PCM is a digital microprocessor Air fuel mixture calibrations for various driving and atmospheric conditions are pre programmed into the PCM The PCM monitors and analyzes its various inputs computes engine fuel and ignition timing requirements based on these inputs and controls fuel delivery and ignition timing accordingly As operating conditions change the PCM adjusts injector pulse width and ignition timing for optimum performance and fuel economy an rc ara eea me e ee ES Jeep High Performance Computer Mopar Performance Parts computer provides more spark advance and increased fuel flow for off road racing applications This computer will enhance other performance modifications For 1987 90 4 0L engines only P4529334 Jeep high performance computer PCM Inputs The PCM is powered by the vehicle s battery When the ignition is turned to the ON or START position the following inputs are supplied to the PCM e Battery Voltage e Manifold Absolute Pressure MAP Sensor e Coolant Temperature Sensor E E oa Se i e a 4 0L POWER TECH IN LINE 6 INDUCTIONSYSTEM 223 e Manifold Air Temperature MAT Sensor o Exhaust Oxygen O Sensor Engine Speedcrankshaft Position Sensor e Throttle Position Sensor e Injector Synchronization Signal e A C Select Signal e Neutral Safety Switch gear selection automatic transmission e Knock Sensor e Start Signal PCM Outputs Ba
7. we suggest that you contact the various turbo manufacturers In general small engines should use small turbochargers Also small turbochargers are best suited for general purpose use The larger turbochargers are designed for high engine speeds and high outputs which make them best suited for actual racing applications The boost pressure from the turbocharger for a general purpose application would be in the 5 to 10psi range For boost pressures over 10 psi and or higher compression ratios over 8 0 1 water and or alcohol injection is needed For general purpose use a conservative camshaft is an advantage because it improves low speed response Also for general purpose use water injection is not recommended because if the water is allowed to run out excessive detonation and engine failure would quickly result En re PD dT E ET T ie ane In a turbocharging application the most likely parts to fail in an engine are the pistons and or rings which will fail from detonation Therefore low compression ratios and lower boost pressures are recommended for general purpose use and water injection should be used in racing applications For general purpose turbocharger applications a spark advance retard system sensitive to positive manifold pressure should be added to the distributor Some general tips on turbocharging are as follows A wastegate increases the engine s performance especially at lower engine speeds A turbocharger uni
8. all sensors even in high performance racing set ups These sensors constantly input vital information to the PCM and the PCM corrects the mixture accordingly And don t abandon that oxygen sensor either Since racing set ups don t use catalytic converters use an EGT probe to locate the hottest spot in the exhaust system and install the oxygen sensor there AIR FILTERS High Performance Air Filter Element Special reusable filter element for high performance Increases air flow versus stock filters which increases engine output P5249792 High performance air filter element 1993 97 Jeep Grand Cherokee 4 0L only P5249918 High performance air filter element 1991 96 Jeep Wrangler 4 0L only P4876273 High performance air filter element 1997 98 Jeep Wrangler 4 0L only P4876272 High performance air filter element 1987 96Jeep Cherokee 4 0L only Air Filter Cleaning Fluid Mopar Performance Parts long life high performance air filters are reusable This cleaning fluid is designed to remove dirt to extend the life of the filter P4529392 Air filter cleaning fluid POSEE oe ees EEA E aea a et T TTT ARSE 3 f l 4 0L POWER TECH IN LINE6 INDUCTIONSYSTEM 225 See 5 i ae et DA eM ye eee he a MEN kt RL EMD iene es a a ian a Air Filter Oil Long life high performance air filters trap dirt with a special oil on the filter After cleaning air filters re oil them with this special fluid P4529393
9. conjunction with Mopar Performance headers Se SS SE PE E EE EEEE ETE A otar2e Los statics ad 1 LAF QE il rr orr
10. ed with an exhaust gas recirculation EGR system The use of gas to dilute incoming air fuel mixtures lowers peak flame temperature during combustion thus limiting the formation of NO Exhaust gases are taken from openings in the exhaust gas Crossover passage in the intake manifold Refer to the Service manual for complete description diagnosis and Proper service procedures POSSIBLE CAUSE CORRECTION 1 Leaks at pipe joints 2 Burned or blown out muffler 3 Burned or rusted out exhaust 4 Exhaust pipe leaking at manifold 5 Exhaust manifold cracked or 6 Leak between exhaust manifold and cylinder head 7 Restriction in muffler or tailpipe 8 Exhaust system contacting body 1 Leaks at pipe joints 2 Damaged or improperly installed 2 Replace gaskets as necessary Tn ae TT 1 Tighten clamps at leaking joints 2 Replace muffler assembly Check exhaust system 3 Replace exhaust pipe 4 Tighten connection attaching nuts 5 Replace exhaust manifold 6 Tighten exhaust manifold to cylinder head stud nuts or bolts 7 Remove restriction if possible Replace muffler or tailpipe as necessary 8 Re align exhaust system to clear surrounding components 1 Tighten replace clamps at leaking joints EXHAUST AND INTAKE MANIFOLDS The two exhaust manifolds are log style and are made of high silicon molybdenum cast iron The exhaust man
11. ential between the fuel injectors and the intake manifold reaches approximately 269 kPa 39 psi Since manifold vacuum varies with engine operating conditions the amount of vacuum applied to the spring side of the diaphragm varies For this reason fuel pressure varies depending upon intake manifold vacuum With low vacuum such as during wide open throttle conditions minimal vacuum assistance is available and full spring Sn pressure is exerted to seal the fuel outlet causing system pressure to increase With high vacuum such as during idle fuel pressure on the bottom of the diaphragmis assisted by intake manifold pressure on the spring side of the diaphragm resulting in lower system fuel pressure The fuel pressure regulator is not controlled by the PCM Racing Modifications By their nature unlike carbureted engine set ups fuel injection systems deliver fuel equally among all six cylinders It s because of this excellent fuel distribution characteristic that fuel injection is preferred over carburetors even over high performance 2 and 4 Bbl carburetors And don t disconnect those stock fuel injection sensors Today s engines run a lot hotter because they run a lot leaner because of this fuel injection temperature is very critical It is something that has to be constantly monitored and stabilized to keep the fuel injection and the power level in their proper places Mopar Performance Parts recommends the use of
12. he catalyst core DO NOT allow engine to operate above 1 200 rpm in neutral for extended periods over 5 minutes This condition may result in excessive exhaust system floor pan temperatures because of no air movement under the vehicle m T amp S STS S w TIT T aT 4 0L POWER TECH IN LINE 6 EXHAUST SYSTEM 235 CONDITION EXCESSIVE EXHAUST NOISE Jipe flange broken or chassis EAKING EXHAUST GASES gaskets Heat Shields Heat shields are needed to protect both the vehicle and the environment from the high temperatures developed in the vicinity of the catalytic converter The combustion reaction facilitated by the catalyst releases additional heat in the exhaust system Under severe operating conditions the temperature increases in the area of the reactor Such conditions can exist when the engine misfires or otherwise does not operate at peak efficiency DO NOT remove spark plug wires from plugs or by any other means short out cylinders Failure of the catalytic converter can occur due to a temperature increase caused by unburned fuel passing through the converter DO NOT allow the engine to operate at fast idle for extended periods over five minutes This condition may result in excessive temperatures in the exhaust system and on the floor pan Exhaust Gas Recirculation EGR To assist in the control of oxides of nitrogen NOX in engine exhaust all engines are equipp
13. ifolds share a common gasket with the intake manifold The exhaust manifolds also incorporate ball flange outlets for improved sealing and strain free connections Removal Note The engine intake and exhaust manifold must be removed and installed together The manifolds use a common gasket at the cylinder head 1 Disconnect the battery negative cable 2 Remove air cleaner inlet hose from throttle body assembly 3 Remove the air cleaner assembly 4 Remove the throttle cable vehicle speed control cable if equipped and the transmission line pressure cable if equipped 5 Disconnect the following electrical connections and secure their harness out of the way e Throttle Position Sensor e Idle Air Control Motor lll Dewariow 1 Af lar2ZzEe Sau A 4 OLtrae rT mr 304570 236 MOPAR PERFORMANCE PARTS a Sh o Coolant Temperature Sensor at thermostat housing o Intake Air Temperature Sensor e Oxygen 02 Sensor e Crank Position Sensor e Six 6 Fuel Injector Connectors 6 Disconnect the MAP sensor HVAC and brake booster vacuum supply hoses at the intake manifold 7 Perform the fuel pressure release procedure Refer to the proper service manual for correct procedure 8 Disconnect and remove the fuel system supply line from the fuel rail assembly Refer to the proper service manual for correct procedure 9 Loosen the accessory drive belt and tensioner Refer to the proper ser
14. ler catalytic converter If damaged the converter must be replaced The stainless steel catalytic converter body is designed to last the life of the vehicle Excessive heat can result in bulging or other distortion but excessive heat will not be the fault of the converter A fuel system air injection system or ignition system malfunction that permits unburned fuel to enter the converter will usually cause overheating If a converter is heat damaged correct the cause of the damage at the same time the converter is replaced Also inspect all other components of the exhaust system for heat damage Caution Due to exterior physical similarities of some catalytic converters with pipe assemblies extreme care should be taken when selecting replacement parts For availability and pricing contact your local Chrysler Plymouth Dodge Jeep dealer The combustion reaction caused by the catalyst releases additional heat in the exhaust system causing temperature increases in the area of the reactor under severe operating conditions Such conditions can exist when the engine misfires or otherwise does not operate at peak efficiency DO NOT remove spark plug wires from plugs or by any other means short out cylinders if exhaust system is equipped with a catalytic converter Failure of the catalytic converter can occur due to temperature increases caused by unburned fuel passing through the converter Unleaded gasoline MUST be used to avoid poisoning t
15. ost of these performance parts do not justify making these modifications However if the vehicle is to be raced and the modifications to that vehicle include a high performance camshaft and valve train set up then a header and straight through type muffler can be very beneficial and the cost justified Note All exhaust systems should be checked for leaks A leak in the exhaust system is unsafe and will cause you to lose power Headers Steel tubing headers are a very popular exhaust system modification When shopping for headers the most important thing to remember is to match the headers to both the engine AND the vehicle This will save you a lot of time when installing the headers Mopar Performance Parts Exhaust Headers Bolt on a set of our Mopar Performance Parts headers and feel the power Manufactured from heavy 14 gauge tubing with 3 8 thick flanges mandrel bent and triple nickel chrome finish makes these headers the most durable on the market Each header is engineered to achieve minimum back pressure and maximum flow resulting in increased horsepower and torque Headers carry a lifetime warranty and are emissions exempt Kits include all necessary installation hardware For 4 0L engines only Vehicle application as listed P5249972 Wrangler 1995 P4876260 Wrangler 1997 98 P4529530 Wrangler all stainless steel P48769 18 Cherokee 1986 91 P524997 1 Cherokee and Grand Cherokee 1996 98 be 5 ES
16. ources The various engine builders and suppliers in the supercharging area are very important people to keep in touch with to be able to keep up to date Their addresses are listZed below Keith Black Racing Engines 11120 Scott Avenue South Gate California 90280 Milodon Engineering Co 207 16 Plummer Street Chatsworth California 91311 B amp M 9142 Independence Avenue Chatsworth California 91311 www bmracing com Crane Cams 530 Fentress Boulevard Daytona Beach Florida 32114 www cranecams com Ga ewy 234 MOPAR PERFORMANCE PARTS Exhaust System INTRODUCTION The basic exhaust system consists of an exhaust manifold exhaust pipe with oxygen sensor catalytic converter heat shield s muffler and tailpipe The 4 0L engine uses a seal between the exhaust manifold and exhaust pipe to assure a tight seal and strain free connection a single muffler and a single monolithic type catalytic converter The exhaust system must be properly aligned to prevent stress leakage and body contact If the system contacts any body panel it may amplify objectionable noises originating from the engine or body When inspecting an exhaust system critical items to look for are cracked or loose joints stripped screw or bolt threads corrosion damage and worn cracked or broken hangers Replace all components that are badly corroded or damaged DO NOT attempt to repair When replacement is required use original eq
17. peration e Ignition Switch ON e Engine Start Up Crank e Engine Warm up e Idle e Cruise e Deceleration e Wide Open Throttle e Ignition Switch OFF The ignition switch ON engine start up crank engine warm up deceleration and wide open throttle modes are OPEN LOOP modes The idle and cruise modes with the engine at operating temperature are CLOSED LOOP modes Throttle Body Filtered air from the air cleaner enters the intake manifold through the throttle body Fuel does not enter the intake manifold through the throttle body Fuel is sprayed into the manifold by the fuel injectors This throttle body mounted on the intake manifold contains an air bypass passage that is used to supply air for idle conditions and a throttle valve for above idle conditions The throttle position sensor and idle speed stepper motor are attached to the throttle body The accelerator cable is connected to the throttle valve through a bellcrank and linkage mounted to the intake manifold There are differentthrottle bodies for automatic and manual transmission equipped vehicles The throttle valve is not controlled by the PCM Fuel Rail The fuel rail supplies fuel to the injectors and is mounted to the intake manifold Figure 4 47 The fuel pressure regulator is attached to the rail and the fuel pressure test port is integral with the rail The fuel rail is not repairable mo e aN 44 0 Jate r J phase Af tar2Ze
18. performance purposes There are two general types of 6 71 blowers for high performance applications Gas Fuel pro racing and dual purpose These two look the same externally but are different internally and use a different drive arrangement We ll leave the Gas Fuel racing blowers to the pros They are much more expensive Dual purpose 6 71 blowers bolt to a specially modified intake manifold usually based on a carbureted intake for the specific engine In some cases it is a unique casting Th 4Y 0 a7TRE 3 a tir2g a 1 OLtFOR DAT a h 226 MOPAR PERFORMANCE PARTS Once you have the special intake manifold the blower can be bolted on to your engine After the carburetor or fuel injection is added to the top of the blower a hole is cut in the hood fuel lines and throttle linkage added and everything is done except for the blower drive which is added to the front of the engine The adaptation of the blower to the intake for your specific engine and the blower drive itself are best left to the dual purpose blower specialists that make the kits Note Due to the increased air flow supercharging an engine requires a large increase in fuel delivery Production fuel injection systems are not capable of meeting this fuel demand To supercharge an engine which has production fuel injection the injection system must be substantially modified or else removed and a carburetion system installed Ay S
19. re manifold absolute pressure engine speed crankshaft position throttle position battery voltage intake manifold air temperature engine knock and transmission gear selection These inputs represent the engine s instantaneous operating conditions Air fuel mixture and ignition timing calibrations for various driving and atmospheric conditions are pre programmed into the PCM The PCM monitors and analyzes its various inputs computes engine fuel and ignition timing requirements based on these inputs and controls fuel delivery and ignition timing accordingly The Engine Control System is comprised of 1 the sensors and switches that provide input to the PCM 2 the PCM itself and 3 the PCM outputs engine control devices that the PCM constantly adjusts The Engine Control System consists of Battery Voltage e Manifold Absolute Pressure MAP Sensor e Coolant Temperature Sensor e Manifold Air Temperature MAT Sensor Exhaust Oxygen O Sensor on mee Ul GR TT 1 o Engine Speedcrankshaft Position Sensor o Throttle Position Sensor o Injector Synchronization Signal o AJC Select Signal o 6A C Request Signal o Neutral Safety Switch o Knock Sensor o Fuel Pump Relay o Fuel Injectors o Idle Speed Stepper Motor o B Latch Relay o Oxygen Sensor Heater Relay o EGR Valve Solenoid o Ignition Control Module e Shift Indicator Light manual transmissions only e A C Clutch Relay Powertrain Control Module
20. sed upon signals from various input sensors and switches the PCM adjusts the following components PCM outputs e Fuel Pump Relay e B Latch Relay e Oxygen Sensor Heater Relay e A C Clutch Relay e Fuel Injectors e Idle Speed Stepper Motor e EGR Valve Solenoid e Ignition Control Module ICM e Shift Indicator Light manual transmission only Modes of Operation As input signals to the PCM change the PCM adjusts its response to the output devices For example the PCM must calculate a different injector pulse width and ignition timing for idle than it does for wide open throttle There are eight different modes of operation that determine how the PCM responds to the various input signals Modes of operation are of two different types OPEN LOOP and CLOSED LOOP During OPEN LOOP modes the PCM receives input signals and responds only according to preset PCM Programming Input from the oxygen O sensor is not monitored during OPEN LOOP modes During CLOSED LOOP modes the PCM does monitor the O sensor input This input indicates to the PCM whether or hot the calculated injector pulse width results in the ideal air fuel ratio 14 7 parts air to 1 part fuel By monitoring the exhaust oxygen content through the O sensor the PCM can fine tune the injector pulse width to achieve optimum fuel economy combined with low emission engine Performance Mc TP De aT TT Ls o o The MPI system has the following modes of o
21. t needs to be oiled from the engine It should also have a much larger oil return line to the sump than the line that is used to supply the oil to the turbo under pressure If you have further questions on turbocharging we suggest that you contact the manufacturer of the turbocharging system you are interested in SUPERCHARGING Supercharging is not for the amateur People who want superchargers on their race vehicles are those looking for an added amount of horsepower to their already well running engines There are many types of superchargers on the market There are roots blowers and centrifugal blowers There are names like Paxton Latham Judson B amp M Weiand and many others But to most racers and performance enthusiasts the blower that they want on either their race or dual purpose vehicle is a 6 71 It is a roots blower but it s better known as the blower the pros have used in Top Fuel and Funny Car racing dating back to the late 1960s The 6 71 roots blower makes power and torque by putting a positive pressure in the intake manifold In a typical dual purpose application this pressure is in the 5 to 7 psi range 6 71 blowers were designed and built originally for diesel engines They have never been standard production on any gasoline engine However they have become very popular additions for Street Machines and Street Rods These automotive units are remanufactured and or specially built for racing high
22. uipment parts or their equivalent This will assure proper alignment and provide acceptable exhaust noise levels All exhaust systems should be checked for leaks A leak in the exhaust system is unsafe and will cost you power DO NOT under any circumstances use flexible tubing anywhere in the exhaust system as the efficiency of the flow will be reduced Caution Avoid application of rust prevention compounds or undercoating materials to exhaust system floor pan heat shields Application of coating will result in excessive floor pan temperatures and objectionable fumes Light overspray near the edges is permitted intake Exhaust Manifold Gasket The 4 0L engine uses a common intake and exhaust manifold gasket This gasket is designed for original replacement For 4 0L engine only P4529243 Intake Exhaust manifold gasket Intake Exhaust Manifold Race Gasket Made from special high temperature material for added durability in racing Can be used as a service replacement 4 0L engine only P4876 112 Intake Exhaust manifold race gasket 4 Intake Exhaust Manifold Attaching Package Package of factory original nuts and bolts to attach intake and exhaust manifolds Includes 15 bolts 12 washers two studs two spacers two pins and one tube For 1986 89 4 0L engines only P4529680 Intake Exhaust manifold attaching package Catalytic Converter There is no regularly scheduled maintenance on any DaimlerChrys
23. vice manual for correct procedure 10 Remove the power steering pump and bracket from the eae intake manifold and set aside x 11 Raise the vehicle 12 Disconnect the exhaust pipe from the engine exhaust manifold Discard the seal 13 Lower the vehicle 14 Remove the intake manifold and engine exhaust manifold i Installation 1 If the manifold is being replaced ensure all fittings etc are transferred to the replacement manifold Install a new engine exhaust intake manifold gasket over the alignment dowels on the cylinder head Position the engine exhaust manifold to the cylinder head Install fastener Number 3 and finger tighten at this time Figure 4 48 Install intake manifold on the cylinder head dowels Install washer and fastener Numbers 1 2 4 5 8 9 10 and 11 Figure 4 48 Install washer and fastener Numbers 6 and 7 Figure 4 48 Tighten the fasteners in sequence and to the specified torque Figure 4 48 e Fastener Numbers 1 through 5 Tighten to 33 Nem 24 ft lbs torque e Fastener Numbers 6 and 7 Tighten to 31 Nem 23 ft lbs torque e Fastener Numbers 8 through 11 Tighten to 33 Nem 23 ft lbs torque Ta 10 Install the throttle cable and vehicle speed control 12 13 14 15 16 17 18 19 Install the power steering pump and bracket to the intake manifold Tighten the belt to specification Refer to the proper service manual for correct procedure
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