1988 JEEP CHEROKEE oil type
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![JEEP CHEROKEE 1988 Service Repair Manual Conditions (Taxi \
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Or Delivery Type Replace Engine Oil 6,000 Miles or 6 Month](/manual-img/16/57037/w960_57037-959.png "JEEP CHEROKEE 1988 Service Repair Manual Conditions (Taxi \
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Conditions (Taxi \
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Or Delivery Type Replace Engine Oil 6,000 Miles or 6 Months
Service) Filter
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Service Lube Prop 3,000 Miles
Shaft If
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Replace A/T Fluid 12,000 Miles
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Replace Front And/Or 12,000 Miles
Rear Axle Oil
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Replace M/T Fluid Oil 18,000 Miles
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Driving Off-Road Replace Engine Oil 3,000 Miles or 3 Months
Or In Salty Or
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Sandy Areas Replace Engine Oil 6,000 Miles or 6 Months
Filter
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Replace 4WD: Engine 50 Hours
Oil
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Service Lube Prop 3,000 Miles
Shaft If
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Replace A/T Fluid 12,000 Miles
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Replace Front And/Or 12,000 Miles
Rear Axle Oil
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Replace M/T Fluid Oil 18,000 Miles
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Driving In Water Replace Engine Oil 3,000 Miles or 3 Months
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Replace Engine Oil 6,000 Miles or 6 Months
Filter
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Service Lube Prop 3,000 Miles
Shaft If
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Replace A/T Fluid 12,000 Miles
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Replace Front And/Or 12,000 Miles
Rear Axle Oil
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Replace M/T Fluid Oil 18,000 Miles
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Service Lube Prop Daily
Shaft Slip
Splines
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1) - Perform these services at the mileage, hours of operation, or
number of months (since last time), whichever comes first.
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Page 979 of 1378
![JEEP CHEROKEE 1988 Service Repair Manual Choke Linkage
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Choke Linkage
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Ignition Timing
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Lubricate Manifold Heat Control Valve (if equipped)
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Clean PCV Breather (if equipped)
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Clean EGR Passages (if equipped)
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Inspect C/V Joint boots (4WD)
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Inspect Underside of Vehicle (Bolts & Threaded Fasteners)
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Check/Lube Manual Steering Gear
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Check Drive Shaft Seals
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Lubricate Ball Joints, Steering Linkage & Suspension
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Lube Drive Shaft U-Joints and Slip Splines
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Lube Front Axle Drive Joint and Pivot Bearings (4WD)
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Inspect Front Wheel Bearings (4WD)
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Suspension Bushings, Springs, Arms & Rear Jounce Bumpers
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Parking Brake System
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Inspect Shocks for Leakage
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Inspect Tire Wear Pattern
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Rotate Tires and Adjust Air Pressure (Including Spare)
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Replace
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Engine Oil
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Oil Filter
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Spark Plugs
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Ignition Cables
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Distributor Cap and Rotor
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Air Filter Element
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EGR Valve & Tube (1987-92)
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Vacuum Operated Emission Components (1987-92)
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PCV Valve (
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Drive Belt (V-Type) (
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Flush and Fill Engine Coolant, if not done in last 24 months
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Automatic Transmission Fluid, Filter and Adjust Bands
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Accessory Drive Belts
Page 990 of 1378
![JEEP CHEROKEE 1988 Service Repair Manual Lube Parking Brake Ratio Lever Pivot
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Lube Parking Brake Ratio Lever Pivot
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Lube Manual Gearshift Control (4WD Transfer Case)
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Inspect/Repack Front Wheel Bearings (2WD Models)
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Inspect Front Brake Pads & Rotors
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Lubricate Caliper Slide Rails
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Inspect Rear Brake Linings & Drums
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Inspect Brake System Hoses & Lines
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Inspect Shocks for Leakage
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Inspect Tire Wear Pattern
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Lubricate Weatherstripping with Silicone
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Lubricate Door Hinges
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Lubricate Door Locks
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Check Body Drain Holes
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Rotate Tires and Adjust Air Pressure
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Replace
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Engine Oil
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Oil Filter
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Air Filter Element
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Fuel Filter
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Spark Plugs
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Automatic Transmission Fluid, Filter and Adjust Bands
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PCV Filter
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PCV Valve (
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Drive Belt (V-Type) (
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1) - Replacement is recommended by Chrysler at this time, but it
is not required to maintain the warranty on the PCV valve.
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2) - Not required, if belt or PCV Valve was previously replaced
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3) - Check and replace as needed.
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Lubrication Specifications
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Application Specification
Automatic Transmission .......................... Dexron-IIE ATF
Brake Master Cylinder .......... DOT 3 (SAE J-1703F) Brake Fluid
Engine Coolant ........... Alugard 340-2 & Water (50/50 Mixture)
Engine Oil (
1)
Gasoline Engine
Temperature Range
Page 1001 of 1378
![JEEP CHEROKEE 1988 Service Repair Manual Parking Brake System
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Parking Brake System
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Inspect Shocks for Leakage
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Inspect Tire Wear Pattern
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Rotate Tires and Adjust Air Pressure (Including Spare)
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Replace
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Engine Oil
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Oil Filter
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Spark Plugs
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Ignition Cables
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Distributor Cap and Rotor
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Air Filter Element
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Fuel Filter
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PCV Valve (
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PCV Filter
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EGR Valve & Tube (1987-92)
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Vacuum Operated Emission Components (1987-92)
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PCV Valve (
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Drive Belt (V-Type) (
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Flush and Fill Engine Coolant, if not done in last 24 months
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Automatic Transmission Fluid, Filter and Adjust Bands
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(
1) - Replacement is recommended by Chrysler at this time, but it
is not required to maintain the warranty on the PCV valve.
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2) - Check and replace as needed.
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Lubrication Specifications
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Application Specification
Automatic Transmission .......................... Dexron-IIE ATF
Brake Master Cylinder .......... DOT 3 (SAE J-1703F) Brake Fluid
Engine Coolant ........... Alugard 340-2 & Water (50/50 Mixture)
Engine Oil (
1)
Gasoline Engine
Temperature Range
Above 30
F (-1
C) ........ SAE 20W-40 Or 20W-50 API SH/CD
Above 0
F (-18
C) ......... SAE 10W-30 Or 10W-40 API SH/CD
Less Than 60
F (16
C) ............... SAE 5W-30 API SH/CD
Drive Axles ................................ SAE 75W-90 API GL-5
Drive Axles (Trac-Lok) (
2) ................ SAE 80W-140 API GL-5
Drive Axles (Trailer Towing) .............. SAE 80W-140 API GL-5
Hydraulic Clutch ............... DOT 3 (SAE J-1703F) Brake Fluid
Manual Transmission ........................ SAE 75W-90 API GL-5
Parking Brake Cable Guides ................. NLGI Grade 2, GC-LB
Page 1127 of 1378
COIL SPRING
Removal
1) Raise and support vehicle. Remove wheel assembly. Place
reference mark on drive shaft and front axle flange. Disconnect drive
shaft at front axle. Place jack stand under axle housing. Disconnect
lower control arms at axle housing.
2) Disconnect stabilizer bar links and lower shock absorber
mounting bolts at axle housing. Disconnect track bar at the sill
bracket (if equipped). Disconnect center link at pitman arm.
3) Lower axle housing to relieve spring pressure. Remove
spring retainer mounting bolt, then remove retainer and coil spring.
Note component locations for reassembly reference.
NOTE: Coil springs are rated separately for each side of vehicle
depending on optional equipment and type of service. Ensure
springs are marked for installation in original positions.
Installation
1) Install coil spring and spring retainer. Tighten retainer
mounting bolt. Raise axle housing into position. Connect lower
control arms to axle housing.
2) Install lower shock absorber mounting bolts, center
link-to-pitman arm, track bar-to-frame bracket and stabilizer bar
links-to-axle housing. To complete installation, reverse removal
procedure.
LEAF SPRING
Removal & Installation
Raise and support vehicle. Raise axle assembly with jack to
relieve spring tension. On Wrangler models, loosen stabilizer bar
link nut. On all other models, remove stabilizer bar. Remove spring
"U" bolts and plate. Disconnect front and rear shackles from frame.
Lower spring assembly. To install, reverse removal procedure.
UPPER CONTROL ARM &
AXLE HOUSING PIVOT BUSHING
Removal
1) To remove right side upper control arm for 6-cylinder
models, disconnect right side engine mount. Raise and support engine
so rear control arm mounting bolt clears exhaust pipe. On all models,
raise and support vehicle.
2) Remove upper control arm mounting bolt from axle housing.
Disconnect control arm mounting bolt at frame rail. Remove upper
control arm. Repeat procedure for opposite control arm. Inspect
control arm for damage or distortion and replace as needed.
3) Check pivot bushings for excessive distortion,
deterioration or wear. If bushing replacement is necessary, install
Spacer (J-33581-3) between ears of control arm bracket on axle
housing. See Fig. 4.
NOTE: Spacer is not used on axle housings with solid control arm
brackets.
CAUTION: Do not attempt to remove upper control arm pivot bushing
without spacer. Tool is designed to support bracket and
prevent distortion during bushing removal.
4) Install Upper Control Arm Pivot Bushing Remover/Installer
Set (J-35581, which must include Spacer J-35581-3, Remover/Installer
Page 1286 of 1378
![JEEP CHEROKEE 1988 Service Repair Manual \
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Application Champion No.
2.5L ...................................................... RC-12LYC
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SPARK PLUG SPECIFICATIONS \
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Application Gap: In. (mm) Torque: Ft. Lbs. (N.m\
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2.5L .................. .035 (.89) ................... 7-15 (9-20\
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HIGH TENSION WIRE RESISTANCE
Do not puncture spark plug wires with any type of probe.
Remove spark plug wire and check resistance with an ohmmeter.
ADJUSTMENTS
VALVE ARRANGEMENT
* E-I-I-E-E-I-I-E (Front-to-rear).
VALVE CLEARANCE
All models are equipped with hydraulic lifters, which should
be adjusted to zero lash.
IGNITION COIL WIRE
Remove ignition coil wire from coil and distributor cap.
Check terminals for corrosion and clean if necessary. Check coil wire
resistance. Replace wire if resistance is excessive.
HIGH TENSION WIRE RESISTANCE (OHMS)
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Wire Length (In.) Minimum Maximum\
0-15 ........................ 3000 ........................ 10,000
15-25 ....................... 4000 ........................ 15,000
25-35 ....................... 6000 ........................ 20,000
Over 35 ..................... 8000 ........................ 25,000
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DISTRIBUTOR
All models are equipped with a Renix solid state ignition
module. Renix system uses a TDC sensor mounted near the flywheel. The
distributor consists of a cap and rotor. Its only function is to
distribute high voltage to appropriate spark plug. No adjustments are
required on either system.
Page 1310 of 1378
UNIV ER SA L J O IN TS
1988 J e ep C hero ke e
1988 Drive Shafts - Universal Joints
All Manufacturers
MAINTENANCE
Whenever drive shaft is removed from vehicle of if slip yoke
sticks in extension housing seal, clean yoke with solvent. Lubricate
inside diameter of seal with synthetic oil seal lubricant, and outside
diameter of seal with transmission fluid.
OVERHAUL
NOTE: Universal joints should not be disassembled unless external
leakage or damage has occurred.
Before disassembly, scribe alignment marks on yoke and shaft
to allow reassembly in original position. If joints are rusted or
corroded, apply penetrating oil before pressing out bearing cups or
trunnion pin.
CROSS SHAFT & ROLLER TYPE UNIVERSAL JOINTS
There are 2 different retaining methods used for bearing
cups, either snap rings or nylon retainers. Joints with snap rings may
be taken apart and reassembled, using same cross shaft and bearings.
Joints with nylon retainers are disassembled by breaking nylon
retainers. Retainers must be replaced after service.
Removal & Disassembly
1) Disconnect yoke or flange attaching bolts and remove drive
shaft from vehicle.
NOTE: DO NOT use a pry bar to hold drive shaft while loosening
bolts. Damage to bearing seals may result.
Fig. 1: Exploded View of Jeep Constant Velocity Type Universal Joint
2) Remove retaining strap (if equipped). Remove bushing
retainers from yoke. Press out rollers and bearings. Remove last
roller and bushing assembly by pressing on end of cross shaft.
Page 1318 of 1378
the types of injector circuits that your noid lights are designed for.
There are three. They are:
* Systems with a voltage controlled injector driver. Another
way to say it: The noid light is designed for a circuit with
a "high" resistance injector (generally 12 ohms or above).
* Systems with a current controlled injector driver. Another
way to say it: The noid light is designed for a circuit with
a low resistance injector (generally less than 12 ohms)
without an external injector resistor.
* Systems with a voltage controlled injector driver and an
external injector resistor. Another way of saying it: The
noid light is designed for a circuit with a low resistance
injector (generally less than 12 ohms) and an external
injector resistor.
NOTE: Some noid lights can meet both the second and third
categories simultaneously.
If you are not sure which type of circuit your noid light is
designed for, plug it into a known good car and check out the results.
If it flashes normally during cranking, determine the circuit type by
finding out injector resistance and if an external injector resistor
is used. You now know enough to identify the type of injector circuit.
Label the noid light appropriately.
Next time you need to use a noid light for diagnosis,
determine what type of injector circuit you are dealing with and
select the appropriate noid light.
Of course, if you suspect a no-pulse condition you could plug
in any one whose connector fit without fear of misdiagnosis. This is
because it is unimportant if the flashing light is dim or bright. It
is only important that it flashes.
In any cases of doubt regarding the use of a noid light, a
lab scope will overcome all inherent weaknesses.
OVERVIEW OF DVOM
A DVOM is typically used to check injector resistance and
available voltage at the injector. Some techs also use it check
injector on-time either with a built-in feature or by using the
dwell/duty function.
There are situations where the DVOM performs these checks
dependably, and other situations where it can deceive you. It is
important to be aware of these strengths and weaknesses. We will cover
the topics above in the following text.
Checking Injector Resistance
If a short in an injector coil winding is constant, an
ohmmeter will accurately identify the lower resistance. The same is
true with an open winding. Unfortunately, an intermittent short is an
exception. A faulty injector with an intermittent short will show
"good" if the ohmmeter cannot force the short to occur during testing.
Alcohol in fuel typically causes an intermittent short,
happening only when the injector coil is hot and loaded by a current
high enough to jump the air gap between two bare windings or to break
down any oxides that may have formed between them.
When you measure resistance with an ohmmeter, you are only
applying a small current of a few milliamps. This is nowhere near
enough to load the coil sufficiently to detect most problems. As a
result, most resistance checks identify intermittently shorted
injectors as being normal.
There are two methods to get around this limitation. The
first is to purchase an tool that checks injector coil windings under