1988 JEEP CHEROKEE torque

TORQUE SPECIFICATIONS TABLE








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Application Ft. Lbs. (N.m)
Transmission-to-Clutch Housing ..................... 55 (75)
Transmission Cover Bolts ..................... 55-65 (75-88)
Housing-to-Transmission Case ................. 40-45 (54-61)
Crossmember Attaching Bolts .................. 34-40 (46-54)
Filler Plug .................................. 13-15 (18-20)









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with fluid.
LOW-REVERSE (REAR) BAND ADJUSTMENT









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Tighten Screw to Back Off
Application INCH Lbs. (N.m) Screw\
Model 727 ................. 41 (4.6 N.m.) .................... 2 Turns\
Model 904 ................. 41 (4.6 N.m.) .................... 7 Turns\
Model 999 ................. 41 (4.6 N.m.) .................... 4 Turns\









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TRANSMISSION THROTTLE CABLE/LINKAGE
NOTE: A special Idle Speed Actuator (ISA) Exerciser Box Tool is
required to initially set ISA motor and adjust transmission
throttle linkage on vehicles with transmission model 999
with 4-cylinder engines.
727 Transmission with 6-Cylinder Engines
1) Disconnect throttle control rod spring. Use spring to
hold transmission throttle control lever forward, against stop. Block
choke open and release fast idle cam.
2) On carburetors equipped with throttle operated solenoid
valve, turn key to "ON" position to energize solenoid. Open throttle
halfway to allow solenoid to lock. Return throttle to idle position.
3) Loosen retaining bolt on throttle control adjusting link.
DO NOT remove spring clip or nylon washer. Pull on end of link to
eliminate lash. Tighten link retaining bolt. Reconnect throttle
control rod spring.
727 Transmission with V8 engines
1) Disconnect throttle control rod spring. Use spring to
hold transmission throttle valve control lever against forward stop.
Block choke open and release fast idle cam.
2) On carburetors equipped with throttle operated solenoid
valve, turn key to "ON" position to energize solenoid. Open throttle
halfway to allow solenoid to lock. Return throttle to idle position.
3) Loosen retaining bolt on throttle control rod adjusting
link. Remove spring clip and slide nylon washer to rear of link. Push
on end of link to eliminate lash and tighten retaining bolt. Install
nylon washer and spring clip. Reconnect throttle control rod spring.
904 Transmission with 6-Cylinder Engines
1) Remove air cleaner. Hold throttle control lever rearward
against its stop. Block choke plate open and set carburetor linkage
completely off fast idle cam.
2) Unlock throttle control cable by lifting "T" shaped
adjuster clamp with small screwdriver. Move cable outer sheath
forward to remove any cable load on throttle cable bellcrank.
3) Adjust cable by moving cable and sheath rearward until
there is no lash between cable and throttle linkage. Lock cable by
pressing "T" shaped clamp downward until clamp snaps into place.
Install and reconnect any parts removed and/or disconnected.
999 Transmission with 4-Cylinder Engines
1) Raise vehicle. Using a spring, hook one end on throttle
control lever and other end on torque converter housing. Lower
vehicle.
2) Disconnect the ISA motor and connect Exerciser Box to
ISA. Adjustment light should turn off and ready light should turn on.
Press retrack button. Wait until ISA adjusts, ready light goes off
and adjust light goes on.

ENGINES








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High Oil Improper grade of oil Replace with proper oil
Pressure Oil pressure relief valve Eliminate binding
stuck closed
Oil pressure sender or Replace sender or gauge
gauge faulty









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Noisy Main Inadequate oil supply Check oil delivery to
Bearings main bearings
Excessive main bearing Replace main bearings,
clearance See ENGINES
Excessive crankshaft end Replace crankshaft, See
play ENGINES
Loose flywheel or torque Tighten attaching bolts
converter
Loose or damaged vibration Tighten or replace
damper vibration damper
Crankshaft journals Re-grind crankshaft
out-of-round journals
Excessive belt tension Loosen belt tension









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Noisy Connecting Excessive bearing clearance Replace bearing, See
Rods or missing bearing ENGINES
Crankshaft rod journal Re-grind crankshaft
out-of-round journal
Misaligned connecting rod Remove rod or cap and
or cap realign
Incorrectly tightened rod Remove and re-tighten
bolts rod bolts









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Noisy Pistons Excessive piston-to-bore Install larger pistons,
and Rings clearance See ENGINES
Bore tapered or out-of-round Rebore block
Piston ring broken Replace piston rings,
See ENGINES
Piston pin loose or seized Replace piston pin, See
ENGINES
Connecting rods misaligned Realign connecting rods
Ring side clearance too Replace with larger or
loose or tight smaller rings
Carbon build-up on piston Remove carbon









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Noisy Valve Worn or bent push rods Replace push rods, See
Train ENGINES
Worn rocker arms or bridged Replace push rods, See
pivots ENGINES
Dirt or chips in valve Remove lifters and
lifters remove dirt/chips
Excessive valve lifter Replace valve lifters,
leak-down See ENGINES
Valve lifter face worn Replace valve lifters,
See ENGINES
Broken or cocked valve replace or reposition
springs springs
Too much valve stem-to-guide Replace valve guides,
clearance See ENGINES
Valve bent Replace valve, See
ENGINES
Loose rocker arms Retighten rocker arms,
See ENGINES
Excessive valve seat Reface valve seats, See
run-out ENGINES

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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\
)
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.

SPARK PLUGS
SPARK PLUG TYPE TABLE








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Application Champion No.
All Models ....................................... RFN14LY









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SPARK PLUG SPECIFICATIONS TABLE








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Gap: In. (mm) Torque: Ft. Lbs. (N.m)
0.035 (0.89) ................................ 7-15 (10-20)









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FUEL PUMP
4.0L
1) Remove the cap from the pressure test port located in the
fuel rail. See Fig. 1. Connect Fuel Pressure Gauge (J-34730-1) to the
pressure fitting.
2) Start vehicle. Pressure should be approximately 31 psi (2.\
1 kg/cm
) with the vacuum hose connected to the pressure regulator and
39 psi (2.6 kg/cm) with the vacuum hose removed from the pressure
regulator. See FUEL PUMP SPECIFICATIONS TABLE .
3) Check the fuel pump flow rate. A good fuel pump will
deliver at least one liter of fuel per minute with the fuel return
line pinched off. If the fuel pump does not pump adequately, inspect
the fuel system for a plugged fuel filter or filter sock.
4) Fuel pump flow rate can be checked by connecting one end
of an old A/C gauge hose to the fuel test port on the fuel rail and
inserting the other end of the hose into a container of at least one
liter or more capacity.
5) Run the fuel pump by installing a jumper wire into
diagnostic connector terminals D1-5 and D1-6. Be sure to pinch off the
fuel return line or most of the fuel will be returned to the fuel
tank.
Fig. 1: Fuel System Pressure Test Components
Courtesy of American Motors/Jeep Corp.
4.2L
Perform fuel pump test with air cleaner removed and fuel

WHEEL A LIG NM EN T S PEC IF IC ATIO NS & P R O CED URES

1988 J e ep C hero ke e
1988 Wheel Alignment
INTRODUCTION
PRE-ALIGNMENT
VEHICLE CHECKS
Prior to making wheel alignment adjustments, check and
adjust the following items:
1) Tire pressure must be inflated to manufacturers
recommended specifications.Tires should be equal in size and type.
Runout must not be excessive. Tires and wheels should be in balance.
2) Wheel bearings must be properly adjusted. Steering
linkage and suspension must not have excessive wear and/or looseness.
Check for wear in tie rod ends and ball joints.
3) Steering gear box must not have excessive play. Check and
adjust to manufacturer's specifications.
4) Vehicle must be at correct ride height with full fuel
load and spare tire in vehicle. No extra load should be on vehicle.
5) Vehicle must be level with floor and with suspension
settled. Jounce front and rear of vehicle several times and allow it
to settle to normal ride height.
6) Ensure steering wheel spokes are centered with front
wheels in straight-ahead position, correct by shortening one tie rod
adjusting sleeve and lengthening opposite sleeve equal amounts.
7) Ensure wheel lug nuts are tightened to torque
specifications.
DESCRIPTION
CAMBER
Camber is the inward or outward tilt of the wheel as viewed
from front of vehicle. Camber is measured from centerline of vehicle.
When wheel is tilted outward at top from centerline of vehicle,
camber is positive. When wheel is tilted inward at top from
centerline of vehicle, camber is negative. Camber is measured in
degrees from vertical.
Fig. 1: Camber Angle
CASTER
Caster is the tilting of front steering axis. This forward

service adjustment. Vehicle must be level, both crosswise and
lengthwise. Camber should be properly adjusted.
2) If camber cannot be brought within limits and steering
axis inclination is correct, steering knuckle is bent. If camber and
steering axis inclination are both incorrect by approximately the
same amount, upper and lower control arms are bent.
3) Replace parts and recheck all wheel alignment
adjustments. Do not attempt to correct by straightening parts.
Fig. 5: Steering Axis Inclination
TORQUE SPECIFICATIONS
WHEEL LUG NUT TORQUE SPECIFICATIONS TABLE








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Application Ft. Lbs. (N.m)
Grand Wagoneer .................................. 85 (115)
All Other Models ................................ 75 (102)









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