1988 JEEP CHEROKEE drain bolt
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Remove retaining clip and cable self-adjusting clip from blend-air
door lever at bottom of blower housing. Remove cable by squeezing tabs
with needle nose pliers. Do not break housing.
INSTALLATION
To install, connect cable self-adjusting clip to blend-air
door lever, then snap cable into position. Install retaining clip onto
blend-air door lever. Route cable to A/C-heater control panel and
connect. Install control panel.
REMOVAL & INSTALLATION (WRANGLER)
1) Disconnect cables from vent doors. Disconnect cables from
heater control panel levers. Remove cables by squeezing tabs with
needle nose pliers.
2) Connect and adjust cables as described in ADJUSTMENTS
section of this article
HEATER CORE R & I
REMOVAL & INSTALLATION (CHEROKEE & COMANCHE)
1) Disconnect battery ground. Drain cooling system.
Disconnect heater hoses at heater core inlet and outlet tubes.
Disconnect blower motor wires and vent tube. Remove console (if
equipped). Remove lower instrument panel.
2) Disconnect electrical connectors from blower motor
resistors. Disconnect vacuum hose at vacuum motor. Cut plastic
retaining strap holding blower housing to heater core housing.
3) Disconnect and remove heater control cable. Detach clip at
rear of blower housing flange and remove retaining screws. Remove
housing mounting nuts from studs on engine compartment side of dash
panel. Remove right kick panel.
4) Remove instrument panel support bolt. Gently pull on right
side of dash, then rotate housing downward and toward rear of vehicle
to disengage housing studs from dash panel. Remove blower housing.
Detach retaining screws and remove heater core by pulling it straight
out of housing.
5) To install, reverse removal procedure. Ensure seal is
cemented in place to prevent movement when blower assembly is
installed. Connect heater hoses and fill cooling system.
REMOVAL & INSTALLATION (WRANGLER)
1) Disconnect battery ground. Drain about 2 quarts of coolant
from radiator. Disconnect heater hoses at heater core inlet and outlet
tubes. Disconnect vent door cables. Disconnect blower motor wires.
Disconnect defroster duct.
2) Remove nuts attaching heater housing studs to engine
compartment side of dash panel. Remove heater housing assembly by
tilting it downward, to disengage it from defroster duct.
3) Pull heater housing rearward and out from under instrument
panel. Remove heater housing cover from heater housing assembly.
Remove heater core from housing.
HEATER SYSTEM OPREATION CHART & VACUUM DIAGRAM
HEATER SYSTEM OPERATION TABLE \
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Removal
1) Raise and support vehicle. Drain shift housing fluid.
Disconnect vacuum harness. Remove housing bolts. Remove motor and
housing. Mark shift fork and housing for reassembly. See Fig. 3.
2) Rotate shift motor. Remove shift fork and motor snap
rings. Remove shift motor from housing. Remove "O" ring from motor.
Always use a new "O" ring for reassembly.
Installation
Install new "O" ring on motor shaft. Install motor into
housing and slide shift fork onto shaft. Position motor and housing on
axle. Add axle lubricant to shift motor housing. Install shift fork in
shift collar and install housing bolts. Connect all vacuum harnesses
to motor.
Fig. 3: Shift Motor & Housing
Page 930 of 1378
PO W ER S TE ER IN G P U M P
1988 J e ep C hero ke e
1988 STEERING
Jeep Power Steering Pumps - Saginaw Vane-Type
Cherokee, Comanche, Grand Wagoneer, Pickup, Wagoneer,
Wrangler
DESCRIPTION
Saginaw vane-type power steering pump can be identified by
"ham-shaped" fluid reservoir can. Rectangular pumping vanes carried by
a shaft driven rotor move fluid from intake to pressure cavities of
cam ring.
Centrifugal force throws vanes against inside surface of cam
ring to pick up residual oil. As more oil is picked up, it is forced
into cavities of thrust plate, into 2 cross-over holes in cam ring and
pressure plate and into a high pressure area between pressure plate
and housing end plate.
Filling the high pressure area causes oil to flow under vanes
in slots of rotor. This forces vanes to follow inside oval surface of
cam ring. As vanes rotate to small area of cam ring, oil is forced out
from between vanes.
TROUBLE SHOOTING
Refer to TROUBLE SHOOTING - BASIC PROCEDURES article in the
GENERAL TROUBLE SHOOTING section.
LUBRICATION & TESTING
See POWER STEERING GENERAL SERVICING article in the STEERING
section.
REMOVAL & INSTALLATION
POWER STEERING PUMP
Removal & Installation
1) Loosen pump adjusting bolt (or nut) and pump mounting
bolts. Remove pump drive belt. Disconnect pressure and return hoses
from pump. Cap ends to prevent loss of fluid or contamination.
2) Remove pump bracket-to-engine bolts. Remove pump, pulley
and mounting bracket as an assembly. To install, reverse removal
procedure. Bleed system.
OVERHAUL
CAUTION: When clamping pump in vise, be careful not to exert
excessive force on front hub or pump. DO NOT use hammer to
remove pulley.
DISASSEMBLY
1) Drain pump reservoir. Clean exterior of unit. Remove
mounting bracket(s). Using a puller, withdraw pulley from shaft. See
Fig. 1 .
Page 995 of 1378
![JEEP CHEROKEE 1988 Service Repair Manual Clean Battery and Battery Terminals
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Clean Battery and Battery Terminals
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Inspect Brake System
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Check Operation of Horn, Wipers/Washers & All Exterior Lights
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Inspect Condition of Wiper Blades
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Check Headlight Alignment
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Check Seat Belt Webbing and Release Mechanisms
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Check Parking Brake Operation
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Check Shift/Clutch Interlock Operation
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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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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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Flush and Fill Engine Coolant, if not done in last 24 months
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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
Page 1052 of 1378
Fig. 5: Front Bracket Boltsp (Cherokee & Commanche)
STEERING GEAR
Removal
1) Remove collapsible steering column. Raise and support
vehicle. Place drain pan under steering gear assembly. Center steering
gear. Disconnect hydraulic hoses from gear and cap ends. Disconnect
steering linkage from pitman arm. Remove pitman arm from gear.
2) Remove flexible coupling clamp bolt and bolts retaining
steering gear to frame. Disconnect gear from flexible coupling and
remove gear from vehicle. On Jeep CJ7 and Scrambler models, remove
steering gear and mounting bracket as an assembly.
Installation
To install, reverse removal procedure. Fill pump reservoir.
Bleed air from system. See POWER STEERING GENERAL SERVICING article.
Page 1195 of 1378
REMOVAL (60/70 SERIES AND MODEL 81 VEHICLES)
1) Raise and support vehicle. Position a drain pan under
shift motor housing.
2) Disconnect vacuum harness.
3) Remove housing attaching bolts. Remove housing, motor and
shift fork as a unit. See Fig. 3.
4) Mark shift fork and housing for installation reference.
5) Rotate shift motor and remove shift fork and motor
retaining snap rings.
6) Remove shift motor from housing.
7) Remove O-ring seal from shift motor shaft. See Fig. 4.
Discard O-ring seal.
INSTALLATION (60/70 SERIES AND MODEL 81 VEHICLES)
1) Add 5 ounces (148 ml) of SAE 75W-90 grade GL 5 gear
lubricant to axle through shift motor housing opening.
2) Insatll a replacement O-ring seal on shift motor shaft.
See Fig. 4 .
3) Insatll shift motor in housing with retaining snap rings
and slide shift fork onto shaft with reference mark aligned.
4) Engage shift fork with shift collar and install housing
attaching bolts. See Fig. 3. Tighten bolts with 101 inch-lbs. (11 N.m)
torque.
5) Connect vacuum harness to shift motor and lower vehicle.
Fig. 3: Axle Vacuum Shift Motor and Housing
Page 1199 of 1378
Will Not Shift Or Difficult To Shift Into Gear
Vehicle speed too high; slow vehicle to 2-3 MPH to shift.
Vehicle operated too long on dry paved surface; stop vehicle and place
in Reverse or Neutral to relieve driveline torque. Ensure transfer
case external linkage is not binding. Ensure correct fluid is used.
Internal parts may be worn or damaged.
Noisy In All Gears
Check fluid level. Ensure correct fluid is used. If fluid is
okay, locate possible internal mechanical problem.
Jumps Out Of Gear Or Noisy In 4WD
Transfer case not completely in gear; check shift linkage.
Range fork damaged. Shift fork pads are worn or shift fork binding.
Low range gear worn.
Fluid Leaking From Vent Or Seals
Transfer case overfilled. Vent plugged. Output shaft seals
are damaged or not installed properly.
ON-VEHICLE SERVICE
FRONT OIL SEAL
Removal & Installation
1) Mark front drive shaft and flange for installation
alignment reference. Remove front drive shaft. Remove flange. Discard
washer and nut. Using a screwdriver, carefully remove oil seal. Ensure
seal contact surface is clean.
2) Apply ATF to seal lip and flange seal surface. Install NEW
oil seal. Install flange and NEW washer and nut. Tighten nut to
specifications. See TORQUE SPECIFICATIONS . Install front drive shaft
using alignment marks. Check transfer case fluid.
EXTENSION HOUSING OIL SEAL & BUSHING
Removal & Installation
1) Mark rear drive shaft and flange for installation
alignment reference. Remove rear drive shaft. Tap extension housing in
a clockwise direction and remove extension housing. DO NOT pry on
extension housing. Using a screwdriver, remove oil seal from extension
housing.
2) Using bushing driver, replace bushing in extension
housing. Install NEW extension housing oil seal. Apply silicone
sealant to extension housing mating surface. Install extension
housing. To complete installation, reverse removal procedure.
REMOVAL & INSTALLATION
TRANSFER CASE
Removal
1) Shift transfer case into 4H and disconnect battery
negative cable. Raise vehicle, remove skid plate and drain fluid.
2) Mark front and rear output shaft yokes to drive shafts for
reassembly reference. Support transfer case and remove rear
crossmember. Remove drive shafts.
3) Disconnect vehicle speed sensor electrical connector and
vacuum (hoses) harness at transfer case. Remove shift lever or linkage\
rod from case. Remove transfer case attaching bolts. Remove transfer
case from vehicle.
Page 1205 of 1378
![JEEP CHEROKEE 1988 Service Repair Manual TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE \
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TORQUE SPECIFICATIONS TABLE \
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TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE \
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Application Ft. Lbs. (N.m)
Companion Flange Nut
Chrysler Corp. ....................... 130-200 (176-271)
General Motors ................................ 80 (108)
Jeep ......................................... 110 (149)
Detent Plug
General Motors ................................. 11 (15)
Chrysler Corp. & Jeep .......................... 15 (20)
Drain & Fill Plug .......................... 30-40 (41-54)
Extension Housing Bolt ..................... 20-25 (27-34)
Front Bearing Retainer Bolt
Chrysler Corp. & Jeep .......................... 16 (22)
General Motors ................................. 14 (19)
Front Case-to-Rear Case Bolt
Chrysler Corp.
Flange Head Bolt ........................ 35-45 (47-61)
All Other Bolts ........................ 20-25 (27-34)
General Motors ................................. 23 (31)
Jeep ..................................... 20-25 (27-34)
Range Lever Nut ............................ 15-20 (20-27)
Rear Bearing Retainer Bolt ................. 20-25 (27-34)
Rear Crossmember ................................. 30 (41)
Shift Lever Lock Bolt ............................ 10 (14)
Speed Sensor Bolt ................................ 23 (31)
Transfer Case-to-Transmission Nut ................ 26 (35)
Vacuum Switch
Chrysler Corp. ........................... 15-25 (20-34)
General Motors ................................. 17 (23)
Jeep ..................................... 20-25 (27-34)
INCH Lbs.
Control Cable Lock Nut ............................ 18 (2)
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VACUUM DIAGRAMS
For vacuum diagrams, refer to appropriate VACUUM DIAGRAMS
article in the ENGINE PERFORMANCE section.