1988 JEEP CHEROKEE wheel torque
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REMOVAL
1) Raise and support vehicle. Remove wheels, hubs and axles.
See REAR HUB, BEARINGS AND AXLE SHAFTS.
2) Remove lower shock mounts and stabilizer bar mount.
Disconnect drive shaft and tie up. Remove hydraulic brake line at
junction and plug.
3) Disconnect park brake cables and hydraulic brake lines to
wheel cylinders or calipers. Remove brake backing plate or caliper.
4) Support axle housing with floor jack and remove leaf
spring "U" bolts. Carefully lower axle housing and remove from
vehicle.
INSTALLATION
Place axle housing on floor jack. Raise axle and install "U"
bolts and nuts. To complete installation, reverse removal procedure.
Tighten all bolts and nuts to specification. See TORQUE SPECIFICATIONS
table at the end of this article and REAR HUB BEARING ADJUSTING
SPECIFICATIONS table.
PINION SEAL & YOKE R & I
REMOVAL
1) Raise and support vehicle. Mark drive shaft-to-yoke
contact area for reassembly reference. Remove drive shaft-to-yoke
attaching nuts/strap bolts. Discard used strap bolts. Remove drive
shaft.
2) Using a breaker bar and Pinion Nut Remover (8614-01),
remove pinion nut and washer. See Fig. 3. Using Yoke Pullers (8614-
01), (8614-02) and (8614-03), remove yoke. See Fig. 4. Using Pinion
Seal Remover (J-9233 or J-7583), remove pinion seal from front
differential housing. See Fig. 5.
Fig. 3: Removing Pinion Nut & Washer
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closer to pinion gear. If backlash is too low, move ring gear away
from pinion gear.
3) To change backlash readings, move shims from one side of
differential case to other. When backlash adjustment is completed,
check tooth contact pattern. See GEAR TOOTH CONTACT PATTERNS in this
section. Pattern should be correct if assembly and adjustments have
been done properly.
4) When differential is complete and correctly adjusted,
install new cover gasket and cover. Tighten cover bolts to 30-40 ft.
lbs. (41-54 N.m). Fill assembly with hypoid lubricant.
AXLE ASSEMBLY SPECIFICATIONS TABLE
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Application Specifications In. (mm)
Pinion Gear Depth (Nominal Dimension)
Model 44 ................................. 2.625 (66.68)
Model 60 & 61 ............................ 3.125 (79.38)
Model 70 & 80 ............................ 3.500 (88.90)
Ring Gear Backlash ................... .004-.009 (.10-.23)
Side Bearing Preload .......................... .015 (.38)
INCH lbs. (N.m)
Pinion Bearing Preload
New Bearings ........................... 20-40 (2.3-4.5)
Used Bearings .......................... 10-20 (1.1-2.3)
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TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE \
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Applications Ft. Lbs. (N.m)
Axle Flange-to-Hub Bolt
Model 44 ...................................... 35 (48)
Models 60 & 61 ................................ 55 (75)
Model 70 & 80 ................................ 85 (115)
Pinion Shaft Flange Nut
Models 44 & 70 .............................. 210 (285)
Models 60 & 61 .............................. 270 (367)
Model 80 ............................ 440-500 (597-678)
Ring Gear-to-Case Bolt
Model 44 ...................................... 55 (75)
Models 60, 61, & 70 ......................... 110 (149)
Model 80 ............................ 145-165 (196-223)
Side Bearing Cap Bolt ........................... 80 (108)
Front Axle
Cherokee, Comanche, & Wagoneer
Axle Shaft Nut ............................. 175 (237)
Disconnect Housing Bolt ...................... 10 (14)
Hub-to-Knuckle Bolt ......................... 75 (102)
Lower Control Arm Bolt ..................... 133 (180)
Lower Shock Mount Bolt ....................... 14 (19)
Drive Shaft Bolt ............................. 14 (19)
Stabilizer Bar Link Bolt ..................... 70 (95)
Tie Rod Nut ............................ 25-45 (34-61)
Upper Control Arm Bolt ....................... 37 (50)
Wheel Lug Nut ............................... 75 (102)
Grand Wagoneer
Leaf Spring "U" Bolt Nut ................... 100 (136)
Lower Shock Mount Bolt ....................... 45 (61)
Page 394 of 1378
lubricant to axle flange bearing bore and install axle.
YOKE & PINION OIL SEAL
Removal
1) Raise and support vehicle. Remove wheels and brake drums.
Mark and remove drive shaft. Using an INCH lb. torque wrench, record
torque required to rotate pinion several revolutions.
2) Hold yoke from turning and remove pinion nut. Mark drive
pinion shaft and yoke for reassembly reference. Remove yoke and pinion
oil seal.
Installation
1) Coat new seal with rear axle lubricant and install. Align
marks made at disassembly and install yoke. Install new pinion nut and
tighten just enough to remove end play.
CAUTION: DO NOT overtighten pinion nut. If desired preload is
exceeded, a new collapsible pinion spacer sleeve must be
installed and drive pinion preload reset.
2) Using an INCH lb. torque wrench, check torque required to
turn pinion. Refer to torque reading recorded during disassembly and
add 5 INCH lbs. (.6 N.m) for correct preload. Tighten pinion nut
slightly and recheck preload. Repeat procedure until desired preload
is obtained.
REAR AXLE ASSEMBLY
Removal
1) Raise and support vehicle. Remove wheels and brake drums.
Disconnect brake hose-to-axle connection and plug line.
2) Disconnect parking brake cable at brake equalizer. Mark
and remove drive shaft. Disconnect track bar at axle bracket (if
equipped). Remove axle vent tube at axle. Support axle assembly.
Remove spring "U" bolts and tie plates.
3) Loosen, but do not remove, bolts which attach front of
rear spring to frame brackets. Lift axle to relieve axle weight from
springs and remove bolts retaining springs to shackles. Lower springs
to floor. Lower jack and remove axle assembly.
NOTE: Factory axles are shipped without lubricant. When adding
lubricant, position axle horizontally with yoke end of
pinion housing facing downward. Turn pinion shaft several
times to lubricate bearings.
Installation
1) To install, support axle assembly with jack and slide axle
into place. Raise, align and install spring-to-frame and shackle
bolts. Tighten spring-to-frame and shackle bolts to 111 ft. lbs. (150
N.m). Install brake hose, axle vent tube and parking brake cable.
Align and connect drive shaft.
2) Bleed hydraulic system and adjust parking brake cable.
Ensure axle is filled with 75-90W gear lubricant. Ensure spring
centering bolt heads are seated in axle spring seat before tightening
"U" bolts.
OVERHAUL
DISASSEMBLY
NOTE: It is not necessary to remove axle assembly from vehicle to
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![JEEP CHEROKEE 1988 Service Repair Manual AXLE ASSEMBLY SPECIFICATIONS TABLE \
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Application](/manual-img/16/57037/w960_57037-400.png "JEEP CHEROKEE 1988 Service Repair Manual AXLE ASSEMBLY SPECIFICATIONS TABLE \
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AXLE ASSEMBLY SPECIFICATIONS TABLE \
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Application Specification
Axle Shaft End Play ........................ .004-.008" (.10-.20 mm)\
Differential Bearing Preload ........................ .008" (.20 mm)\
Differential Case Face Runout ....................... .002" (.05 mm)\
Differential Side Gear Case Clearance ........... 0-.007" (0-.18 mm)\
Oil Capacity
Standard Drive Axle .............................. 2.5 pts. (1.2L)\
Heavy Duty Drive Axle ............................. 4.7 pts (2.2L)\
Pinion Bearing Preload ................... 15-25 INCH lbs. (2.3 N.m)\
Pinion Gear Depth (Standard)
Standard Drive Axle ............................ 2.095" (53.21 mm)\
Heavy Duty Drive Axle ........................... 2.547" (64.7 mm)\
Ring Gear
Backlash ................................. .005-.009" (.13-.23 mm)\
Preferred ......................................... .008" (.20 mm)\
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TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE \
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Application Ft. Lbs. (N.m)
Axle Housing Cover ......................................... 14 (19)\
Axle-to-Leaf Spring "U" Bolts .............................. 52 (70)\
Brake Support Plate Bolts .................................. 32 (43)\
Differential Bearing Bolts
Standard Drive Axle ...................................... 57 (77)\
Heavy Duty Drive Axle ................................... 85 (115)\
Rear Axle Filler Plug
Standard Drive Axle ...................................... 25 (34)\
Heavy Duty Drive Axle .................................... 15 (20)\
Rear Spring Front Bolt ................................... 111 (150)\
Rear Spring Rear Shackle Nuts ............................ 111 (150)\
Ring Gear Bolts
Standard Drive Axle ............................... 70-90 (95-122)\
Heavy Duty Drive Axle .................................. 105 (142)\
Shock Absorber-to-Axle Nut ................................. 44 (60)\
Universal Joint Clamp Strap Bolts .......................... 14 (19)\
Wheel Lug Nuts ............................................ 75 (102)\
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PINION DEPTH SHIM ADJUSTMENT SPECIFICATIONS
PINION DEPTH SHIM ADJUSTMENT CHART (INCHES) \
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Old Pinion Marking Specification
+4
New Pinion Marking
-4 ....................................... +0.008
-3 ....................................... +0.007
-2 ....................................... +0.006
-1 ....................................... +0.005
0 ........................................ +0.004
+1 ....................................... +0.003
+2 ....................................... +0.002
+3 ....................................... +0.001
+4 ............................................ 0
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FLANGES
FLEX PLATES
FLUID LEVEL INDICATORS
FLUIDS AND LUBRICANTS
FLYWHEELS
FORCE MOTORS
GUIDES
HALF SHAFTS
HOSES, LINES AND TUBES
HOUSINGS (BELL, CASE, TAIL (EXTENSION) AND AUXILIARY)
INTERMEDIATE SHAFT SUPPORT BEARINGS
KEY INTERLOCK SYSTEMS
LIMITED SLIPS
LINES
LINKAGES (EXTERNAL)
LOCKING HUB ASSEMBLIES
LOCKING HUB CONTROL KNOBS
LUBRICANTS
METAL-CLAD SEALS
METALASTIC JOINTS
MODULATOR PINS
MODULATORS
MOUNTS (ENGINE, TRANSAXLE AND TRANSMISSION)
ODOMETER DRIVES (MECHANICAL)
ODOMETER HEADS (MECHANICAL)
OIL PANS
PANS
PILOT HOLES
PRESSURE PLATES
PRESSURE SWITCHES
RACES
RUBBER JOINTS (METALASTIC)
SCREENS
SEALS
SEALS (METAL-CLAD)
SELECTOR INTERLOCK SYSTEMS
SERVOS
SHIFT INTERLOCK SYSTEMS (SELECTOR AND KEY INTERLOCK SYSTEMS)
SENSORS
SIDE COVERS
SLIP YOKES
SOLENOIDS
SPEED SENSORS (ELECTRONIC WHEEL AND VEHICLE)
SPEEDOMETER-DRIVEN GEAR HOUSINGS
SPEEDOMETER/ODOMETER DRIVES (MECHANICAL)
SPEEDOMETER/ODOMETER HEADS (MECHANICAL)
SPEEDOMETERS AND ODOMETERS (ELECTRONIC)
SWITCHES
TONE WHEELS
TOOTHED RINGS (TONE WHEELS)
TORQUE CONVERTERS
TRANSAXLE MOUNTS
TRANSDUCERS (TRANSMISSION)
TRANSMISSION COOLERS
TRANSMISSION MOUNTS
TRANSMISSION PANS
TRANSMISSION RANGE INDICATORS (PRNDL)
TUBES
UNIVERSAL JOINTS (CARDON OR CROSS TYPE)
VACUUM CONTROLS
VACUUM HOSES
VACUUM MOTORS
VACUUM-OPERATED SWITCHES
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![JEEP CHEROKEE 1988 Service Repair Manual VENT INSPECTION \
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Condition Code")
VENT INSPECTION \
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Condition Code Procedure
Broken .................. A ............ Require replacement.
Missing ................. C ............ Require replacement.
Plugged ................. A ........... (1) Require repair or
replacement.
( 1) - A plugged vent may force fluid past the seal.
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VIBRATION DAMPERS
VIBRATION DAMPER INSPECTION \
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Condition Code Procedure
Broken .................. A ............ Require replacement.
Missing ................. C ............ Require replacement.
Out of position ......... B .. Require repair or replacement.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped (threads
missing) ............... A ............ Require replacement.
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WHEEL ATTACHMENT HARDWARE
NOTE: For conditions noted below, also check conditions of
wheel stud holes.
CAUTION: Proper lug nut torque is essential. Follow recommended
torque specifications and tightening sequence. DO NOT
lubricate threads unless specified by the vehicle
manufacturer.
WHEEL ATTACHMENT HARDWARE INSPECTION
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Condition Code Procedure
Bent .................... A ............ Require replacement.
Broken .................. A ........ ( 1) Require replacement.
Loose ................... B ... Require repair or replacement
of affected component.
Lug nut installed
backward ............... B .. Require repair or replacement.
Lug nut mating surface
dished ................. A ..... Require replacement of nut.
Lug nut mating type
incorrect .............. B ..... Require replacement of nut.
Lug nut rounded ......... A . ( 2) Require replacement of nut.
Lug nut seized .......... A . ( 2) Require replacement of nut.
Stud incorrect .......... B .... Require replacement of stud.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped (threads
missing) ............... A ............ Require replacement.
( 1) - Some manufacturers require replacement of all studs on
that wheel if two or more studs or nuts on the same wheel
are broken or missing.
( 2) - Only required if removing wheel.
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\003
EN G IN E R EM OVA L - 4 -C YL
1988 J e ep C hero ke e
1988 ENGINES
Jeep - Engine Removal - 4-Cylinder
Cherokee, Comanche, Wrangler
4-CYLINDER ENGINES
2.5L
1) Disconnect negative battery cable. Drain cooling system.
Remove air cleaner, lower radiator hose, fan shroud, and engine
compartment light from hood. Scribe hinge locations and remove hood.
Disconnect automatic transmission cooler lines at radiator (if
equipped).
2) Remove upper radiator hose, fan assembly and coolant
recovery hose. Remove radiator and A/C condenser (if equipped). Hold
fan pulley to water pump flange using 5/16" x 1/2" SAE capscrew.
Disconnect heater hoses, throttle linkages, cruise control cable (if
equipped) and Throttle valve rod.
3) Disconnect wires from starter and separate CEC system
wiring harness connector. Disconnect fuel pipe from fuel pump and fuel
return hose from fuel filter. Disconnect hoses from A/C compressor and
power steering pump (if equipped). Drain power steering pump
reservoir. Cap all fittings and hose ends.
4) Remove vacuum check valve from brake booster (if
equipped). Tag and remove all wiring and vacuum lines connected to
engine or accessories. Raise vehicle and remove starter. Disconnect
exhaust pipe from manifold.
5) Remove converter/flywheel housing cover. Remove engine
mount nuts at bracket side. On automatic transmission models, index
mark drive plate and torque converter. Remove drive plate-to-converter
bolts.
6) Remove upper and loosen lower bellhousing-to-engine bolts.
Attach lifting equipment to engine. Raise engine off front mounts,
Place support under bellhousing. Remove remaining bellhousing-to-
engine bolts. Lift engine out of engine compartment.
NOTE: Engine mount pads may be removed from engine brackets to
align engine and transmission during installation.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE \
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Application Ft. Lbs. (N.m)
Clutch Housing-to-Block Bolts .................... 55 (75)
Drive Plate-to-Converter ......................... 26 (35)
Flywheel Bolts ............................... ( 1) 50 (68)
Front Support Bracket-to-Block ................... 45 (61)
Front Support Cushion-to-Crossmember ............. 33 (45)
Rear Support Bracket-to-Transmission ............. 33 (45)
Rear Support Cushion-to-Bracket .................. 30 (41)
Starter Motor-to-Block ........................... 33 (45)
( 1) - Tighten an additional 60 degrees.
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transmission, remove converter housing cover. Index mark converter and
driven plate for reassembly. Remove driven plate-to-converter bolts,
rotating crankshaft to access each bolt. Remove oil pan bolts holding
automatic transmission oil lines. On Wrangler models, remove exhaust
pipe support brace at converter housing.
6) On manual transmission models, remove flywheel housing
cover. Remove inner support bolts for clutch release arm. Disconnect
springs and remove clutch release arm. Remove outer bracket retainer
for release lever rod. On all models, remove upper and loosen lower
bellhousing bolts.
7) Lower vehicle. Support transmission. If A/C equipped,
remove idler pulley and mounting bracket. Attach lifting equipment to
engine. Raise engine off front mounts and support transmission. Remove
lower bellhousing bolts. Lift engine from compartment while pulling
forward.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE \
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Application Ft. Lbs. (N.m)
Automatic Transmission-to-Block .................. 28 (38)
Clutch Housing-to-Block
Top ............................................ 27 (37)
Bottom ......................................... 43 (58)
Drive Plate-to-Converter ......................... 22 (30)
Drive Plate/Flywheel-to-Crankshaft ............. 105 (143)
Front Support Bracket-to-Block ................... 35 (47)
Front Support Cushion-to-Bracket ................. 33 (45)
Front Support Cushion-to-Crossmember ............. 37 (50)
Rear Support Bracket-to-Transmission ............. 33 (45)
Rear Support Cushion-to-Bracket .................. 30 (41)
Starter Motor-to-Converter Housing ............... 18 (24)
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