1988 JEEP CHEROKEE height

tyre pressure bulb seat adjustment fuse diagram warning light winter tyres

Page 4 of 1378

JEEP CHEROKEE 1988 Service Repair Manual Removal
1) Remove PCV valve hose at valve cover. Remove valve cover
bolts. Using a razor knife, cut RTV sealant along valve cover. Pry
upward on valve cover in areas marked "PRY HERE

Removal
1) Remove PCV valve hose at valve cover. Remove valve cover
bolts. Using a razor knife, cut RTV sealant along valve cover. Pry
upward on valve cover in areas marked "PRY HERE" near bolt hole areas.
2) Remove valve cover. Alternately loosen each rocker arm
bolt one turn at a time. Remove rocker arm assemblies and push rods.
Mark components for reassembly. Components must be installed in
original location.
Installation
Reverse removal procedures. Install rocker arm components in
original location. Tighten bolts to specification. Apply RTV sealant
on valve cover prior to installation.
VALVE SPRINGS
Valve springs can be removed without removing cylinder head.
Valve Spring Installed Height
Information not available from manufacturer.
HYDRAULIC VALVE LIFTERS
Removal
Remove rocker arms and push rods. See ROCKER ARMS & BRIDGE.
Using Lifter Remover/Installer (J-21884), remove lifter through push
rod openings of cylinder head. Mark lifter location for reassembly
reference. Replace lifters as an assembly if damaged. Internal
components cannot be interchanged.
Inspection
Inspect lifter and camshaft mating surfaces for wear. Check
cylinder block lifter bore diameter. Lifter bore diameter should be
within .9055-.9065" (22.999-23.025 mm). Replace parts as necessary.
Installation
Soak lifter assembly in engine oil supplement prior to
installation. Reverse removal procedures for installation. Install
lifter in original location.
ENGINE FRONT COVER
Removal
1) Disconnect negative battery cable. Remove drive belts, fan
and hub assembly. Remove pulley from vibration damper. Remove
vibration damper retaining bolt and washer.
2) Using Puller (J-21719-01), remove vibration damper and
key. Remove oil pan-to-front cover bolts. Remove cover-to-block
retaining bolts. Remove front cover.
3) Cut oil pan gasket even with face of cylinder block.
Remove gasket from oil pan. Pry crankshaft oil seal from cover.
Installation
1) Ensure all gasket surfaces are clean. Ensure oil slinger
is installed on crankshaft. Apply sealing compound on both sides of
front cover gasket. Install gasket on cylinder block. Replace front
section of oil pan seal with similar section fabricated from new seal.
2) Coat seal with RTV sealant and place in position. Apply
sealant to the joint area of oil pan and cylinder block. Place front
cover on cylinder block. Place Front Cover Seal Installer (J-22248) in\
front cover seal area.
3) Install all retaining bolts. Tighten bolts to

Page 59 of 1378

JEEP CHEROKEE 1988 Service Repair Manual VALVE SPRING
Valve springs can be removed without removing cylinder head.
Valve Spring Installed
For 4.0L the Valve Spring Installed Height Specification is
1.625

VALVE SPRING
Valve springs can be removed without removing cylinder head.
Valve Spring Installed
For 4.0L the Valve Spring Installed Height Specification is
1.625 inches or 41.29 mm. For the 4.2L the information is not
available from manufacturer.
HYDRAULIC VALVE LIFTER
Removal
Remove cylinder head. See CYLINDER HEAD. Using Lifter
Remover/Installer (J-21884), remove lifter. Mark lifter location for
reassembly reference. Replace lifters as an assembly if damaged.
Internal components cannot be interchanged.
Inspection
Inspect lifter and camshaft mating surfaces for wear. Check
cylinder block lifter bore diameter. Lifter bore diameter should be
within .9055-.9065" (22.999-23.025 mm). Replace parts as necessary.
Installation
Soak lifter assembly in engine oil prior to installation.
Reverse removal procedure for installation. Install lifter in original
location.
ENGINE FRONT COVER
Removal
1) Disconnect negative battery cable. Remove drive belts, fan
and hub assembly. Remove pulley from vibration damper. Remove
vibration damper retaining bolt and washer.
2) Using Puller (J-21719-01), remove vibration damper and
key. Remove alternator and A/C compressor bracket (if equipped).
Remove oil pan-to-front cover bolts. Remove cover-to-block retaining
bolts. Remove front cover.
3) Cut oil pan gasket tabs even with face of cylinder block.
Remove tabs. Remove gasket from oil pan. Pry crankshaft oil seal from
cover.
Installation
1) Ensure all gasket surfaces are clean. Ensure oil slinger
is installed on crankshaft. Apply sealing compound on both sides of
front cover gasket. Install gasket on cylinder block. Replace front
section of oil pan seal with similar section fabricated from new seal.
2) Coat seal with RTV sealant and place in position. Apply
sealant to the joint area of oil pan and cylinder block. Apply engine
oil on seal-to-oil pan contact areas.
3) Place front cover on cylinder block. Place Front Cover
Seal Installer (J-22248) in front cover seal area. Install all
retaining bolts. Tighten bolts to specification.
4) Install front cover oil seal. See FRONT COVER OIL SEAL in
this article. Remove front cover seal installer. Reverse removal
procedure for remaining components. Lubricate vibration damper
retaining bolt with oil prior to installation. Tighten bolts to
specification.
FRONT COVER OIL SEAL
1) Remove vibration damper. Pry seal from front cover. Use

Page 70 of 1378

JEEP CHEROKEE 1988 Service Repair Manual Cu. In. .......................................... 242
Liters ........................................... 4.0
Fuel System ........................................ MPI
HP@RPM .......

Cu. In. .......................................... 242
Liters ........................................... 4.0
Fuel System ........................................ MPI
HP@RPM ...................................... 173 @ 2500
Torque Ft. Lbs.@RPM ......................... 220 @ 2500
Compression Ratio ................................ 9.2:1
Bore ....................................... 3.88 (98.4)
Stroke ..................................... 3.44 (87.4)
4.2L
Displacement
Cu. In. .......................................... 258
Liters ........................................... 4.2
Fuel System ..................................... 2-Bbl.
HP@RPM ...................................... 112 @ 3000
Torque Ft. Lbs.@RPM ......................... 210 @ 2000
Compression Ratio ................................ 9.2:1
Bore ....................................... 3.75 (95.3)
Stroke ..................................... 3.90 (98.9)
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VALVE SPECIFICATIONS
VALVES SPECIFICATIONS TABLE\
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Application In. (mm)
4.0L
Intake
Head Diameter ........................... 1.91 (48.51)
Face Angle ....................................... 45

Seat Angle ..................................... 44.5
Seat Width ..................... .040-.060 (1.02-1.52)
Stem Diameter ............................ .312 (7.92)
Stem Clearance ................... .001-.003 (.03-.08)
Valve Lift .............................. .424 (10.76)
Exhaust
Head Diameter ........................... 1.50 (38.10)
Face Angle ....................................... 45

Seat Angle ..................................... 44.5
Seat Width ..................... .040-.060 (1.02-1.52)
Stem Diameter ............................ .312 (7.92)
Stem Clearance .................. .001-.003 (.03-.003)
Valve Lift .............................. .424 (10.76)
Valve Spring Height Installed ............ 1.625 (41.29)
4.2L
Intake
Head Diameter .................. 1.78-1.79 (45.3-45.5)
Face Angle ....................................... 29

Seat Angle ....................................... 30
Seat Width ..................... .040-.060 (1.02-1.52)
Stem Diameter ................ .3715-.3725 (9.44-9.46)
Stem Clearance ................... .001-.003 (.03-.08)
Valve Lift .............................. .405 (10.29)
Exhaust
Head Diameter .................. 1.40-1.41 (35.6-35.8)
Face Angle ....................................... 44

Seat Angle ..................................... 44.5
Seat Width ..................... .040-.060 (1.02-1.52)
Stem Diameter ................ .3715-.3725 (9.44-9.46)
Stem Clearance ................... .001-.003 (.03-.08)
Valve Lift .............................. .405 (10.29)
Valve Spring Height Installed ...................... ( 1)

Page 94 of 1378

$JEEP CHEROKEE 1988 Service Repair Manual \ \b\ \ \ \ \ \ g grams$

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g grams

GND or GRND Ground

GRN Green

GRY Gray

Ga. Gauge

Gals. gallons

Gov. Governor

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"H" ABBREVIATION TABLE
"H" ABBREVIATION TABLE\
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ABBREVIATION DEFINITION

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H/D Heavy Duty

HAC High Altitude Compensation

HC Hydrocarbons

HEDF High Speed Electro Drive Fan relay or circuit

HEGO Heated Exhaust Gas Oxygen Sensor

HEGOG HEGO Ground circuit

HEI High Energy Ignition

HLDT Headlight

HO High Output

HP High Performance

HSC High Swirl Combustion

HSO High Specific Output

HTR Heater

HVAC Heating

Headlt. Headlight

Hg Mercury

Hgt. Height

Htr. Heater

Hz Hertz (Cycles Per Second)

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"I" ABBREVIATION TABLE
"I" ABBREVIATION TABLE\
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ABBREVIATION DEFINITION

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I.D. Inside Diameter

IAC Idle Air Control

IACV Idle Air Control Valve

IC Integrated Circuit

ID Identification

IDM Ignition Diagnostic Monitor

IGN Ignition system or circuit

ILC Idle Load Compensator

In. Hg Inches of Mercury

INCH Lbs. Inch Pounds

INFL REST Inflatable Restraint

INJ Injector or Injection

IP Instrument Panel

IPC Instrument Panel Cluster

ISA Idle Speed Actuator

ISC Idle Speed Control

ISS Idle Stop Solenoid

ITS Idle Tracking Switch

IVSV Idle Vacuum Switching Valve

Page 317 of 1378

JEEP CHEROKEE 1988 Service Repair Manual and reinstalled. Brake shoes can be manually adjusted by rotating
adjuster screw. Remove access slot cover.
3) Using a small blade screwdriver, push in on adjustment
lever to separate from ad

Page 386 of 1378

$JEEP CHEROKEE 1988 Service Repair Manual PINION DEPTH 1) Depth Gauge Set (D-271) is used to determine pinion depth\ . Place Master Pinion Block (D-139 on Model 44; D-120 on Model 60 and 61; D-137 on Model 70; T80T-4020-F42$

PINION DEPTH
1) Depth Gauge Set (D-271) is used to determine pinion depth\
.
Place Master Pinion Block (D-139 on Model 44; D-120 on Model 60 and
61; D-137 on Model 70; T80T-4020-F42 on Model 80) in pinion bore of
carrier. Put Arbor Discs (D-115-4-44 on Model 44; D-116-2 on Models
60,61 and 70; (T88T-4020-A) on Arbor (D-115-3). Install arbor in
carrier with discs riding in bearing bore.
2) Put Pinion Height Block (D-115-1-44 on Model 44; D-116-1
on Models 60, 61, 70 and 80) on top of master pinion block with side
against arbor. Place Scooter Block (115-2) with Dial Indicator (D-106\
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5) on small step of pinion height block. Zero dial indicator with
scooter block flat on pinion height block.
3) Move scooter block so dial indicator tip touches arbor.
Move block back and forth (perpendicular to arbor) to get highest
reading. This reading, plus or minus value etched on pinion head, is
thickness of shim pack necessary for pinion bearing.
4) On Model 80, Use Gauge Tube (D81T-4020-F51) and Gauge
Block (D81T-4020-F56) to determine required thickness of shim pack.
5) On all models, measure shims separately with micrometer.
If baffle is used, its thickness must be included in shim pack. This
is also true if slinger is used between inner bearing and head of
pinion shaft. Place pinion height shim pack in carrier bore for inner
bearing race. Drive bearing race into carrier, making sure cup is
fully seated.
PINION BEARING PRELOAD
1) Drive outer pinion bearing into carrier housing. Press
inner pinion bearing onto pinion shaft using Press Tube (C-3095-A).
Ensure bearing seats fully. Insert pinion shaft into carrier. Install
outer bearing, slinger (if equipped), flange, washer and nut.
NOTE: Pinion preload shims and oil seal should NOT be installed at
this time.
2) Using an INCH lb. torque wrench, tighten pinion nut until
10 INCH lbs. (1.13 N.m) rotational torque is required to move pinion
shaft. Recheck pinion depth with arbor and discs at this time. Place
pinion height block on face of pinion shaft.
3) Place dial indicator on small step of height block for
Model 44, 60 and 61 axles. Place dial indicator on high step of block
for Models 70 and 80 axles. Zero dial indicator and move it across
arbor to get highest reading. If reading is within .002" (.05 mm) of
etching on pinion face, pinion depth is correct.
NOTE: If pinion depth is not with .002" (.05 mm) of etched number
on face of pinion, shim pack under inner bearing race must
be changed before proceeding with differential settings.
4) Remove pinion nut, washer, flange, slinger and outer
bearing. Place preload shims (removed during disassembly) on pinion.
Install bearing and slinger. After lightly coating lips with gear oil,
install pinion seal in carrier housing. Install flange, washer and NEW
pinion nut. Tighten nut to specification. See TORQUE SPECIFICATIONS
table at end of this article.
5) Using an INCH lb. torque wrench, measure preload
(rotational torque) of pinion shaft. Rotational torque required to
keep pinion shaft turning freely and smoothly should be 20-40 INCH
lbs. (2.3-4.5 N.m). If preload needs to be increased, remove a few
shims and recheck. To decrease preload, add a few shims and recheck.
See Fig. 14 .

Page 616 of 1378

JEEP CHEROKEE 1988 Service Repair Manual spring tester, test valve spring pressure at installed and compressed
heights. See Fig. 5.
Usually compressed height is installed height minus valve
lift. Replace valve spring if not within s

Page 621 of 1378

JEEP CHEROKEE 1988 Service Repair Manual the old insert and machining an oversize insert bore. Replacement
oversize insert is usually chilled and the cylinder head is sometimes
warmed. Valve seat is pressed into the head. This operation requ

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dashboard air conditioning catalytic converter width emergency towing coolant