1988 JEEP CHEROKEE Service Repair Manual

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Page 9 of 1378

JEEP CHEROKEE 1988 Service Repair Manual Fig. 6: Piston Pin Removal & Installation
2) Position driver inside pin. Using arbor press, press pin
through rod and piston bores until pilot indexes with mark on support.
Remove piston and

Page 10 of 1378

JEEP CHEROKEE 1988 Service Repair Manual NOTE: Crankshaft journal diameters are indicated by a color coded
mark placed on the adjacent counterweight or cheek toward
the flanged (rear) end of crankshaft. Note color code t

NOTE: Crankshaft journal diameters are indicated by a color coded
mark placed on the adjacent counterweight or cheek toward
the flanged (rear) end of crankshaft. Note color code to
determine proper bearing usage. Check oil clearance after
bearing installation.
Removal
1) Remove oil pan. See OIL PAN REMOVAL at end of ENGINE
section. See oil pump. See OIL PUMP under ENGINE OILING. Remove main
bearing cap.
2) Rotate crankshaft to position rod to be serviced at bottom
of stroke. Mark bearing cap and connecting rod. Remove bearing cap
with bearing. Push piston and rod assembly up to remove upper bearing.
Installation
1) Note color code on edge of bearings removed. Install
bearings. Using Plastigage method, check bearing clearances. Replace
bearings as necessary to obtain correct clearance. Bearings are
available in standard and undersize application.
2) If required, different sized upper and lower bearings may
be installed to obtain correct oil clearance. Tighten bolts to
specification. Check rod side play. Rotate crankshaft to ensure
freedom of movement. Reverse removal procedures for remaining
components. Tighten bolts to specification.
NOTE: Avoid combining bearing inserts in excess of .001" (.02 mm)
difference in size. Odd size inserts must be on bottom (rod
cap) side.
MAIN BEARINGS
Removal
1) Remove oil pan. See OIL PAN REMOVAL at end of ENGINE
section. Remove oil pump. See OIL PUMP under ENGINE OILING.
2) Ensure main bearing caps are marked for location. Rotate
crankshaft to remove bearings. Note color code on edge of bearing.
NOTE: Crankshaft journal diameters are indicated by a color coded
mark placed on the adjacent counterweight or cheek toward
the flanged (rear) end of crankshaft. Note color code to
determine proper bearing usage. Check oil clearance after
bearing installation.
Installation
1) Note color code on edge of bearings removed. Install
bearings. Ensure caps are installed in original location. Using
Plastigage method, check bearing clearances.
2) Replace bearings as necessary to obtain correct clearance.
Bearings are available in standard and undersize applications. If
required, different sized upper and lower bearings may be installed to
obtain correct oil clearance.
NOTE: If different sized bearings are used, the odd sized bearings
must all be uniform in location (upper or lower). DO NOT use
bearings with a thickness difference exceeding .001" (.02
mm).
3) Apply Loctite to corners of rear main bearing cap prior to
final installation. Tighten bolts to specification. Check crankshaft
end play. See CRANKSHAFT END PLAY. Rotate crankshaft to ensure freedom
of movement. Reverse removal procedures for remaining components.
Tighten bolts to specification.

Page 11 of 1378

JEEP CHEROKEE 1988 Service Repair Manual Crankshaft End Play
1) Using dial indicator, check crankshaft end play. Inspect
crankshaft thrust surfaces or thrust bearing for wear if not within
specification. See ENGINE SPECIFIC

Page 12 of 1378

JEEP CHEROKEE 1988 Service Repair Manual 1) Drain cooling system. Remove fan shroud and drive belts.
Remove fan assembly.
2) Disconnect heater hoses and lower radiator hose at water
pump. Remove water pump retaining bolts.

1) Drain cooling system. Remove fan shroud and drive belts.
Remove fan assembly.
2) Disconnect heater hoses and lower radiator hose at water
pump. Remove water pump retaining bolts. Remove water pump.
Installation
Clean all gasket surfaces. Install water pump. Tighten bolts
to specification. Ensure pump turns freely. Reverse removal
procedures. Fill and purge air from cooling system.
NOTE: It may be necessary to remove heater hose to remove trapped
air if system cannot be purged using following procedures.
Cooling System Air Purge (Vehicles With Coolant Recovery)
Fill system to proper level. Place heater control to "HEAT"
position and temperature control to "WARM" or "HIGH" position. Install
coolant caps. Operate engine to normal operating temperature. Shut off
engine and allow system to cool. Add coolant to recovery bottle.
Repeat procedure to obtain correct coolant level.
Cooling System Air Purge (Vehicles Without Coolant Recovery)
Fill system to proper level. Place heater control to "HEAT"
position and temperature control to "WARM" or "HIGH" position. Operate
engine to normal operating temperature with radiator cap removed. Add
necessary coolant and install radiator cap.
NOTE: For further information on cooling system capacities and
other cooling system components, see ENGINE COOLING SYSTEMS
article.
ENGINE OILING
CRANKCASE CAPACITY
Crankcase capacity is 4 qts. (3.8 L) with oil filter change.
NORMAL OIL PRESSURE
Normal oil pressure should be 13 psi (.91 kg/cm) at 600 RPM
or 37-75 psi (2.6-5.3 kg/cm) at 1600 RPM.
OIL PRESSURE REGULATOR VALVE
Oil pressure regulator valve is located in oil pump body and
is nonadjustable.
OILING SYSTEM
Engine lubrication is provided by the distributor driven
gear-type oil pump. Oil is supplied through the full-flow oil filter
and into an internal oil passage. Internal passage runs along right
side of block and intersects lifter bores.
Oil is then routed to camshaft and crankshaft bearings. Oil
is supplied to rocker arms from the hydraulic lifters and through the
push rods. By-pass valves are located in oil filter mounting and oil
pump.
OIL PUMP
Removal
Remove oil pan. See OIL PAN REMOVAL article. Remove oil pump

Page 13 of 1378

JEEP CHEROKEE 1988 Service Repair Manual retaining bolts.
CAUTION: DO NOT move oil pick-up pipe in pump body. If oil pick-up
pipe is moved, pick-up pipe must be replaced to ensure an
airtight seal.
Disassembly & I

Page 14 of 1378

$JEEP CHEROKEE 1988 Service Repair Manual Fig. 9: Measuring Oil Pump Gear End Clearance TORQUE SPECIFICATIONS TORQUE SPECIFICATIONS TABLE��\ ��\ ��\ ��\ ��$

Page 15 of 1378

JEEP CHEROKEE 1988 Service Repair Manual Step 1 ........................................ 40 (54)
Step 2 ........................................ 70 (95)
Step 3 ....................................... 80 (109)
Oil Pump Retainin

Step 1 ........................................ 40 (54)
Step 2 ........................................ 70 (95)
Step 3 ....................................... 80 (109)
Oil Pump Retaining Bolt
Short .......................................... 10 (14)
Long ........................................... 17 (23)
Oxygen Sensor .................................... 35 (47)
Pulley-to-Vibration Damper Bolt .................. 20 (27)
Rocker Arm Bolt .................................. 19 (26)
Throttle Body-to-Intake Bolt ..................... 16 (22)
Torque Converter Drive
Plate-to-Crankshaft Bolt .................... (1) 40 (54)
Vibration Damper Bolt ....................... ( 2) 80 (109)
Water Pump Bolt .................................. 13 (18)
INCH Lbs. (N.m)
Front Cover-to-Block
Bolt ............................................ 60 (7)
Stud .......................................... 192 (22)
Oil Pan Bolt
1/4" X 20 ....................................... 84 (9)
5/16" X 18 .................................... 132 (15)
Oil Pump Cover Bolt ............................... 70 (8)
Valve Cover Bolt .................................. 55 (5)
( 1) - Tighten to specification and an additional 60 degrees.
( 2) - With bolt cleaned and threads lubricated with oil.
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ENGINE SPECIFICATIONS
GENERAL ENGINE SPECIFICATIONS
GENERAL ENGINE SPECIFICATIONS TABLE\
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Application In. (mm)
Displacement
Cu. In. ............................................ 150
Liters ............................................. 2.5
Fuel System .......................................... TBI
HP @ RPM ...................................... 117 @ 5000
Torque Ft. Lbs. @ RPM ......................... 135 @ 3500
Compression Ratio .................................. 9.2:1
Bore ......................................... 3.88 (98.5)
Stroke ....................................... 3.19 (81.0)
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VALVE SPECIFICATIONS
VALVE SPECIFICATIONS TABLE\
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Application In. (mm)
Intake ( 1)
Head Diameter ................ 1.905-1.915 (48.38-48.60)
Face Angle ......................................... 44

Seat Angle ..................................... 44 30'
Seat Width ................... ( 2) .040-.060 (1.02-1.52)
Stem Diameter .................... .311-.312 (7.89-7.98)
Stem Clearance ..................... .001-.003 (.02-.08)
Valve Lift ................................ .424 (10.76)

Page 16 of 1378

JEEP CHEROKEE 1988 Service Repair Manual Exhaust (1)
Head Diameter ................ 1.495-1.505 (37.97-38.60)
Face Angle ......................................... 44

Seat Angle ..................................... 44 30
Se

Exhaust (1)
Head Diameter ................ 1.495-1.505 (37.97-38.60)
Face Angle ......................................... 44

Seat Angle ..................................... 44 30'
Seat Width ................... ( 2) .040-.060 (1.02-1.52)
Stem Diameter .................... .311-.312 (7.89-7.98)
Stem Clearance ..................... .001-.003 (.02-.08)
Valve Lift ................................ .424 (10.76)
( 1) - Minimum valve margin is 1/32" (.78 mm).
( 2) - Maximum seal runout is .0025" (.084 mm).
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PISTON/PIN/RING SPECIFICATIONS
PISTONS, PINS & RINGS SPECIFICATIONS TABLE\
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Application In. (mm)
Piston Clearance ................. .0009-.0017 (.023-.043)
Pins
Piston Fit ..................... .0003-.0005 (.008-.013)
Rod Fit ...................................... Press Fit
Rings
Ring No. 1 & 2
End Gap .......................... .010-.020 (.25-.51)
Side Clearance ............... .0017-.0032 (.043-.081)
Ring No. 3
End Gap .......................... .010-.025 (.25-.64)
Side Clearance .................. .001-.008 (.03-.020)
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BEARING SPECIFICATIONS
CRANKSHAFT MAIN & CONNECTING ROD BEARINGS SPECS TABLE\
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Application In. (mm)
Main Bearings
Journal Diameter ......... 2.4996-2.5001 (63.489-63.502)
Clearance ....................... .0010-.0025 (.02-.063)
Thrust Bearing ................................... No. 2
Crankshaft End Play ............ .0015-.0065 (.038-.165)
Connecting Rod Bearings
Journal Diameter ......... 2.0934-2.0955 (53.172-53.225)
Clearance .......................... .001-.003 (.02-.08)
Side Play .............................010-.019 (.02-.48)
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VALVE SPRING SPECIFICATIONS
VALVE SPRINGS SPECIFICATIONS TABLE\
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Application In. (mm)
Free Length .................................. 1.82 (46.2)
Pressure ( 1)
Valve Closed ............... 66-74 @ 1.63 (30-34 @ 41.3)
Valve Open .............. 205-220 @ 1.20 (91-100 @ 30.5)
( 1) - Lbs. @ In. (Kg @ mm).
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