1988 JEEP CHEROKEE torque
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Disconnect throttle valve linkage on A/T models.
3) Remove coolant temperature sensor wire. Disconnect
throttle cable at bellcrank. Remove intake manifold bolts. Remove
intake manifold.
4) If exhaust manifold requires removal, raise and support
vehicle. Disconnect exhaust pipe. Remove oxygen sensor wire and remove
sensor. Remove manifold-to-cylinder head bolts. Remove exhaust
manifold.
Installation
1) Ensure all gasket surfaces are clean. Install manifolds
and gasket on cylinder head. Start all bolts and finger tighten.
Tighten bolts in proper sequence. See Fig. 1. Tighten bolts to
specification. See TORQUE SPECIFICATIONS table.
2) Clean oxygen sensor threads. Apply anti-seize on oxygen
sensor threads prior to installation. Install sensor and tighten to
specification. Reverse removal procedures to complete installation.
Fill and purge cooling system. See COOLING SYSTEM AIR PURGE under
ENGINE COOLING.
Fig. 1: Manifold Bolt Tightening Sequence
CYLINDER HEAD
Removal
1) Disconnect negative battery cable. Drain cooling system.
Remove air cleaner. Remove intake and exhaust manifolds. See INTAKE &
EXHAUST MANIFOLDS.
2) Disconnect and mark all hoses and electrical connections
at cylinder head. Disconnect and mark spark plug wires. Remove spark
plugs. Remove valve cover bolts.
Page 14 of 1378
![JEEP CHEROKEE 1988 Service Repair Manual Fig. 9: Measuring Oil Pump Gear End Clearance
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE \
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\](/manual-img/16/57037/w960_57037-13.png "JEEP CHEROKEE 1988 Service Repair Manual Fig. 9: Measuring Oil Pump Gear End Clearance
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE \
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Fig. 9: Measuring Oil Pump Gear End Clearance
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE \
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Application Ft. Lbs. (N.m)
Camshaft Sprocket Bolt .......................... 80 (109)
Connecting Rod Cap Nut ........................... 33 (45)
Cylinder Head Bolt
No. 8 ........................................ 100 (136)
All Others ................................... 110 (149)
Drive Plate-to-Converter Bolt .................... 22 (30)
EGR Valve Pipe Nut ............................... 30 (41)
Exhaust Manifold Bolt ............................ 23 (31)
Fan Bolt ......................................... 18 (24)
Flywheel-to-Crankshaft Bolt .................. ( 1) 50 (68)
Intake Manifold Bolt ............................. 23 (31)
Main Bearing Cap Bolt
Page 15 of 1378
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 56 of 1378
from intake manifold. Disconnect fuel lines at fuel rail. Fuel lines
are removed by squeezing the 2 retaining tabs against the fuel line
and pulling the fuel line from the connector. Use caution as these
fuel lines are under pressure.
3) Loosen drive belt tensioner and remove drive belt. Remove
power steering pump and bracket from intake manifold. Remove fuel rail
retaining bolts. Remove fuel rail and injector assembly.
4) Remove intake manifold heat shield. Disconnect EGR tube
fittings. Disconnect exhaust pipe from manifold. Disconnect oxygen
sensor. Remove retaining bolts and remove manifolds.
Installation
1) Install new gasket. Install exhaust and intake manifolds
and loosely install bolts. Install EGR tube between manifolds. Tighten
manifold bolts in proper sequence see Fig. 1. Tighten to
specifications, see TORQUE SPECIFICATIONS TABLE in this article.
2) Tighten EGR tube bolts. Apply anti-seize to oxygen sensor
threads prior to installation. Reverse removal procedures for
remaining components. Tighten bolts to specification.
3) Install new "O" rings on fuel line connectors prior to
installation. Ensure "CLICK" sound is heard when installing fuel
lines. This indicates that fuel lines are properly seated.
Fig. 1: Manifold Tightening Sequence (4.0L)
Courtesy of Chrysler Motors.
INTAKE & EXHAUST MANIFOLD (4.2L)
Removal
1) Remove air cleaner. Disconnect fuel line at carburetor.
Mark and disconnect all vacuum hoses, ventilation hoses and electrical
connectors at intake manifold.
2) Disconnect throttle cable at bellcrank. On A/T models,
disconnect throttle valve rod. On all models, remove PCV hose from
manifold. Drain cooling system. Remove coolant hoses from intake
Page 68 of 1378
oil pump 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 & Inspection
1) Disassemble pump. See Fig. 8. Use feeler gauge and
straightedge to check gear end clearance. Place straightedge across
gears and pump body. Using feeler gauge, determine thickness feeler
gauge which fits snugly between straightedge and gears.
2) With gears installed in pump body, insert feeler gauge
between gear tooth and inner wall of pump body to check gear-to-body
clearance. Rotate gears and measure clearance at each gear tooth.
3) Compare measurements to specification. See OIL PUMP
SPECIFICATIONS table. Repair as necessary if not within
specifications. Check pressure regulator valve for wear or binding in
pump body. Replace components if wear or binding exists.
OIL PUMP SPECIFICATIONS TABLE
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Application In. (mm)
Gear End Clearance ........... .004-.008 (.10-.20)
Gear-to-Body Clearance ....... .002-.004 (.05-.10)
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CAUTION: If pressure regulator valve is replaced, ensure replacement
valve is the same diameter as that removed. Different
diameter valves may be used.
Reassembly & Installation
1) Reverse procedures for reassembly and installation. Apply
Permatex No. 2 to pick-up pipe prior to installation. Using Pipe
Installer (J-21882), install pick-up pipe. Ensure pick-up pipe support\
bracket is aligned with pump cover bolt.
2) Fill gear cavity with petroleum jelly prior to installing
cover. Apply Loctite on pump cover area. Install cover and bolts.
Tighten bolts to specification. Check pump gears for freedom of
rotation.
3) Install oil pump and new gasket. Tighten retaining bolts
to specification.
Fig. 8: Exploded View of Oil Pump Assembly
Courtesy of Chrysler Motors.
TORQUE SPECIFICATIONS TABLE
Page 69 of 1378
![JEEP CHEROKEE 1988 Service Repair Manual TORQUE SPECIFICATIONS TABLE \
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TORQUE SPECIFICATIONS TABLE \
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Application Ft. Lbs. (N.m)
Camshaft Sprocket Bolt .......................... 80 (109)
Connecting Rod Cap Nut ........................... 33 (45)
Crankshaft Pulley-to-Damper Bolt ................. 20 (27)
Cylinder Head Bolt
4.0L
No. 11 .................................... 100 (135)
All Others ................................. 110 (149)
4.2L
No. 11 ..................................... 75 (102)
All Others .................................. 85 (115)
Exhaust Pipe-to-Manifold Bolt .................... 20 (27)
Fan & Hub Bolt ................................... 18 (24)
Flywheel-to-Crankshaft Bolt .................... 105 (142)
Fuel Rail Bolt ................................... 20 (27)
Intake & Exhaust Manifold Bolt
4.0L
Exhaust Manifold Bolts 1-5 ................... 23 (31)
Exhaust Manifold Bolts 6-7 .................. 17 (23)
Exhaust Manifold Bolts 8-11 ................. 23 (31)
Exhaust Manifold Bolts 12-13 ................ 30 (41)
4.2L ........................................... 23 (31)
Main Bearing Cap Bolt
Step 1 ......................................... 40 (54)
Step 2 ......................................... 70 (95)
Step 3 ........................................ 80 (109)
Oil Pump Attaching Bolt
Short .......................................... 10 (14)
Long ........................................... 17 (23)
Oxygen Sensor .................................... 35 (47)
Rocker Arm Bolt .................................. 19 (26)
Vibration Damper Bolt ....................... (1) 80 (109)
Water Pump Bolts ................................. 13 (18)
INCH Lbs. (N.m)
Engine Front Cover
Bolt ............................................ 60 (7)
Studs ......................................... 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) - Clean and lubricate with oil prior to tightening.
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ENGINE SPECIFICATIONS
GENERAL ENGINE SPECIFICATIONS
GENERAL SPECIFICATIONS TABLE \
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Application In. (mm)
4.0L
Displacement
Page 70 of 1378
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 99 of 1378
TCC Torque Converter Clutch
TCCS Toyota Computer Control System
TDC Top Dead Center
TDCL Total Diagnostic Communication Link
TFI Thick Film Ignition system
TGS Top Gear Switch (cancels SIL in top gear)
THERMAC Thermostatic Air Cleaner
THS Transmission Hydraulic Switch
TP/TPS Throttle Position Sensor
TPI Tuned Port Injection
TPS Throttle Position Sensor/Switch
TS Temperature Sensor
TSB Technical Service Bulletin
TTS Transmission Temperature Switch
TV Thermovalve
TWC Three-Way Catalyst
Temp. Temperature
Trans. Transaxle/Transmission
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"V" ABBREVIATION TABLE
"V" ABBREVIATION TABLE \
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ABBREVIATION DEFINITION
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V Valve
VAF Vane Air Flow sensor or circuit
VAPS Variable Assist Power Steering
VAT Vane Air Temperature
VATS Vehicle Anti-Theft System
VBATT Vehicle Battery Voltage
VCC Viscous Converter Clutch
VIN Vehicle Identification Number
VIO Violet
VLR Volt Loop Reserve
VM Vacuum Modulator
VM Vane Meter
VOM Volt-Ohmmeter (Analog)
VPWR Vehicle Power supply voltage (10-14 volts)
VREF Voltage Reference (ECA supplied reference voltage
VRV Vacuum Regulator Valve
VSC Vehicle Speed Control sensor or signal
VSS Vehicle Speed Sensor or signal
VSV Vacuum Switching Valve
Vac. Vacuum
Volt. Voltage
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"W" ABBREVIATION TABLE
"W" ABBREVIATION TABLE \
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ABBREVIATION DEFINITION
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W/ With
W/O Without
WAC WOT A/C Cut-off switch or circuit
WAC Wide Open Throttle A/C Switch
WHT White
WOT Wide Open Throttle
YEL Yellow