1988 JEEP CHEROKEE 6 cylinder

WARNING: The knock sensor MUST be tightened to the EXACT torque
specified in order to ensure proper operation.
1) Install the knock sensor to the cylinder block. Tighten
the knock sensor to 89 INCH Lbs. (10 Nm).
2) Connect the knock sensor wire connector.
3) Lower vehicle.
ENGINE SPEED SENSOR
Removal
1) Remove engine speed sensor wire connector. See Fig. 21.
2) Remove the engine speed sensor-to-transmission housing
attaching bolts. Remove engine speed sensor from transmission housing.
Fig. 21: Engine Speed Sensor Mounting Bolts
Courtesy of Chrysler Motors.
Installation
1) Install the engine speed sensor to the transmission

Removal
1) Disconnect the battery negative cable.
2) On vehicles equipped with A/C, remove the electrical
cooling fan and shroud assembly from the radiator to allow room to
rotate the engine with a socket and ratchet using the vibration damper
bolt.
3) Scribe a mark on the distributor housing below the left
side (past) the number one spark plug wire post of the distributor cap\
for reassembly reference for No 1 cylinder firing position.
4) Remove the distributor cap.
5) Turn the engine in a clockwise direction until the rotor
is approaching the scribed mark on the distributor housing. Then
slowly turn the engine until the timing mark on the crankshaft
vibration damper lines up with zero on the front cover timing scale.
See Fig. 24 .
NOTE: The timing mark is located on the edge of the vibration
damper closest to the front cover.
Fig. 24: View of Crankshaft Vibration Damper Timing Marks
Courtesy of Chrysler Motors.
6) Align the trailing edge of the rotor blade with the mark
previously scribed on the distributor housing. See Fig. 25.

MAIN TE N AN CE IN FO RM ATIO N

1988 J e ep C hero ke e
1984-88 MAINTENANCE
AMC/Jeep Maintenance Information
Jeep; Cherokee,
Wagoneer
* PLEASE READ THIS FIRST *
NOTE: For scheduled maintenance intervals and the related fluid
capacities, fluid specifications and labor times for major
service intervals, see SCHEDULED SERVICES article below:
* SCHEDULED SERVICES - GASOLINE
* SCHEDULED SERVICES - DIESEL ENGINES - NORMAL (1985-87)
Warranty information and specifications for fluid
capacities, lubrication specifications, wheel and tire size,
and battery type are covered in this article.
MODEL IDENTIFICATION
VIN LOCATION
The Vehicle Identification Number (VIN) is located on the
left side of the dash panel at the base of the windshield. The VIN
chart explains the code characters.
VIN CODE ID EXPLANATION
Numbers preceding the explanations in the legend below refer
to the sequence of characters as listed on VIN identification label.
See VIN example below.








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(VIN) 1 J C U N 7 7 1 X G T 0 0 0 0 0 1 


1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 










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1 - Manufacturing Country
1
* United States
2 - Company/Make
J * American Motors/Jeep
3 - Type
C * Multi-Purpose Vehicle
D * Incomplete Vehicle
E * Export, LHD
F * Export, RHD
4 - Engine Type
B * 2.1L (128 CID) 4-Cylinder Turbo (Diesel) (001B) (1985-87)
H * 2.5L (150 CID) 4-Cylinder TBI (Gasoline) (001H) (1986-88)
U * 2.5L (150 CID) 4-Cylinder 1-Bbl. (Gasoline) (001U) (1984-85)
Y * 2.5L (150 CID) 4-Cylinder 1-Bbl. (Export) (001Y) (1984-85)
W * 2.8L (171 CID) V6 2-Bbl. (Gasoline) (001W) (1984-86)
M * 4.0L (242 CID) I-6 (Gasoline) (001M) (1987-88)

Fig. 10: Identification Label Locations
Courtesy of American Motors Corp.
LUBRICATION SPECIFICATIONS
LUBRICATION SPECIFICATIONS TABLE








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Application Fluid Specifications
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
\b F (-1\bC) ....... SAE 20W-40 Or 20W-50 API SH/CD
Above 0\b F (-18\bC) ........ SAE 10W-30 Or 10W-40 API SH/CD
Less Than 60\b F (16\bC) .............. SAE 5W-30 API SH/CD
Diesel Engine
Temperature Range
Above 30
\b F (-1\bC) ................ SAE 15W-40, 20W-40 Or
20W-50 API SH/CD
0
\b F (-18\bC) to 100\b F (38\bC) ...... SAE 10W-30 API SH/CD
Less Than 50\b F (10\bC) .............. SAE 5W-30 API SH/CD
Front Axle ................................ SAE 80W-90 API GL-5
Rear Axle ................................. SAE 80W-90 API GL-5
Rear Axle (Trac-Lok) ( 2) ................. SAE 80W-140 API GL-5
Rear Axle (Trailer Towing) ( 3) .......... SAE 75W-140 Synthetic
Hydraulic Clutch .............. DOT 3 (SAE J-1703F) Brake Fluid
Manual Transmission ....................... SAE 75W-90 API GL-5
Manual Steering Box .............. Multi-Purpose NLGI Grade 2EP
Power Steering Pump ...................... Power Steering Fluid
Transfer Case .................................. Dexron-IIE ATF

Brake Caliper Bushings ....... GE 661 or DOW 111 Silicone Grease
Caliper Slide Pins .......... GE 661 or DOW 111 Silicone Grease
Wheel Bearings ............ Multi-Purpose NLGI Grade 2EP, GC-LB
Drive Shaft U-Joints ...... Multi-Purpose NLGI Grade 2EP, GC-LB
Steering Linkage (4)( 5) ... Multi-Purpose NLGI Grade 2EP, GC-LB
Ball Joints ( 4)( 6) ........ Multi-Purpose NLGI Grade 2EP, GC-LB
Engine Oil Filter (Diesel) ( 7) .... AMC/Jeep (P/N 8983 002 656)
Weatherstrip ......................... Silicone Spray Lubricant
( 1) - SAE 10W-30 SH/CD is preferred.
( 2) - Add 2 Ozs. (59 ml) of Limited-Slip differential lubricant
additive when changing fluid.
( 3) - For vehicles operating under heavy-duty towing conditions,
use SAE 75W-140 Synthetic lube.
NOTE: Before using SAE 75W-140 Synthetic the old fluid must be
DRAINED and FLUSHED with clean mineral based (non-synthetic)
axle lubricant. Then refill with new synthetic lube.
( 4) - Use low pressure grease gun to prevent seal damage.
( 5) - Fill until lubricant squeezes out from the base of seals.
( 6) - Fill ball joint until seal starts to swell.
( 7) - Use of AMC/Jeep Oil Filter is RECOMMENDED.









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FLUID CAPACITIES
FLUID CAPACITIES TABLE








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Application Quantity ( 1)
A/C System R-12 Refrigerant Capacity ............... 36-40 Ozs.
Automatic Transmission
1984-86 (904 HD)
Fluid Change .............................. 4.0 Qts. (3.8L)
Overhaul (Dry Fill) ....................... 8.0 Qts. (7.6L)
1987-88
Fluid Change .............................. 4.0 Qts. (3.8L)
Overhaul (Dry Fill) ....................... 8.5 Qts. (8.0L)
Cooling System ( 2)
4-Cylinder ................................. 10.0 Qts. (9.5L)
6-Cylinder ................................ 12.0 Qts. (11.4L)
4-Cylinder Turbo Diesel (1985-87) ........... 9.0 Qts. (8.5L)
Engine Oil
4-Cylinder .................................. 4.0 Qts. (3.8L)
6-Cylinder .................................. 6.0 Qts. (5.7L)
4-Cylinder Turbo Diesel (1985-87) ........... 5.5 Qts. (8.5L)
Fuel Tank
Standard ................................. 13.5 Gals. (51.1L)
Optional ................................... 20 Gals. (75.7L)
Manual Transmission ( 3)
AX4 (AISIN) ................................. 7.4 Pts. (3.5L)
T4 (Borg-Warner) ............................ 3.9 Pts. (1.8L)
AX5 (AISIN) ................................. 7.0 Pts. (3.3L)
T5 (Borg-Warner) ............................ 4.5 Pts. (2.1L)
Transfer Case
1985-86
Selec-Trac (229 Full-Time) ................ 6.0 Pts. (2.8L)
Command-Trac (Part-Time 207) .............. 4.5 Pts. (2.1L)
1987
Selec-Trac ................................ 2.5 Pts. (1.2L)
Command-Trac .............................. 2.2 Pts. (1.0L)
1988
Selec-Trac ................................ 3.0 Pts. (1.4L)

result in hard starting.
Fig. 2: Typical PCV Valve & Airflow
When engine is started, manifold vacuum pulls valve open
against spring pressure. As long as there is engine vacuum, the valve
floats, permitting crankcase fumes to enter intake manifold.
A baffle in rocker arm cover prevents oil from being drawn
into intake manifold through ventilator valve.
If the engine backfires, the ventilator valve will close.
This will prevent ignition of fumes in crankcase.
During certain engine operations, more blow-by is created
than ventilator valve can handle. Excess blow-by is returned to air
cleaner and carburetor through rocker arm cover and breather
assembly. It is then burned in the combustion chamber.
A breather assembly acts as separator to keep oil from being
drawn into air cleaner during this operation.
CCV SYSTEM
As stated above, the CCV system performs the same function
as a conventional PCV system, but does not use a vacuum controlled
valve.
A molded vacuum tube connects manifold vacuum to a grommet on
top of the cylinder head cover at the dash panel end. The grommet
contains a metered orifice of a calibrated size that meters the amount
of crankcase vapors drawn out of the engine. A fresh air supply hose
from the air cleaner is also connected to the front of the cylinder
head cover on 4.0L engines and to the rear of the cover on 2.5L
engines.
When the engine is operating, fresh air enters the engine
and mixes with crankcase vapors. Manifold vacuum draws the
vapor/air mixture through the metered orifice and into the intake
manifold. The vapors are consumed during combustion.

To test crankcase ventilation system, start engine and allow
it to reach normal operating temperature. Make sure engine is idling
at normal curb idle, and perform following checks:
1) Remove PCV valve from its mounting. If valve is
functioning properly, hissing noise will be heard as air passes
through it. Strong vacuum should be felt when your finger is placed
over valve inlet.
2) While finger is over inlet, check for presence of vacuum
leaks in hose line and at all connections. Reinstall PCV valve,
remove crankcase air inlet hose at air cleaner.
3) Loosely hold piece of stiff paper over opening at end of
inlet hose. Paper should be sucked against hose opening with
noticeable force after sufficient time has elapsed for crankcase
pressure to lower (usually about a minute). For final check, stop
engine, remove PCV valve and shake it. Metallic clicking noise should
be heard, indicating valve is free.
4) If system passes both engine running and stopped tests,
it is functioning properly. No further tests are required. If it has
failed either test, replace appropriate components and retest. If it
does not pass on second try, clean system.
MAINTENANCE
Engine may idle slow or rough due to clogged ventilator
valve or system. Therefore, never adjust carburetor idle without
first checking valve and system.
If ventilator valve or system becomes clogged, all crankcase
ventilation will stop, and serious engine damage could result.
Although following manufacturers' service procedures give
specific intervals, it is recommended the crankcase ventilation
system be checked more frequently if vehicle is operated under severe
conditions (extreme dust, prolonged idling, trailer hauling or short
trips in cold weather).
PCV VALVE
Replace PCV valve every 30,000 miles. Valve is located on
rocker arm cover of 4-cylinder, 6-cylinder and V6 models and on
intake manifold of V8 models.
FILTER ELEMENT
Clean filter element every 30,000 miles. Filter is located
inside air cleaner of 4-cylinder, 6-cylinder and V6 models and in oil
filler cap of V8 models.

 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 

Drive Axles ................................ SAE 75W-90 API GL-5 

Drive Axles (Trac-Lok) (
2) ................ SAE 80W-140 API GL-5 

Drive Axles (Trailer Towing) .............. SAE 80W-140 API GL-5 

Hydraulic Clutch ............... DOT 3 (SAE J-1703F) Brake Fluid 

Manual Transmission ........................ SAE 75W-90 API GL-5 

Parking Brake Cable Guides ................. NLGI Grade 2, GC-LB 

Door & Hood Hinges ............................ Light Engine Oil 

Manual Steering Box ............... Multi-Purpose NLGI Grade 2EP 

Power Steering Pump ....................... Power Steering Fluid 

Transfer Case ................................... Dexron-IIE ATF 

Brake Caliper Bushings ........ GE 661 or DOW 111 Silicone Grease 

Caliper Slide Pins ........... GE 661 or DOW 111 Silicone Grease 

Wheel Bearings .................. Multi-Purpose NLGI Grade GC-LB 

Drive Shaft U-Joints .............. Multi-Purpose NLGI Grade 2EP 

Steering Linkage (
4)( 5) .................... NLGI Grade 2, GC-LB 

Ball Joints (
4)( 6) ......................... NLGI Grade 2, GC-LB 

Weatherstrip .......................... Silicone Spray Lubricant 

Wheel Lug Nut Torque ...................... 95 ft. lbs. (129 N.m) 



(
1) - SAE 10W-30 SH/CD is preferred. 

(
2) - Add 4 ozs. (118 ml) of Limited-Slip differential lubricant 

additive when changing fluid. 

(
3) - For vehicles operating under heavy-duty towing conditions, 

use SAE 75W-140 Synthetic lube. 

NOTE: Before using SAE 75W-140 Synthetic the old fluid must 

be DRAINED and FLUSHED with clean mineral based axle 

lubricant. Then refill with new synthetic lube. 

(
4) - Use low pressure grease gun to prevent seal damage. 

(
5) - Fill until lubricant squeezes out from the base of seals. 

(
6) - Fill ball joint until seal starts to swell. 










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Fluid Capacities 










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Application ( 1) Quantity 



Automatic Transmission 

1984-86 (904 HD) 

Fluid Change ............................... 4.0 Qts. (3.8L) 

Overhaul (Dry Fill) ........................ 8.0 Qts. (7.6L) \


1987-88 

Fluid Change ............................... 4.0 Qts. (3.8L) 

Overhaul (Dry Fill) ........................ 8.5 Qts. (8.0L) \


Cooling System (
2) 

4-Cylinder .................................. 10.0 Qts. (9.5L) 

6-Cylinder ................................. 12.0 Qts. (11.4L) 

Engine Oil 

4-Cylinder ................................... 4.0 Qts. (3.8L) 

6-Cylinder ................................... 6.0 Qts. (5.7L) 

Fuel Tank 

Standard .................................. 13.5 Gals. (51.1L) 

Optional .................................... 20 Gals. (75.7L) 

Manual Transmission (
3) 

AX4 (AISIN) .................................. 7.4 Pts. (3.5L) \


T4 (Borg-Warner) ............................. 3.9 Pts. (1.8L) \