1988 JEEP CHEROKEE oil pressure
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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)
Page 916 of 1378
ELECTROSTATIC DISCHARGE SENSITIVE (ESD) PARTS
WARNING: Many solid state electrical components can be damaged by
static electricity (ESD). Some will display a warning label,
but many will not. Discharge personal static electricity by
touching a metal ground point on the vehicle prior to
servicing any ESD sensitive component.
ENGINE OIL
CAUTION: Never use non-detergent or straight mineral oil.
CAUTION: Do not use reclaimed fluid, mineral oil, fluid that was
stored in old or open containers, or fluid inferior to AMC
Standard AM 4101. Be sure to handle the fluid in clean
containers that will not introduce even a slight amount of
foreign liquids or particles. Such contamination of fluid
could lead to hydraulic system failure.
ENGINE OIL FILTER (GASOLINE)
CAUTION: Verify that proper Oil Filter is being used. Filters with
metric threads (M20 x 1.5) must be used with some engines.
Other engines use SAE type (3/4" x 16) threads, and must
use an oil filter with these threads. Possible engine damage
can occur with improper oil filter.
ENGINE OIL FILTER (TURBO DIESEL ONLY)
CAUTION: The engine oil filter has METRIC threads. Use of a filter
with improper threads can result in oil leakage and
possible engine damage. Look for thread size symbol M20x1.5
on filter.
FUEL SYSTEM SERVICE
WARNING: DO NOT bleed fuel lines on hot engine, as high exhaust
temperatures could cause fire. Use care when bleeding fuel
lines, as fuel is under extreme pressure and could penetrate
skin, causing personal injury. Wear safety goggles and
protective clothing when bleeding fuel lines.
WARNING: Relieve fuel system pressure prior to servicing any fuel
system component.
HALOGEN BULBS
Halogen bulbs contain pressurized gas which may explode if
overheated. DO NOT touch glass portion of bulb with bare hands. Eye
protection should be worn when handling or working around halogen
bulbs.
RADIATOR CAP
CAUTION: Always disconnect the fan motor when working near the
radiator fan. The fan is temperature controlled and could
start at any time even when the ignition key is in the OFF
position. DO NOT loosen or remove radiator cap when cooling
system is hot.
STARTING FLUID USE (TURBO DIESEL)
Page 930 of 1378
PO W ER S TE ER IN G P U M P
1988 J e ep C hero ke e
1988 STEERING
Jeep Power Steering Pumps - Saginaw Vane-Type
Cherokee, Comanche, Grand Wagoneer, Pickup, Wagoneer,
Wrangler
DESCRIPTION
Saginaw vane-type power steering pump can be identified by
"ham-shaped" fluid reservoir can. Rectangular pumping vanes carried by
a shaft driven rotor move fluid from intake to pressure cavities of
cam ring.
Centrifugal force throws vanes against inside surface of cam
ring to pick up residual oil. As more oil is picked up, it is forced
into cavities of thrust plate, into 2 cross-over holes in cam ring and
pressure plate and into a high pressure area between pressure plate
and housing end plate.
Filling the high pressure area causes oil to flow under vanes
in slots of rotor. This forces vanes to follow inside oval surface of
cam ring. As vanes rotate to small area of cam ring, oil is forced out
from between vanes.
TROUBLE SHOOTING
Refer to TROUBLE SHOOTING - BASIC PROCEDURES article in the
GENERAL TROUBLE SHOOTING section.
LUBRICATION & TESTING
See POWER STEERING GENERAL SERVICING article in the STEERING
section.
REMOVAL & INSTALLATION
POWER STEERING PUMP
Removal & Installation
1) Loosen pump adjusting bolt (or nut) and pump mounting
bolts. Remove pump drive belt. Disconnect pressure and return hoses
from pump. Cap ends to prevent loss of fluid or contamination.
2) Remove pump bracket-to-engine bolts. Remove pump, pulley
and mounting bracket as an assembly. To install, reverse removal
procedure. Bleed system.
OVERHAUL
CAUTION: When clamping pump in vise, be careful not to exert
excessive force on front hub or pump. DO NOT use hammer to
remove pulley.
DISASSEMBLY
1) Drain pump reservoir. Clean exterior of unit. Remove
mounting bracket(s). Using a puller, withdraw pulley from shaft. See
Fig. 1 .
Page 932 of 1378
hammer, tap end of drive shaft to loosen pressure plate, rotor, and
thrust plate assembly from body.
7) Lift pump body off rotor assembly. Flow control valve and
spring should slide out of bore. Remove and discard end plate and
pressure plate "O" rings.
8) Using a screwdriver, pry drive shaft oil seal from body.
Lift pressure plate and cam ring from rotor. Remove rotor vanes.
9) Clamp drive shaft in soft-jawed vise, with rotor and
thrust plate facing up. Remove rotor lock ring from shaft. Use care
not to nick shaft or rotor. Slide rotor and thrust plate off shaft.
Remove shaft from vise.
CLEANING & INSPECTION
1) Clean all pump components (except drive shaft seal) in
clean solvent. Blow dry. Inspect flow control valve assembly for wear,
scoring, burrs or other damage. Inspect seal bore for burrs, nicks, or
score marks that would allow oil to by-pass outer seal surface.
2) Check all machined surfaces of body for scratches or burrs
which might allow leaks. Check "O" ring mating surfaces. Inspect pump
body drive shaft bushing for excessive wear.
3) If replacement is required, replace pump body and bushing
as an assembly. Inspect end cover "O" ring mating surface for nicks
and burrs. Polish with oil stone (if necessary).
4) Inspect rotor ring for roughness or irregularities. Use
oil stone to correct minor irregularities. Replace ring if outside cam
surface is worn or scored. Check thrust plate and pressure plate for
scoring and wear.
5) To remove light scoring, lap with crocus cloth until
surface is smooth and flat. Clean thoroughly. Check that vanes slide
freely but fit snugly into slots.
6) If vanes are loose in slots, replace rotor and/or vanes.
Scoring on rotor may be removed by lapping with crocus cloth. Clean
thoroughly.
REASSEMBLY
1) Lubricate all "O" rings, seals and seal surfaces with
power steering fluid. On Jeeps, lubricate "O" rings with petroleum
jelly. With pump on flat surface, drive new shaft seal in until it
bottoms on bore shoulder.
2) Clamp body in vise with shaft pointing down. Install end
plate and pressure plate "O" rings on body. Install body to reservoir
"O" rings. Install on pump body.
3) Place shaft, splined end up, in soft-jawed vise. Install
thrust plate on shaft with smooth, ported side up. Slide rotor,
counter bore down, over splines.
4) Install new rotor lock ring. Ensure ring is seated in
groove. Install 2 dowel pins into holes in pump cavity. Insert drive
shaft, rotor, and thrust plate assembly into pump cavity. Align
locating holes with dowel pins.
5) Slide cam ring over rotor and onto dowel pins, with arrow
on ring facing toward rear of housing. Install vanes in rotor slots
with radius edge facing out towards cam ring inner surface. Position
pressure plate on dowel pins with circular spring depression facing
rear of housing.
6) Using a 1 1/4" socket in groove of pressure plate, press
down on socket with both thumbs to seat assembly on "O" ring in pump
cavity. Place spring in groove in pressure plate. Place end cover lip
edge over spring.
7) Using thumb or arbor press, press end cover down below
retaining ring groove. Seat retaining ring in groove. Take care to
prevent cocking end cover in bore or distorting assembly.
Page 941 of 1378
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.
Page 943 of 1378
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.
Page 961 of 1378
NORMAL MAINTENANCE SERVICE SCHEDULES
CAUTION: The following service schedules refer to vehicles driven
under normal operating conditions. For vehicles driven under
severe conditions, additional services may be necessary. See
SEVERE SERVICE REQUIREMENTS (PERFORM W/SERVICE SCHEDULES)
above in this article for additional service requirements.
5,000 MILE (8,000 KM) SERVICE
5,000 MILE (8,000 KM) SERVICE \
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Service Or Inspect
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Check Fluid Levels
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Inspect Coolant Hoses and Clamps
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Curb & Fast Idle Speed
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7,500 MILE (12,000 KM) SERVICE
7,500 MILE (12,000 KM) SERVICE \
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Service Or Inspect
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Check Fluid Levels
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Inspect Coolant Hoses and Clamps
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Inspect Brake System
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Inspect Exhaust System
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Inspect Underside of Vehicle (Bolts & Threaded Fasteners)
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Check/Lube Manual Steering Gear
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Lubricate Ball Joints, Steering Linkage & Suspension
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Lube Drive Shaft U-Joints and Slip Splines
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Lube Front Axle Drive Joint and Pivot Bearings (4WD)
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Rotate Tires and Adjust Air Pressure (Including Spare)
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Replace
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Lubrication Specifications
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Application Specification
Page 962 of 1378
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) \