1988 JEEP CHEROKEE maintenance schedule

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Page 348 of 1378

JEEP CHEROKEE 1988 Service Repair Manual CO OLIN G S YSTE M S PEC IF IC ATIO NS

1988 J e ep C hero ke e
1988 ENGINE COOLING
Jeep Cooling System Specifications
Cherokee, Comanche, Wagoneer, Wrangler, Grand W

Page 593 of 1378

JEEP CHEROKEE 1988 Service Repair Manual Chrysler Corporation has determined that some 1989 and 1990 Jeep
Cherokee, Comanche and Wrangler vehicles equipped with a 2.5L engine,
may be in violation of Federal Emissions Standards.
The Problem i

Chrysler Corporation has determined that some 1989 and 1990 Jeep
Cherokee, Comanche and Wrangler vehicles equipped with a 2.5L engine,
may be in violation of Federal Emissions Standards.
The Problem is... The oxygen sensor and catalytic convener on your
vehicle (identified on the enclosed form), may be
susceptible to failure. This could result in
hydrocarbon (HC), carbon monoxide (CO) and oxides
of nitrogen (NOx) emission levels above the
allowable limits, which were established to protect
the public health from the dangers of air pollution.
What you must do... * Simply contact your Jeep dealer to schedule
a service appointment. Ask the dealer to hold
parts for your vehicle or order them prior to
your appointment.
* Bring the enclosed Owner Notification Form with
you to your dealer. It tells the dealer what
service is required for your vehicle.
What Chrysler and Chrysler will repair your vehicle free of charge
your dealer will do... (parts and labor). To do this, your dealer will
replace the oxygen sensor and catalytic
converter. The service will take about one hour
but additional time may be required depending on
how service work is scheduled and processed.
If you need help... If you have trouble getting your vehicle
repaired, please call the Chrysler Customer
Center, toll free, at 1-800-853-1403.
A representative will assist you in getting your
vehicle repaired. If you are still unable to
obtain the repair as described in this letter
within a reasonable time, you may also contact
the Manufacturers Operations Division of the
Environmental Protection Agency (6405J), 401 M
Street, S.W., Washington, D.C. 20460.
In order to ensure your full protection under the emission warranty
made applicable to your vehicle under Federal law, and your right to
participate in future recalls, it is recommended that you have your
vehicle serviced as soon as possible. Failure to do so could legally
be determined to be a lack of proper maintenance of your vehicle.
Further, without this repair your vehicle may fail a state or local
emission inspection test.
We're sorry for any inconvenience, but trust that you understand our
interest in clean air and your continuing satisfaction with our
product. Thanks for your attention to this important matter.
Customer Services Field Operations
Chrysler Corporation

Page 648 of 1378

JEEP CHEROKEE 1988 Service Repair Manual Engine pre-oiling can be done using pressure oiler (if
available). Connect pressure oiler to cylinder block oil passage
such as oil pressure sending unit. Operate pressure oiler long enough
t

Engine pre-oiling can be done using pressure oiler (if
available). Connect pressure oiler to cylinder block oil passage
such as oil pressure sending unit. Operate pressure oiler long enough
to ensure correct amount of oil has filled crankcase. Check oil level
while pre-oiling.
If pressure oiler is not available, disconnect ignition
system. Remove oil pressure sending unit and replace with oil pressure
test gauge. Using starter motor, rotate engine starter until gauge
shows normal oil pressure for several seconds. DO NOT crank engine
for more than 30 seconds to avoid starter motor damage.
Ensure oil pressure has reached the most distant point from
the oil pump. Reinstall oil pressure sending unit. Reconnect ignition
system.
INITIAL START-UP
Start the engine and operate engine at low speed while
checking for coolant, fuel and oil leaks. Stop engine. Recheck coolant
and oil level. Adjust if necessary.
CAMSHAFT
Break-in procedure is required when a new or reground
camshaft has been installed. Operate and maintain engine speed between
1500-2500 RPM for approximately 30 minutes. Procedure may vary due to
manufacturers recommendations.
PISTON RINGS
Piston rings require a break-in procedure to ensure seating
of rings to cylinder walls. Serious damage may occur to rings if
correct procedures are not followed.
Extremely high piston ring temperatures are produced obtained
during break-in process. If rings are exposed to excessively high RPM
or high cylinder pressures, ring damage can occur. Follow piston ring
manufacturer's recommended break-in procedure.
FINAL ADJUSTMENTS
Check or adjust ignition timing and dwell (if applicable).
Adjust valves (if necessary). Adjust carburetion or injection idle
speed and mixture. Retighten cylinder heads (if required). If
cylinder head or block is aluminum, retighten bolts when engine is
cold. Follow the engine manufacturer's recommended break-in procedure
and maintenance schedule for new engines.
NOTE: Some manufacturer's require that head bolts be retightened
after specified amount of operation. This must be done to
prevent head gasket failure.

Page 902 of 1378

JEEP CHEROKEE 1988 Service Repair Manual 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
* PLEA

Page 903 of 1378

JEEP CHEROKEE 1988 Service Repair Manual 5 - Transmission/(Transfer Case)
A * Auto Column Shift (2WD)
B * Auto Floor Shift (Part Time 4WD)
C * Auto Floor Shift (Full Time 4WD)
D * Auto Floor Shift (2WD)
E * Auto Colum

Page 904 of 1378

JEEP CHEROKEE 1988 Service Repair Manual * Cold Climate Operation
* Towing Or Heavily Loading
* Severe Dust Conditions
* Sustained High Speed Operation
* Off-Road Driving
* Hot Weather, Stop-And

* Cold Climate Operation
* Towing Or Heavily Loading
* Severe Dust Conditions
* Sustained High Speed Operation
* Off-Road Driving
* Hot Weather, Stop-And-Go Driving
* Extensive Idling Conditions (Taxi Or Delivery Type Service)
Normal Service
* Driven More Than 10 Miles Daily
* No Severe Service Operating Conditions
CAMSHAFT TIMING BELT REPLACEMENT INFORMATION (TURBO-DIESEL)
CAUTION: Failure to replace a faulty camshaft timing belt may result
in serious engine damage.
The condition of camshaft drive belts should always be
checked on vehicles which have more than 50,000 miles. Although some
manufacturers do not recommend belt replacement at a specified
mileage, others require it at 60,000-100,000 miles. A camshaft drive
belt failure may cause extensive damage to internal engine components
on most engines, although some designs do not allow piston-to-valve
contact. These designs are often called "Free Wheeling".
Many manufacturers changed their maintenance and warranty
schedules in the mid-1980's to reflect timing belt inspection and/or
replacement at 50,000-60,000 miles. Most service interval schedules
reflect these changes.
Belts or components should be inspected and replaced if any
of the following conditions exist:
* Cracks Or Tears In Belt Surface
* Missing, Damaged, Cracked Or Rounded Teeth
* Oil Contamination
* Damaged Or Faulty Tensioners
* Incorrect Tension Adjustment
SERVICE LABOR TIMES
SERVICE LABOR TIMES TABLE (HOURS)\
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( 1) 30,000 60,000
Application Mile Service Mile Service
2.1L (Turbo Diesel)
Automatic Transmission ........... 4.3 ................ 4.5
Manual Transmission .............. 3.6 ................ 3.8
2.5L
Automatic Transmission ........... 5.6 ................ 3.5
Manual Transmission .............. 4.9 ................ 3.5
2.8L
Automatic Transmission ........... 5.8 ................ 3.7
Manual Transmission .............. 5.1 ................ 3.7
4.0L
Automatic Transmission ........... 5.7 ................ 3.6
Manual Transmission .............. 5.0 ................ 3.6
( 1) - Add .8 hr. for vehicles equipped with 4WD.
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Page 917 of 1378

JEEP CHEROKEE 1988 Service Repair Manual WARNING: DO NOT USE starting fluids (ether) or flammable liquids to
aid the starting of a Cummins Turbo-Diesel. NEVER pour diesel
fuel, flammable liquids or starting fluids into the

WARNING: DO NOT USE starting fluids (ether) or flammable liquids to
aid the starting of a Cummins Turbo-Diesel. NEVER pour diesel
fuel, flammable liquids or starting fluids into the air
cleaner canister, air intake or turbocharger housing in an
attempt to start the vehicle. A flash fire may result causing
personal injury.
TRANSFER CASE
CAUTION: Both drive axles are disengaged when transmission gear is
in Neutral position. Always set parking brake when leaving
vehicle unattended.
CAUTION: Never attempt to engage Low range when vehicle is moving
faster than 2-3 MPH (3-5 KM/H). Transfer case damage may
result.
GASOLINES CONTAINING ALCOHOL
CAUTION: Exclusive use of gasohol is not recommended. Vehicle test
results have shown that significant fuel system corrosion
can result when gasohol is used exclusively. Fuel additives
which are now being sold as octane enhancers are not
recommended. Most of these products contain high
concentrations of methanol.
WARRANTY INFORMATION
CAUTION: Due to the different warranties offered in various regions
and the variety of after-market extended warranties
available, please refer to the warranty package that came
with the vehicle to verify all warranty options.
BASIC NEW CAR WARRANTY
Jeep Corporation warrants to the original purchaser that the
vehicle is free from defects under normal use and service for 12
months or 12,000 miles, whichever comes first.
POWERTRAIN PROTECTION LIMITED WARRANTY
Begins at 12 months or 12,000 miles and lasts for 7 years or
70,000 miles, whichever comes first. Warranty covers Engine,
Transmission, Transfer Case, and Drive Shaft/Drive Axle(s) for RWD &
4WD.
Items not covered include, normal scheduled maintenance,
tune-ups, clutch adjustments, lack of proper maintenance, and vehicles
on which the mileage cannot readily be determined. A 100.00 deductible
on 2WD models and a 150.00 deductible on 4WD models applies to each
repair visit.
Powertrain Warranty also covers cost of towing to nearest
Jeep Dealer if vehicle cannot be driven due to failure of a covered
powertrain part.
ANTI-CORROSION PERFORATION WARRANTY
Warrants the sheet metal parts of the vehicle against
perforation (rust-through) due to corrosion. It covers any body sheet
metal panel for unlimited mileage during the first 36 months. Outer-
body sheet metal panels are covered for 7 years or 100,000 miles,

Page 947 of 1378

$JEEP CHEROKEE 1988 Service Repair Manual \ \ \ \ \ \ \ EMISSIONS RECALL - OXYGEN SENSOR$

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EMISSIONS RECALL - OXYGEN SENSOR REPLACEMENT
Dear Chrysler Vehicle Owner:
Chrysler Corporation and the Environmental Protection Agency has
determined that the oxygen sensor on certain Cherokee, Wagoneer and
Comanche models may be susceptible to failure. Failure of the oxygen
sensor may cause your vehicle to be in violation of Federal Emissions
Standards. For this reason, we are asking you to return your vehicle,
identified by the Vehicle Identification Number on the enclosed form,
to your dealer for a special service repair. This service will be
provided free of charge.
The needed instructions have been sent to all involved dealers. The
service will not hurt your engine performance or fuel economy. To
obtain this service:
* Contact your Jeep/Eagle dealer as soon as possible to make an
appointment for the free service.
* Take the enclosed Owner Notification Form with you at the time of
your appointment and give it to your dealer. The form identifies
the vehicle and recall for which service is required.
* The dealer will inspect and replace the oxygen sensor if
necessary. The service will take about one-half hour, but
additional time may be required depending on how service
appointments are scheduled and processed.
In order to ensure your full protection under the emission warranty
made applicable to your vehicle under Federal law, and your right to
participate in future recalls, it is recommended that you have your
vehicle serviced as soon as possible. Failure to do so could legally
be determined to be a lack of proper maintenance of your vehicle.
Further, without this repair your vehicle may fail a state or local
emission inspection test.
If you have any problem obtaining the service, please contact the
Chrysler Zone Service Office in your area. (It is listed under
"Service Assistance" in your Owner's Manual.} A Zone representative
will arrange for prompt servicing of your vehicle. If you are still
unable to obtain the repair as described in this letter within a
reasonable time, you may also contact the Manufacturers Operations
Division of the Environmental Protection Agency (6405d), 401 M Street
S. W., Washington, D. C. 20460.
We regret any inconvenience this action may cause, but trust you
understand our interest in clean air and in your continuing
satisfaction with our product. Thank you for your prompt attention to
this important matter.
Customer Services Field Operations
Chrysler Corporation
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COMPLETION REPORTING & REIMBURSEMENT
Claims for vehicles which have been serviced must be submitted on
the DIAL System. Claims submitted will be used by Chrysler to record
recall service completions and provide dealer payments.

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