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1. CHRYSLER
CORPORATION
SERVICE MANUAL and SUPPLEMENT
1993 JEEPT
GRAND CHEROKEE
GRAND WAGONEER
To order the special service tools used and
illustrated, please refer to the instructions on
inside back cover.
NO PART OF THIS PUBLICATION MAY BE
REPRODUCED, STORED IN A RETRIEVAL
SYSTEM, OR TRANSMITTED, IN ANY FORM
OR BY ANY MEANS, ELECTRONIC, ME-
CHANICAL, PHOTOCOPYING, RECORDING,
OR OTHERWISE, WITHOUT THE PRIOR
WRITTEN PERMISSION OF CHRYSLER
CORPORATION.
Chrysler Corporation reserves the right to make changes in design or to make
additions to or improvements in its products without imposing any obligations
upon itself to install them on its products previously manufactured.
Litho in U.S.A. Copyright © 1992 Chrysler Corporation 10M0792
NEXT PAGE ©

2. FOREWORD
The information contained in this service manual has been prepared for the professional automotive
technician involved in daily repair operations. This manual does not cover theory of operation, which is
addressed in service training material.
Tightening torques are provided as a specific value throughout this manual. This value represents the
midpoint of the acceptable engineering torque range for a given fastener application. These torque values are
intended for use in service assembly and installation procedures using the correct OEM fasteners. When
replacing fasteners, always use the same type (part number) fastener as removed.
Information in this manual is divided into groups. These groups contain general information, diagnosis,
testing, adjustments, removal, installation, disassembly, and assembly procedures for the components.
The Component and System Index of this manual identifies the correct group for the component or system
to be serviced. In addition, a Service Manual Comment form is included at the rear of this manual. Use the
form to provide Chrysler Corporation with your comments and suggestions.
To assist in locating a group title page, use the Group Tab Locator on the following page. The solid bar after
the group title is aligned to a solid tab on the first page of each group. The first page of the group has a contents
section that lists major topics within the group.
Chrysler Corporation reserves the right to change testing procedures, specifications, diagnosis, repair
methods, or vehicle wiring at any time without prior notice or incurring obligation.
Information describing the operation and use of standard and optional equipment is included in the
Owner’s Manual provided with the vehicle.
NOTE: The acronyms, terminology and nomenclature used to identify emissions related components in this
manual may have changed from prior publications. These new terms are in compliance with S.A.E.
recommended practice J1930. This terminology standard (J1930) is required to comply with the 1993
California Air Research Board (CARB) requirements.
NEXT PAGE ©

3. NOTE: Groups with the suffix “-S” are supplements to
the original service manual publication.
GROUP TAB LOCATOR PAGE
IN Introduction
0 Lubrication and Maintenance
2 Front Suspension and Axle
3 Rear Suspension and Axles
5 Brakes
6 Clutch
7 Cooling System
8 Electrical
9 Engines
11 Exhaust System and Intake Manifold
13 Frame and Bumpers
14 Fuel System
16 Propeller Shafts
19 Steering
21 Transmissions and Transfer Cases
21-S Transmissions and Transfer Cases
22 Wheels and Tires
23 Body Components
24 Heating and Air Conditioning
25 Emission Control Systems
Index
Index Supplement
Service Manual Comment Forms (Rear of Manual)

4. INTRODUCTION
CONTENTS
page page
DESIGNATIONS, LABELS/PLATES/DECALS,
CODES AND DIMENSIONS/WEIGHTS . . . . . . . 1
MEASUREMENT AND TORQUE
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . 5
DESIGNATIONS, LABELS/PLATES/DECALS, CODES AND DIMENSIONS/WEIGHTS
INDEX
page page
Body Code Plate . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Engine and Transmission/Transfer Case
Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
International Vehicle Control and Display Symbols . 4
Major Component Identification . . . . . . . . . . . . . . . 2
Trailer Towing Specifications . . . . . . . . . . . . . . . . . . 4
Vehicle Designation . . . . . . . . . . . . . . . . . . . . . . . . 1
Vehicle Dimension . . . . . . . . . . . . . . . . . . . . . . . . . 3
Vehicle Identification Number (VIN) Plate . . . . . . . . 1
Vehicle Safety Certification Label . . . . . . . . . . . . . . 1
Vehicle Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
VEHICLE DESIGNATION
The Vehicle Code Designation for Grand Cherokee
vehicles is ZJ. The code is used to identify the vehicle
in charts, captions and in service procedures. The
vehicle code is different than the Vehicle Identifica-
tion Number (VIN) or the wheelbase/model code.
VEHICLE SAFETY CERTIFICATION LABEL
A certification label is attached to the left side
B-pillar (Fig. 1). The label certifies that the vehicle
conforms to Federal Motor Vehicle Safety Standards
(FMVSS).The label also lists the:
• Month and year of vehicle manufacture
• Gross Vehicle Weight Rating (GVWR). The gross
front and rear axle weight ratings (GAWR’s) are
based on a minimum rim size and maximum cold tire
inflation pressure
• Vehicle Identification Number (VIN)
• Type of vehicle
• Type of rear wheels
• Bar code
• Month, Day and Hour (MDH) of final assembly
VEHICLE IDENTIFICATION NUMBER (VIN) PLATE
The Vehicle Identification Number (VIN) plate is
attached to the top left side of the instrument panel.
The VIN contains 17 characters that provide data
concerning the vehicle. Refer to the decoding chart to
determine the identification of a vehicle.
The Vehicle Identification Number is also imprinted
on the:
• Body Code Plate
• Equipment Identification Plate
• Vehicle Safety Certification Label
• Frame rail
BODY CODE PLATE
A metal Body Code plate is attached (riveted) to the
top, left side of the radiator reinforcement. There can
be a maximum of seven rows of vehicle information
imprinted on the plate. The information should be
read from left to right, starting with line 1 at the
bottom of the plate up to line 7 (as applicable) at the
top of the code plate (Fig.2).
Refer to the decoding chart to decode lines 1
through 3.
Fig. 1 Vehicle Safety Certification Label
Z INTRODUCTION 1

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6. Lines 4 through 7 on the plate are imprinted in
sequence according to the following descriptions:
• 3-character sales code
• 3-digit numerical code
• 6-digit SEC code
If there is not enough space left in the row for all of
the 6-digit SEC code:
• The unused space will remain blank
• The code will be listed in the next row.
The last nine positions of row 7 will contain a
2-digit code and a 6-digit serial number.
The last code on a body code plate will be followed
by the imprinted word END. When two plates are
required, the last available spaces on the first plate
will be imprinted with the letters CTD (for contin-
ued).
When a second body code plate is necessary, the
first four spaces on each row will not be used because
of the plate overlap.
ENGINE AND TRANSMISSION/TRANSFER CASE
IDENTIFICATION
Refer to Group 9—Engines for all engine identifica-
tion data.
Refer to Group 21—Transmissions for all
transmission/transfer case identification data.
MAJOR COMPONENT IDENTIFICATION
Refer to the applicable group for identification data.
VEHICLE IDENTIFICATION NUMBER (VIN) DECODING
Fig. 2 Body Code Plate
BODY CODE DECODING
2 INTRODUCTION Z

7. VEHICLE DIMENSION
The Vehicle Dimension chart provides the dimen-
sions for each type of Grand Cherokee vehicle.
VEHICLE WEIGHTS
The Vehicle Weights chart provides:
• The Gross Vehicle Weight Rating (GVWR),
• The payload
• The curb weight for each vehicle type/wheelbase
VEHICLE DIMENSIONS
VEHICLE WEIGHTS
Z INTRODUCTION 3

8. TRAILER TOWING SPECIFICATIONS
The Trailer Towing Specifications chart provides:
• The maximum trailer tongue weight
• The maximum trailer weight
• The maximum combined weight of the
trailer/load/towing vehicle with a specific
engine/transmission/axle combination.
INTERNATIONAL VEHICLE CONTROL AND DISPLAY
SYMBOLS
The graphic symbols illustrated in the following
chart are used to identify various instrument con-
trols. The symbols correspond to the controls and
displays that are located on the instrument panel.
TRAILER TOWING SPECIFICATIONS
INTERNATIONAL CONTROL AND DISPLAY SYMBOLS
4 INTRODUCTION Z

9. MEASUREMENT AND TORQUE SPECIFICATIONS
INDEX
page page
Metric and English/Sae Conversion . . . . . . . . . . . . 5
Specification Notations . . . . . . . . . . . . . . . . . . . . . . 5
Torque Specifications . . . . . . . . . . . . . . . . . . . . . . . 5
SPECIFICATION NOTATIONS
WARNING: THE USE OF INCORRECT ATTACHING
HARDWARE CAN RESULT IN COMPONENT DAM-
AGE AND/OR PERSONAL INJURY.
It is important to retain the original attaching
hardware for assembly of the components. If the at-
taching hardware is not reusable, hardware with
equivalent specifications must be used.
METRIC AND ENGLISH/SAE CONVERSION
The following chart will assist in converting metric
units to equivalent English and SAE units, or vise
versa.
TORQUE SPECIFICATIONS
TORQUE CHARTS
A torque chart for fasteners is provided at the end
of each group (of service information). Refer to the
Standard Torque Specifications chart to determine
torque values not listed in the group (Figs. 1 and 2).
It is important to be aware that the torque values
listed in the chart are based on clean and dry bolt
threads. Reduce the torque value by 10 percent when
the bolt threads are lubricated and by 20 percent if
new.
CONVERSION FORMULAS AND EQUIVALENT VALUES
STANDARD TORQUE SPECIFICATIONS
Z INTRODUCTION 5

10. BOLT THREAD AND GRADE/CLASS IDENTIFI-
CATION
THREAD IDENTIFICATION
SAE and metric bolt/nut threads are not the same.
The difference is described in the Thread Notation
chart.
GRADE/CLASS IDENTIFICATION
The SAE bolt strength grades range from grade 2 to
grade 8. The higher the grade number, the greater
the bolt strength. Identification is determined by the
line marks on the top of each bolt head (Fig. 1). The
actual bolt strength grade corresponds to the number
of line marks plus 2.
• A grade 2 bolt has no line marks on top of the bolt
head
• A grade 5 bolt has 3 line marks on top of the bolt
head
• A grade 7 bolt has 5 line marks on top of the bolt
head
• A grade 8 bolt has 6 line marks on top of the bolt
head
The most commonly used metric bolt strength
classes are 9.8 and 12.9. The metric strength class
identification number is imprinted on the head of the
bolt (Fig. 2). The higher the class number, the greater
the bolt strength. Some metric nuts are imprinted
with a single-digit strength class on the nut face.
METRIC CONVERSION
Refer to the Metric Conversion chart to convert
torque values listed in metric Newton-meters (NIm).
Also, use the chart to convert between millimeters
(mm) and inches (in.)
Fig. 1 SAE Bolt Grade Identification
Fig. 2 Metric Bolt Class Identification
THREAD NOTATION—SAE AND METRIC
6 INTRODUCTION Z

11. METRIC CONVERSION
Z INTRODUCTION 7

12. LUBRICATION AND MAINTENANCE
CONTENTS
page page
CHASSIS AND BODY . . . . . . . . . . . . . . . . . . . . 21
DRIVETRAIN . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
ENGINE MAINTENANCE . . . . . . . . . . . . . . . . . . 11
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . 1
GENERAL INFORMATION
INDEX
page page
Classification of Lubricants . . . . . . . . . . . . . . . . . . . 2
Components Requiring No Lubrication . . . . . . . . . . 3
Fuel Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Lubrication and Replacement Parts
Recommendation . . . . . . . . . . . . . . . . . . . . . . . . 3
Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . 2
Starting Assistance (Jump Starting) . . . . . . . . . . . . 7
Vehicle Lifting Recommendations . . . . . . . . . . . . . . 8
Vehicle Towing Recommendations . . . . . . . . . . . . . 9
INTRODUCTION
Lubrication and maintenance is divided into re-
quired and recommended service tasks. The required
service tasks must be completed to verify emission
controls function correctly. The recommended service
tasks should be completed to maintain safety and
durability.
This information will assist service personnel in
providing maximum protection for each owner’s ve-
hicle.
Conditions can vary with individual driving habits.
It is necessary to schedule maintenance as a time
interval as well as a distance interval.
It is the owner’s responsibility to determine appli-
cable driving condition. Also to have vehicle serviced
according to the maintenance schedule, and to pay for
necessary parts and labor.
Vehicles with a Gross Vehicle Weight Rating
(GVWR) of 3 855 kg (8,500 lbs.) or less must conform
to light duty emission standards. Vehicles with a
Gross Vehicle Weight Rating (GVWR) of 3 856 kg
(8,501 lbs.) or more must conform to heavy duty emis-
sion standards.
The GVWR for each vehicle is listed on the Safety
Certification Label. This label is affixed to driver side
door pillar (Fig. 1).
Additional maintenance and lubrication informa-
tion is listed in the Owner’s Manual.
SEVERE DRIVING CONDITIONS
Vehicles subjected to severe driving conditions
should decrease the interval between component
maintenance. Severe driving conditions are defined
as:
• Frequent short trip driving less than 24 km (15
miles)
• Frequent driving in dusty conditions
• Trailer towing
• Extensive engine idling
• Sustained high speed operation
• Desert operation
• Frequent starting and stopping
• Cold climate operation
Fig. 1 Vehicle Safety Certification Label
Z LUBRICATION AND MAINTENANCE 0 - 1

13. • Commercial service
When a vehicle is continuously subjected to severe
driving conditions, lubricate:
• Body components
• All driveline coupling joints
• Steering linkage
More often than normal driving conditions
DUSTY AREAS
With this type of severe driving condition, special
care should be given to:
• Engine air cleaner filter
• PCV filter
• Crankcase ventilation system
• Brake booster control valve air filter.
OFF-ROAD (4WD) OPERATION
After off-road (4WD) operation, inspect underside of
vehicle. Inspect:
• Tires
• Body structure
• Steering components
• Suspension components
• Exhaust system
• Threaded fasteners
HARSH SURFACE ENVIRONMENTS
After long operation in harsh environments, brake
drums, brake linings, and rear wheel bearings should
be inspected and cleaned.
ROUTINE MAINTENANCE
The following routine maintenance is recommended
on a monthly basis:
TIRES—Inspect tires for unusual wear/damage.
BATTERY—Inspect and clean terminals. Determine
acid level and add distilled water, if necessary.
FLUIDS—Determine if component fluid levels are
acceptable. Add fluid, if necessary.
LIGHTS/ELECTRICAL—Test all electrical systems
in vehicle for proper operation.
It is also recommended that engine oil and washer
fluid level be determined at each fuel fill-up.
FUEL REQUIREMENTS
GASOLINE ENGINES
All engines require use of unleaded gasoline to re-
duce harmful effects of lead to the environment. Also
unleaded fuel is necessary to prevent damage to the
catalytic converter/O2 sensor. Fuel must have a mini-
mum octane rating of 87.
CAUTION: UNLEADED FUEL ONLY must be used in
vehicles equipped with a catalyst emission control
system. All vehicles have reminders printed on the
instrument panel below fuel gauge and on fuel filler
door. Vehicles also have fuel filler tubes that are
specially designed to accept only small-diameter
nozzles.
CLASSIFICATION OF LUBRICANTS
Lubricating fluids and chassis lubricants are classi-
fied according to standards recommended by:
• Society of Automotive Engineers (SAE)
• American Petroleum Institute (API)
• National Lubricating Grease Institute (NLGI)
ENGINE OIL (FIG. 2)
SAE VISCOSITY GRADE
An SAE viscosity grade is used to specify viscosity
of engine oil. SAE 30 specifies a single viscosity en-
gine oil.
Engine oils also have multiple viscosities. These are
specified with a dual SAE viscosity grade which indi-
cates cold-to-hot temperature viscosity range.
API SERVICE GRADE
The API Service Grade specifies the type of perfor-
mance engine oil is intended to provide. API Service
Grade specifications also apply to energy conserving
engine oils.
Conformance to API Service Grade specifications is
determined by tests that measure ability of an oil to
control:
• Engine wear
• Bearing corrosion
• Sludge
• Varnish
• Oil thickening
• Rust
• Piston deposits
For maximum gasoline engine protection, use API
Service Grade SG, SG/CD or SG/CE engine oil.
Fig. 2 SAE Oil Viscosity Grade & API Service Grade
0 - 2 LUBRICATION AND MAINTENANCE Z

14. GEAR LUBRICANTS
A dual grade is also used to specify viscosity of
multi-purpose gear lubricants.
API grade designation identifies gear lubricants in
terms of recommended usage.
MopartSynthetic Gear lube is required for use in
vehicles with a trailer towing package.
CHASSIS COMPONENT AND WHEEL BEARING
LUBRICANTS
Chassis and wheel bearing lubricants that are rec-
ommended are identified by the NLGI Certification
Symbol. The symbol contains a coded designation.
This identifies usage and quality of the lubricant.
The letter G within the symbol designates wheel
bearing lubricant. The letter L designates chassis
lubricant. When the letters are combined, the lubri-
cant can be used for dual applications.
LUBRICATION AND REPLACEMENT PARTS REC-
OMMENDATION
Jeeptvehicles are engineered to provide many years
of dependable operation. However, lubrication service
and maintenance are required for each vehicle. When
necessary, MOPARtbrand lubricants and genuine re-
placement parts are highly recommended. Each
MOPARtbrand lubricant and replacement part is de-
signed and to provide dependability and long service
life.
COMPONENTS REQUIRING NO LUBRICATION
There are many components that should not be
lubricated. The components that should not be lubri-
cated are:
• Generator bearings
• Brake booster cylinder
• Distributors
• Drive belts
• Drive belt idler pulleys
• Idler arms
• Rubber bushings
• Starter motor bearings
• Suspension strut bearings
• Rear wheel bearings
• Throttle control cables
• Throttle linkage ball joints
• Water pump bearings
Fig. 3 NLGI Lubricant Container
Certification/Identification Symbol
Z LUBRICATION AND MAINTENANCE 0 - 3

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