1993 Jeep Cherokee

1993 ENGINE PERFORMANCE

Chrysler Corp. - Service & Adjustment Specifications

Jeep; Cherokee, Grand Cherokee, Grand Wagoneer, Wrangler

INTRODUCTION

Use this article to quickly find specifications related to servicing and on-vehicle adjustments. This is a quick-reference article for when you are familiar with an adjustment procedure and only need a specification.

CAPACITIES

BATTERY SPECIFICATIONS

Application Group Cold Crank Amps @ 0F (-18C)

2.5L 58 390

4.0L

Cherokee 58 475

Grand Cherokee .... 34 600

5.2L 34 600

FLUID CAPACITIES

Application (1) Quantity

Crankcase (2)

2.5L 5.0 Qts. (4.7L)

4.0L 6.0 Qts. (5.7L)

5.2L 5.0 Qts. (4.7L)

Cooling System (Includes Heater) 2.5L

Cherokee 10.0 Qts. (9.5L)

Wrangler 9.0 Qts. (8.5L)

4.0L

Cherokee 12.0 Qts. (11.4L)

Grand Cherokee 9.3 Qts. (8.8L)

Wrangler 10.5 Qts. (9.9L)

5.2L

Grand Cherokee 14.9 Qts. (14.1L)

Automatic Transmission (3)

AW-4 (4) 8.5 Qts. (8.0L)

32RH (4) 8 Qts. (7.6L)

42RE (5) 10.2 Qts. (9.6L)

Manual Transmission (API GL-5 75W-90)

AX-5 (2WD 5-Speed) 7.4 Pts. (3.5L)

AX-5 (4WD 5-Speed) 7.0 Pts. (3.3L)

AX-15 (5-Speed) 6.7 Pts. (3.2L)

Front/Rear Axles (API GL-5 75W-90)

Cherokee (6) 2.5 Pts. (1.2L)

Grand Cherokee (7) (8) 3.0 Pts. (1.4L)

Wrangler (7) (8) 2.5 Pts. (1.2L)

Wrangler (H/D Axle) (5) (6) 3.0 Pts. (1.4L)

Transfer Case (Mercon or Dexron-II) Command-Trac 231

Except Wrangler 2.2 Pts. (1.0L)

Wrangler 3.3 Pts. (1.5L)

Model 249 3.0 Pts. (1.4L)

Selec-Trac 242 3.0 Pts. (1.4L)

  1. - Fluid capacities listed are approximate. Always fill to FULL
    mark.

  2. - Includes oil filter.

  3. - Drain and refill capacity only. Does not include torque
    converter.

  1. - Mercon or Dexron-II fluid.

  2. - Mopar ATF Plus fluid only.

(6) - With trailer towing package (5000 lbs.), use 75W-140 synthetic
gear oil.

(7) - With trailer towing package use API GL-5 80W-140.

(8) - With modifier.

limited slip differential, add 2 ounces of friction

QUICK-SERVICE

SERVICE INTERVALS & SPECIFICATIONS

REPLACEMENT INTERVALS Component

Miles

Oil & Filter 7,500

Air Filter 30,000

Coolant 45,000

Fuel Filter 30,000

Oxygen Sensor 75,000

Spark Plugs 30,000

BELT ADJUSTMENT (Tension In Lbs. (kg) Using Belt Tension Gauge)

Application

Tension

Serpentine Belt (1)

New Belts 180-200 (81.72-90.8)

Used Belts 140-160 (63.56-72.64)

V-Belt

New Belts 120-160 (54.48-72.64)

Used Belts 90-115 (40.86-52.21)

(1) - Grand Cherokee is equipped with automatic belt adjustment.

MECHANICAL CHECKS

ENGINE COMPRESSION

Check engine compression with engine at normal operating temperature, all spark plugs removed and throttle wide open.

NOTE: Compression pressure and cylinder pressure variation for

2.5L and 4.0L engines are not available from manufacturer at time of publication.

COMPRESSION SPECIFICATIONS

Application Specification

2.5L

Cherokee 9.2:1

Wrangler 9.1:1

4.0L 8.8:1

5.2L 9.1:1

Normal Compression Pressure ... 120-150 psi (827-1034 kPa)

Minimum Compression Pressure 100 psi (689 kPa)

Maximum Variation Between Cylinders 5 psi (172 kPa)

VALVE CLEARANCE

NOTE: Vehicles are equipped with hydraulic lifters. No adjustments

are required.

IGNITION SYSTEM

IGNITION COIL

IGNITION COIL RESISTANCE - Ohms @ 68F (20C)

Application Primary Secondary

Diamond Coil 97-1.18 11,300-15,300

Toyodenso Coil 95-1.20 11,300-13,300

HIGH TENSION WIRE RESISTANCE

HIGH TENSION WIRE RESISTANCE

Application Ohms

All Wires 250-1000 per inch

SPARK PLUGS

SPARK PLUG TYPE

Application Specification

2 . 5L & 4 . 0L Champion RC-12 LYC

5. 2L Champion RC-12YC

SPARK PLUG SPECIFICATIONS

Application Gap: In. (mm) Torque: Ft. Lbs. (N.m)

2.5L, 4.0L & 5.2L .. .035 (.89) 27 (37)

FIRING ORDER & TIMING MARKS

FRONT OF VEHICLE


9087

Fig. 1: Firing Order & Timing Marks (2.5L)

Firing Order 1-5-3-6-2-4

Fig. 2: Firing Order & Timing Marks (4.0L)

95E35778

Fig. 3: Firing Order & Distributor Rotation (5.2L) Courtesy of Chrysler Corp.

IGNITION TIMING

Vehicles are equipped with Powertrain Control Module (PCM) computerized ignition. PCM controls ignition timing. No adjustment is possible.

DISTRIBUTOR SPECIFICATIONS

Vehicles are equipped with Powertrain Control Module

computerized ignition. Distributors only function is to distribute high voltage to appropriate spark plug. No adjustments are required.

FUEL SYSTEM

FUEL PUMP

NOTE: Fuel pump performance refers to fuel pressure and volume availability, not regulated fuel pressure.

FUEL PUMP PERFORMANCE

Application

2.5L, 4.0L & 5.2L

psi (kg/cm) . 39 (2.70)

Minimum Volume In 30 sec.
1 Pt. (.47L)

REGULATED FUEL PRESSURE

Application

With Vacuum Without Vacuum

psi (kg/cm) At Idle

31 (2.18) 39 (2.70)

INJECTOR RESISTANCE

INJECTOR RESISTANCE - Ohms @ 68F (20C)

Application Specification
2.5L, 4.0L & 5.2L 12.8-15.2

IDLE SPEED& MIXTURE

NOTE: Idle mixture is controlled by the Powertrain Control Module (PCM). Adjustment is not required or possible.

THROTTLE POSITION SENSOR (TPS)

2.5L, 4.0L & 5.2L

Output voltage (center terminal of TPS) should be .20 volts at closed throttle and less than 4.8 volts at WOT. TPS is not adjustable.