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.
BATTERY SPECIFICATIONS
| Application | Group | Cold Crank Amps @ 0°F (-18°C) |
|---|
| Grand Cherokee | 34 | 600 |
FLUID CAPACITIES
| Application | (1) Quantity |
|---|
| Crankcase (2) |
| 4.0L | 6.0 Qts. (5.7L) |
| 5.2L | 5.0 Qts. (4.7L) |
| Cooling System (Includes Heater) |
| 4.0L |
| Standard Cooling System | 9.0 Qts. (8.5L) |
| Heavy-Duty Cooling System | 10.0 Qts. (9.5L) |
| 5.2L | 14.9 Qts. (14.1L) |
| Automatic Transmission (3) |
| 42RE (4) | 10.1 Qts. (9.6L) |
| 46RH (4) | 10.9 Qts. (10.3L) |
| Manual Transmission (API GL-5 75W-90) | 6.6 Pts. (3.1L) |
| Front/Rear Axles (API GL-5 75W-90) (5) (6) | 3.5 Pts. (1.6L) |
| Transfer Case (Mercon or Dexron-II) |
| Command-Trac (NP 231) | 2.5 Pts. (1.2L) |
| Select-Trac (NP 242) | 2.75 Pts. (1.4L) |
| Quadra-Trac AWD (NP 249) | 2.5 Pts. (1.2L) |
| (1) Fluid capacities listed are approximate. Always fill to FULL mark. (2) Includes oil filter. (3) Includes torque converter. (4) Mopar ATF Plus fluid only. (5) With trailer towing package use API GL-5 80W-140. (6) With limited slip differential, add 2 ounces of friction modifier. |
| (1) | Fluid capacities listed are approximate. Always fill to FULL mark. |
| (3) | Includes torque converter. |
| (4) | Mopar ATF Plus fluid only. |
| (5) | With trailer towing package use API GL-5 80W-140. |
| (6) | With limited slip differential, add 2 ounces of friction modifier. |
Replacement Intervals
| Component | Miles |
|---|
| Air Filter | 30,000 |
| Coolant | 52,500 |
| Fuel Filter (1) | 60,000 |
| Oil & Filter | 7,500 |
| Spark Plugs | 30,000 |
| (1) Not required on California vehicles. |
| (1) | Not required on California vehicles. |
Drive Belt Adjustment (Tension In Lbs. (kg) Using Belt Tension Gauge)
| Application | Tension |
|---|
| Serpentine Belt (1) |
| New Belts | 180-200 (81.72-90.80) |
| Used Belts | 140-160 (63.56-72.64) |
| (1) Vehicles are equipped with automatic belt adjuster. |
| (1) | Vehicles are equipped with automatic belt adjuster. |
BELT ADJUSTMENT (Tension In Lbs. (kg) Using Belt Tension Gauge)
ENGINE COMPRESSION
Check engine compression with engine at normal operating temperature, all spark plugs removed and throttle wide open.
| Application | Specification |
|---|
| 4.0L | 8.7:1 |
| 5.2L | 9.1:1 |
| Compression Pressure |
| Normal | 120-150 psi (827-1034 kPa) |
| Minimum | 100 psi (689 kPa) |
| Maximum Variation Between Cylinders | 30 psi (207 kPa) |
COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
Note. Vehicles are equipped with hydraulic lifters. No adjustments are required.
IGNITION COIL
| Application | Primary | Secondary |
|---|
| Diamond Coil | .97-1.18 | 11,300-15,300 |
| Toyodenso Coil | .95-1.20 | 11,300-13,300 |
IGNITION COIL RESISTANCE - Ohms @ 75°F (24°C)
HIGH TENSION WIRE RESISTANCE
| Application | Ohms |
|---|
| All Wires | 250-1000 per inch |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | Specification |
|---|
| 4.0L | Champion RC-12 LYC |
| 5.2L | Champion RC-12YC |
| Application | Gap: In. (mm) | Torque: Ft. Lbs. (N.m) |
|---|
| 4.0L & 5.2L | .035 (.89) (1) | 26-30 (35-41) |
| (1) See underhood emissions sticker to verify gap. |
| (1) | See underhood emissions sticker to verify gap. |
SPARK PLUG SPECIFICATIONS
Firing Order & Timing Marks (4.0L). Scheme 1
Scheme 1: Firing Order & Timing Marks (4.0L)
Scheme 2
Scheme 2: Firing Order & Distributor Rotation (5.2L)
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. Distributor's only function is to distribute high voltage to appropriate spark plug. No adjustments are required.
FUEL PUMP
Note. Fuel pump performance refers to fuel pressure and volume availability, not regulated fuel pressure.
| Application | Psi (kg/cm 2 ) | Minimum Volume In 30 sec. |
|---|
| 4.0L & 5.2L | 39-41 (2.70-2.88) | 1 Pt. (.47L) |
| Application | Psi (kg/cm 2 ) |
|---|
| Vacuum Line Disconnected | 39-41 (2.70-2.88) |
| Vacuum Line Connected | 31 (2.18) |
FUEL SYSTEM PRESSURE SPECIFICATIONS
INJECTOR RESISTANCE
| Application | Specification |
|---|
| 4.0L & 5.2L | 13.3-15.7 |
INJECTOR RESISTANCE - Ohms @ 68°F (20°C)
IDLE SPEED & MIXTURE
Note. Idle mixture is controlled by the Powertrain Control Module (PCM). Adjustment is not required or possible.
THROTTLE POSITION SENSOR (TPS)
Output voltage (center terminal of TPS) should be .20 volt at closed throttle and less than 4.8 volts at WOT. TPS is not adjustable.
