INTRODUCTION
Use this article to quickly find specifications related to servicing and on-vehicle adjustments. This is a quick-reference article to use when you are familiar with an adjustment procedure and only need a specification.
CAPACITIES
| Application & Group | CCA Rating |
|---|
| All Models (24/27) | 582/490, 622 |
| Application | Qts. (L) |
|---|
| Crankcase (Includes Filter) (1) | 5.7 (5.4) |
| Cooling System (Includes Heater) |
| A/T | 9.0 (8.5) |
| M/T | 9.3 (8.8) |
| Manual Transmission (2) | 3.1 (2.9) |
| Automatic Transmission (Dexron-II) Dry Refill | 9.1 (8.6) |
| Differential (3) |
| Front Axle | 1.5 (1.4) |
| Rear Axle | 1.9 (1.8) |
| Transfer Case (1) | 1.5 (1.45) |
| (1) Use SAE 10W-30 SF engine oil with ambient temperatures of -20°F (-29°C) to 100°F (38°C). (2) On standard differentials, use SAE 80W-90/API GL-5 gear oil. On limited slip differentials, use SAE 80W-90/API GL-5 gear oil rated for limited slip axles. (3) Rear use SAE 80W-90 GL-5 gear oil. Front use SAE 75W-90 gear oil with ambient temperatures -13°F (-25°C) to 86°F (30°C)., 80W-90 or 80W-140 gear oil with ambient temperatures 50°F (10°C) to 95°F (35°C). |
| (1) | Use SAE 10W-30 SF engine oil with ambient temperatures of -20°F (-29°C) to 100°F (38°C). |
| (2) | On standard differentials, use SAE 80W-90/API GL-5 gear oil. On limited slip differentials, use SAE 80W-90/API GL-5 gear oil rated for limited slip axles. |
| (3) | Rear use SAE 80W-90 GL-5 gear oil. Front use SAE 75W-90 gear oil with ambient temperatures -13°F (-25°C) to 86°F (30°C)., 80W-90 or 80W-140 gear oil with ambient temperatures 50°F (10°C) to 95°F (35°C). |
SERVICE INTERVALS & SPECIFICATIONS
| Component | Miles |
|---|
| Air Filter |
| Normal Service | 30,000 |
| Severe Service | (2) 15,000 |
| Coolant | 30,000 |
| Engine Oil & Filter (Normal Service) | 3000 |
| Fuel Filter | 30,000 |
| PCV Valve (4) | 100,000 |
| Spark Plugs |
| Normal Service | 60,000 |
| Severe Service | 60,000 |
| Spark Plug Wires |
| Normal Service | 60,000 |
| Severe Service | 60,000 |
| Automatic Transmission Fluid |
| Normal Service | (3) |
| Severe Service | 20,000 |
| Manual Transmission Fluid | (5) |
| Transfer Case Fluid (4WD) | (5) |
| Front Differential Fluid (4WD) | (5) |
| Rear Differential Fluid | (5) |
| Repack FT Wheel Bearings (2WD) Normal Service | 15,000 |
| Replace Timing Belt (6) | 60,000 |
| Replace Brake Fluid | 45,000 |
| Replace Power Steering Fluid | 30,000 |
| Rotate Tires & Check Brakes | 6000 |
| (1) Different interval is required for normal and severe service. Severe service is described as trailer towing, off-highway operation, snow removal operation, or operating in dusty or excessively hot conditions. (2) Inspect air filter every 15,000 miles and replace as necessary. Replace at 30,000 miles unless previously replaced during inspection. (3) There is no need to change fluid unless used under severe conditions. (4) Inspect at scheduled interval and replace as necessary. (5) Replace fluid at 15,000 miles. After first fluid change, replace fluid every 30,000 miles thereafter. (6) Inspect water pump (where applicable). |
| (1) | Different interval is required for normal and severe service. Severe service is described as trailer towing, off-highway operation, snow removal operation, or operating in dusty or excessively hot conditions. |
| (2) | Inspect air filter every 15,000 miles and replace as necessary. Replace at 30,000 miles unless previously replaced during inspection. |
| (3) | There is no need to change fluid unless used under severe conditions. |
| (4) | Inspect at scheduled interval and replace as necessary. |
| (5) | Replace fluid at 15,000 miles. After first fluid change, replace fluid every 30,000 miles thereafter. |
| (6) | Inspect water pump (where applicable). |
REPLACEMENT INTERVALS (1)
| Application | Miles |
|---|
| All Models | (1) |
| (1) Hydraulic lash adjusters are used. No adjustment is required. |
| (1) | Hydraulic lash adjusters are used. No adjustment is required. |
VALVE CLEARANCE ADJUSTMENT INTERVALS
| Application | (2) Belt Deflection |
|---|
| A/C Belt | .315" (8 mm) |
| Generator & Power Steering Belt | N/A |
| (1) Some models are checked by belt deflection; other models are checked using belt tension gauge. (2) Deflection is checked with 22 lbs. (10 kg) pressure applied midway on longest belt run. |
| (1) | Some models are checked by belt deflection; other models are checked using belt tension gauge. |
| (2) | Deflection is checked with 22 lbs. (10 kg) pressure applied midway on longest belt run. |
BELT ADJUSTMENT (DEFLECTION) (1)
| Application | (2) Belt Tension |
|---|
| A/C Belt | 100-140 lbs. (45-64 kg) |
| Alternator & Fan Belt | 100-120 lbs. (45-54 kg) |
| P/S Belt | 70-110 lbs. (32-50 kg) |
| (1) Some models are checked by belt deflection; other models are checked using belt tension gauge. (2) Belt tension checked with belt tension gauge. |
| (1) | Some models are checked by belt deflection; other models are checked using belt tension gauge. |
| (2) | Belt tension checked with belt tension gauge. |
BELT ADJUSTMENT (TENSION) (1)
ENGINE COMPRESSION
| Application | Specification |
|---|
| Compression Ratio | 9.0:1 |
| Compression Pressure (1) | 171 psi (12.0 kg/cm 2 ) |
| (1) Minimum pressure is 128 psi (9.0 kg/cm 2 ). |
| (1) | Minimum pressure is 128 psi (9.0 kg/cm 2 ). |
COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
Note. Trooper/SLX is equipped with hydraulic lash adjusters. No adjustment is required.
VALVE ARRANGEMENT
Intake valves are on side of head closest to intake manifold. Exhaust valves are on side of head closest to exhaust manifold.
IGNITION COIL
| Application (1) | Primary | Secondary |
|---|
| All Models | N/A | N/A |
| (1) Insulation resistance should not be more than 10 megohms. |
| (1) | Insulation resistance should not be more than 10 megohms. |
IGNITION COIL RESISTANCE - Ohms @ 68°F (20°C)
HIGH TENSION WIRE RESISTANCE
| Application (1) | Resistance |
|---|
| 0-15" wire | 3000-10,000 |
| 15-25" wire | 4000-15,000 |
| 25-35" wire | 6000-20,000 |
| (1) Wire longer then 35" should measure about 5000-10,000 ohms/foot. |
| (1) | Wire longer then 35" should measure about 5000-10,000 ohms/foot. |
HIGH TENSION WIRE RESISTANCE - Ohms @ 68°F (20°C)
SPARK PLUGS
| Application | No. |
|---|
| NGK | PK16PR11 |
| Champion | RC10PYP4 |
| Application | Gap: In. (mm) | Torque: Ft. Lbs. (N.m) |
|---|
| All Models | .041 (1.05) | 14 (19) |
SPARK PLUG SPECIFICATIONS
Firing Order. Scheme 1
| Application | Base Timing |
|---|
| All Models | 16 @ 750 |
IGNITION TIMING (Degrees BTDC @ RPM)
FUEL PUMP
| Application | Pressure psi (kg/cm 2 ) |
|---|
| All Models | 42-55 (2.9-3.9) |
INJECTOR RESISTANCE
| Application | Ohms |
|---|
| All Models | 11.8-12.6 |
IDLE SPEED
| Application | RPM |
|---|
| All Models (1) | 750 |
| (1) Idle speed is controlled by PCM and is not adjustable. |
| (1) | Idle speed is controlled by PCM and is not adjustable. |
IDLE SPEED SPECIFICATIONS
THROTTLE POSITION (TP) SENSOR
Note. Refer to ADJUSTMENTS article for throttle position sensor/switch adjustment procedures.
