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 | Cold Crank Amps @ 0°F (-18°C) |
|---|
| Grand Cherokee | 34 | 600 |
| Application | (1) Quantity |
|---|
| Crankcase (2) | 6.0 Qts. (5.7L) |
| Cooling System | 12.0 Qts. (11.4L) |
| Automatic Transmission (3) |
| 42/44RE (4) | 8.5-11.0 Qts. (8.0-10.4L) |
| Axles (5) |
| Front (Model 181) | 2.5 Pts. (1.2L) |
| Rear (6) (7) |
| Model 194 | 3.5 Pts. (1.7L) |
| Model 216 | 4.8 Pts. (2.3L) |
| Transfer Case (Dexron-II Or ATF Plus) |
| 242 NVG | 3.0 Pts. (1.4L) |
| 249 NVG | 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 Type 7176 fluid only. (5) SAE 75W-90 API GL-5. (6) With trailer towing package, use Synthetic 75W-140 gear oil. (7) With limited slip differential, add 2-5 ounces of friction modifier. |
| (1) | Fluid capacities listed are approximate. Always fill to FULL mark. |
| (3) | Includes torque converter. |
| (4) | Mopar ATF Plus Type 7176 fluid only. |
| (6) | With trailer towing package, use Synthetic 75W-140 gear oil. |
| (7) | With limited slip differential, add 2-5 ounces of friction modifier. |
SERVICE INTERVALS & SPECIFICATIONS
| Component | Miles |
|---|
| Air Filter | 30,000 |
| Automatic Transmission | 30,000 |
| Coolant | (2) |
| Fuel Filter (3) | 60,000 |
| Manual Transmission | 37,500 |
| Oil & Filter | 7500 |
| Spark Plugs | 30,000 |
| Spark Plug Wires | 60,000 |
| Transfer Case | 30,000 |
| (1) Under normal operating conditions. (2) Replace coolant at 36 months, regardless of mileage, then replace every 24 months after that. (3) Required on California vehicles. |
| (1) | Under normal operating conditions. |
| (2) | Replace coolant at 36 months, regardless of mileage, then replace every 24 months after that. |
| (3) | Required on California vehicles. |
REPLACEMENT INTERVALS (1)
| Application | Tension Lbs. (Kg) |
|---|
| Serpentine Belt |
| New Belts (1) | 180-200 (81.7-90.8) |
| Used Belts | 140-160 (63.6-72.6) |
| (1) A belt is considered new if it has been used 15 minutes or less. |
| (1) | A belt is considered new if it has been used 15 minutes or less. |
ENGINE COMPRESSION
Check engine compression with engine at normal operating temperature, all spark plugs removed and throttle wide open.
| Application | Specification |
|---|
| Compression Ratio | 8.7:1 |
| Normal Compression Pressure | 120-150 psi (8.3-10.5 kg/cm 2 ) |
| Maximum Variation Between Cylinders | 30 psi (2.1 kg/cm 2 ) |
COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
Note. All models are equipped with hydraulic lifters. No adjustments are required.
IGNITION COIL
| Application | Primary | Secondary |
|---|
| Diamond Coil | .96-1.18 | 11,300-15,300 |
| Toyodenso Coil | .95-1.20 | 11,300-13,300 |
HIGH TENSION WIRE RESISTANCE
| Application | Ohms Per Inch |
|---|
| All Wires | 250-1000 |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | Specification |
|---|
| 4.0L | Champion RC-12LYC |
| Application | Gap: In. (mm) | Torque: Ft. Lbs. (N.m) |
|---|
| 4.0L | .035 (.89) | 30 (41) |
| (1) See underhood emissions sticker to verify gap. |
| (1) | See underhood emissions sticker to verify gap. |
SPARK PLUG SPECIFICATIONS (1)
Scheme 1
IGNITION TIMING
All models are equipped with Powertrain Control Module (PCM) computerized ignition. PCM controls ignition timing. DO NOT move distributor in an attempt to adjust timing, no timing adjustment is possible.
DISTRIBUTOR SPECIFICATIONS
All models are equipped with Powertrain Control Module comput-erized ignition. Distributor houses camshaft position sensor. Distributor also distributes high voltage to appropriate spark plug. No adjustments are required.
FUEL PUMP
Note. Fuel pump performance refers to regulated fuel pressure and volume availability. Mechanical fuel pressure regulator is part of fuel pump module and is not controlled by vacuum or PCM.
| Application | Psi (kg/cm 2 ) | Minimum Volume In 30 sec. |
|---|
| All Models | 44.2-54.2 (3.1-3.7) | .5 Pt. (.25L) |
| (1) DO NOT operate fuel pump longer than 7 seconds. |
| (1) | DO NOT operate fuel pump longer than 7 seconds. |
FUEL PUMP PERFORMANCE (1)
INJECTOR RESISTANCE
| Application | Specification |
|---|
| All Models | 10.8-13.2 |
IDLE SPEED & MIXTURE
Note. Idle speed and mixture are controlled by the Powertrain Control Module (PCM). Adjustment is not required or possible.
THROTTLE POSITION (TP) SENSOR
Output voltage (center terminal of TP sensor) should be more than .25 volt at closed throttle (idle) and less than 4.8 volts at WOT. Voltage should increase gradually and smoothly as throttle is slowly opened from idle to WOT. TP sensor is not adjustable.
