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.
FLUID CAPACITIES (CHEROKEE)
| Application | (1) Quantity |
|---|
| Crankcase (2) | 6.0 Qts. (5.7L) |
| Cooling System | (3) 12.0 Qts. (11.4L) |
| Automatic Transmission |
| AW4 (4) |
| Drain & Fill | 3.5 Qts. (3.3L) |
| Dry Fill | 8.9 Qts. (8.4L) |
| Manual Transmission |
| NV3550 (5) | 3.3 Qts. (3.2L) |
| Axles |
| Front |
| Model 181 FBI (6) | 3.1 Pts. (1.5L) |
| Model 186 FBI (6) | 2.5 Pts. (1.2L) |
| Rear |
| Model 8 1/4 (7) | 4.4 Pts. (2.1L) |
| Model 194 (8) | 3.5 Pts. (1.7L) |
| Power Steering | (9) |
| Transfer Case |
| NV231 (10) | 2.5 Pts. (1.2L) |
| NV242 (10) | 2.9 Pts. (1.3L) |
| (1) Fluid capacities listed are approximate. (2) Includes oil filter. Use 10W-30 (preferred) or 5W-30. (3) Includes 1.0 qt. (0.9L) for coolant recovery tank. (4) Use Mopar® Dexron III/Mercon fluid. (5) Use Mopar® Manual Transmission Lubricant (4874464). (6) Use SAE 80W-90 API GL-5. For heavy-duty or trailer tow, use SAE 75W-140 synthetic gear lubricant. (7) Use SAE 80W-90 API GL-5. For heavy-duty or trailer tow, use SAE 75W-90 synthetic gear lubricant. With Trac-Lok, add 4.0 ounces of friction modifier. (8) Use SAE 80W-90 API GL-5. For heavy-duty or trailer tow, use SAE 75W-90 synthetic gear lubricant. With Trac-Lok, add 3.5 ounces of friction modifier. (9) Use only Mopar® power steering fluid. DO NOT use automatic transmission fluid. (10) Use Mopar® ATF +4, Type 9602 fluid only. |
| (1) | Fluid capacities listed are approximate. |
| (2) | Includes oil filter. Use 10W-30 (preferred) or 5W-30. |
| (3) | Includes 1.0 qt. (0.9L) for coolant recovery tank. |
| (4) | Use Mopar® Dexron III/Mercon fluid. |
| (5) | Use Mopar® Manual Transmission Lubricant (4874464). |
| (6) | Use SAE 80W-90 API GL-5. For heavy-duty or trailer tow, use SAE 75W-140 synthetic gear lubricant. |
| (7) | Use SAE 80W-90 API GL-5. For heavy-duty or trailer tow, use SAE 75W-90 synthetic gear lubricant. With Trac-Lok, add 4.0 ounces of friction modifier. |
| (8) | Use SAE 80W-90 API GL-5. For heavy-duty or trailer tow, use SAE 75W-90 synthetic gear lubricant. With Trac-Lok, add 3.5 ounces of friction modifier. |
| (9) | Use only Mopar® power steering fluid. DO NOT use automatic transmission fluid. |
| (10) | Use Mopar® ATF +4, Type 9602 fluid only. |
FLUID CAPACITIES (CHEROKEE)
FLUID CAPACITIES (GRAND CHEROKEE)
| Application | (1) Quantity |
|---|
| Crankcase (2) |
| 4.0L & 4.7L | 6.0 Qts. (5.7L) |
| Cooling System |
| 4.0L | (3) 15.0 Qts. (14.1L) |
| 4.7L | (3) 14.5 Qts. (13.7L) |
| Automatic Transmission |
| 42RE (4) |
| Drain & Refill | 4.0 Qts. (3.8L) |
| Dry Fill | 9.6-10.0 Qts. (9.1-9.5L) |
| 45RFE (4) |
| Drain & Refill | 5.0 Qts. (4.7L) |
| Dry Fill | 14 Qts. (13.3L) |
| Axles |
| Front |
| Model 186 FBI (5) | 2.5 Pts. (1.2L) |
| Rear |
| Model 194 RBI (6) | 3.5 Pts. (1.7L) |
| Model 226 RBI (6) | 4.8 Pts. (2.3L) |
| Power Steering | (7) |
| Transfer Case |
| NV 242 (4) | 3.0 Pts. (1.4L) |
| NV 247 (8) | 3.4 Pts. (1.6L) |
| (1) Fluid capacities listed are approximate. (2) Includes oil filter. Use 10W-30 (preferred) or 5W-30. (3) Includes 1.0 qt. (0.9L) for coolant recovery tank. (4) Use Mopar® ATF +4, Type 9602 fluid only. (5) Use SAE 80W-90 API GL-5. For heavy-duty or trailer tow, use SAE 75W-140 synthetic gear lubricant. (6) Use SAE 80W-90 API GL-5. For heavy-duty or trailer tow, use SAE 75W-140 synthetic gear lubricant. With Trac-Lok, add 4 ounces of friction modifier. (7) Use only Mopar® power steering fluid. DO NOT use automatic transmission fluid. (8) Use Mopar® Transmission Lubricant (05016796). |
| (1) | Fluid capacities listed are approximate. |
| (2) | Includes oil filter. Use 10W-30 (preferred) or 5W-30. |
| (3) | Includes 1.0 qt. (0.9L) for coolant recovery tank. |
| (4) | Use Mopar® ATF +4, Type 9602 fluid only. |
| (5) | Use SAE 80W-90 API GL-5. For heavy-duty or trailer tow, use SAE 75W-140 synthetic gear lubricant. |
| (6) | Use SAE 80W-90 API GL-5. For heavy-duty or trailer tow, use SAE 75W-140 synthetic gear lubricant. With Trac-Lok, add 4 ounces of friction modifier. |
| (7) | Use only Mopar® power steering fluid. DO NOT use automatic transmission fluid. |
| (8) | Use Mopar® Transmission Lubricant (05016796). |
FLUID CAPACITIES (GRAND CHEROKEE)
FLUID CAPACITIES (WRANGLER)
| Application | (1) Quantity |
|---|
| Crankcase (2) |
| 2.5L | 4.0 Qts. (3.8L) |
| 4.0L | 6.0 Qts. (5.7L) |
| Cooling System |
| 2.5L | 9.0 Qts. (8.5L) |
| 4.0L | 10.5 Qts. (9.9L) |
| Automatic Transmission |
| 30RH (3) |
| Drain & Fill | 4.0 Qts. (3.8L) |
| Dry Fill | 5.0 Qts. (4.7L) |
| 32RH (3) |
| Drain & Fill | 4.0 Qts. (3.8L) |
| Dry Fill | 6.7 Qts. (6.3L) |
| Manual Transmission |
| AX-5 (4) | 3.3 Qts. (3.1L) |
| NV3550 (5) | 2.4 Qts. (2.3L) |
| Axles |
| Front |
| Model 181 FBI (6) | 2.5 Pts. (1.2L) |
| Rear |
| Model 194 RBI (7) | 3.5 Pts. (1.7L) |
| Model 216 RBI (7) | 4.0 Pts. (1.9L) |
| Power Steering | (8) |
| Transfer Case |
| NV231 (3) | 2.2 Pts. (1.0L) |
| (1) Fluid capacities listed are approximate. (2) Includes oil filter. Use 10W-30 (preferred) or 5W-30. (3) Mopar® ATF +4, Type 9602 fluid only. (4) Use SAE 75W-90 API GL-3. (5) Mopar® Manual Transmission Lubricant (4874464). (6) Use SAE 80W-90 API GL-5. For heavy-duty or trailer tow, use SAE 75W-140 synthetic gear lubricant. (7) Use SAE 80W-90 API GL-5. For heavy-duty or trailer tow, use SAE 75W-140 synthetic gear lubricant. With Trac-Lok, add 4 ounces of friction modifier. (8) Use only Mopar® power steering fluid. DO NOT use automatic transmission fluid. |
| (1) | Fluid capacities listed are approximate. |
| (2) | Includes oil filter. Use 10W-30 (preferred) or 5W-30. |
| (3) | Mopar® ATF +4, Type 9602 fluid only. |
| (4) | Use SAE 75W-90 API GL-3. |
| (5) | Mopar® Manual Transmission Lubricant (4874464). |
| (6) | Use SAE 80W-90 API GL-5. For heavy-duty or trailer tow, use SAE 75W-140 synthetic gear lubricant. |
| (7) | Use SAE 80W-90 API GL-5. For heavy-duty or trailer tow, use SAE 75W-140 synthetic gear lubricant. With Trac-Lok, add 4 ounces of friction modifier. |
| (8) | Use only Mopar® power steering fluid. DO NOT use automatic transmission fluid. |
FLUID CAPACITIES (WRANGLER)
REPLACEMENT INTERVALS (CHEROKEE)
| Component | Months | Miles |
|---|
| Air Filter |
| Normal Service | 24 | 30,000 |
| Severe Service | (2) | 15,000 |
| Automatic Transmission |
| Normal Service | 24 | 30,000 |
| Severe Service | (2) | 12,000 |
| Coolant | (3) | (3) |
| Drive Belt (4) |
| Normal Service | 48 | (5) 60,000 |
| Severe Service | (2) | 30,000 |
| Manual Transmission (6) |
| Oil & Filter |
| Normal Service | 6 | 7500 |
| Severe Service | (2) | 3000 |
| Spark Plugs | 24 | 30,000 |
| Transfer Case | 24 | 30,000 |
| (1) Different interval may be required for normal and severe service. Severe service is described as frequent short trip driving (less than 5 miles), frequent driving in dusty conditions, extensive idling, trailer towing, sustained high speed operation, off road driving, desert operation, cold climate operation and commercial service. (2) Monthly service interval does not apply. (3) Replace coolant at 52,500 miles or 42 months. Then replace coolant every 30,000 miles or 24 months afterward. (4) Inspect and/or replace belt as necessary. Adjust tension if necessary. (5) After intial inspection, check every 30,000 miles or 24 months afterward. (6) Service intervals are not available from manufacturer. Check fluid level at every engine oil change. |
| (1) | Different interval may be required for normal and severe service. Severe service is described as frequent short trip driving (less than 5 miles), frequent driving in dusty conditions, extensive idling, trailer towing, sustained high speed operation, off road driving, desert operation, cold climate operation and commercial service. |
| (2) | Monthly service interval does not apply. |
| (3) | Replace coolant at 52,500 miles or 42 months. Then replace coolant every 30,000 miles or 24 months afterward. |
| (4) | Inspect and/or replace belt as necessary. Adjust tension if necessary. |
| (5) | After intial inspection, check every 30,000 miles or 24 months afterward. |
| (6) | Service intervals are not available from manufacturer. Check fluid level at every engine oil change. |
REPLACEMENT INTERVALS (CHEROKEE) (1)
REPLACEMENT INTERVALS (GRAND CHEROKEE)
| Component | Months | Miles |
|---|
| Air Filter |
| Normal Service | 24 | 30,000 |
| Severe Service | (2) | 15,000 |
| Automatic Transmission |
| Normal Service |
| 4.0L | (2) | (3) 100,000 |
| 4.7L | (2) | (4) 100,000 |
| Severe Service |
| 4.0L | (2) | (3) 30,000 |
| 4.7L | (2) | (4) 30,000 |
| Coolant | (5) | (5) |
| Drive Belt |
| Normal Service |
| 4.0L | 48 | (6) 60,000 |
| 4.7L | 72 | (6) 90,000 |
| Severe Service |
| 4.0L | (2) | (6) 45,000 |
| 4.7L | (2) | (6) 75,000 |
| Front & Rear Axles |
| Normal Service | (7) | (7) |
| Severe Service | (2) | 12,000 |
| Oil & Filter |
| Normal Service | 6 | 7500 |
| Severe Service | (2) | 3000 |
| PCV Valve |
| 4.7L |
| Normal Service | 48 | (8) 60,000 |
| Severe Service | (2) | (8) 30,000 |
| Spark Plugs | 24 | 30,000 |
| Transfer Case | 24 | 30,000 |
| (1) Different interval may be required for normal and severe service. Severe service is described as frequent short trip driving (less than 5 miles), frequent driving in dusty conditions, extensive idling, trailer towing, sustained high speed operation, off road driving, desert operation, cold climate operation and commercial service. (2) Monthly service interval does not apply. (3) Change fluid, filter and adjust bands. (4) Change fluid, main sump filter and spin-on cooler return filter. (5) Replace coolant at 52,500 or 36 months. Then replace coolant every 24 months afterward. (6) Inspect and/or replace as necessary. Check every 15,000 miles afterward. (7) Service intervals are not available from manufacturer. Check fluid level at every engine oil change. (8) Inspect and replace if necessary. |
| (1) | Different interval may be required for normal and severe service. Severe service is described as frequent short trip driving (less than 5 miles), frequent driving in dusty conditions, extensive idling, trailer towing, sustained high speed operation, off road driving, desert operation, cold climate operation and commercial service. |
| (2) | Monthly service interval does not apply. |
| (3) | Change fluid, filter and adjust bands. |
| (4) | Change fluid, main sump filter and spin-on cooler return filter. |
| (5) | Replace coolant at 52,500 or 36 months. Then replace coolant every 24 months afterward. |
| (6) | Inspect and/or replace as necessary. Check every 15,000 miles afterward. |
| (7) | Service intervals are not available from manufacturer. Check fluid level at every engine oil change. |
| (8) | Inspect and replace if necessary. |
REPLACEMENT INTERVALS (GRAND CHEROKEE) (1)
REPLACEMENT INTERVALS (WRANGLER)
| Component | Months | Miles |
|---|
| Air Filter |
| Normal Service | 24 | 30,000 |
| Severe Service | (2) | 15,000 |
| Automatic Transmission |
| Normal Service | (2) | (3) 100,000 |
| Severe Service | (2) | (3) 60,000 |
| Coolant | (4) | (4) |
| Drive Belt (5) |
| Normal Service |
| 2.5L | 24 | 30,000 |
| 4.0L | 48 | (6) 60,000 |
| Severe Service |
| 2.5L | (2) | 30,000 |
| 4.0L & 4.7L | (2) | (6) 45,000 |
| Front & Rear Axles |
| Normal Service | (7) | (7) |
| Severe Service | (2) | 12,000 |
| Manual Transmission (7) |
| Oil & Filter |
| Normal Service | 6 | 7500 |
| Severe Service | (2) | 3000 |
| Spark Plugs | 24 | 30,000 |
| Spark Plug Wires |
| 2.5L | 48 | 60,000 |
| Transfer Case | 24 | 30,000 |
| (1) Different interval may be required for normal and severe service. Severe service is described as frequent short trip driving (less than 5 miles), frequent driving in dusty conditions, extensive idling, trailer towing, sustained high speed operation, off road driving, desert operation, cold climate operation and commercial service. (2) Monthly service interval does not apply. (3) Change fluid, filter and adjust bands. (4) Replace coolant at 60 months, regardless of mileage, then replace every 24 months afterward. (5) Inspect and/or replace as necessary. On 2.5L, adjust tension if necessary. (6) After 45,000 or 60,000 inspection, check every 15,000 miles afterward. (7) Service intervals are not available from manufacturer. Check fluid level at every engine oil change. |
| (1) | Different interval may be required for normal and severe service. Severe service is described as frequent short trip driving (less than 5 miles), frequent driving in dusty conditions, extensive idling, trailer towing, sustained high speed operation, off road driving, desert operation, cold climate operation and commercial service. |
| (2) | Monthly service interval does not apply. |
| (3) | Change fluid, filter and adjust bands. |
| (4) | Replace coolant at 60 months, regardless of mileage, then replace every 24 months afterward. |
| (5) | Inspect and/or replace as necessary. On 2.5L, adjust tension if necessary. |
| (6) | After 45,000 or 60,000 inspection, check every 15,000 miles afterward. |
| (7) | Service intervals are not available from manufacturer. Check fluid level at every engine oil change. |
REPLACEMENT INTERVALS (WRANGLER) (1)
DRIVE BELT ADJUSTMENT
| Application | Tension Lbs. (Kg) |
|---|
| Serpentine Belt (1) |
| New Belts (2) | 180-200 (81.7-90.8) |
| Used Belts | 140-160 (63.6-72.6) |
| (1) Cherokee and Grand Cherokee models with 4.0L and 4.7L engines are equipped with an automatic belt tensioner. DO NOT attempt to adjust belt tension. (2) A belt is considered new if it has been used 15 minutes or less. |
| (1) | Cherokee and Grand Cherokee models with 4.0L and 4.7L engines are equipped with an automatic belt tensioner. DO NOT attempt to adjust belt tension. |
| (2) | 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 | Psi (kg/cm 2 ) |
|---|
| Normal Compression Pressure |
| 2.5L & 4.0L | 120-150 (8.3-10.5) |
| 4.7L | 140-180 (9.8-12.7) |
| Maximum Variation Between Cylinders |
| 2.5L & 4.0L | 30 (2.1) |
| 4.7L | (1) |
| (1) Information is not available from manufacturer. |
| (1) | Information is not available from manufacturer. |
COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
Note. All models are equipped with hydraulic lifters. No adjustments are required.
IGNITION COIL
| Application | Primary | Secondary |
|---|
| 2.5L |
| Diamond Coil | .97-1.18 | 11,300-15,300 |
| Toyodenso Coil | .95-1.20 | 11,300-13,300 |
| 4.0L | .71-.88 | (1) |
| 4.7L | .6-.9 | 6000-9000 |
| (1) Secondary resistance cannot be checked using an ohmmeter. |
| (1) | Secondary resistance cannot be checked using an ohmmeter. |
IGNITION COIL RESISTANCE - Ohms @ 70-80°F (21-27°C)
HIGH TENSION WIRE RESISTANCE
| Application | Ohms Per Inch |
|---|
| All Wires | 250-1000 |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | Specification |
|---|
| 2.5L & 4.0L | Champion RC12ECC |
| 4.7L | Champion RC12MCC4 |
| Application | Gap - In. (mm) | Torque - Ft. Lbs. (N.m) |
|---|
| 2.5L & 4.0L | .035 (.89) | 30 (41) |
| 4.7L | .040 (1.01) | 30 (41) |
SPARK PLUG SPECIFICATIONS
FIRING ORDER
Scheme 1
Scheme 1: Firing Order (2.5L)
Scheme 2
Scheme 2: Firing Order (4.0L)
Scheme 3
Scheme 3: Firing Order (4.7L)
IGNITION TIMING
All models are equipped with Powertrain Control Module (PCM) computerized ignition. PCM controls ignition timing. DO NOT attempt to adjust ignition timing by rotating distributor (2.5L) or oil pump drive shaft assembly (4.0L). If distributor or oil pump drive is rotated or replaced, fuel system synchronization will be changed. To synchronize fuel system, see FUEL SYSTEM SYNCHRONIZATION under FUEL SYSTEMS in ON-VEHICLE ADJUSTMENTS article.
FUEL PUMP
Note. Fuel pump performance refers to regulated fuel pressure and volume availability. Mechanical fuel filter/pressure regulator is not controlled by vacuum or Powertrain Control Module (PCM). On Cherokee and Wrangler, fuel filter/pressure regulator is part of fuel pump module mounted in top of fuel tank. On Grand Cherokee, fuel filter/pressure regulator is located in front of fuel tank, above rear axle.
| Application | Pressure - psi (kg/cm 2 ) | (2) Min. Vol. In 7 Sec. |
|---|
| All Models | 44.2-54.2 (3.1-3.7) | .5 Pt. (.25L) |
| (1) Fuel pressure is measured with engine idling. (2) DO NOT operate fuel pump longer than 7 seconds when checking pump volume. Fuel pump module reservoir may run empty. |
| (1) | Fuel pressure is measured with engine idling. |
| (2) | DO NOT operate fuel pump longer than 7 seconds when checking pump volume. Fuel pump module reservoir may run empty. |
FUEL PUMP PERFORMANCE (1)
INJECTOR RESISTANCE
| Application | Specification |
|---|
| All Models | 10.8-13.2 |
INJECTOR RESISTANCE - Ohms @ 68°F (20°C)
IDLE SPEED & MIXTURE
Note. Idle speed and mixture are controlled by the Powertrain Control Module (PCM). Adjustment is not required or possible.
THROTTLE BODY MINIMUM AIRFLOW IDLE SPEED
| Application | RPM |
|---|
| All Models | 500-900 |
| (1) See CHECKING MINIMUM AIRFLOW under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING article for test procedure. |
| (1) | See CHECKING MINIMUM AIRFLOW under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING article for test procedure. |
THROTTLE POSITION (TP) SENSOR
Output voltage (center terminal of TP sensor) should be approximately .96 volt at closed throttle (idle) and approximately 4.49 volts at Wide Open Throttle (WOT). Voltage should increase gradually and smoothly as throttle is slowly opened from idle to WOT. TP sensor is not adjustable. Closed throttle (idle) TP sensor voltage is a "learned" Powertrain Control Module (PCM) function.
