Jeep Grand Cherokee WK. Manual — part 1174
STANDARD PROCEDURE - CYLINDER BORE
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1365
. . . . . . . . . . . . . . . . . . . . . . . . . . 1365
. . . . . . . . . . . . . . . . . . . . . . . . . 1366
BEARINGS-CONNECTING ROD
STANDARD PROCEDURE - CONNECTING
. . . . . . . . . . . . . . 1366
CRANKSHAFT
. . . . . . . . . . . . . . . . . . . . . . . 1369
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1370
. . . . . . . . . . . . . . . . . . . . . . . . . 1370
. . . . . . . . . . . . . . . . . . . . . . . 1371
BEARINGS - CRANKSHAFT MAIN
STANDARD PROCEDURE - CRANKSHAFT
. . . . . . . . . . . . . 1373
. . . . . . . . . . . . . . . . . . . . . . . . . 1374
SEAL - CRANKSHAFT OIL - FRONT
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1375
. . . . . . . . . . . . . . . . . . . . . . . 1376
CRANKSHAFT OIL SEAL - REAR
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1376
. . . . . . . . . . . . . . . . . . . . . . . 1377
FLEX PLATE
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1378
. . . . . . . . . . . . . . . . . . . . . . . 1378
ROD - PISTON & CONNECTING
. . . . . . . . . . . . . . . . . . . . . . . 1379
. . . . . . . . . . . . . . . . . . . . 1379
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1380
. . . . . . . . . . . . . . . . . . . . . . . . . . 1381
. . . . . . . . . . . . . . . . . . . . . . . . . 1381
. . . . . . . . . . . . . . . . . . . . . . . 1381
RINGS - PISTON
STANDARD PROCEDURE - PISTON RING
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1383
DAMPER - CRANKSHAFT
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1385
. . . . . . . . . . . . . . . . . . . . . . . 1386
STRUCTURAL COVER
. . . . . . . . . . . . . . . . . . . . . . . 1387
. . . . . . . . . . . . . . . . . . . . . . . . . 1387
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1387
. . . . . . . . . . . . . . . . . . . . . . . 1388
MOUNT-ENGINE FRONT
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1388
. . . . . . . . . . . . . . . . . . . . . . . 1389
MOUNT-ENGINE REAR
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1389
. . . . . . . . . . . . . . . . . . . . . . . 1390
LUBRICATION
. . . . . . . . . . . . . . . . . . . . . . . 1391
. . . . . . . . . . . . . . . . . . . . . . . . . 1392
DIAGNOSIS AND TESTING - ENGINE OIL
PRESSURE . . . . . . . . . . . . . . . . . . . . . . . . 1394
DIAGNOSIS AND TESTING - REAR SEAL
AREA LEAKS . . . . . . . . . . . . . . . . . . . . . . . 1394
DIAGNOSIS AND TESTING - ENGINE OIL
LEAK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1395
OIL
STANDARD PROCEDURE - ENGINE OIL
. . . . . . . . . . . . . . . . . . . . . . . . . . 1396
FILTER - ENGINE OIL
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1397
. . . . . . . . . . . . . . . . . . . . . . . 1397
PAN - ENGINE OIL
. . . . . . . . . . . . . . . . . . . . . . . 1398
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1398
. . . . . . . . . . . . . . . . . . . . . . . . . . 1399
. . . . . . . . . . . . . . . . . . . . . . . . . 1400
. . . . . . . . . . . . . . . . . . . . . . . 1400
SWITCH - OIL PRESSURE
. . . . . . . . . . . . . . . . . . . . . . . 1401
. . . . . . . . . . . . . . . . . . . . . . . . . 1401
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1402
. . . . . . . . . . . . . . . . . . . . . . . 1402
PUMP - ENGINE OIL
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1402
. . . . . . . . . . . . . . . . . . . . . . . 1402
. . . . . . . . . . . . . . . . . . . . . . . . . . 1402
. . . . . . . . . . . . . . . . . . . . . . . . . 1403
. . . . . . . . . . . . . . . . . . . . . . . . . . 1405
. . . . . . . . . . . . . . . . . . . . . . . 1405
MANIFOLD - INTAKE
. . . . . . . . . . . . . . . . . . . . . . . 1405
DIAGNOSIS AND TESTING - INTAKE
. . . . . . . . . . . . . . . . 1405
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1406
. . . . . . . . . . . . . . . . . . . . . . . . . . 1407
. . . . . . . . . . . . . . . . . . . . . . . . . 1407
. . . . . . . . . . . . . . . . . . . . . . . 1407
MANIFOLD - EXHAUST LEFT
. . . . . . . . . . . . . . . . . . . . . . . 1408
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1408
. . . . . . . . . . . . . . . . . . . . . . . . . . 1409
. . . . . . . . . . . . . . . . . . . . . . . . . 1409
. . . . . . . . . . . . . . . . . . . . . . . 1409
MANIFOLD - EXHAUST RIGHT
. . . . . . . . . . . . . . . . . . . . . . . 1410
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1410
. . . . . . . . . . . . . . . . . . . . . . . . . . 1411
. . . . . . . . . . . . . . . . . . . . . . . . . 1411
. . . . . . . . . . . . . . . . . . . . . . . 1411
VALVE TIMING
DESCRIPTION - TIMING DRIVE SYSTEM
OPERATION - TIMING DRIVE SYSTEM
STANDARD PROCEDURE - ENGINE TIMING
- VERIFICATION . . . . . . . . . . . . . . . . . . . . . 1413
STANDARD PROCEDURE - MEASURING
TIMING CHAIN WEAR . . . . . . . . . . . . . . . . 1417
COVER - TIMING
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1418
. . . . . . . . . . . . . . . . . . . . . . . 1419
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ENGINE - 4.7L SERVICE INFORMATION
WK
TIMING CHAIN & SPROCKETS
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1419
. . . . . . . . . . . . . . . . . . . . . . . . . 1423
. . . . . . . . . . . . . . . . . . . . . . . 1423
SHAFT - IDLER
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1426
. . . . . . . . . . . . . . . . . . . . . . . 1427
ENGINE - 4.7L SERVICE INFORMATION
DESCRIPTION - 4.7L ENGINE
The 4.7 liter (287 CID) eight-cylinder engine is an 90° single overhead camshaft engine. The cast iron cylinder block
is made up of two different components; the first component is the cylinder bore and upper block, the second com-
ponent is the bedplate that comprises the lower portion of the cylinder block and houses the lower half of the crank-
shaft main bearings. The cylinders are numbered from front to rear with the left bank being numbered 1,3,5 and 7,
and the right bank being numbered 2,4,6 and 8. The firing order is 1–8–4–3–6–5–7–2.
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ENGINE - 4.7L SERVICE INFORMATION
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The engine serial number (1) is located at the right
front side of the engine block.
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - ENGINE DIAGNOSIS - INTRODUCTION
Engine diagnosis is helpful in determining the causes of malfunctions not detected and remedied by routine main-
tenance.
These malfunctions may be classified as either performance (e.g., engine idles rough and stalls) or mechanical
(e.g., a strange noise).
(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) - PERFORMANCE and (Refer to 9 - ENGINE - DIAGNOSIS
AND TESTING)—MECHANICAL for possible causes and corrections of malfunctions. (Refer to 14 - FUEL SYSTEM/
FUEL DELIVERY - DIAGNOSIS AND TESTING) and (Refer to 14 - FUEL SYSTEM/FUEL INJECTION - DIAGNO-
SIS AND TESTING) for the fuel system diagnosis.
Additional tests and diagnostic procedures may be necessary for specific engine malfunctions that can not be iso-
lated with the Service Diagnosis charts. Information concerning additional tests and diagnosis is provided within the
following diagnosis:
•
Cylinder Compression Pressure Test (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
•
Cylinder Combustion Pressure Leakage Test (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
•
Engine Cylinder Head Gasket Failure Diagnosis (Refer to 9 - ENGINE/CYLINDER HEAD - DIAGNOSIS AND
TESTING).
•
Intake Manifold Leakage Diagnosis (Refer to 9 - ENGINE/MANIFOLDS/INTAKE MANIFOLD - DIAGNOSIS
AND TESTING).
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ENGINE - 4.7L SERVICE INFORMATION
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DIAGNOSIS AND TESTING - ENGINE DIAGNOSIS - PERFORMANCE
CONDITION
POSSIBLE CAUSE
CORRECTION
ENGINE WILL NOT START
1. Weak battery
1. Charge or replace as necessary.
2. Corroded or loose battery
connections.
2. Clean and tighten battery
connections. Apply a coat of light
mineral grease to the terminals.
3. Faulty starter.
3. (Refer to 8 - ELECTRICAL/
STARTING - DIAGNOSIS AND
TESTING).
4. Faulty coil or control unit.
4. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/IGNITION
COIL - REMOVAL).
5. Incorrect spark plug gap.
5. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/SPARK PLUG
- CLEANING).
6. Dirt or water in fuel system.
6. Clean system and replace fuel
filter.
7. Faulty fuel pump, relay or wiring.
7. Repair or replace as necessary.
ENGINE STALLS OR ROUGH IDLE
1. Idle speed set to low.
1. (Refer to 14 - FUEL SYSTEM/
FUEL INJECTION/IDLE AIR
CONTROL MOTOR - REMOVAL).
2. Idle mixture too lean or too rich.
2. Refer to Powertrain Diagnosis
Information.
3. Vacuum leak.
3. Inspect intake manifold and
vacuum hoses, repair or replace as
necessary.
4. Faulty coil.
4. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/IGNITION
COIL - REMOVAL).
5. Incorrect engine timing.
5. (Refer to 9 - ENGINE/VALVE
TIMING - STANDARD
PROCEDURE).
ENGINE LOSS OF POWER
1. Dirty or incorrectly gapped spark
plugs.
1. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/SPARK PLUG
- CLEANING).
2. Dirt or water in fuel system.
2. Clean system and replace fuel
filter.
3. Faulty fuel pump.
3. Refer to the Appropriate
Diagnostic Information
4. Blown cylinder head gasket.
4. Replace cylinder head gasket.
5. Low compression.
5. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
6. Burned, warped or pitted valves.
6. Replace as necessary.
7. Plugged or restricted exhaust
system.
7. Inspect and replace as
necessary.
8. Faulty coil.
8. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/IGNITION
COIL - REMOVAL).
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ENGINE - 4.7L SERVICE INFORMATION
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