Dodge Dakota Sport 2001 Service Manual page 1157

9 - 128 ENGINE 4.7L
ENGINE 4.7L (Continued)
DIAGNOSIS AND TESTING - ENGINE DIAGNOSIS - LUBRICATION
CONDITION
OIL LEAKS
OIL PRESSURE DROP
POSSIBLE CAUSES
1. Gaskets and O-Rings.
(a) Misaligned or damaged.
(b) Loose fasteners, broken or
porous metal parts.
2. Crankshaft rear seal
3. Crankshaft seal flange.
Scratched, nicked or grooved.
4. Oil pan flange cracked.
5. Timing chain cover seal,
damaged or misaligned.
6. Scratched or damaged vibration
damper hub.
1. Low oil level.
2. Faulty oil pressure sending unit.
3. Low oil pressure.
4. Clogged oil filter.
5. Worn oil pump.
6. Thin or diluted oil.
7. Excessive bearing clearance.
8. Oil pump relief valve stuck.
9. Oil pump suction tube loose,
damaged or clogged.
CORRECTION
1.
(a) Replace as necessary.
(b) Tighten fasteners, Repair or
replace metal parts.
2. Replace as necessary (Refer to 9
- ENGINE/ENGINE BLOCK/
CRANKSHAFT OIL SEAL - REAR -
REMOVAL).
3. Polish or replace crankshaft.
4. Replace oil pan (Refer to 9 -
ENGINE/LUBRICATION/OIL PAN -
REMOVAL).
5. Replace seal (Refer to 9 -
ENGINE/ENGINE BLOCK/
CRANKSHAFT OIL SEAL - FRONT
- REMOVAL).
6. Polish or replace damper.
1. Check and correct oil level.
2. Replace sending unit (Refer to 9
- ENGINE/LUBRICATION/OIL
PRESSURE SENSOR/SWITCH -
REMOVAL).
3. Check oil pump and bearing
clearance.
4. Replace oil filter (Refer to 9 -
ENGINE/LUBRICATION/OIL FILTER
- REMOVAL).
5. Replace oil pump (Refer to 9 -
ENGINE/LUBRICATION/OIL PUMP
- REMOVAL).
6. Change oil and filter.
7. Replace as necessary.
8. Replace oil pump (Refer to 9 -
ENGINE/LUBRICATION/OIL PUMP
- REMOVAL).
9. Replace as necessary.
AN