Toyota
Dodge Durango
 Service Manual
Engine » Diagnosis and testing
Service diagnosis-lubrication

CONDITION POSSIBLE CAUSES CORRECTION
OIL LEAKS 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.

(a) Replace as necessary.

(b) Tighten fasteners, Repair or replace metal parts.

2. Replace as necessary

3. Polish or replace crankshaft.

4. Replace oil pan.

5. Replace seal.

6. Polish or replace damper.

OIL PRESSURE DROP 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 or damaged.

1. Check and correct oil level.

2. Replace sending unit.

3. Check pump and bearing clearance.

4. Replace oil filter.

5. Replace as necessary.

6. Change oil and filter.

7. Replace as necessary.

8. Clean or replace relief valve.

9. Replace as necessary

OIL PUMPING AT RINGS; SPARK PLUGS FOULING 1. Worn or damaged rings.

2. Carbon in oil ring slots.

3. Incorrect ring size installed.

4. Worn valve guides

5. Leaking intake gasket.

6. Leaking valve guide seals.

1. Hone cylinder bores and replace rings.

2. Replace rings.

3. Replace rings.

4. Ream guides and replace valves.

5. Replace intake gaskets.

6. Replace valve guide seals.

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