| OIL LEAKS | 1. Gaskets and O-Rings. Misaligned or damaged. | 1. Replace as necessary. |
| 2. Loose fasteners, broken or porous metal parts. | 2. Tighten fasteners, repair or replace metal parts. |
| 3. Crankshaft rear seal | 3. Replace as necessary. See Engine/Engine Block/SEAL, Crankshaft Oil - Removal . |
| 4. Crankshaft seal flange. Scratched, nicked or grooved. | 4. Polish or replace crankshaft. |
| 5. Oil pan flange cracked. | 5. Replace oil pan. See Engine/Lubrication/PAN, Oil - Removal . |
| 6. Timing chain cover seal, damaged or misaligned. | 6. Replace seal. See Engine/Engine Block/SEAL, Crankshaft Oil - Removal . |
| 7. Scratched or damaged vibration damper hub. | 7. Polish or replace damper. See Engine/Engine Block/DAMPER, Vibration - Removal . |
| OIL PRESSURE DROP | 1. Low oil level. | 1. Check and correct oil level. See Engine/Lubrication/OIL - Standard Procedure . |
| 2. Faulty oil pressure sending unit. | 2. Replace sending unit. See Engine/Lubrication/SWITCH, Oil Pressure - Removal . |
| 3. Low oil pressure. | 3. Check oil pump and bearing clearance. See Engine/Lubrication/PUMP, Engine Oil - Inspection . |
| 4. Clogged oil filter. | 4. Replace oil filter. See Engine/Lubrication/FILTER, Engine Oil - Removal . |
| 5. Worn oil pump. | 5. Replace oil pump. See Engine/Lubrication/PUMP, Engine Oil - Removal . |
| 6. Thin or diluted oil. | 6. Change oil and filter. See Engine/Lubrication/FILTER, Engine Oil - Removal . |
| 7. Excessive bearing clearance. | 7. Replace as necessary. See Engine/Engine Block/ROD, Piston and Connecting - Standard Procedure . |
| 8. Oil pump relief valve stuck. | 8. Replace oil pump. See Engine/Lubrication/PUMP, Engine Oil - Removal . |
| 9. Oil pick up tube loose, damaged or clogged. | 9. Replace as necessary. See Engine/Lubrication/PAN, Oil - Removal . |
| OIL PUMPING AT RINGS; SPARK PLUGS FOULING | 1. Worn or damaged rings. | 1. Hone cylinder bores and replace rings. See Engine/Engine Block/RING(S), Piston - Standard Procedure . |
| 2. Carbon in oil ring slots. | 2. Replace rings. See Engine/Engine Block/RING(S), Piston - Standard Procedure . |
| 3. Incorrect ring size installed. | 3. Replace rings. See Engine/Engine Block/RING(S), Piston - Standard Procedure . |
| 4. Worn valve guides. | 4. Inspect the valve guides for wear, cracks or looseness. If either condition exist, replace the cylinder head. See Engine/Cylinder Head - Removal . |
| 5. Leaking valve guide seals. | 5. Replace valve guide seals. Refer to SEAL(S), Valve Guide . |
