Diagnosis And Testing - Engine Diagnosis - Lubrication
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
| CONDITION | POSSIBLE CAUSES | CORRECTION |
|---|---|---|
| OIL LEAKS | 1. Gaskets and O-Rings. | 1. |
| (a) Misaligned or damaged. | (a) Replace as necessary. | |
| (b) Loose fasteners, broken or porous metal parts. | (b) Tighten fasteners, Repair or replace metal parts. | |
| 2. Crankshaft rear seal | 2. Replace as necessary (Refer to ENGINE/ENGINE BLOCK/CRANKSHAFT OIL SEAL - REAR - REMOVAL) . | |
| 3. Crankshaft seal flange. Scratched, nicked or grooved. | 3. Polish or replace crankshaft. | |
| 4. Oil pan flange cracked. | 4. Replace oil pan (Refer to ENGINE/LUBRICATION/OIL PAN - REMOVAL) . | |
| 5. Timing chain cover seal damaged. | 5. Re-seal timing cover. | |
| 6. Scratched or damaged vibration damper hub. | 6. Polish or replace damper. | |
| OIL PRESSURE DROP | 1. Low oil level. | 1. Check and correct oil level. |
| 2. Faulty oil pressure sending unit. | 2. Replace sending unit (Refer to ENGINE/LUBRICATION/OIL PRESSURE SENSOR/SWITCH - REMOVAL) . | |
| 3. Low oil pressure. | 3. Check oil pump and bearing clearance. | |
| 4. Clogged oil filter. | 4. Replace oil filter (Refer to ENGINE/LUBRICATION/OIL FILTER - REMOVAL) . | |
| 5. Worn oil pump. | 5. Replace oil pump (Refer to ENGINE/LUBRICATION/OIL PUMP - REMOVAL) . | |
| 6. Thin or diluted oil. | 6. Change oil and filter. | |
| 7. Excessive bearing clearance. | 7. Replace as necessary. | |
| 8. Oil pump relief valve stuck. | 8. Replace oil pump (Refer to ENGINE/LUBRICATION/OIL PUMP - REMOVAL) . | |
| 9. Oil pick up tube loose, damaged or clogged. | 9. Replace as necessary. | |
| OIL PUMPING AT RINGS; SPARK PLUGS FOULING | 1. Worn or damaged rings. | 1. Hone cylinder bores and replace rings. |
| 2. Carbon in oil ring slots. | 2. Replace rings (Refer to ENGINE/ENGINE BLOCK/PISTON RINGS - STANDARD PROCEDURE) . | |
| 3. Incorrect ring size installed. | 3. Replace rings (Refer to ENGINE/ENGINE BLOCK/PISTON RINGS - STANDARD PROCEDURE) . | |
| 4. Worn valve guides. | 4. Ream guides and replace valves (Refer to ENGINE/CYLINDER HEAD/INTAKE/EXHAUST VALVES & SEATS - STANDARD PROCEDURE) . | |
| 5. Leaking valve guide seals. | 5. Replace valve guide seals. |