Engine Lubrication Diagnostic Table
WARNING: This page is about a different variant/trim than selected.
| CONDITION | POSSIBLE CAUSES | CORRECTION |
|---|---|---|
| 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 the metal parts. | |
| 3. Crankshaft rear oil seal. | 3. Replace rear crankshaft oil seal. Refer to SEAL, CRANKSHAFT OIL, REAR, REMOVAL AND INSTALLATION . | |
| 4. Crankshaft seal flange. Scratched, nicked or grooved. | 4. Polish or replace the crankshaft. | |
| 5. Oil pan flange cracked. | 5. Replace oil pan. Refer to PAN, OIL, REMOVAL AND INSTALLATION . | |
| 6. Damaged or misaligned crankshaft front oil seal. | 6. Replace the crankshaft front oil seal. Refer to SEAL, CRANKSHAFT OIL, FRONT, REMOVAL AND INSTALLATION . | |
| 7. Scratched or damaged vibration damper hub. | 7. Polish or replace the vibration damper. | |
| OIL PRESSURE DROP | 1. Low oil level. | 1. Check and correct oil level. |
| 2. Faulty oil pressure sensor. | 2. Replace the oil pressure sensor. Refer to ENGINE SENSORS, REMOVAL AND INSTALLATION . | |
| 3. Low oil pressure. | 3. Check the main bearing and rod bearing clearances. | |
| 4. Clogged oil filter. | 4. Replace oil filter. Refer to FILTER, ENGINE OIL, REMOVAL AND INSTALLATION . | |
| 5. Worn oil pump. | 5. Replace the oil pump. Refer to PUMP, ENGINE OIL, REMOVAL AND INSTALLATION . | |
| 6. Thin or diluted oil. | 6. Change the oil and filter. Refer to ENGINE OIL AND FILTER CHANGE . | |
| 7. Excessive bearing clearance. | 7. Replace the engine long block. Refer to LONG BLOCK REPLACEMENT . | |
| 8. Oil pump relief valve stuck. | 8. Replace the oil pump. Refer to PUMP, ENGINE OIL, REMOVAL AND INSTALLATION . | |
| 9. Oil pump pick-up loose, damaged or clogged. | 9. Replace the oil pump pick-up. Refer to PICK-UP, OIL PUMP, REMOVAL AND INSTALLATION . | |
| OIL PUMPING AT RINGS | 1. Worn or damaged rings. | 1. Replace the engine long block. Refer to LONG BLOCK REPLACEMENT . |
| 2. Carbon in oil ring slots. | 2. Replace the engine long block. Refer to LONG BLOCK REPLACEMENT . | |
| 3. Worn valve guides. | 3. Replace the cylinder heads. Refer to CYLINDER HEAD ASSEMBLY, REMOVAL AND INSTALLATION . | |
| 4. Leaking valve guide seals. | 4. Replace the valve guide seals. Refer to CYLINDER HEAD ASSEMBLY, DISASSEMBLY AND ASSEMBLY . |