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GENERAL INFORMATION
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High Oil Consumption or Excessive
Exhaust Smoke
1. Worn valve guides.
2. Worn valve guide seals.
3. Worn or damaged piston rings.
4. Incorrect piston ring installation.
Low Oil Pressure
1. Low oil level.
2. Worn or damaged oil pump.
3. Clogged oil strainer screen.
4. Clogged oil filter.
5. Internal oil leakage.
6. Oil relief valve stuck open.
7. Incorrect type of engine oil.
High Oil Pressure
1. The lubrication oil pressure valve is stuck and closed.
2. Clogged oil filter.
3. Clogged oil gallery or metering orifices.
No Oil Pressure
1. Low oil level.
2. The lubrication oil pressure valve is stuck and closed.
3. Damaged oil pump.
4. Incorrect oil pump installation.
5. Internal oil leak.
Oil Level Too Low
1. The lubrication oil does not keep at the normal level.
2. Worn piston rings.
3. Worn cylinder.
4. Worn valve guides.
5. Worn valve guide seals.
6. Piston rings incorrectly installed during engine overhaul.
7. External oil leakage.
8. Oil leaking into the cooling system.
