Too Much Oil Consumption Engine outside oil leakage Check for leakage at the seals at each end of the crankshaft. Look for leakage at the oil pan gasket and all lubrication system connections. Check to see if oil comes out of the crankcase breather. This can be caused by combustion gas leakage around the pistons. A dirty crankcase breather will cause high pressure in the crankcase, and this will cause gasket and seal leakage. Combustion area oil leakage Oil leakage into the combustion area of the cylinders can be the cause of blue smoke. There are three possible ways for oil leakage into the combustion area of the stems. 1 . Oil leakage between worn valve guides and valve stems. 2 .
Worn or damaged piston rings, or dirty oil return holes. 3 . Compression ring and/or intermediate ring not installed correctly. NOTE : Too much oil consumption can also be the result if oil with the wrong viscosity is used. Oil with a thin viscosity can be caused by fuel leakage into the crankcase, or by increased engine temperature. Low Oil Pressure Before starting the engine, the engine oil light(1) on the instrument panel will turn on when the key switch is turned to the ON position. The light will turn off after the engine is started and while the engine is running, lidicating normal oil pressure.
The light will turn on during operation only when there is insufficient engine oil pressure to properly lubricate the engine’s internal parts. If the oil light comes on, indicating the pressure is low, check for the causes that follow: 1 . Low oil level in the crankcase. 2 . Defect in the oil pressure indicator light or oil pressure sensor unit. 3 . Restriction to oil pump screen. 4 . Leakage at the oil line connections. 5 . Worn connecting rod or main bearings. Worn gears in the oil pump. 6 . Oil pressure relief valve worn or stuck in the OPEN position. 7 . Oil filter bypass valve stuck open. Oil filter is restricted. Replace oil filter.
High Oil Pressure Oil pressure will be high if the oil pressure relief valve in the oil pump cannot move from the closed position. Too Much Component Wear When some components of the engine show bearing wear in a short time, the cause can be a restriction in an oil passage. A broken oil passage can also be the cause. If an oil pressure check is done and the oil pressure is correct, but a component is worn because it does not get enough lubrication, look at the passage for oil supply to that component. A restriction in a supply passage will not let enough lubrication get to a component and this will cause early wear. Instrument Panel (1) Engine Oil Light G643 (E) Service Manual Chapter 3.
Engine Mechanical System 59