FORK 9V6774 - Caterpillar

Probable Causes
Oil Level
Incorrect oil level in the crankcaseOil Leaks
Oil leaks on the outside of the engine
Oil leaks in the combustion area of the cylindersOil Viscosity
Incorrect oil viscosityTurbocharger
Condition of turbochargerRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.Excessive Oil in the Crankcase
Check the engine oil level. Too much oil in the engine crankcase can cause the engine to consume oil.Ensure that the dipstick is properly calibrated and/or that the dipstick is correct for the application. Calibrate the dipstick and/or replace the dipstick. Refer to Systems Operation/Testing and Adjusting, "Lubrication System" for calibration of the dipstick gauge. Remove excessive engine oil from the crankcase.Oil Leaks on the Outside of the Engine
Check for oil leaks on the outside of the engine. Refer to Systems Operation/Testing and Adjusting, "Lubrication System".Oil Leaks in the Combustion Area of the Cylinder
Check for oil leaks in the combustion area of the cylinders. Check for excessive engine blowby. Excessive engine blowby will cause unnecessary oil consumption. Excessive engine blowby can also cause unnecessary engine wear.Oil Viscosity
Excessive consumption of engine oil can also result if engine oil with the wrong viscosity is used. Engine oil with a thin viscosity can be caused by fuel leakage into the crankcase or by increased engine temperature. Refer to the Operation and Maintenance Manual for additional information. Condition of Turbocharger
Check the turbocharger for leakage.