COVER GP-CYLINDER HEAD 3554098 - Caterpillar

Engine Oil Leaks on the Outside of the Engine
Check for leakage at the seals at each end of the crankshaft. Look for leakage at the gasket for the engine oil pan and all lubrication system connections. Look for any engine oil that may be leaking from 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. A dirty crankcase breather will cause the gaskets and the seals to leak.Engine Oil Leaks into the Combustion Area of the Cylinders
Engine oil that is leaking into the combustion area of the cylinders can be the cause of blue smoke. There are several possible ways for engine oil to leak into the combustion area of the cylinders:
Leak between worn valve guides and valve stems
Worn components or damaged components (pistons, piston rings)
Oil leaks in the combustion area of the cylinders
Incorrect oil viscosity
Condition of turbocharger
Incorrect installation of the compression ring and/or the intermediate ring
Overfilling of the crankcase
Wrong oil level gauge or guide tube
Sustained operation at light loadsRefer to Troubleshooting, Oil Consumption is Excessive for troubleshooting steps.