C-12 Generator Set Engine Caterpillar

Coolant in Engine Oil

Usage:

C-12 BCY

Probable Causes

Failure of the oil cooler core
Failure of cylinder head gasket
Crack in cylinder head
Cracked cylinder liner
Cylinder liner seals
Water pump

Recommended Actions

Failure of Oil Cooler Cores

Inspect the oil cooler for leaks. Make repairs, as needed. Drain the crankcase. Refill the crankcase with clean lubricant. Change the oil filters.

Failure of Cylinder Head Gasket

Check the cylinder head gasket.

Crack in Cylinder Head

Check for cracks in the cylinder head. Repair the cylinder head and/or replace the cylinder head.

Cracked Cylinder Liner

Check the cylinder liner for cracks. Use a borescope to check the cylinder liner.

Cylinder Liner Seals

Check the liner water seals in the spacer plate. Check the bottom seals on the liner for damage.

Water Pump

Check the weep hole in the water pump for blockage. Check the water pump seals for leakage.

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