ENGINE AR 3904674 - Caterpillar

Probable Causes
Water Pump
Engine oil cooler core
Cylinder head gasket
Cylinder head
Cylinder liner
Cylinder blockRecommended Actions
Water Pump
Check for leaks around the seal of the water pump. Look for damage to the seal, the impeller shaft, and the impeller shaft bearings. If a leak is identified, replace the damaged components. Refer to the Disassembly and Assembly manual.
Drain the crankcase and refill the crankcase with clean engine oil. Install new engine oil filters. Refer to the Operation and Maintenance Manual. Engine Oil Cooler Core
Check for leaks in the oil cooler core. If a leak is found, install a new oil cooler core. Refer to the Disassembly and Assembly manual.
Drain the crankcase and refill the crankcase with clean engine oil. Install new engine oil filters. Refer to the Operation and Maintenance Manual. Cylinder Head Gasket
Remove the cylinder head. Refer to the Disassembly and Assembly manual.
Check the cylinder liner projection. Refer to the Systems Operation/Testing and Adjusting manual.
Install a new cylinder head gasket and new water seals in the spacer plate. Refer to the Disassembly and Assembly manual. Cylinder Head
Check for cracks in the cylinder head. If a crack is found, repair the cylinder head and/or replace the cylinder head. Refer to the Disassembly and Assembly manual.Cylinder Liner
Check for cracked cylinder liners. Replace any cracked cylinder liners. Refer to the Disassembly and Assembly manual.Cylinder Block
Inspect the cylinder block for cracks. If a crack is found, repair the cylinder block or replace the cylinder block.