3406E and 3456 Generator Set Engines Caterpillar

Probable Causes

• Engine oil cooler core

• Cylinder head gasket

• Cylinder head

• Cylinder liner

• Cylinder block

Recommended Actions

Engine Oil Cooler Core

1. Check for leaks in the oil cooler core. If a leak is found, install a new oil cooler core. Refer to Disassembly and Assembly, "Engine Oil Cooler - Remove" for the correct procedure.

2. 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 and Filter - Change" for more information.

Cylinder Head Gasket

1. Remove the cylinder head. Refer to Disassembly and Assembly, "Cylinder Head - Remove" for the correct procedure.

2. Check the cylinder liner projection. Refer to Testing and Adjusting, "Cylinder Liner Projection - Inspect" for more information.

3. Install a new cylinder head gasket and new water seals in the spacer plate. Refer to Disassembly and Assembly, "Cylinder Head - Install" for the correct procedure.

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 Disassembly and Assembly, "Cylinder Head - Install" for the correct procedure.

Cylinder Liner

Check for cracked cylinder liners. Replace any cracked cylinder liners. Refer to Disassembly and Assembly, "Cylinder Liner - Install" for the correct procedure.

Cylinder Block

Inspect the cylinder block for cracks. If a crack is found, repair the cylinder block or replace the cylinder block.