GUARD AS 1078533 - Caterpillar

Probable Causes
Engine oil cooler core
Cylinder head gasket
Cylinder head
Cylinder blockRecommended Actions
Engine Oil Cooler Core
Drain the engine lubricating oil from the engine.
Check for leaks in the oil cooler core. Refer to Systems Operation, Testing and Adjusting, "Engine Oil Cooler - Inspect" for the correct procedure. If a leak is found, install a new oil cooler core. Refer to Disassembly and Assembly, "Engine Oil Cooler - Remove" and Disassembly and Assembly, "Engine Oil Cooler - Install" for the correct procedures. Install new seals between the oil cooler and the oil cooler cover. Cylinder Head Gasket
Remove the cylinder head. Refer to Disassembly and Assembly, "Cylinder Head - Remove" for the correct procedure.
Inspect the cylinder head gasket for faults and any signs of leakage. Cylinder Head
Check the cylinder head for flatness. Refer to Systems Operation, Testing and Adjusting, "Cylinder Head - Inspect" for the correct procedure.
Check for cracks in the cylinder head. If a crack is found, repair the cylinder head and/or replace the cylinder head.
If the cylinder head is flat and if the cylinder head is not cracked then refer to the recommended actions for the Cylinder Block. Cylinder Block
Inspect the cylinder block for cracks. Refer to Systems Operation, Testing and Adjusting, "Cylinder Block - Inspect". If a crack is found, repair the cylinder block or replace the cylinder block. Note: The following steps are applicable to 3056E engines only.
Check the cylinder liner projection. Refer to Systems Operation, Testing and Adjusting, "Cylinder Liner Projection - Inspect" for more information. Correct the cylinder liner projection if it is incorrect.
If any of the cylinder liner projections were incorrect and this had resulted in the failure of the head gasket, install a new head gasket. Install the cylinder head. Refer to Disassembly and Assembly, "Cylinder Head - Install" for the correct procedure.