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C-10, C-12, C-15 and C-16 Industrial Engines – Coolant in Engine Oil

Probable Causes

  • Water pump

  • Engine oil cooler core

  • Water-cooled turbocharger

  • Cylinder head gasket

  • Cylinder head

  • Cylinder liner

  • Cylinder block

Recommended Actions

Table 1
Troubleshooting Test Steps     Values     Results    
1. Water pump

A. Check the weep hole in the water pump for blockage.

B. Check the water pump seals.
   

 Water pump
   		 Result : The water pump is leaking.

Repair: Replace the water pump. Refer to the Disassembly and Assembly manual for more information.

Result : The water pump is not leaking.

Proceed to Test Step 2.
   
2. Check for leaks in the oil cooler core.
   		 Oil cooler core
   		 Result: No leak is found in the oil cooler core.

Proceed to Test Step 3.

Result: There is a leak found in the oil cooler core.

Repair: Replace the oil cooler core.
   
3. If the engine is equipped with a water-cooled turbocharger, inspect the turbocharger for cracks.
   		 Turbocharger
   		 Result: The turbocharger is not cracked.

Proceed to Test Step 4.

Result: The turbocharger is cracked.

Repair: Replace the turbocharger. Refer to the Disassembly and Assembly Manual for more information.
   
4. Check the cylinder liner projection.
   		 Liner projection
   		 Result: Cylinder liner projection is OK.

Proceed to Test Step 5.

Result: Cylinder liner projection is NOT OK.

Repair: Install a new cylinder head gasket and new water seals in the spacer plate. Refer to the Disassembly and Assembly manual.
   
5. Check for cracks in the cylinder head.
   		 Cracks in cylinder head
   		 Result: There are no cracks in the cylinder head.

Proceed to Test Step 6.

Result: There are cracks in the cylinder head.

Repair: Repair the cylinder head and/or replace the cylinder head. Refer to the Disassembly and Assembly manual.
   
6. Check for cracked cylinder liners.
   		 Cracks in cylinder liners
   		 Result: There are no cracks in the cylinder liners.

Proceed to Test Step 7.

Result: There are cracks in the cylinder liners.

Repair: Replace any cracked cylinder liners. Refer to the Disassembly and Assembly manual.
   
7. Inspect the cylinder block for cracks.
   		 Cracks in cylinder block.
   		 Result: The cylinder block is not cracked.

STOP

Result: The cylinder block is cracked.

Repair: Repair the cylinder block or replace the cylinder block.

STOP