C13 Industrial Engine Caterpillar

Emulsion is a mixture of oil and water. The water occurs when condensation forms in the engine during certain operating and seasonal conditions. The emulsion may appear light in color. Emulsion may be found in the following areas:

• Engine oil filler

• Engine oil level gauge

• Valve cover

• Crankcase ventilation system

The emulsion should disappear with increased engine operating temperatures at higher load conditions.

Probable Causes

• Leaks in the core of oil cooler

• Leaks in the core of the NRS cooler

• Cracks in the turbocharger housing or center section

• Leaks in the cylinder head gasket

• Damaged water seals

• Cracks in the cylinder head

• Cracks in a cylinder liner

• Liner seals

• Cracks in the cylinder block

Recommended Actions

Table 1

Troubleshooting Test Steps	Values	Results
1. Leaks in Core of Oil Cooler A. Check for leaks in the oil cooler core.	Oil cooler	Result: The oil cooler is leaking. Repair or replace the oil cooler. Proceed to Test Step 9. Result: The oil cooler is not leaking. Proceed to Test Step 2.
2. Exhaust (NRS) Cooler A. Check the NRS cooler for leaks. Refer to Testing and Adjusting, "Exhaust Cooler (NRS) - Test".	NRS cooler	Result: The exhaust (NRS) cooler is leaking. Repair or replace the exhaust (NRS) cooler. Proceed to Test Step 9. Result: The exhaust (NRS) cooler is not leaking. Proceed to Test Step 3.
3. Liquid Cooled Turbochargers A. Inspect the turbocharger housing and center section for cracks.	Turbocharger	Result The turbocharger housing or center section has cracks. Make any repairs, as required. Proceed to Test Step 9. Result The turbocharger housing or center section does not have cracks. Proceed to Test Step 4.
4. Leaks in the Cylinder Head Gasket A. Inspect the cylinder head gasket for leaks.	Head gasket	Result The cylinder head gasket is leaking. Replace the cylinder head gasket. Proceed to Test Step 9. Result The cylinder head gasket is not leaking. Proceed to Test Step 5.
5. Damaged Water Seals A. Inspect the water seal for damage.	Water seals	Result The water seal is damaged. Repair or replace the damaged seal. Proceed to Test Step 9. Result The water seal is not damaged. Proceed to Test Step 6.
6. Cracks in the Cylinder Head A. Check for cracks in the cylinder head.	Cylinder head	Result The cylinder head is damaged. Repair or replace the damaged cylinder head. Proceed to Test Step 9. Result The cylinder head is not damaged. Proceed to Test Step 7.
7. Cracks in a Cylinder Liner A. Check for cracked cylinder liners. B. Check the liner seals for damage.	Cylinder liner and seals	Result The cylinder liner or seal is damaged or cracked. Repair or replace the damaged cylinder liner and seal. Proceed to Test Step 9. Result The cylinder liner or seal is not damaged or cracked. Proceed to Test Step 8.
8. Cracks in the Cylinder Block A. Inspect the cylinder block for cracks.	Cylinder liner	Result The cylinder block is cracked. Repair or replace the damaged cylinder block. Proceed to Test Step 9.
9. Pressurize the Cooling System A. Pressurize the cooling system. Refer to Systems Operation/Testing and Adjusting, "Cooling System - Test".	Leaks	Result: The test indicates a drop in pressure. The leak still exists. Make any repairs, as required. Proceed to Test Step 10. Result: The test indicates that there is not a drop in pressure. Proceed to Test Step 10.
10. Change the Engine Oil A. Drain the engine oil. B. Refill the engine with clean oil. C. Run the engine until the engine is at normal operating temperature. D. Drain the engine oil, replace the oil filters, and refill the engine with clean oil.	Oil	Result: The engine oil was changed. Return the unit to service.

Complete the procedure in the order in which the steps are listed.