C15 Petroleum Engines Caterpillar

Probable Causes

• Engine oil level

• Engine oil cooler bypass valve

• Engine oil cooler core

• Engine coolant temperature

Recommended Actions

Engine Oil Level

Use the engine oil dipstick to check for the correct oil level. If necessary, add engine oil to the crankcase.

Engine Oil Cooler Bypass Valve

Inspect the components of the engine oil cooler bypass valve for damage. Clean the engine oil cooler bypass valve and clean the bore for the valve. Ensure that the bypass valve is not stuck in the open position. Replace the components of the bypass valve, if necessary. Refer to Systems Operation/Testing and Adjusting, "Lubrication System".

Engine Oil Cooler Core

Check the engine oil cooler core for damage and for plugging. Clean the engine oil cooler core or replace the engine oil cooler core, if necessary.

Engine Coolant Temperature

If a high coolant temperature condition is also occurring, refer to Troubleshooting, "Coolant Temperature Is High".