C9.3 Engines for Caterpillar Built Machines Oil Consumption Is Excessive Caterpillar

Oil Consumption Is Excessive

C9.3 Engines for Caterpillar Built Machines [KENR5393]

C9.3 Engines for Caterpillar Built Machines Inlet Air Is Restricted

C9.3 Engines for Caterpillar Built Machines Power Is Intermittently Low or Power Cutout Is Intermittent

LUBRICATION SYSTEM

C9.3 Engines for Caterpillar Built Machines Oil Pressure Is Low

C9.3 Engines for Caterpillar Built Machines Coolant Contains Oil

C9.3 Engines for Caterpillar Built Machines Oil Consumption Is Excessive

C9.3 Engines for Caterpillar Built Machines Exhaust System Contains Oil

C9.3 Engines for Caterpillar Built Machines Oil Contains Coolant

C9.3 Engines for Caterpillar Built Machines Oil Contains Fuel

Probable Causes

Oil Level
Oil Leaks
Oil Viscosity
Turbocharger

Recommended Actions

Note: The procedures have been listed in order of probability. Complete the procedures in order.

Show/hide table

Table 1
Troubleshooting Test Steps	Values	Results
1. Excessive Oil in the Crankcase A. Check the engine oil level. Too much oil in the engine crankcase can cause the engine to consume oil. B. Ensure that the dipstick is properly calibrated and/or that the dipstick is correct for the application.	Oil	Result: There is excess oil in the crankcase. Repair: Remove excess oil in the crankcase. Result: There is no excess oil in the crankcase. Proceed to Test Step 2.
2. Oil Leaks on the Outside of the Engine A. Check for oil leaks on the outside of the engine. Refer to Systems Operation/Testing and Adjusting, "Lubrication System".	Oil Leaks	Result: There are oil leaks on the outside of the engine. Repair: Repair or replace any damaged or worn components. Result: There are no oil leaks on the outside of the engine. Proceed to Test Step 3.
3. Oil Leaks in the Combustion Area of the Cylinder A. Check for oil leaks in the combustion area of the cylinders. B. Check for excessive engine blowby. Excessive engine blowby will cause unnecessary oil consumption. Excessive engine blowby can also cause unnecessary engine wear.	Oil Leaks	Result: There are oil leaks in the combustion area of the cylinder. Repair: Repair or replace any damaged or worn components. Result: There are no oil leaks in the combustion area of the cylinder. Proceed to Test Step 4.
4. Oil leakage At the Injector A. Check for the excessive transfer of oil from the high-pressure oil supply in the injector to the fuel return in the cylinder head.	Oil Leakage	Result: There is an excessive amount of oil at the injector. Repair: Repair or replace damaged or worn components. Result: There is not an excessive amount of oil at the injector. Proceed to Test Step 5.
5. Oil Viscosity A. Excessive consumption of engine oil can also result if engine oil with the wrong viscosity is used. Engine oil with a thin viscosity can be caused by fuel leakage into the crankcase or by increased engine temperature. Refer to the Operation and Maintenance Manual for additional information.	Oil	Result: The oil does not have the correct viscosity. Repair: Change the oil. Result: The oil has the correct viscosity. Proceed to Test Step 6.
6. Condition of Turbocharger A. Check the turbocharger for leakage.	Leakage	Result: The turbocharger is leaking. Repair: Replace the turbocharger. Return the unit to service.