TROUBLESHOOTING
Page 95
EXCESSIVE OIL CONSUMPTION
ENGINE OVERHEATS
Possible Cause Correction
1. External oil leaks. 1. Check engine for visible signs of oil leakage. Look for loose or
stripped oil drain plugs, broken gaskets (cylinder head cover, etc.),
and front and rear oil seal leakage.
2. Seal leak past EGR valve piston shaft. 2. Inspect EGR valve for oil loss over exhaust manifold. Replace
EGR valve to correct.
3. External oil line leakage (J-Tech™, turbo, EGR
feeds, etc.).
3. Check lines, hoses and connections for leaks. Ensure connections
are at proper torque specifications. Replace any hoses or lines
found to be leaking. Replenish oil.
4. Turbocharger passing oil. 4. Check for oil in the inlet manifold. Check for excessive inlet
restriction (such as a dirty air filter). Repair/replace air filter or
turbocharger as required.
5. Air compressor passing oil. 5. Repair or replace air compressor.
6. Clogged crankcase breather pipe. 6. Remove obstructions.
7. Excessive exhaust back-pressure. 7. Check exhaust pressure. Repair as required.
8. Worn valve stem seals. 8. Replace valve stem seals.
9. Worn valve guides. 9. Check for valve guide wear and replace guides as required.
10. Internal engine wear. 10. Determine and correct the root cause, and repair engine as
required.
Possible Cause Correction
1. Coolant level low. 1. Locate cause. Look for leaking gaskets or loose or leaking hoses.
Repair, replace or tighten as required. Replenish coolant.
2. EGR cooler coolant leak. 2. Replacement of the EGR cooler is required as no weld repairs are
allowed to this stainless steel unit.
3. Loose or worn fan belts. 3. Adjust belt tension or replace belts as required.
4. Restricted airflow through radiator. 4. Remove any restrictions from the outer surface of the radiator.
5. Plugged radiator core. 5. Remove, repair or replace radiator as required.
6. Defective radiator pressure cap. 6. Test pressure of the radiator cap. Replace cap if required.
7. Defective coolant thermostat or temperature
gauge.
7. Check opening temperature of thermostat. Check for correct
installation. Check temperature gauge and sending unit. Replace if
defective.
8. Viscous (or ON/OFF) fan drive not operating
properly, or fan improperly positioned.
8. Check fan operation. Repair as required.
9. Combustion gases in coolant. 9. Determine point where gases are entering the cooling system.
Repair or replace parts as required.
10. Defective water pump. 10. Remove, repair and reinstall water pump as required.
11. Plugged oil cooler. 11. Remove oil cooler. Disassemble, remove restrictions/replace parts
as required. Reinstall.
12. Plugged oil cooler filter screen. 12. Remove the Y-shaped hose at the oil cooler inlet. Remove and
clean the filter screen or replace parts as required. Reinstall.
13. Winterfront (if equipped) not opened. 13. Open or remove winterfront at specified ambient temperatures.
14. Shutters not opening properly (for chassis
equipped with shutters).
14. Check shutter operation. Repair as required.
5-111.bk Page 95 Monday, July 10, 2006 2:26 PM
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