User Manual

Page 9-6
200 TROUBLESHOOTING
EXCESSIVE BLUE OR WHITE SMOKE
200776a
EXCESSIVE FUEL CONSUMPTION
200777a
EXCESSIVE OIL CONSUMPTION
200778a
Possible Cause Correction
1. Engine lubricating oil level too high. 1. Drain excess lubricating oil. If the oil is contaminated with either
fuel or coolant, completely drain the oil pan. Change the oil filters.
Locate the source of the leak and correct. Fill with MACK-specified
engine oil. Check the oil level with the dipstick. DO NOT overfill.
2. Turbocharger oil seal failure. 2. Check for oil in the inlet manifold. Install remanufactured
turbocharger.
3. Worn piston rings. 3. Check cylinder walls for scuffing. Clean or replace sleeves as
required. Install new piston rings.
4. Engine misfiring or running rough. 4. Check items as outlined in ENGINE MISFIRES in this section.
5. Incorrect fuel injection pump-to-engine timing. 5. Check and reset timing as required.
Possible Cause Correction
1. Restrictions in the air induction system. 1. Inspect system. Remove restrictions and replace defective parts
as required.
2. External fuel system leakage. 2. Check external piping on fuel system for signs of fuel leakage.
Repair as required.
3. Incorrect fuel injection pump-to-engine timing. 3. Check fuel injection pump-to-engine timing. Reset as required.
4. Defective injection nozzle assembly. 4. Isolate defective nozzle assembly. Repair or replace as required.
5. Incorrect fuel injection pump calibration. 5. Remove injection pump and nozzle assemblies from the engine.
Send the pump to an authorized MACK Fuel Injection System
Repair facility for recalibration. Then reinstall the pump and nozzle
assemblies.
6. Internal engine wear. 6. Overhaul engine.
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. Clogged crankcase breather pipe. 2. Remove obstructions.
3. Excessive exhaust back pressure. 3. Check exhaust pressure. Repair as required.
4. Worn valve guides. 4. Replace valve guides.
5. Air compressor passing oil. 5. Repair or replace air compressor.
6. Turbocharger sealing rings failure. 6. Check for oil in the inlet manifold. Install remanufactured turbocharger.
7. Internal engine wear. 7. Overhaul engine.
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