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Page 62
TROUBLESHOOTING
EXCESSIVE BLUE OR WHITE SMOKE
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION
Possible Cause
Correction
1. Code(s) present.
1. Correct cause of code(s).
2. No code(s) present, faulty cylinder.
2. Isolate faulty cylinder and repair as required.
3. Low fuel pressure.
3. Check fuel lines and filters for blockage.
4. Engine lubricating oil level too high.
4. 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.
5. Turbocharger passing oil.
5. Check for oil in the inlet manifold. Check for air inlet restriction
(clogged air filter). Repair or replace turbocharger as required.
6. Worn piston rings.
6. Determine and correct the root cause, and repair engine as
required.
7. Engine misfiring or running rough.
7. Check items as outlined in ENGINE MISFIRES — NO CODE(S)
chart.
Possible Cause
Correction
1. Code(s) present.
1. Correct cause of code(s).
2. Restrictions in the air induction system.
2. Inspect system. Remove restrictions and replace defective parts
as required.
3. External fuel system leakage.
3. Check external piping on fuel system for signs of fuel leakage.
Repair as required.
4. Defective injection nozzle assembly.
4. Isolate defective nozzle assembly. Repair and replace as
required. Refer to item 8 in ENGINE MISFIRES — NO CODE(S)
chart.
5. Internal engine wear.
5. Determine and correct the root cause, and repair engine as
required.
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. Turbocharger passing oil.
2. 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.
3. Air compressor passing oil.
3. Repair or replace air compressor.
4. Clogged crankcase breather pipe.
4. Remove obstructions.
5. Excessive exhaust back pressure.
5. Check exhaust pressure. Repair as required.
6. Worn valve stem seals.
6. Replace valve stem seals.
7. Worn valve guides.
7. Check for valve guide wear and replace guides as required.
8. Internal engine wear.
8. Determine and correct the root cause, and repair engine as
required.
5_106_00.bk Page 62 Friday, August 4, 2000 11:17 AM
BDC for engine manuals and specs