MAK M20 - Exhaust Gases Are Blue; Exhaust Gases Are White

Fault tracing
Remedial measures
A3.11.18.02
M20-M601C
en / 08.07.1997 BA000727 4/4
Ĺ
Exhaust gases are blue
Possible cause: Remedy:
Oil in the combustion chamber
• Piston rings are sticking For servicing the pistons and rings see,
A5.05.02.07.01.nn
• Severe wear and tear of cylinder liner: For checking the cylinder liners see
scoring, ovality A5.05.03.03.01.nn
• Valve guide and/or seal are worn For checking the valve guide clearance see
A5.05.01.05.01.nn
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Exhaust gases are white
Possible cause: Remedy:
• Exhaust gas condensation due to low
ambient temperatures
• Part of the fuel is unburnt because the For engine warm-up see A3.05.18.nn
engine is too cold
• Water in the fuel
• Water in the charge air manifold see A3.06.06.nn „Charge air cooler“
• Leakages in the cylinder head For replacement of cooled valve seat inserts
see A5.05.01.08.03.nn
• Cylinder head is cracked
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