Fault tracing
Remedial measures
A3.11.18.02
M20-M601C
en / 08.07.1997 BA000727 2/4
Ĺ
Filter differential pressure is too high during starting/pre-lubrication
Possible cause: Remedy:
• Fuel filter is dirty Clean filter; see A5.05.07.12.01.nn
• Differential pressure gauge is defective
• Oil is too cold
• Water in the oil causes greasy emulsion
and oil thickening
• Oil cooler is leaky
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Engine does not reach full speed and/or full power
Possible cause: Remedy:
Governor failure see manufacturer’s instructions in book C:
Governor failures
Filter of fuel limiter (depending on charge air
pressure) is clogged
Fuel system is defective
• Air in the fuel system
• Water in the fuel
• Fuel feed pump is defective Repair or replace pump; see
A5.05.07.13.01.nn
• Fuel filter is clogged Clean filter; see A5.05.07.12.01.nn
• Pressure valve of injection pump is
defective
• Pump plunger is seized
• Nozzle is clogged; nozzle needle is seized For servicing the injection pump, see
A5.05.07.03.01.nn, A5.05.07.08.01.nn
Quantity of combustion air is insufficient
• Air intake filter is clogged see manufacturer’s instructions in book C:
Cleaning
• Air intake ducting is obstructed
• Charge air cooler is fouled For cleaning the charge air cooler see
A5.05.06.04.02.nn
• TTurbocharger is damaged For repair see manufacturer’s instructions in
book C
• Turbocharger is fouled For cleaning the compressor end see
manufacturer’s instructions in book C
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