MAK M20 - Filter Differential Pressure too High During Starting;Pre-Lubrication; Engine Does Not Reach Full Speed And;Or Full Power

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Fault tracing

Remedial measures

A3.11.18.02

M20-M601C

en / 08.07.1997 BA000727 2/4

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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