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Subtitle part xxx
38
craftsman marine diesel engines CM4.33 / cm4.42
Problem Probable cause Solution
6.
Engine becomes
overheated
• Level of cooling liquid too low
• Raw water seacock closed
• Raw water strainer clogged
• Leakage in raw water entry system
• Defective thermostat
• Cooling liquid pump defective
• Defective impeller of raw water pump
• Defective injector / injector pump
• Oil level too high
• Oil level too low
• Defective oil lter
• Check/top up
• Check and open
• Check / clean
• Check/ replace
• Check / replace
• Check / replace
• Check / replace
• Check and clean or replace if necessary
• Lower oil level
• Top up / Replace
7.
Not all cylinders are perfor-
ming well
• Air in the fuel system
• Fuel lter clogged up by water and/or dirt
• Leakage in fuel supply line or fuel injection line
• Defective injector / injection pump
• Fuel line clogged
• Defective glow plugs
• Incorrect valve tolerance
• Filter of electrical fuel lift pump clogged
• Defective electrical fuel lift pump
• In all these cases, please consult your authori-
zed dealer and ask him to solve the problem
8.
Engine has little or no oil
pressure
• Oil level too low
• Clogged oil lter
• Defective oil pump
• Excessive inclination angle of engine
• Incorrect SAE-specication or quality of lubrication oil
• Oil pressure apparently too low on account of defective oil pressure
switch,sensor or gauge
• To up till corect oil level
• Replace
• Repair / replace
• Check / adjust alignment
• Replace by good quality engine lubricating oil
• Replace defective component
9.
Engine oil cumsumption
excessively
• Oil level too high
• Excessive inclination angle of engine
• Incorrect SAE-specication or quality of lubrication oil
• Leakage in lubrication oil system
• Excessive wear and tear to cylinder or piston
• Insufcient supply of combustion air
• Overload of engine
• Lower the oil level
• Check / adjust alignment
• Replace by good quality lubricating oil
• Repair / replace
• Check compression; overhaul engine, if needed
• Check air inlet and ventilation openings in
engine room
• Check the dimensions of the boat propeller
14 Problems and solutions
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