Craftsman CM4.33 - Page 39

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Subtitle part xxx
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craftsman marine diesel engines CM4.33 / cm4.42
Problem Probable cause Solution
10.
Excessive fuel consump-
tion of engine
• Poor or polluted fuel quality
• Defective injector / injection pump
• Incorrect injection moment
• Excessive wear and tear of cylinder / piston
• Insufcient supply of combustion air
• Check fuel quality. Drain fuel tank and rinse it
well. Fill with good quality fuel
• Check and replace if necessary
• Check / adjust
• Check compression, overhaul engine if neces-
sary
• Check the air intake and the ventilation ope
nings in the engine room
11.
Blue smoke coming out of
the exhaust (when idling)
• Oil level too high
• Excessive inclination angle of the engine
• Leaking oil seal of the turbo compressor
• Lower oil level
• Check / adjust alignment of engine
• Check / replace
12.
Black smoke coming out of
the exhaust (under load)
• Defecte turbocompressor
•
• Insufent supply of combustion air
• Leakage in air intake manifold
• Defective injector / injection pump
• Incorrect injection moment
• Incorrect valve clearance
• Excessive wear and tear of cylinder / piston
• Engine overheated, does not reach maximum rpm
• Check air intake as well as the ventilation
openings in the engine room
• Check/ replace
• Check/ replace
• Check and replace when necessary
• Check/readjust
• Readjust
• Check compression, overhaul the engine if needed.
• Check the dimensions (diameter and pitch)
of the propeller and replace the propeller if
necessary.
13.
Engine produces white
smoke from the exhaust
(at full load)
• Air inclusion in the fuel system
• Defective injector / injection pump
• Water in the fuel system
• Defective pre-heating plugs
• Incorrect valve clearance
• Incorrect injection moment
• Poor fuel quality or polluted fuel
• Condensation of vapour in the exhaust system, on account of very low
ambient temperature
• Check / bleed the system
• Check / replace if necessary
• Check / replace water separator / fuel lter
• Check / replace
• Check / adjust
• Check / adjust
• Check fuel quality. Drain fuel tank and rinse it
well. Fill with good quality fuel
• No problem, no danger
Problems and solutions 14