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Problem
4.
Engine starts running but
with irregular cycles or it
stops again
5.
Engine does not arrive
at maximum revolutions
under full load
Probable cause
• Empty fuel tank
• Air in the fuel system
• Fuel filter clogged up with water and/or dirt
• Leaking fuel supply or fuel injection line
• Defective injector/injection pump
• Breather line of fuel tank clogged up
• Fuel line clogged
• Incorrect valve clearance
• Idling revolutions too low
• Exhaust clogged up
• Poor fuel quality or polluted fuel
• Filter of electrical fuel lift pump is clogged
• Air in the fuel system
• Fuel filter clogged up with water and/or dirt
• Leakage in fuel supply line or fuel injection line
• Setting of stop valve incorrect
• Oil level too high
• Incorrect SAE-specification or quality of lubrication oil
• Incorrect valve clearance
• Clogging in the exhaust
• Insufficient quantity of combusition air
• Poor fuel quality or polluted fuel
• Incorrect injection moment
• Leakage of air intake manifold
• Engine overload
Problems and solutions 14
Solution
• Fill it
• Check / bleed the system
• Check / clean or replace
• Check and replace, if necessary
• Check and clean or replace
• Check /remove blockage
• Check / remove blockage
• Readjust
• Readjust
• Check / remove blockage
• Check fuel quality.
Drain fuel tank and rinse it well.
Fill with good quality fuel
• Check / clean
• Check and bleed the system
• Clean or replace
• Check and replace, if necessary
• Check / reset
• Drain suffcient oil quantity
• Replace by engine lubrication oil of good
quality
• Adjust
• Check / remove clogging
• Check air inlet and ventilation openings in
engine room
• Check fuel quality.
Drain fuel tank and rinse it well. Fill with good
quality fuel
• Check / readjust
• Replace manifold
• Check dimensions of boat propeller
craftsman marine diesel engines CM4.33 / cm4.42
Title part xxx
Subtitle part xxx
37
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