OM 803 us – Edition 3.7 * 803b410.fm 4-1
Malfunctions
4 Malfunctions
The information given in this chapter is provided for maintenance personnel, for fast and
reliable detection of malfunctions and their appropriate repair.
Repairs must only be performed by authorized personnel.
4.1 Engine trouble
Problem Possible causes See
Engine does not start or is not easy to start
Wrong SAE grade of engine lubrication oil 5-35
Fuel grade does not comply with specifications 5-35
Malfunctioning or empty battery 5-30
Loose or oxidized cable connections in starter circuit
Malfunctioning starter, or pinion does not engage
Wrong valve clearance
Malfunctioning injection nozzle
Malfunctioning cutoff solenoid
Malfunctioning fuse
Engine starts, but does not run smoothly or faultless
Fuel grade does not comply with specifications 5-35
Dirty fuel filter
Wrong valve clearance
Air in fuel system
Injection line leaks
Malfunctioning injection nozzle
Engine overheats. Temperature warning system
responds
Oil level too low 5-7
Oil level too high 5-7
Dirty air filter 5-12
Dirty oil radiator fins 5-8
Coolant level too low
Cooling system leaks
Malfunctioning fan, torn or loose V-belt 5-15
Resistance in cooling system too high, flow capacity too low
Malfunctioning injection nozzle
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