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Fault
Engine does not start, or starts only with difficulty
Engine starts but does not reach full speed or stalls
Engine idles out of true when warm, misfiring
Engine speed fluctuates during operation
Power output unsatisfactory
Coolant temperature too high, coolant being lost
Lube oil pressure too low
Lube oil pressure too high
Black smoke accompanied by loss of power
Blue smoke
D
D
D
D D D
D D D
D
D
D D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
Troubleshooting table
White smoke
Knocking in the engine
Engine "too loud"
Reason
Fuel tank empty
Fuel cock closed
Air in fuel system
D
Fuel pre-filter / pre-cleaner clogged
D
Condensation in fuel
Air filter clogged
Electric circuit interrupted
Batteries flat
Starter / solenoid switch defective
Start of delivery not correct / incorrectly set
D D
Injection nozzles clogged
Internal damage to engine
(piston seized, possibly caused by water in fuel)
Fuel quality not in accordance with specifications or fueled
D
severely contaminated
Lower idling speed set too low
D D Valve clearance incorrect
Injection nozzles of injection pipes leaking
Too little fuel in tank
Rev. counter defective
Injection nozzles defective or carbonized
D
Engine being asked to do more than it has to
Fuel supply faulty, fuel too warm
Oil level in sump too high
Incorrect rated speed setting
Coolant level too low
Air in coolant circuit
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