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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
Troubleshooting table
White smoke
Knocking in the engine
Engine "too loud"
Reason
Radiator very dirty
Tension of water-pump V-belts incorrect (slip)
Cap with working valves on expansion tank / radiator
defective or leaking
Temperature gauge defective
Coolant pipes leaking, blocked or twisted
Oil level in sump too low
Engine temperature too high
Oil filter clogged
Oil pressure gauge defective
Selected oil viscosity not suitable for ambient temperature
(oil too thin)
Oil in sump too thin (mixed with condensation or fuel)
Engine cold
Engine, coolant or intake air still to cold
Lube oil getting into combustion chamber
(piston worn, piston rings worn or broken)
Overpressure in crankcase (crankcase breather clogged)
long operation under a low load
Coolant getting into combustion chamber
D
(cylinder head / gasket leaking)
Engine operating temperature incorrect
D
D Intake or exhaust pipe leaking
35
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