Kohler KD425-2, Workshop Manual

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Technical information
POSSIBLE CAUSES AND TROUBLE SHOOTING
THE ENGINE MUST BE STOPPED IMMEDIATELY WHEN:
1)
- The engine rpms suddenly increase and decrease
2) - A sudden and unusual noise is heard
3) - The colour of the exhaust fumes suddenly darkens
4) - The oil pressure indicator light turns on while running.
TABLE OF LIKELY ANOMALIES AND THEIR SYMPTOMS
The following table contains the possible causes of some failures which may occur during operation.
Always perform these simple checks before removing or replacing any part.
TROUBLE
Engine does not start Engine starts but stops No acceleration Non-uniform speed Black smoke White smoke Too low oil pressure Increase oil level Excessive oil consumption Oil and fuel dripping from exhaust
POSSIBLE CAUSE
FUEL
CIRCUIT
Clogged pipes
Clogged fuel filter
Air inside fuel circuit
Clogged tank breather hole
Faulty fuel pump
Injector jammed
Jammed injection pump delivery valve
Wrong injector setting
Excessive plunger blow-by
Jammed injection pump delivery control
Wrong injection pump setting
LUBRICATION
Oil level too high
Jammed pressure relief valve
Worn oil pump
Air inside oil suction pipe
Faulty pressure gauge or switch
Clogged oil suction pipe
ELECTRIC SYSTEM
Battery discharged
Wrong or inefficient cable connection
Defective ignition switch
Defective starter motor
MAINTE- NANCE
Clogged air filter
Excessive idle operation
Incomplete running-in
Engine overloaded
SETTINGS/REP
AIRS
Advanced injection
Delayed injection
Incorrect governor linkage adjustment
Broken or loose governor spring
Idle speed too low
Worn or jammed piston rings
Worn or scored cylinders
Worn valve guides
Jammed valves
Worn bearings
Governor linkage not free to slide
Drive shaft not free to slide
Damaged cylinder head gasket
KD425-2 Workshop Manual_cod. ED0053031750_
1° ed
_ rev.
00