TROUBLESHOOTING
75
Problem Possible Cause Remedy
Engine over-speeds
Engine stops unexpectedly
during operation
Engine overheats
Exhaust fumes are white
Exhaust fumes are too black
Poor engine output
Oil pressure monitor is lit during
operation
• Engine oil is getting
into combustion chambers
• Insufficient fuel supply
• Defective fuel injectors
• Defective fuel injection pump
• Engine seizure due to low or
poor oil
• Electric fuel pump not operating
• Insufficient coolant
• Broken or loose fan belt
• Clogged grille, radiator screens
• Clogged radiator fins
• Defective thermostat
• Insufficient engine oil
• Clogged air cleaner
• High engine oil level
• Insufficient fuel delivery
• Cold-running engine
• Poor fuel
• Excessive fuel delivery
• Insufficient fuel injector pressure
• Insufficient combusition air
• Seized fuel injectors
and / or carbon deposit
• Insufficient compression
or leaking valves
• Incorrect valves clearances
• Incorrect fuel injection timing
• Insufficient fuel supply
• Clogged air cleaner
• Insufficient engine oil
• Too low oil viscosity
• Defective pressure switch
• Clogged oil filter
• Defective oil pump
Consult your Dealer
Top up fuel and air-bleed fuel system
Consult your Dealer
Consult your Dealer.
(If engine can be turned by pulling
fan belt, fuel system is most
probable causes)
Replace fuse
Top up coolant
Adjust belt tension or replace
Clean
Clean
Replace
Inspect oil level and replenish
if necessary
Clean or replace element (s)
Inspect oil level and correct
Consult your Dealer
Allow to warm check thermostat
Replace with better grade
Consult your Dealer
Consult your Dealer
Check, clean or replace air filter
Consult your Dealer
Consult your Dealer
Consult your Dealer
Consult your Dealer
Check fuel system
Clean or replace element (s)
Replenish
Replace with oil of proper viscosity
Replace
Replace element cartridge
Consult your Dealer
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