TROUBLE LOCATING CHART-contd.
Trouble
Reason
Causes
Suggested Remedy
Faulty fuel supply
Water in the fuel
Faulty injector nozzle
Fuel filter choked
Air in fuel pipes
Drain fuel system and fill with clean fuel
Fit new nozzle
Fit new filter element
Bleed the system, if applicable
Faulty compression
Broken valve spring
Sticking valve
Pined valve
Fit new spring
Free the valve
Grind or renew
Engine starts
but fires
intermittently or
soon stops
Dirty exhaust
Blocked exhaust pipe or similar
Clean out
Faulty fuel supply
Faulty fuel pump Faulty injector nozzle
Unsuitable fuel
Fit new pump
Fit new nozzle
Drain the fuel system and fill with correct fuel
Out of adjustment
Valve clearances incorrect
Adjust
Engine lacks
power and/or
shows dirty
exhaust
Dirty engine
Blocked exhaust pipe or similar Dirty
air cleaner
Faulty piston ring
Excessive carbon on piston and
cylinder head
Worn cylinder or piston
Clean out
Clean out
Fit new ring
Decarbonise
Overhaul the engine
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