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TROUBLE LOCATING CHART-contd.
Trouble
Reason
Engine starts
Faulty fuel supply
but fires
intermittently or
soon stops
Faulty compression
Dirty exhaust
Engine lacks
Faulty fuel supply
power and/or
shows dirty
exhaust
Out of adjustment
Dirty engine
Causes
Water in the fuel
Faulty injector nozzle
Fuel filter choked
Air in fuel pipes
Broken valve spring
Sticking valve
Pined valve
Blocked exhaust pipe or similar
Faulty fuel pump Faulty injector nozzle
Unsuitable fuel
Valve clearances incorrect
Fuel timing incorrect
Blocked exhaust pipe or similar Dirty
air cleaner
Faulty piston ring
Excessive carbon on piston and
cylinder head
Worn cylinder or piston
Suggested Remedy
Drain fuel system and fill with clean fuel
Fit new nozzle
Fit new filter element
Bleed the system, if applicable
Fit new spring
Free the valve
Grind or renew
Clean out
Fit new pump
Fit new nozzle
Drain the fuel system and fill with correct fuel
Adjust
Adjust
Clean out
Clean out
Fit new ring
Decarbonise
Overhaul the engine
10
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