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9LD Workshop Manual _ cod. 1.5302.286 - 3° ed_rev. 02
2
Obstructed fuel line
Fuel filter clogged
Air or water leaks in fuel system
The tank cap vent hole is clogged
No fuel
Faulty fuel feeding pump
Extra fuel control level sticking
TROUBLE SHOOTING
FUEL
CIRCUIT
POSSIBLE CAUSE
SETTINGS REPAIRS
Inadequate
performance
High noise
level
Overheats
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.
PROBLEM
Engine does
not start
Engine starts
but stops
No
acceleration
Non-uniform
speed
Black smoke
White
smoke
Oil preassure
too low
Excessive oil
consumption
COOLING
CIRCUIT
Incorrect governor linkage
adjustment
Governor spring broken or
unhooked
Low idle speed
Rings worn or sticking
Worn cylinder
Worn main con rod-rocker arm
bearings
Badly sealed intake valve
Head tightening nuts loose
Damaged cylinder head gasket
Excessive valve-rocker arm
clearance
No clearance between valves and
rocker arms
Valves sticking or damaged
Defective timing system
Bent rods
Crankshaft not turning freely
Clogged air filter
Cooling circuit clogged
TECHNICAL INFORMATION
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