Operation and maintenance manual

68 SEBU7833-03
Maintenance Section
Fuel Injector - Test/Change
Ensure that the engine can not be started while
this maintenance is being performed. To help pre-
vent possible injury, do not use the starting motor
to turn the fl ywheel.
Hot engine components can cause burns. Allow
additional time for the engine to cool before mea-
suring/adjusting valve lash clearance.
Ensure that the engine is stopped before measuring
the valve lash. The engine valve lash can be
inspected and adjusted when the temperature of the
engine is hot or cold.
Refer to Systems Operation/Testing and Adjusting,
“Engine Valve Lash - Inspect/Adjust” for more
information.
i02198352
Fuel Injector - Test/Chan ge
Fuel leaked
or spilled onto hot surfaces or electri-
cal components can cause a fire.
NOTICE
Do not allow dirt to enter the fuel system. Thoroughly
clean the area around a fuel system component that
will be disconnected. Fit a suitable cover over discon-
nected fuel system component.
NOTICE
If a fuel injector is suspected of operating outside of
normal para
meters it should be removed by a qualified
technician. The suspect fuel injector should be taken
to an authorised agent for inspection.
The fuel injector (1) in illustration 43 has no fuel
return. The fuel injector (2) has a fuel return.
g01110422
Illustration 43
Typical fu
el Injectors
The fuel injector (1) will need to be removed and the
injector
will need to be checked for performance.
The fuel injectors should not be cleaned as cleaning
with inco
rrect tools can damage the nozzle. The fuel
injectors should be renewed only if a fault with the
fuel injectors occurs. Some of the problems that may
indicat
e that new fuel injectors are needed are listed
below:
•
The engi
ne will not start or the engine is difficult
to start.
•
Not enou
gh power
•
Theenginemisfires or the engine runs erratically.
•
High fuel consumption
•
Black ex
haust smoke
•
The engine knocks or there is vibration in the
engine.
•
Excessive engine temperature