70 SEBU8121
Maintenance Section
Fuel Injector - Test/Change
NOTICE
Only qualified
service personel should perform this
maintenance. Refer to the Service Manual or your au-
thorized Perkins dealer or your Perkins distributor for
the complete v
alve lash adjustment procedure.
Operation of Perkins engines with incorrect valve lash
can reduce eng
ine efficiency, and also reduce engine
component life.
Ensure that t
he engine can not be started while
this maintenance is being performed. To help pre-
vent poss ible 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 ho
t or cold.
Refer to Systems Operation/Testing and Adjusting,
“Engine Val
ve Lash - Inspect/Adjust” for more
information.
i02252440
Fuel Injec tor - Test/C hange
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 ar
ea 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 parameters 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 38 has no fuel
return. This injector is used on electronic engines
only.
g01141215
Illustration 38
Typical ex
ample
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
•
The engine misfires 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
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