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 parameters it should be removed by a quali-
fied technician. The suspect fuel injector should be
taken to an authorised agent for inspection.
The fuel injector (1) in illustration 47 has no fuel
return. The fuel injector (2) has a fuel return.
Illustration 47 g01110422
Typical fuel 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 incorrect 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
indicate that new fuel injectors are needed are listed
below:
• The engine will not start or the engine is difficult to
start.
• Not enough power
• The engine misfires or the engine runs erratically.
• High fuel consumption
• Black exhaust smoke
• The engine knocks or there is vibration in the
engine.
• Excessive engine temperature
Removal and Installation of the Fuel
Injectors
Work carefully around an engine that is running.
Engine parts that are hot, or parts that are mov-
ing, can cause personal injury.
Make sure that you wear eye protection at all
times during testing. When fuel injection nozzles
are tested, test fluids travel through the orifices of
the nozzle tip with high pressure. Under this
amount of pressure, the test fluid can pierce the
skin and cause serious injury to the operator. Al-
ways keep the tip of the fuel injection nozzle
pointed away from the operator and into the fuel
collector and extension.
NOTICE
If your skin comes into contact with high pressure
fuel, obtain medical assistence immediately.
Operate the engine at a fast idle speed in order to
identify the faulty fuel injector. Individually loosen and
tighten the union nut for the high pressure pipe to
each fuel injector. Do not loosen the union nut more
than half a turn. There will be little effect on the
engine speed when the union nut to the faulty fuel
injection nozzle is loosened. Refer to the
Disassembly and Assembly Manual for more
information. Consult your authorized Perkins dealer
or your Perkins distributor for assistance.
70 SEBU7833
Refill Capacities
Fuel Injector - Test/Change
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