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
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.
Regular maintenance of the fuel injectors is
recommended by Perkins. The fuel injectors must be
removed and tested by an authorized agent. 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
For further information on the removal and the
installation of the fuel injectors, refer to the
Disassembly and Assembly manual.
For further information on the testing of fuel injectors,
refer to the Testing and Adjusting manual.
Identification of a suspect Fuel
Injector
Work carefully around an engine that is running.
Engine parts that are hot, or parts that are mov-
ing, can cause personal injury.
NOTICE
If your skin comes into contact with high pressure
fuel, obtain medical assistence immediately.
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.
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
injector is loosened.
Consult your authorized Perkins dealer or your
Perkins distributor for further assistance.
i06946788
Fuel System - Prime
(For 1000 Hours Service on
Certain Engine Only)
NOTICE
Care must be taken to ensure that fluids are con-
tained during performance of inspection, mainte-
nance, testing, adjusting and repair of the product.
Be prepared to collect the fluid with suitable contain-
ers before opening any compartment or disassem-
bling any component containing fluids.
Dispose of all fluids according to local regulations
and mandates.
Use the following procedure to prime the fuel system:
If air enters the fuel system, the air must be purged
from the fuel system before the engine can be
started. Air can enter the fuel system when the
following events occur:
• The fuel tank is empty or the fuel tank has been
partially drained.
• The low-pressure fuel lines are disconnected.
• A leak exists in the low-pressure fuel system.
• The fuel filter is replaced.
Primary Filter
Ensure that the air is removed from the primary filter
before you prime the fuel filter. Refer to illustration 63
.
SEBU9064-08
89
Maintenance Section
Fuel System - Prime
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