Fuel System - Prime - Perkins 1103 Operation And Maintenance Manual

SEBU7833-03
Removal and Installation of the
Fuel Injectors
Work carefully around an engine that is running.
Engine parts that are hot, or parts that are moving,
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.
Always 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.

Fuel System - Prime

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.
•
A new injection pump is installed.
Use the following procedure in order to remove air
from the fuel system:
1. Ensure that all low pressure fuel connections and
high pressure fuel lines are installed correctly.
2. Turn the ignition key to the RUN position. Leave
the ignition key in the RUN position for three
minutes. If a manual purging screw is installed,
the purging screw should be slackened during
priming the fuel system.
Illustration 44
Typical example
3. Crank the engine with the throttle lever in the
CLOSED position until the engine starts.
Note: If necessary, loosen the union nuts (1) on the
fuel injection lines at the connection with the fuel
injector until fuel is evident. Stop cranking the engine.
Tighten the union nuts (1) to a torque of 30 N·m
(22 lb ft).
4. Start the engine and run the engine at idle for one
minute.
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Do not crank the engine continuously for more than
30 seconds. Allow the starting motor to cool for two
minutes before cranking the engine again.
5. Cycle the throttle lever from the low idle position to
the high idle position three times. The cycle time
for the throttle lever is one second to six seconds
for one complete cycle.
Note: In order to purge air from the fuel injection
pump on Perkins engines with a fixed throttle, the
engine should be run at full load for thirty seconds.
The load should then be decreased until the engine
is at high idle. This should be repeated three times.
This will assist in removing trapped air from the fuel
injection pump.
6. Check for leaks in the fuel system.
Maintenance Section
Fuel System - Prime
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NOTICE
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