Group 22 Service procedures - fuel system
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11
Injectors, reconditioning
1
Clean the outside of the injector.
2
Dismantle the injector. Pull the injector needle out of the dif-
fuser and place the items in gasoline. If several diffusers are
cleaned at the same time, make sure that the prematched
needles and diffuser sleeves are not mixed up with others.
To avoid this, the diffusers should be placed in order on an
diffuser rack or in different compartments.
3
Wash all the parts in a sonic cleaner. Blow them dry with
compressed air.
4
Check the injector thoroughly. This should be done with a
illuminated magnifying glass or injector microscope. The dif-
fuser sleeve can also be examined under the microscope. If
the seat is dented, the diffuser needle must be replaced to-
gether with the sleeve or, in cases of less damage, it may be
lapped in a lapping or diffuser grinding machine.
5
Check the other parts.
6
Dip the diffuser parts in clean diesel or calibration oil.
7
Reinstall, adjust opening pressure and check spray pattern
Refit the fuel tank return pipe together with the brackets
between the injector and the injection pump.
12
Remove all protective caps from the injectors and pressure
valves.
13
Fit the delivery pipes together with clamps and brackets.
14
Fit the fuel return pipes using new copper washers. Bleed
the fuel system and start the engine.
15
Check all connections for leakage.
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