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Group 23 Fuel system
Injectors
Changing the injectors
1. Wash around the injectors.
2. Undo the delivery pipes at the injection pump and
at the injectors. Lift the fuel delivery pipes away
together.
3. Undo the nut at the top of each injector, use the
nuts beneath the return fuel line as a counterhold
so that the pipes are not bent. Lift the return fuel
pipe away.
4. Unscrew the injectors (1). Use socket, L=80 mm.
Remove the copper washers (2) beneath the injec-
tors.
5. Fit a protective plug to the injector’s pipe connec-
tion and over the injector nozzle if it is not to be
installed immediately.
6. Install the new injector. Tightening torque, please
refer to the “Technical Data” chapter.
7. Install the return fuel pipe, use the nut underneath
the fuel return pipe to avoid kinking the pipe.
8. Install the pressure pipes. Check that they do not
come out of alignment, and tighten the nuts.
Tightening torque, please refer to the “Technical
Data” chapter.
9. Start the engine and check that no leakage occurs.
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Testing of injectors
Testing is done in an injector tester. During the test,
the opening pressure and sealing are the most impor-
tant things. The spray pattern is more difficult to eval-
uate and does not fully indicate the condition of the
nozzle.
WARNING! Be careful when testing injectors,
avoid getting the fuel jet from an injector on un-
protected parts of your body. The spray has
such great penetration power that it can pene-
trate the skin and cause blood poisoning.
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