Farymann Diesel 15W Repair Manual page 58

TEST RUN, ADJUSTMENTS
6. Fuel injector, injector nozzle
The injector nozzle injects the fuel in a fine mist
and under a high pressure into the combustion
space. Due to the high mechanical and thermal
stress, the nozzle requires regular maintenance.
Carbon resuides on the nozzle tip are removed
with a brass wire brush.
The spray holes can be cleaned with a special
needle ( Bosch tool ).
To check the injection pressure, connect the
complete injector to a nozzle tester. Follow op-
erating instructions. The fuel must be ejected
evently atomized without drippling at the speci-
fied pressure.
Caution
Keep hands away from nozzle spray ! The spray
can penetrate deep into the flesh of your hand
and destroy the tissues. Diesel fuel can cause
blood poisoning.
If injection pressure is too high or low, it must be
corrected by replacing the shims inside the in-
jector valve.
Procedure :
Unscrew the sleeve nut (1), take of the nozzle
(2), pressure piece (3), valve cone (4) and pres-
sure spring (5). Replace adjustment shims !
Thicker shim => higher pressure
Thinner shim => lower pressure
An alteration of 0.1 mm ( 0.004") will bring a
change of approx. 10 bar ( 145 PSI).
When reassembling take care that the pins on
the pressure piece are correctly located in noz-
zle body and nozzle holder. If the nozzle leaks,
dribbs or does not atomize properly, change the
complete nozzle.
All kinds of repair are not recommended.
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