Fuel Injector
Maintenance / Adjust
A5.05. 07.08.01.01
M20
en / 31.05.2010 IB026385 1/2
07
See also: 07.07.01.nn, 07.09.01.nn
Spare parts list: B1.05.07.2.2267, B1.05.07.2.2260
Time requirement: 1 Pers./ 0,50 h
Personnel qualification: skilled engine hand
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Operating medium: Heavy fuel and distillate fuel
Tools:
Nozzle tester W1 1.9470 B
Adapter/Nozzle holder - nozzle tester W2 2.9208 A
Pressure pipe W3 1.9470-051
DANGER
When checking the opening pressure: Risk of accident! Keep your hands off the fuel
jet!
NOTE
Proper function of the injection nozzlescan only be assessed from the behaviour of
the exhaust gas temperatures or smoke emission behaviour.
The fuel injector should only be checked in case of a significant deviation of the
exhaust gas temperature from the respective cylinder value. For this purpose
the nozzle tester is provided, which can also be used for checking the nozzle
holes for unobstructed passage.
By means of the nozzle tester the behaviour of the nozzle in operation cannot be
reproduced, because the flow rates and the related pressure build-up are not compa-
rable with the real conditions on the engine, i.e. the spray pattern alone gives no indi-
cation of the function of the nozzle.
On the nozzle tester the specified opening pressure is to be adjusted after assembly
of the nozzle.
A drop in opening pressure after a short operating time (setting of nozzle spring and
needle) is normal.
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