Fuel Injector
Maintenance / Adjust
A5.05. 07.08.01.00
M20
en / 03.06.1998 IB001410 1/2
07
Ĺ
See also: 07.07.01.nn, 07.09.01.nn
Spare parts list: B1.05.07.2.2267
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 1.9470-51
ĭ Safety note:
When checking the opening pressure: Danger! Keep your hands off the fuel jet!
Note:
Carbon trumpets at the nozzle are mostly caused by insufficient cooling. Corrosive attack
and erosion, however, are the consequence if the nozzle temperature is too low.
The charge air temperature may also be too low or water in the charge air.
The perfect functioning of the injection nozzles can only be judged on the basis of the ex-
haust gas temperatures or the smoke emission.
The injection valve should only be inspected if there is a clear deviation of the exhaust gas
temperature from the mean value.
With heavy fuel nozzles the cause of bad atomization on the test rig frequently is
insufficient flushing of the injector with diesel oil. Before replacing the nozzle this should
be cleaned and checked again very carefully.
A drop in the opening pressure of up to 20 bar after a short period of operation is normal
(set of nozzle spring and needle).
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