Fuel Injector
Maintenance / Adjust
A5.05. 07.08.01.02
M20
en / 31.05.2010 IB026393 2/2
07
Sequence of operations:
1. Remove carbon deposits from the nozzle
with a hard brush (no wire brush).
2. Check the nozzle hole for sharp edges,
ovalization, corrosion and damage.
3. Place the injector with the adapter (W2) in
the tester (W1).
4. Connect the injector delivery pipe (W3).
5. Increase the pressure by means of the
pump until the nozzle opens.
Determine injector opening pressure
and free passage of the nozzle holes.
5.1 For adjusting the opening pressure
slacken the lock nut (1) and turn the
adjusting screw (2) until the correct
opening pressure is adjusted (see 5.2 and
5.3). Tighten the lock nut (1).
5.2 When using a new fuel injector or a new
nozzle element (8) and a new nozzle
spring (4) the nozzle opening pressure
is to be adjusted according to the
testbed record (A1.10.).
5.3 When continuing to use the old nozzle
element (8) and/or the old nozzle spring
(4) the opening pressure is to be adjusted
according to the testbed record value
(A1.10.) minus 10%.
Ptest = 500 bar - 10% = 450 bar
NOTE
If a high portion of fuel is lea-
king or if the nozzle holes are
clogged and the nozzle alrea-
dy opens below the minimum
nozzle opening pressure of
330 bar, repair or replace the
injector according to
(07.09.01.nn).
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