Workshop Manual

TCD 2015
Fuel system
W 07-07-05
© 06/2006 8221-001
4/6
6
z If the injection nozzle drips, the fuel injector must be
dismantled or exchanged.
 W 07-07-02
Attention!
Repairs are not permitted!
© 36295-2
Checking the easy action of the nozzle
needle
z Switch off the tester’s pressure gauge.
z Carry out chatter and jet test of the nozzle needle.
The easy action of the nozzle needle in the
nozzle body is checked by the acoustic
chatter test.
Increasing wear in the needle seat of the
fuel injectors changes the chatter behavior
of the injecton nozzle.
A used fuel injector must buzz audibly and
atomize the fuel finely when the lever is
actuated quickly.
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z If the injection nozzle does not buzz audibly, it must
be dismantled and cleaned.
 W 07-07-02
The injection nozzle must be changed if it
does not buzz after cleaning.
The jet profile may deviate considerably
from that of a new fuel injector.
© 36296-2