Man D 2840 LE 301, Repair Manual

Page: 37 / 194

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Checking and repairing fuel injectors
35
Fig. 7
Dip nozzle body and nozzle needle separately into
filtered Diesel fuel and check their gliding quality.
When pulled out of the nozzle body by up to a third
of its length the nozzle needle must sink back to its
seat under its own weight when released.
Place injection nozzle on top, ensuring that the
associated pins are correctly fitted.
Fig. 8
Screw on union nut, tightening it to the specified
torque (see “Service Data”).
Check injector on the manual test stand.
Ensure that the edge-type filter is correctly
seated in the injector body.
Fig. 9
A dislocated sieve bar filter throttles and prolongs
the injection and consequently causes poor perfor-
mance, high consumption and heavy smoke
formation in conjunction with heavy engine vibra-
tions.
For this reason measure the rim offset of the sieve
bar filter in the nozzle inlet.
The sieve bar filter must not be pressed into the
nozzle holder farther than approx 5 mm.
In the event of larger rim offsets, the nozzle holder
is to be replaced.
1