Man D 2866 E, Руководство по эксплуатации, Страница: 35 / 64

Maintenance and care
33
Injector maintenance
(by authorized specialist personnel)
1
2
3
4
5
6
7
8
9
1 Nozzle holder
2 Union screw
3 Washer
4 Compression spring
5 Thrust pin
6 Intermediate disc
7 Injection nozzle
8 Nozzle nut
9 Gasket
The injectors are designed to spray the
fuel delivered by the injection pump di-
rectly into the spherical combustion
chamber in the piston crown.
The injector consists of the nozzle and the
nozzle holder.
A copper gasket fitted to the injector en-
sures gas-tight seating and good heat dis-
sipation.
The opening pressure of the nozzle is ad-
justed by means of shims at the compres-
sion spring.
Removal, dismantling and cleaning
Unscrew delivery pipe at nozzle holder
and at the injection pump.
Remove leak-off pipe.
Release union screw of nozzle holder with
special wrench.
Remove nozzle holder with gasket from
the cylinder head.
Note for cleaning nozzles with Bosch
cleaning set KDEP 2900
Clean nozzle body externally from soot
and carbon. When cleaning several
nozzles at the same time, make sure
nozzle bodies and needles are not mixed
up. Visually inspect needle and body.
Cleaning is useless if the seat of the
needle is indented or the pintle is dam-
aged and the nozzle should be replaced.
Clean annular groove with scraper over
full circumference. Wash out dislodged
carbon deposits and dirt.
Scrape needle seat with cleaning cutter.
Dip cutter in test oil before use. The cutter
can also be clamped in a lathe.
Polish needle seat with wooden cleaning
tool, preferably by chucking the needle in
a lathe at the pintle end.
Clean the spray holes of hole nozzles
using the cleaner KDEP 2900/2 by chuck-
ing a cleaning needle of suitable diameter
in the collet. If the carbon deposits in the
spray holes cannot be removed by rotat-
ing and pressing, have the needle project
only slightly from the collet and drive out
the carbon by lightly tapping on the tool.