5.3.1. 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. (EI.03004-0225)
•
Remove nozzle holder with gasket
from the cylinder head.
Note for cleaning nozzles
•
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 damaged 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 nozzles by chucking a cleaning needle of suitable diameter in the
collect. If the carbon deposits in the spray holes cannot be removed by rotating and
pressing, have the needle project only slightly from the collect and drive out the carbon by
lightly tapping on the tool.
•
Before reassembly thoroughly wash nozzle body and needle in clean test oil.
•
Hold the needle at the pintle end only ; to avoid corrosion, do not touch the lapped surfaces
of the needle with you fingers.
•
Thoroughly clean all other parts of the nozzle holder with clean fuel.
•
Check nozzle discharge pressure in nozzle tester.
The edge-type filter should not be pressed into the nozzle holder by more than about
5mrn. If this depth is exceeded the injector must be replaced.
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