Doosan DP158L Series, Руководство по эксплуатации и техническому обслуживанию

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4. Regular inspection
57
Installation nozzle
1. Clean seat in cylinder head.
2. Insert nozzle holder with new gasket.
3. Tighten union nut.
4. Install injection lines free of constraint. Install leak fuel
lines, screw delivery pipe at nozzle holder and at the
injection pump.
Note for cleaning nozzle
• 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. Visu-
ally 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 circumfer-
ence. 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 5mm. If this depth is exceeded
the injector must be replaced.
Checking the injection timing
1. Remove the plug screw on the flywheel housing cover.
Note) Some cases are needed to remove cover assembly.
2. Turn the crank pulley so that the mark on pointer
provided on injection pump coincides with matching
mark(FB) on the flange surface of the drive gear.
DV2213164A_K
3. Check the injection timing degree whether the V-type
edge of the flywheel housing sight hole coincides with the
engine injection timing degree marked on the flywheel
corresponding to fuel delivery position.
DV2213165A_K
Torque
7kgf
·
m
CAUTION
• The injection lines are designed for high operating
pressure and should thus be handled with particular
core.
• When mounting the pipes to the engine take care of
good fitness.
• Do not bend pipes to permanent deformation. (not
for replacing the nozzles either)
• Do not mount any heavily bent pipes.
• Avoid bending the pipes at the ends by more than 2
to 3 degrees.
• In case of faults in the injection system which might
have resulted in excessive operating pressures, not
only the failed part but also the injection line has to
be replaced.
FB
Flange
Pointer