Installation Nozzle; Note For Cleaning Nozzle; Checking The Injection Timing - Doosan DP158LCF Operation & Maintenance Manual

Installation nozzle

1. Clean seat in cylinder head.
2. Insert nozzle holder with new gasket.
3. Tighten union nut with 12 kgf•m.
Torque
4. Install injection lines free of constraint. Install leak fuel
lines, screw delivery pipe at nozzle holder and at the
injection pump.
CAUTION
• The injection lines are designed for high oper-
ating 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 pres-
sures, not only the failed part but also the injec-
tion line has to be replaced.

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. 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 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, prefer-
ably 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
• Hold the needle at the pintle end only ; to avoid corro-
• Thoroughly clean all other parts of the nozzle holder
12kgf·m
• Check nozzle discharge pressure in nozzle tester. The

Checking the injection timing

1. Remove the plug screw on the flywheel housing
Note) Some cases are needed to remove cover
2. Turn the crank pulley so that the mark on pointer
59
4. Regular inspection
needle in clean test oil.
sion do not touch the lapped surfaces of the needle
with you fingers.
with clean fuel.
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.
cover.
assembly.
provided on injection pump coincides with matching
mark(FB) on the flange surface of the drive gear.
FB
Pointer
Flange
DV2213164A_K