Service manual
Table Of Contents
5. Injection nozzles
The injection nozzle provides a means
of
spraying ®--_"-
into the precombustion chamber the fuel oil delivered
under pressure from the injection pump.
It
sprays oil
out
in
a conical pattern consisting
of
finely atomized drop- ®
lets
of
oil. The mating surfaces
of
the nozzle holder
body, distance piece and nozzle are precision.finished
to
form an oil·tightness.
The injection pressure adjustment may be made by
means
of
adjusting washer. Increasing the thickness
of
the washer will increase the spring tension and, hence,
the injection pressure, and vice versa.
5-1
Removal
(1) Remove injection pipe connecto
rs
(1)
to
disconnect
injection pipes (2).
(2) Disconnect leak-off pipe (3) (4) connecting nozzles
by loosening nuts (5).
(3)
Using a wrench, remove nozzles from cylinder
head
as
shown. Also remove nozzle packings with a
wire or screw driver. Replace a defective packing,
if any.
(4) Install injection nozzles in the reverse order
of
removal. Tighten nozzle holders
to
a torque
of
5
kg-m
(36.2Ib-ft).
[NOTE)
Cover the injection pipe and cylinder head
openings
to
prevent entry
of
dust or foreign
matter after removing the nozzles.
5-2 Disassembly
(1) Before disassembling injection nozzles, check
the nozzle
injection beginning pressure, the spray
pat-
tern and adjust
if
necessary. Carry
out
oil-tightness
test and repair
if
necessary.
Exercise care
not
to damage the points
of
needle
valves during disassembly, washing and assembly of
nozzles.
(2) Hold retaining nut (1) in a vice and loosen nozzle
holder (2) with a wrench.
-60-
CD
,-Retaining
nut
2·Nozzle
tip
3·Distance piece
4-Pressure pin
5-Pressure spring
6-Washer
7-Nozzle
holder
8-Gasket
9-Nut