FUEL
SYSTEM
SERVICE
2. Install the tie-rod cover.
In
the case
of
a damper spring-
loaded cover, install the cover with the tie-rod pressed
toward the High
Speed side by the speed control lever (see
illustration).
TIE·ROD
SPRING
GASKET
LOCKNUT
ADJUSTING
BOLT
tf:bAlING
CAP
TIE·ROD
COVER
INSTALLlN~
TIE·ROD
COVER
3. Connect the fuel supply hose. Preheat
to
bleed air from the
system.
4. Check damper spring adjustment and fuel injection timing.
For these adjustment procedures, refer to
ENGINE
ADJUSTMENTS.
Injector
A
CAUTION:
Thoroughly
clean
all
parts
with
kerosene.
00 not
wipe
them
with
rags.
When
tightening
the
retaining
nut
on
the
nozzle
holder
body,
be
sure
to
tighten
it
to
the
specified
torque.
Insufficient
torquing
will
cause
poor
compression.
Excessive
torquing
will
prevent
the
nozzle
needle
from
moving
freely.
1. Install the nozzle assembly, distance piece, and pressure
pin in the retaining nut.
2. Install the shim, spring and flange to the body. Install the
retaining nut on the body and tighten to the specified
torque.
A
CAUTION:
When
using
a
vice
to
tighten
the
nut,
be
sure
to
hold
the
body
side.
If
the
retaining
nut
was
held,
a
defonned
nozzle
would
result.
Adjustment
and
Installation
of
Nozzle
Holder
Assembly
1.
Injection Start Pressure
Test.
Using a nozzle tester, mea-
sure the injection start pressure.
If
the pressure is differ-
ent from the standard value, adjust to the specified
pressure by increasing or decreasing the thickness
of
the
adjusting shim. Increasing or decreasing shim thickness
by
0.1
mm will vary the pressure by approximately 10
kg/cm:!,
When replacing the shim, grip the retaining nut
in a vise and remove the body with a wrench. TIghten the
retaining nut to the specified torque.
INJECTION
PRESSURE
TEST
!
SHIM-
THICKNESS
~
"",,,,,,,,,,,-,
~
'"
'-',""-
I
0.1
mm
0.2mm
O.3mm
O.5mm
2.
Chattering
Test.
For the chattering test, operate the tester
lever slowly. If the nozzle sprays sharply and intermit-
tently, the nozzle is considered good. The nozzle should
spray fuel straight in its axial direction. A nozzle is defec-
tive
if
it sprays fuel
in
a wrong direction
or
in several
separate strips. Also a spray in the form
of
particles indi-
cates a defect. These defects may sometimes be caused
by clogging with dust, therefore all parts should be care-
fully cleaned before assembly.
GOOD
BAD
BAD
Engines & Generators
42
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