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(c)
Take out the nozzle from the retaining nut.
If the nozzle
is too hard to remove, lightly tap i t- wi th a wooden piece
and remove, taking care not to damage the needle valve.
Inspection
Check the nozzle for incorrect contact and damage, and if defective,
replace the nozzle assembly.
Check the pressure spring for damage.
Assembly of Nozzle and Injector Assembly
CAUTION:
Before assembling,
put
the parts
in diesel oil and
clean them well.
DO NOT wipe the cleaned parts with cloth.
When installing the nozzle holder body and retaining nut, be sure
to
tighten them to the specified torque.
Inusfficient torque
will cause poor compression.
If torqued excessively, the nozzle
needle will drag, affecting injection performance.
(1)
Install
the
nozzle
assembly,
spacer
and
pressure
pin
to
the
retaining nut.
(2)
Install the shim, spring and flange in the body and install them
to the above-mentioned retaining nut and torque the retaining nut
to the specification.
(3)
Tighten the nipple gasket and nipple.
Injection Test
(1)
Injection Start Pressure Test
(a)
Measure
the
injection
start pressure using a
nozzle
tester,
and
if
out
of
standard,
make
adjustment
to
obtain
the specified pressure
by increasing or
decreasing the
adjusting shims.
Adding shims
increases
the pressure and
reducing shims
decreases the pressure.
(b)
As the thickness of the
adjusting shim changes
0.1 mm, the pressure changes about 10 kg/cm 2 •
To change the
shim, hold the retaining nut with a vice and remove the pump
body with a wrench.
Tighten the retaining nut to the spe-
cified torque.
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