6-3-4
FUEL
PASSAGE
From the plunger pump fuel is sent
through the high pressure pipe
1
to the
fuel passage
2.
Then, at the nozzle body
3,
it is pressurized up till
195
kg/c
m’
and
it
lifts up the needle valve
4
for
0.18
mm,
and is injected into the combustion
chamber via the jet hole
5.
An excess fuel which lubricated the inside
of the nozzle and nozzle holder returns
to the fuel tank via the needle valve-,
nozzle spring
6
-overflow pipe
7
+-fuel
tank. (See Fig.
7
1
.>
a
7
3
4
5
FIG.
71
6-
3-
5
INSPECTION
AND
MAINTENANCE
Fuel injecting condition of the nozzle and the valve opening pressure are quite influential
to the engine operation, insufficient output, increase
of
noise and exhaust smoke. Use of
improper fuel
or
contaminated fuel is one of the main causes of the nozzle trouble.
Therefore, exert good care for using good fuel.
As
the nozzle is assembled from very
precisely finished parts, utmost care and attention must
be
paid when inspecting and
checking.
(1
)
INSPECTION
After cleaning nozzle holder outside, inspect
in the following steps
:
a) Visual inspection
Whether
or
not injection hole
is
damaged, or clogged with carbon.
Whether
or
not injection hole is clogged
with dust and carbon.
b) Checking by nozzle tester
Fit the nozzle assy to the nozzle tester.
When removing
the
nozzle
~~QPVI
the
engine
or
fitting, it to tester, be sure
to
.keep
the
nozzle
free
of
dust.
FIG.
72
Move the lever
of
the nozzle tester up
and down for
2-3
times and
suck
the
air inside the nozzle.
Newer bring
your
face
near
the injected
fuel mist
from
the
nozzle.
Also
keep
away
your
hands
from the mist.
-
45
-
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