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5.
Fuel
passage
From the plunger pump fuel is sent through the highpres-
sure pipe
1
to the fuel passage
2.
Then, at the nozzle body
3,
it is pressurized up till 195 kg/cm2 and it lifts up the needle
valve
4
for
0.18
mm, and is sprayed 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.
63
.)
6.
Inspection and maintenance
1
2
7
6
3
4
5
Fig.
63
Fuel spraying condition
of
the nozzle and the state of pressure at starting injection are quite influential to the engine mal-
function, insufficient output, increase
of
noise and exhaust smoke. Use
of
improper fuel and contaminated fuel is one of the
main courses of the nozzle trouble. Therefore, exert good care for managment
of
fuel.
As
the nozzle is one of the very pre-
cisely processed parts, utmost care and attention must be paid when inspecting and checking.
1)
Inspection
After cleaning nozzle holder outside, inspect
in
the be-
low sequence.
a) Visual inspection
*Whether or not injection hole is damaged, or clog-
ged with carbon.
*Whether or not injection hole is clogged with dust
and carbon.
b)
Inspection by nozzle tester
*Fit the nozzle holder to the nozzle tester.
CAUTION: When removing the nozzle from
the
engine or fitting
it
to the tester, be sure
to
keep
the nozzle free of dust.
*Move the lever of the nozzle up and down for
2
-
3
times and suck the air inside the hozzle.
CAUTION: Never bring your face near the pres-
surized
fog
from the
nozzle.
Also
keep away your
hands from the fog.
*Gently push down the lever of the nozzle tester
and read the pressure gauge just before the fuel
being injected. If the figure coincides with the stan-
dard value, the nozzle is in a good condition,
*Push
further and check whether or not the fuel fog
is injected straight.
CAUTION: Good injection
is
straight forward.
Fig.
64
NOZZLE
Just
after
injection, check "after dripping."
Fig.
65
-
34
-