@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 standard
value, the nozzle
is
in a
good
condition.
@Push further and check whether or not
the fuel mist
is
injected straight.
NOZZLE
Good
injection
is
straight forward.
Just after injection, check “after
dripping.”
(2)
MAINTENANCE
If
the test results are found not good (poor
injection and “after dripping”), carefully
check and repair in the following
procedure
:
a) Disassemble the nozzle holder and nozzle,
and wash in clean light oil.
When washing, use
a
wooden chip
(for instance, wooden toothpick
is
serviceable.) for peeling off the carbon
adhered to the nozzle.
b)
After washing, pull out the needle
halfway
from
the body of nozzle with
your fingers and then let it
go.
And
check
if
the needle
sinks
by
its
own
dead weight.
c)
If
it
does not sink, replace
it
in
the
form of a set.
d) Frinction surfaces of both the needle and
sure to keep the parts free of dust.
FIG.
73
NEEDLE
.
BODY
FIG.
74
nozzle body are ultra precise finish.
So,
be
e>
If
“after dripping“
is
found,
it
is
poor
contact between the needle valve
and
the seat.
In
such a case, it
is
advisable
to
replace
it
in the form of a set, needle valve and nozzle
body. However, it
is
possible
to
coat chrome oxide
on
the tapered surface of the needle
and get a good contact. Wash very carefully after correction.
f>
The spacer
is
an important part to set positions of the nozzle holder
and
the nozzle
body. Pay attention
to
the position of the pin.
g)
When fitting the nozzle body to the nozzle holder, conform
to
the specified tightening
toruqe.
Tightening torque
:
300-400
kg-
cm
h)
Recheck with the nozzle tester. If the adjustment of valve opening pressure
is
necessary, adjust it to
200-210
kg/c
m‘.
,
The valve opening pressure shall decrease to
195
kg/c
mz
after the running in.
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46
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