Fig.3-18 Testing nozzle
Fig.3-19
Main
injection from nozzle
intermittent injection
in
fine spray with sharp hisses. Spray must
not
split
at
the end, nor
go
astray, nor dribble.
2)
See also
at
what pressure it
will
start injection. It must
be
within a range of
120±5kg/cm
2
•
Any discrepancy
is
corrected
by
changing the total thickness
of
shims on nozzle spring with nozzle nut off. For the calculation
of
how much
shims must
be
added or removed, remember
that
0.1
mm
of thickness
corresponds
to
approx. 10kg/cm
2
of injection pressure.
3)
Main
injection
that
takes
place when hand lever
is
pressed hard must form a
straight cone of about
40°
in
spray angle
that
contains no large fuel
particles, and. must break
clean off without leaving
any drop of fuel around
Fig.
3-20 Nozzle spring shim
injection orifice.
In
handling nozzles, follow the instructions
given
below.
1)
Each time
to
remove nozz·les,clean off dust from around them
in
advance, lest
it should on packings on their tips.
2)
In
leaving nozzles off,
put
caps on their inlets
to
keep off dust.
3)
Never
change the combination of needle
valve
and
valve
se.at.
This must be
remembered particularly
in
removing nozzle tip from nozzle holder for
replacement.
4)
If
nozzles stained with carbon and sludge, scrape them off with a piece of
wood or
such·like soft material. Never pick injection orifices with a wire, etc.
-
25-
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