4-2
Bleeding (or priming)
If
air should
get
in fuel system, injection
will
go
wrong, keeping the engine from
steady running or making
it
difficult
to
start. So, whenever any servicing done
with
this
system, bleed (or prime)
it
in the
following
procedure.
1)
Loosen bleeding plug on fuel
filter
and
move hand pump on fuel feed pump up
and down.
As fuel
filter
is
fed
full
with
fuel, air bubbles will run
out
with
fuel through
bleeding plug.
When
the
outflow
of
fuel does
not
contain air bubbles any
longer, screw bleeding plug tight.
2)
Loosen bleeding plug on the
top
of
injection pump,
and
move hand pump
like-wise up
and
down
to
eliminate air
out
of
fuel pump in it.
3)
With nozzle-side cap nuts
~n
injection pipes loosened
and
stop lever in
"full-open"
position, run run the engine
scores
of
revolutions by -starting
motor,
and
all four injection pipes will
be
bled
of
air
at
a time.
The bleeding must
be
done, too, when the engine
has
been
left
idle
for
a long
time, fuel pipes replaced,
or
nozzled checked.
Fig.3-16
Joint
on
fuel inlet
in
fuel feed
pump
Fig. 3-17 Bleeding fuel injection pump
4-3 Checkup
of
nozzles
When
something unusual notices
with
exhaust
gas
or
firing, check nozzles
and
service
accordingly.
Regular checking
and
servicing
of
them at intervals
of
500Hr
of
run
will
keep
them
always in perfect conditions.
For
new engine, check them when
it
has
been
run
for
250Hr. Their checkup
and
serviCing
should preferably
be
entrusted
to
your
dealer
or
a
xervice shop.
1)
Nozzles
are
checked by
means
of
a nozzle tester. Set nozzle on the tester
and
slowly
pressing
its hand lever,
see
how
it
will
eject fuel.
It
must !flake
-
24-
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