f)
Oil
pump worn down.
g)
Relief valve covered with dirt.
4. FUEL SYSTEM
As
can be seen
in
the above diagram, fuel
is,
from fuel tank, pumped up by fuel feed
pump through piping,
by
which
it
is
discharged into fuel filter where it
is
filtered clean;
thence
is
runs into fuel injection pump
to
be
ejected, under control of injection rate
according
to
the load and under high pressure, into combustion chambers via injection pipes
and nozzles. For
stop~ing
and cold starting, control of injection rate can
be
done with stop
lever
but
in other cases, should be left
to
pneumatic governor
that
works by Venturi negative
pressure.
Fuel injection
Pump
BiNding
plug
Fuel
fHd
pump
__
Fuel injection pipe
7?:;?;:~r;=;;=f=;~F==~
,~,t',F"'1
injection nozzle
FUE~RETURN
BiNding
plug
Fuel filter
~
n t
i )':1
-"1
'-"-".:
\:
LJ
L
___
.-J
Fig.
3·14
Fuel
system diagram
4·1 Fuel filter
Overflow pipe
1)
Every 120Hr of run, screw
off
bleeding and drain plugs
to
drain off
dirt
and
water settled
at
its bottom; then screw
in
drain plug and make a bleeding (or
priming).
2)
Fuel filter element
is
of paper. When it gets clogged with dirt, fuel feed makes a
drop.
Replace it with a new element every
l,OOOHr
of run.
To
wash it
in
-
22-
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