pump is pressure regulated automatically type. When the pressure
of
the
low
pres-
sure fuel pipe higher more than the stipulated value, the higher pressure will press
the backup spring through the piston and force the piston away
from
the push rod
gradually,
this
can
reduce
the
amount
of
the
delivered
fuel
or
stop
delivering.
Inverse-
Iy,
will add or continue delivering.
The hand press
is
used
to
make the fuel deliver pipe full
of
fuel and
to
wipe
off
oir
before the engine starts.
When
the engine is not at working situation,the handle nut
should be tightened.
8. 2 Fuel filter
In
order
to
meet
different requirements, there are three types
of
fuel filter:
CS0708BI ,
CS0712Bl,
COS10S, the former
two
are single stage
type,
C0810S is
double stages type.
The purpose
of
the fuel filter is
to
filter
the
tiny impurity
out
of
fuel
to
reduce the
wear
of
the precise mates inside the hing pressure
and
injector.
After
the fuel being fitered
with
element,dirt
is kept on
the
element outer surface.
Being made
of
fuel filter paper,the
e~ement
should be maintained and replaced regu-
larly. For the fuel filter
with
water
deposited
cup,
the
water
in
the
cup should be
drained
off
regularly.
8. 3 Fuel injection pump
There is type
A
of
high - pressure
pumps:
The body
of
the type A
pump
is an all - in
- one - piece
style,
as shown
in
Fig. 7.
The quantity
of
fuel delivered
for
the fuel pump varies according
to
the load
of
the
diesel engine. This is achieved by the rotating of plunger made by
the
shaft rotating
movement
of
the adjusting rod gear. The injected fuel rate can be changed
byadjus-
ting the cam working section and the diameter
of
the plunger
so
as
to
meet
the dif-
ferent requirement
of
the diesel engine characteristics. The front
of
the
fuel pump is
fixed on the gear housing by the fuel pump fixing flange. When installing, please
match well
with
the gear so as
to
ensure the fuel delivery advance angle correct.
The adjusting method
of
the fuel delivery advance angle is
to
discharge the fuel
pump on the gear housing cover and check the cover
timely;
loosen the platen
screw
fixed on
the
fuel pump gear
hub;
turn the hex head bolt on
the
end
of
the fuel
pump bearing; turning clockwise will add the fuel delivery advance angle while turn-
ing
anticlockwise
will
reduce
the
fuel
delivery
advance
angle.
After
adjusting proper-
Iy, fasten the four platen
screw
and the six hex head bolt on
the
and
of
the fuel
pump bearing
to
avoid
them
loosening.
• 36 •
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