After
every 250 hours
of
work, clean the
first
fuel
filter
(Item
a,
Fig. A.IV/4), as follows:
1.
Back
out
the screw (Item
2,
Fig. A.IV/4).
2.
Replace filtering element (Item
5)
and sealing
rings (Items 4 and
8).
If,
with
a new cartridge, a problem persists,
replace the element
of
the second
filter
also.
Bleed air
after
each service operation performed
on
filters
to
permit starting the engine.
BLEEDING THE FUEL SYSTEM:
Proceed as follows (Fig. A.IV/5).
When air is allowed
to
enter the fuel
system
by
the
fuel tank running dry, the fuel
filter
is
drained
or
changed,
or
through a loose fuel fine connec·
tion,
then the fuel system
must
be
"bled."
To
"bleed"
the fuel system, proceed as follows:
1.
Open
the
fuel shut-off valve at the tank and
loosen the air vent plug (Item 1
1) on the
primary fuel filter. Operate the hand lever
(Item
16)
on the fuel pump, making full
strokes, until fuel flows free
of
air.
If
the cam that operates the fuel
pump
is
on
the
high
spot, the hand lever
cannot
be
operated.
To
correct
this,
rotate
the
crankshaft one-half revolution. Retighten
vent plug.
2.
Loosen the air vent plug on
top
of
secondary
fuel
filter
(Item
15),
pump fuel pump
until
fuel
flows free
of
air and then
tighten
vent plug.
3.
Loosen the lower vent plug (Item 8) on the in·
jection pump and operate the fuel
pump
lever
until
the fuel
flows
free
of
air. Tighten the
vent plug.
Loosen the upper vent plug (Item
13)
on the
injection
pump
two
full turns only.
4.
Loosen the
injector
connections
(Item
14)
at
the injectors. Crank the engine
with
the
15164
FIG. A.IV/4 FUEL FILTERS
a.
First fuel filter; b. Second fuel filter;
1.
Vent;
2.
Control screw;
3.
Cover with fuel inlet and
outlet
valves;
4.
Rubber seal;
5.
Filtering ele·
ment;
6.
Rod;
7.
Sediment bowl and rod;
8.
Seal;
9.
Transparent bowl; 10. Bowl
(9)
attaching screw
starter
motor
until
the fuel is free
of
air
at all
~1.:.:5:.:.16:.:5;_
______________
__
connections.
The fuel shut-off knob
must
be pushed in
for
fuel
to
flow
to
the injectors.
5.
Tighten the
injector
connectors
(Item
14).
Let
upper vent plug remain open
two
turns.
Crank
the
engine
with
the
starter
motor
until
it
starts. As soon as fuel
coming
from the up-
per vent plug is free
of
air,
tighten
the
plug.
Avoid overheating the starter motor.
Allow
it
to
cool 2
minutes
for
every 30 seconds
it
is
cranked.
FIG. A.IV/5 BLEEDING THE FUEL SYSTEM
11. Bleed plug on first fuel filter; 12. Injection
pump damper; 13. Vent screw for the pump fuel
return
circuit;
14. Pressure line fittings; 15. Bleed
plug on second fuel filter; 16. Fuel pump hand
primer
Engine·
31
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