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3-24
FUEL AND VACUUM PUMP
ENGINE FUEL AND EXHAUST SYSTEMS
(98)
Figure 3-29-Valves and Retainer Installed in Fuel Cover
another valve in other seat with spider facing
up. Place retainer over valves with humped
side up and install retainer screw. See
fig-
ure 3-29.
10. Install gasoline screen, bowl gasket and
bowl in the order named, then install bowl
screw and gasket and tighten screw securely.
11. A diaphragm gasket (not used in factory
assembly) is included in each repair parts
kit.
Its purpose is to compensate for slight warpage
of the fuel cover flange that may occur in
service. Place this gasket on the fuel diaphragm
and align all screw holes in gasket, diaphragm,
and pump body.
NOTE: Hol
es
may be kept in alignment and
possible distortion of diaphragm may be avoided
by making two
guide
pins with
short 10-32
threads and
temporarily
in
stalling these
in op-
posite
screw holes in body flange.
12. Place fuel cover in position so that file
marks on cover
a
nd
pu
mp body are in line,
maintain pressure on rocker arm so that dia-
phragm is flat across body
flange,
t
hen
install
all cover screws and
lockwas hers
until screws
just engage lockwashers. Be sure that screws
pass through holes in fabric of diaphragm with-
out chewing.
13. Pump rocker arm two or
t
hr ee full
strokes
to make sure that diaphragm is not
stretched too
tight, then hold arm to fully compress the dia-
phragm spring while tightening cover screws.
Tighten screws alternately on diametrically op-
posite sides until all are tight before releasing
the rocker arm.
CAUTION: Diaphragm must be held in flexed
position
until all screws are tightened, other-
wise diaphragm may be stretched too tight and
cause pump to deliver excessive pressure.
e
.
Installation of Vacuum Diaphragm
a
nd
Valves
1. Soak new vacuum diaphragm in clean
kerosene while performing the following
steps.
Fuel oil or gasoline may be used.
•
Figure 3-30-Valves and Retainer Installed in Vacuum Cover
2. Place one gasket in each valve seat in vac-
uum cover. Place one valve in seat adjacent to
outlet port with the three legged spider down.
Place another valve in other seat with spider
facing up. Place retainer over valves with
humped side up and install retainer screw. See
figure 3-30.
3. Turn cover over, and set screen in recess
over valve hole. Set screen retainer on screen.
Place cover plate gasket, cover plate, screw
gasket, and cover plate screw in position in the
order
named.
Tighten cover
screw.
4. Install oil seal parts on vacuum diaphragm
pull rod in the following order: spring, re-
tainer, oil seal, and retainer. Turn outer re-
tainer to lock parts on pull rod.
5. Hold pump with fuel side up so that vac-
uum links will drop into position for attaching
vacuum diaphragm pull rod. Insert diaphragm
pull rod through opening in pump body ana
hook it to the two long vacuum links.
6. Hold
vacuum
diaphragm in place while
clamping pump body mounting flange in a vise,
with diaphragm up.
7. Depress rocker arm and insert hooked end
of Diaphragm Flexing Tool KMO-613 between
rocker arm and the stop cast in pump body,
then release rocker arm. The vacuum diaphragm
will be held in a flat or level position. See figure
3-31.
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