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ENGINE FUEL AND EXHAUST SYSTEMS
FUEL AND VACUUM PUMP
3-23
flanges. Examine all screw holes for stripped
or crossed threads. Replacement of the pump
assembly is advisable if one of the three main
castings is not serviceable.
3.
Inspect rocker arm for wear or scores at
camshaft
pad,
at point of contact with links,
and at pivot
hole.
4.
Inspect screws and replace if damaged or
obstructed. Screws must fit snugly into recesses
around all edges.
5. Replace links if pump has been in service
for high mileage. Amount of wear cannot be
determined
visually.
6. Replace diaphragm in faulty section of
pump,
or both diaphragms if service mileage is
high.
7. Replace valve and cage assemblies as these
parts cannot be visually checked for wear.
8. Replace rocker arm and diaphragm
springs, as removed, because old springs may
be distorted or
corroded.
9. Replace rocker arm pin and washer if
removed, as these cannot be used again.
10. Always replace
all gaskets removed, to
insure tight seals.
d. Installation of Fuel Diaphragm
and Valves
Always in
stall
th
e
fu
el
diaphragm
before
the
vacuum
diaphragm.
1.
Soak new fuel diaphragm in clean kero-
sene while performing the following
steps.
Fuel
oil or gasoline may be used
.
2. Insert drilled end of fuel link (short) into
link
spacer.
Place one vacuum link (long) on
each side of spacer so that the hooked ends
of long links come together. The hooked ends
of all links and the projection on link spacer
must point as shown in figure
3-27.
FUel
UNK~
-----1J1
;:~~
-
--
-LINK
SPAC
ER
Figure
3-27-Links,
Spacer,
Rocker Arm, and Bushing Assembled
3. Line up holes in links and spacer, slide
parts between the jaws of rocker arm with
flat surface of rocker arm pad facing in same
direction as link hooks, then install the pin
bushing. See figure 3-27.
4.
Check clearance of links and spacer in
rocker arm.
If
required, place spacer washer
between rocker arm and one or both vacuum
links to take up clearance while allowing free
movements
of links in rocker arm.
5. Stand the pump body on the bench, fuel
flange down. Set rocker arm spring in body
with one end over cone cast into body. Slide
rocker arm and link assembly into body, with
open end of all link hooks pointing up toward
vacuum flange, and engage rocker arm spring
with projection on link spacer. Hold parts in
body with the small end of Rocker Arm Dummy
Pin KMO-707 (or a piece of
%2"
drill rod). See
figure 3-28.
-
DUMMY PIN
~
Figure 3-28-Rocker Arm and Links Held in Body by Dummy Pin
6. Turn the pump body over so the fuel
diaphragm flange is up
.
Set the diaphragm
spring on the staked-in oil seal, and the retainer
on top of the
spring.
Push diaphragm pull rod
through retainer, spring and oil seal. Flat of
pull rod must be at right angles to link. Hook
diaphragm pull rod to the short center fuel
link. CAUTION: Do not
tilt
diaphragm pull
rod excessively as this may damage the oil seal.
7.
Push Dummy Pin through body so that
large diameter aligns the holes in all
parts,
then
drive
the pin out
with t
he
new
permanent
r
ocker
arm pin.
8. Support head of
rocker arm pin on a suit-
able steel block, place washer over small end
of pin so it lies flat against body, then spread
or "mushroom" end of pin with a ball peen
hammer.
9. Place one gasket in each valve seat in fuel
cover. Place one valve in seat nearest the outlet
port with the three legged spider down. Place
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