Advertisement
(99)
ENGINE FUEL AND EXHAUST SYSTEMS
FUEL AND VACUUM PUMP
3-25
Figure 3-31-Vacuum Diaphragm Flexing Tool in Place
8. Place spring retainer over the riveted end
of diaphragm pull rod
,
place diaphragm spring
on the retainer, then place vacuum cover over
the spring. Make sure that retainer stays down
in place against the diaphragm protector.
9. Line up the file marks on vacuum
cover
and pump body, then install two long screws
(10-32 x 1%") in opposite holes. Alternately
turn screws down until the regular cover screws
and lockwashers can be installed, but do not
tighten these screws. Remove long screws and
install short ones. Be sure that screws pass
through holes in
fabric
of diaphragm
without
chewing.
10. Remove the flexing tool. The pressure of
the vacuum spring will then flex the diaphragm
the correct amount.
11. Tighten all cover screws alternately on
diametrically opposite
sides,
turning each sev-
eral turns at a time, until all are securely
tightened.
f.
Testing Repaired Fuel and Vacuum Pump
Bench tests of the fuel and vacuum sections
of the pump require equipment which is not
available in service stations; therefore, tests
must be made after installation of pump assem-
bly on an
engine.
Test fuel section of pump as
described in paragraph 3-17. Test vacuum sec-
tion of pump as described in paragraph 3-18.
Advertisement
