Chevrolet 10 Series 1970 Service Manual page 382

ENGINE FUEL 6M -18
F i g . 8 p — H o o k in g V a c u u m
other hand in sert the vacuum diaphragm pull rod
through o il seal. Have flat o f pull rod p a ra lle l to
vacuum links.
P u ll Rod to V a c u u m L in k
CA U TIO N :
Be ex tre m ely ca refu l when in s e rt­
ing diaphragm push rod through seal to avoid
damaging seal.
L e t up slightly on pump and turn diaphragm 90° so
that pull rod ro lls onto link (fig„ 8P).
L ift diaphragm cloth and position va lve and cage in
re c e s s close to mounting flange. No gasket is r e ­
quired because the diaphragm seals the va lve cage.
B efo re installing vacuum co v er, ro ck er arm must be
positioned so that vacuum diaphragm w ill be held
le v e l with the body flange while the vacuum co v er is
in stalled. This can be done by inserting a 3/32 inch
piece of m etal between rock er arm stop and body.
This tool can be made fro m a p iece of steel 3/16" x
3/32" x 6". Bend one end to fo rm a righ t angle 3/8"
fro m bend to end.
26. P la ce spring reta in er on riveted end of diaphragm
pull rod and place the diaphragm spring on the r e ­
tainer. P la ce vacuum co v e r o v e r spring and align
holes.
27. P re s s vacuum c o v er fir m ly down against diaphragm
and body flange and in sta ll two screw s d ia m etric a lly
opposite. (T w o 10-32NF x 1-1/2" screw s may be
installed to pull vacuum co v e r down.)
maining vacuum c o v e r
screw s just engage lockw ashers.
28. R elease ro ck er arm to allow heavy vacuum spring to
push diaphragm to flexin g stop in body.
c o ver screw s secu rely.
Install r e ­
screw s and tighten until
Tighten a ll
CHEVROLET TRUCK SERVICE MANUAL