Pontiac tempest 1968 Service Manual page 328

E N G I N E FUEL
6B-21
Fig. 6 B - 4 7 Flange—Bowl Passage Identification
e. Inspect fast idle cam. If wear is noted on
steps of cam, it should be replaced as it may upset
engine idle speed during the warm-up period.
f. Inspect pump plunger cup. Replace plunger
if cup is damaged.
g. Inspect power piston and spring for burrs or
distortion. Replace if necessary.
4 . Check all filter screens for dirt or lint. Clean
and, if they are distorted or plugged, replace with
new parts.
-IDLE NEEDLE HOLES"
POWER PISTON
VACUUM
• h i
CHOKE VACUUM
IDLE DISCHARGE SLOTS
Fig. 6B-48 Throttle Flange Passage Identification
Fig. 6B-49 Body to Cluster Passage Identification
5. Inspect cluster casting. If any parts in castings
are loose or damaged, cluster assembly must be
replaced.
6. Use new gaskets in reassembly.
ASSEMBLY OF THROTTLE BODY
1. Install idle screw in throttle lever if removed,
2. Screw idle mixture adjusting needles and
springs into throttle body until finger tight. Back out
screw 4 turns as a preliminary idle adjustment.
3. Upend bowl, place new throttle body gasket in
position and attach throttle body. Tighten screws
evenly and securely.
ASSEMBLY OF BOWL
1. Drop steel pump discharge check ball into pump
discharge hole. Ball is 3/16" diameter (do not con­
fuse with aluminum intake ball). Install pump dis­
charge spring and retainer.
2. Replace cluster and gasket, tighten screws
evenly and securely. Make certain center screw is
fitted with gasket to prevent pump discharge leakage.
3. Replace main metering jets and power valve.
4. Drop aluminum pump intake ball check into
hole in pump well. Install pump return spring,
pressing with finger to center it in pump well.