Pontiac tempest 1968 Service Manual page 321

6B-14 1968 P O N T I A C SERVICE M A N U A L
FAST IDLE CAM
ATTACHING SCREW
CHOKE DIAPHRAGM
VACUUM CHANNEL
IDLE SPEED
SCREW
METERING ROD
RETAINER
SPRING
METERING ROD-
ADJUSTABLE
PART THROTTLE
METERING ORIFICE
IDLE COMPENSATOR
AIR CHANNEL
MAIN DISCHARGE
NOZZLE
PUMP DISCHARGE BALL
8 SPRING RETAINER
... IDLE TUBE
ACCELERATOR
PUMP PLUNGER
FLOAT NEEDLE
AND SEAT
MAIN METERING JET
F i g
0
6 B - 3 0 Float Bowl Assembly
FLOAT BOWL ASSEMBLY (Fig. 6B-30)
1. Install fast idle cam to boss on float bowl, at­
taching with fast idle cam screw. Tighten securely.
Part number on cam faces outward.
2. Install slow idle adjustment screw, if removed.
3. Install seal into recess in idle compensator
cavity in float bowl, then install idle compensator.
4. Install idle compensator cover, retaining with
two attaching screws. Tighten securely.
5. Install main metering jet into bottom of float
bowl. Tighten securely.
6. Install pump return spring into pump well.
Make sure spring is properly seated in bottom of
well.
7. Install pump plunger into pump well with actuat­
ing shaft protruding through bottom of bowl casting.
Push downward on pump plunger and install pump
drive link into hole in lower end of plunger shaft.
Ends of drive link point toward carburetor bore.
Lip on upper end of link retains link to pump shaft.
8. Install pump actuating lever to lower end of
pump drive link by aligning lip on rod with notch
in lever. Projection on actuating lever points down­
ward. Install power piston actuating link into op­
posite end of actuating lever. Lower end of link has
retaining lip and faces outward (away from throttle
bore).
9. Install end of power piston actuating rod into
groove on side of power piston. Then install power
piston spring, power piston, metering rod assembly
and actuating rod into float bowl. End of metering
rod must enter jet orifice.
10. Hold complete assembly downward in bowl,
then install power piston drive link into hole in
lower end of power piston actuating rod (beneath
bowl). Align D hole i n actuating lever with flats on
throttle shaft and install lever on end of throttle
shaft. Install retaining screw in end of throttle shaft
and tighten securely.
11. Install idle tube into cavity in float bowl.
12. Install pump discharge ball, spring and spring
retainer. Make sure spring retainer is in flush with
top of bowl casting.
13. Install fuel filter relief spring, fuel inlet filter,
filter nut and gasket. Tighten to 25 lb. ft.
NOTE: Open end of filter should face hole in fuel
inlet nut.
14. Install float needle seat and gasket and tighten
securely using care not to damage needle seat.
15. Install float needle valve into needle seat.
16. Insert float hinge pin into float arm. Then in­
stall float and hinge pin into float bowl.
17. FLOAT LEVEL ADJUSTMENT (Fig. 6B-31)
a. Hold float retaining pin firmly in place and
float arm against top of float needle, by pushing
downward on float arm at point between needle
seat and hinge pin, as shown.
b. With adjustable T-scale, measure distance
from top of float at toe to float bowl gasket sur­
face (gasket removed). Measurement should be
made at point 1/16" in from end of flat surface at
float toe (not on radius).
78. METERING ROD ADJUSTMENT (Fig. 6B-32)
a. Remove metering rod by holding throttle
valve wide open. Push downward on metering rod
Fig. 6 B - 3 I Float Level Adjustment