Pontiac tempest 1968 Service Manual page 337

6B-30 1968 P O N T I A C SERVICE M A N U A L
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Fig. 6B-72 Vacuum Break Adjustment
wall next to the vent stack, to the top of the pump
plunger stem is 3/8". At this point the idle vent
should just close.
Bend wire tang on pump lever to adjust.
AIR VALVE DASHPOT ADJUSTMENT (Fig. 6B-67)
Using an external vacuum source to seal the vac­
uum break diaphragm, and with the air valve closed
the clearance between the dash pot rod and end of
slot in air valve lever should be as specified.
AIR VALVE SPRING ADJUSTMENT (Fig. 6B-68)
Loosen lock screw and turn adjusting screw coun­
terclockwise to remove spring tension. With air
valve closed, turn adjusting screw clockwise 1/2
turn after the torsion spring contacts pin and tighten
lockscrew.
_
L | N K
SHOULD BE IN
CENTER OF SLOT
Fig. 6B-74 Secondary Opening Adjustment
FAST IDLE ADJUSTMENT (Fig. 6B-69)
With primary throttle valves completely closed and
cam follower over high step of fast idle cam, turn
fast idle screw in 2 turns after screw makes contact
on lever. Adjust on car with cam follower on high
step and choke valve open to obtain rpm as specified.
CHOKE ROD ADJUSTMENT (Fig. 6B-70)
With fast idle adjustment made, and cam follower
on second step of fast idle cam and against the
high step, rotate the choke valve toward the closed
position by pushing up on the vacuum break tang.
Dimension between the lower edge of choke valve,
at choke lever end, should be as specified. Bend rod
to adjust.
CHOKE COIL ROD ADJUSTMENT (Fig. 6B-71)
With choke valve closed by pushing up on vacuum
break tang and fast idle cam released from choke,
BEND TANG TO ADJUST
Fig. 6B-73 Unloader Adjustment
Fig. 6B-75 Secondary Closing Adjustment