Pontiac firebird 1968 - Page 338

ENGINE FUEL
6B-31
MEASURE FROM CASTING
SURFACE NEXT TO AIR
CLEANER STUD HOLE TO
TOP OF METERING ROI
Fig. 6B-76 Secondary Metering Rod Adjustment
hold choke coil rod against stop in thermostat hous-
ing. Choke coil rod should fit in center notch in
counterweight lever as shown. Bend choke coil rod
to adjust.
VACUUM BREAK ADJUSTMENT (Fig. 6B-72)
Using an external vacuum source to seat the vac-
uum break diaphragm, and with choke valve held
toward the closed position, the dimension between the
lower edge of choke valve and air horn should be as
specified.
UNLOADER ADJUSTMENT (Fig. 6B-73)
With choke valve held in closed position, open
primary throttle to wide open position. With valves
in this position, the dimension between lower edge
of choke valve and air horn should be .300". Bend
tang on fast idle lever to adjust.
SECONDARY OPENING ADJUSTMENT (Fig. 6B-74)
Open primary throttle valves until actuating link
contacts tang on secondary lever. With the valves in
this position the bottom of the link should be in the
center of the slot in the secondary lever.
Bend tang on secondary lever if necessary to
adjust.
ROD IN TOP
OF SLOT-
CHOKE VALVE
WIDE OPEN
SPECIFIED CLEARANCE
BETWEEN FRONT EDGE
OF VALVE AND TANG
1
Fig. 6B-77 Air Valve Lockout Adjustment
SECONDARY CLOSING ADJUSTMENT (Fig. 6B-75)
Set idle screw to recommended rpm making sure
cam follower is not resting on fast idle cam. The
clearance between actuating link and front of slot in
secondary lever when tang of actuating lever on
primary shaft is against pin should be .020".
Bend tang on primary actuating lever if necessary
to adjust.
SECONDARY METERING ROD ADJUSTMENT (Fig. 6B-76)
Measure from the top of the metering rod to the
top of the ,air horn casting next to air cleaner stud
hole, dimension should be 53/64". To adjust, bend
metering rod hanger at point shown, making sure
both rods are adjusted evenly.
AIR VALVE LOCKOUT ADJUSTMENT (Fig. 6B-77)
With the choke valve open, apply sufficient force
to thermostat tang to move choke rod to top of slot
in choke lever. Move air valve in direction of open
valve. Bend upper end of air valve lockout lever, if
necessary to given an opening of .015" between lock-
out tang and front edge of air valve.