GMC 1976 ZEO 6083 Maintenance Manual page 357

Figure 11-Secondary Metering Rods
2. Remove upper choke lever from the end of
choke shaft by removing retaining screw (figure 10).
Then remove the upper choke lever from the end of
choke rod and choke rod from lower lever inside the
float bowl casting.
NOTE :
Remove rod by holding lower lever out-
ward with small - screwdriver and twisting rod
counterclockwise .
3. Remove vacuum break hose, remove vacuum
break bracket attaching screws . The diaphragm as-
sembly may now be removed from the dashpot rod
and the dashpot rod from the air valve lever.
4. Remove secondary metering rods by removing
the small screw in the top of the metering rod hanger .
Lift upward on metering rod hanger until the sec
ondary metering rods are completely out of the air
horn . Metering rods may be disassembled from the
hanger by rotating ends out of the holes in the end
of the hanger (See figure 11).
5, Remove nine air horn to bowl attaching
screws ; two attaching screws are located next to the
primary venturi. (Two long screws, five short screws,
two countersunk screws .) See Figure 12 .
6. The air horn assembly may now be removed
from the float bowl by opening the throttle valve
wide open and lifting up on the air horn and turning
sideways until the pump rod disengages from the
upper pump lever as shown in Figure 15 .
CAUTION :
Care must be taken not to bend
the small bleed tubes and accelerating tubes
in air horn casting. These are permanently
pressed into casting. Do Not Remove.
ENGINE FUEL SYSTEM
6M- 15
Figure 12-Air Horn Attaching Screws
AIR HORN DISASSEMBLY
Further disassembly of the air horn is not recom-
mended for cleaning purposes . If part replacement is
required, proceed as follows :
1 . Remove choke valve attaching screws, then
remove choke valve and shaft from air horn .
NOTE :
Air valves and air valve shaft should not
be removed. However, if it is necessary to re-
place the air valve closing spring or center plas-
tic eccentric cam, a repair kit is available.
Instructions for assembly are included in the
repair kit.
Figure 13-Removing Air Horn