Chevrolet 1973 Overhaul Manual page 189

6 M - 1 0 CARBURETORS
Fig. G l-R o che ste r 2GV (SAE 1 1 /4 ) C a rburetor
Except Vega
diaphragm from air horn by removing two
retaining screws.
3. Place carburetor on a clean bench, being careful
not to damage throttle valves. Then remove the fuel
inlet filter nut, filter, spring and two gaskets.
4. Remove pump rod retaining clip from the throttle
lever end of rod, and remove rod from throttle
lever. Rotate upper pump lever counterclockwise,
then remove the pump rod from the pump lever by
aligning squirt on rod with notch in lever.
5. Using a wide bladed screwdriver, remove the fast
idle cam attaching screw rotate cam and remove
from rod.
6. Hold choke valve wide open, then rotate the upper
end of choke rod towards pump lever and remove
the rod from upper choke lever.
7. Remove (8) air horn to float bowl attaching screws,
tap air horn lightly to loosen from bowl and lift air
horn from bowl.
8. Invert air horn and remove float hinge pin, float,
and float needle.
9. Using a wide bladed screwdriver, remove the float
needle seat and gasket.
10. Remove air horn to float bowl gasket.
11. Remove power piston by depressing shaft and
allowing spring to snap sharply — thus forcing
piston from casting.
12. Remove retaining screw from the inner pump lever
and remove outer pump lever and plastic washer
from air horn. Place plunger in gasoline or
kerosene to prevent rubber from drying out.
CAUTION: Do not bend the retaining arm on
the inner pump lever to remove the pump
plunger assembly from the inner lever. Rotate
the pump plunger stem out o f the hole in the
Fig.G 2-Hot Idle C om pensator
inner lever to remove. I f the retaining tang on
the inner lever is bent outward to remove the
pump plunger assembly, throttle sticking can
result.
13. If the choke shaft or valve need replacement,
remove two choke valve screws, then remove choke
valve and slide shaft and lever from air horn.
14. Choke Rod
NOTE: The two choke valve screws are
staked in place, remove the staking before
removing screws.
Disassemble Bowl and T h ro ttle Body (Figure
G4)
1. Remove pump plunger return spring from pump
well, then remove aluminum inlet check ball from
bottom of well. Remove pump inlet screen from the
bottom of float bowl using a pair of needle nosed
pliers.
2. Remove main metering jets and power valve and
gaskets.
3. Remove three screws on top of cluster; then remove
the cluster and gasket from the float bowl.
NOTE: The center cluster screw has a fiber
washer and the two outer screws have lock
washers. Also, the center screw is not
threaded the full length of the body. The
smaller diameter is required for pump jet
discharge.
4. Using a pair of long nose pliers, remove the pump
discharge spring retainer. Then remove the spring
and check ball from the pum p discharge cavity.
5. Invert carburetor and remove three large throttle
body to bowl attaching screws. Throttle body and
gasket may now be removed.
NOTE: Do not tamper with the idle mixture
needles with limiter caps unless perform ing
an overhaul or due to needle damage. This
has been set to test requirements by the
manufacturer.
OVERHAUL MANUAL