Chevrolet 10 series 1973, Overhaul Manual

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C ARBURETORS 6 M - 1 9
mixture needle and limiter cap kit. This cap must be
installed after the idle mixture needle has been set on
engine (see Specifications), by backing off the new
mixture needle the same number of turns, after
bottoming, as was required to bottom the original needle
which was pre-set and sealed by the manufacturer before
it left the factory. (See "N ote" in disassembly
procedures). Install new limiter cap after checking
carburetor installed in engine.
CAUTION: Do not force the idle mixture
needle against the seat or damage will result.
2. Invert the float bowl, and place new throttle body
gasket in position over locating dowels and attach
throttle body to bowl with three attaching screws.
Tighten screws evenly and securely.
3. Drop steel pump discharge ball into pump
discharge cavity. Ball is 3/16" diameter steel. Install
pump discharge spring and retainer.
NOTE: The top of retainer should be flush
with top of float bowl casting beneath venturi
cluster.
4. Install plastic main well inserts into main well. Top
of insert should be flush with top of casting.
5. Install small aluminum ball into the bottom of
pump well inlet channel and make sure the ball is
seated in channel. Install the pump return spring
into pump well, apply finger pressure to center it in
the pump well over the inlet check ball. Install the
pump inlet strainer into the cavity provided in the
bottom of float bowl and make sure that it is seated
securely. Figure V5 shows the float bowl and
throttle body at this stage of assembly.
6. Install hot idle compensator assembly and gasket
(where used) and tighten screws evenly.
Assembly of Air Horn (Figure V6)
1. On 2GV Models, install choke kick lever on choke
shaft with tang on kick lever towards lever on shaft.
2. On 2GV Models, install choke shaft into up ended
air horn—insert shaft left to right.
3. On 2G Models, install torsion spring and choke
lever and swivel assembly on air horn. Install retain
annular ring in groove.
4. Center choke valve on choke shaft with letters
"RP" facing upward. Install choke valve screws and
tighten securely. Stake screws to eliminate any
possibility of their coming loose. (On 2G Models,
connect torsion spring to idle cam lever).
5. Install accelerator pump plunger and rod to pump
inner lever-end of plunger rod points inward.
6. Position accelerator pump outer lever with plastic
washer partially through air horn and align flats on
inner lever and outer lever shaft install and secure
levers with retaining screw.
7. Install power piston in vacuum cavity. Make sure
Fig. V 5 -B o w l A s s e m b ly -P a rts Location
Fig. V 6 -A ir Horn A s se m b ly -P a rts Location
that piston travels freely in cavity. Lightly stake
retainer in place.
8. Install float needle seat gasket into casting, then
install needle seat and tighten securely with a wide
bladed screwdriver. Position float needle into seat.
9. Install splash shield to float retainer legs—notch in
shield toward accelerator pump.
10. Install air horn-to-bowl gasket making sure gasket
is indexed with locating dowel.
11. Position cut out in float toward power piston and
OVERHAUL MANUAL