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1957 CHEVROLET —
MODEL 2GC CARBURETOR
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1.
FLOAT
LEVEL
(1-1/4",
Gauge BT-129)
With the air horn inverted and the gasket in
place, position the float level
gauge over the float so
that it rests against the pump side of the power
piston shaft, with the outer gauge
leg in line with the center
of the float. Bend the float arm to adjust.
2.
FLOAT DROP
Bend the float tang
as required to obtain a distance of 1-29/32" from the gasket surface
to the bottom of the float, with the air horn upright and the
float hanging free. Use scale or
scribed mark on float and pump gauge.
3.
PUMP ROD
(57/64",
Gouge
BT-129)
With the idle screw
backed out and the throttle valves completely closed, bend the pump
rod as necessary with tool BT-18 to obtain a distance of 57/64" from
the top of the air horn casting to the top of the pump rod.
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4. AUTOMATIC CHOKE
Loosen the three
retaining screws- and rotate the choke cover counter-clockwise against
coil tension until the index mark is in line with the index point
on the choke housing. At room
temperature the choke valve should be lightly closed.
5.
CHOKE ROD
(.089,
Gauge
BT-108)
Turn the idle screw
in until it just contacts the second step of the fast idle cam. With
the screw resting on the second step and against the high step, bend
the choke lever tang with Tool BT-69 as necessary to admit the small
end of the gauge etween the upper edge of the choke valve and the air
horn wall.
6. UNLOADER
(.360", Gauge BT-108)
Bend the unloader
tang as necessary with Tool BT-69 to provide clearance for the large
end of the gauge when the throttles are opened wide.
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,._______________QUICK
REFERENCE
ADJUSTMENT SPECIFICATIONS_____________________
ADJUSTMENT
DIMENSION
GAUGE
Float Level
1-1/4"
BT-129
Float Drop
1-29/32"
BT-129
or Scale
Pump Rod
57/64"
BT-129
Automatic Choke
Index
-----------
Choke Rod
.089
BT-108
Unloader
.360
BT-108
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