ROCHESTER CARBURETORS
Bulletin 9C-311 15 February 1957
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Rochester Carburetors
MODEL 2GC
1955-1956 CHEVROLET "V-8"
ADJUSTMENTS AND SPECIFICATIONS
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BULLETIN 9C-311
PAGE 3 OF 4
DATE: 2-15-57
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SETTING: 1955 - l-5/32"-GAUGE, BT-107 1956 -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.
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SETTING: 1955 -
15/16"-GAUGE, BT-107 1956 - 57/64"-GAUGE, BT-129
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With the idle screw backed out and the
throttle valves completely closed, bend the pump rod as necessary with
tool BT-18 to obtain the proper measurement from the top of the air
horn casting to the top of the pump rod.
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SETTING: 1955-56 - INDEX
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.
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SETTING: 1955 -
1-29/32"-GAUGE, BT-107 1956 - l-29/32"-GAUGE, BT-129
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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.
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CHOKE ROD ADJUSTMENT
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SETTING: 1955-56 - .089"-GAUGE, BT-108
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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 between the upper edge
of the choke valve and the air horn wall.
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CO, WD, 131, 149, 9X, 9FR
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FORM 1228 I.P.5.
PRINTED IN U.S.A.
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