ROCHESTER CARBURETORS

Bulletin 9C-326 15 December 1957

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Rochester Carburetors
MODEL 2GC
1958 CHEVROLET "V-8"
ADJUSTMENTS AND SPECIFICATIONS
BULLETIN 9C-326
PAGE 3 OF 4 DATE: 12/15/57
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SETTING: 1-19/64"~GAUGE, BT-144
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.
SETTING: 57/64"~GAUGE, BT-144
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: 1-29/32"-GAUGE, BT-134
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.
SETTING: 49/64"~GAUGE, BT-144
Note: Make pump rod adjustment before adjusting idle vent valve. Place Gauge BT-144 on top of pump housing on air horn, as shown, with leg of gauge marked "Vent" above pump rod. Slowly open throttle valves until vent valve just closes. With throttle valves held in this position, lower edge of gauge leg marked "Vent" should just touch top of pump rod. To adjust bend tang on pump lever as shown.
SETTING - 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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SET MARK ON COVER TO SPECIFIED POINT ON CHOKE HOUSING
AUTOMATIC CHOKE ADJUSTMENT
CO, WD, 131, 149, 9X, 9FR, 9FD
FORM 1254 I.P.S. PRINTED IN U.S.A.

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