ROCHESTER CARBURETORS

Bulletin 9C-331 15 December 1957

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Rochester Carburetors MODEL 4G
VACUUM OPERATED GOVERNOR
1957-58 CHEVROLET V-8 TRUCK
ADJUSTMENTS AND SPECIFICATIONS
BULLETIN 9C-331
PAGE 3 OF 4 DATE: 12/15/57 REPLACES:
9C-324, 10/15/56
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SETTING 1-1/16", GAUGE BT-145 OR SCALE
Back out idle screw until throttle valves are completely closed. Place combination "pump" and "vent" gauge on top of air next to pump plunger, as shown. With the throttle valves closed and lower edge of gauge resting on top of air horn, the pump plunger shaft should slide freely into hole of gauge marked "pump"
Bend the pump rod with Bending Tool BT-18 as shown to adjust.
SETTING-SEE SPECIFICATIONS, PAGE 4 FOR GAUGES AND DIMENSIONS
With the air horn gasket in place, position the gauge over the floats and against the curvature in the air horn bore. Bend the float arms at the rear of the assembly so floats just touch the gauge. Then bend float arms horizontally to center each pontoon between the gauge legs. Repeat with same gauge on other set of floats.
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SETTING 31/32", GAUGE BT-145 OR SCALE
Note: Make pump rod adjustment before adjusting idle vent valve.
Place combination "pump" and "vent" gauge on top of air horn with side marked "vent" next to pump plunger shaft, as shown.
Open throttle valves to point where the vent valve is just closed. With the throttle valves held in this position, the hole marked "vent" on the gauge should slide freely over pump plunger shaft.
Bend the tang on the pump lever, as shown to adjust.
SETTING 2-1/4", GAUGE BT-93 OR SCALE
Bend the float tang as required to obtain a distance of 2-1/4" from the gasket surface to the bottom of the float, with the float hanging free.
CO, WD, 131, 149, 9X, 9FR, 9FD
FORM NO. 1259 PRINTED IN U.S.A.

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