ROCHESTER CARBURETORS

Bulletin 9C-325 15 December 1957

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Rochester Carburetors

MODEL BC

1957-58 CHEVROLET "6"

PASSENGER 235 CUBIC INCH ENGINE

BULLETIN 9C-325
PAGE 3 OF 4 DATE: 12/15/57
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SETTING - 1-9/32", GAUGE M-250
With the air horn inverted and the gasket in place, posi­tion the Gauge M-250 over the floats with the gauge tang inserted in the discharge nozzle. Bend the float arms as necessary so that the top of each float just touches the gauge and the float is centered between the gauge legs.
SETTING - .076", GAUGE BT-99
With the idle screw on the second step and against the high step of the fast idle cam, bend the choke rod as necessary with Tool BT-18 to obtain a clearance of .076 (Tool BT-99) between the lower edge of the choke valve and the air horn wall.
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SETTING ~ 1-3/4", GAUGE BT-93 OR SCALE
Bend the float tang as necessary to obtain a distance of 1-3/4" from the gasket surface to the bottom of the float, with the air horn upright and the float hanging free. Measure with a Scale or Tool BT-93.
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SETTING - .230", GAUGE BT-99
Bend the unloader tang on the throttle lever as necessary with Tool BT-69 to obtain a clearance of .230 (Tool BT-99) between the lower edge of the choke valve and the air horn wall, with the throttle valves wide open.
SET MARK ON COVER TO SPECIFIED POINT ON CHOKE HOUSING
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SETTING-SYNCHROMESH 1957-3 NOTCHES LEAN
1958-1 NOTCH LEAN
SETTING-AUTO. TRANS. 1957-3 NOTCHES LEAN
1958-INDEX
Loosen the three-retaining screws and rotate the choke cover clockwise against coil tension until the index mark on the cover is in the proper position with the index mark on the housing. At room temperature, the choke valves should be lightly closed.
FORM NO. 1253 l.P.S.               PRINTED IN U.S.A.
AUTOMATIC CHOKE ADJUSTMENT
CO, WD, 131, 149, 9X, 9FR, 9FD

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