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.
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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.
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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.
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AUTOMATIC CHOKE ADJUSTMENT
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CO, WD, 131, 149, 9X,
9FR, 9FD
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