ROCHESTER CARBURETORS
Bulletin 9C-328 15 December 1957
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Rochester Carburetors MODEL 2G 1955-58 CHEVROLET V-8 TRUCK ADJUSTMENTS AND SPECIFICATIONS |
BULLETIN 9C-328
PAGE 3 OF 4 DATE:
12/15/57
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1955 SETTING: 1-5/32" -GAUGE, BT-107
1950-57 SETTING: 1-1/4 -GAUGE, BT-129 1958 SETTING; 1-19/64"-GAUGE,
BT-l44
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. Do not compress spring
in needle valve but allow the float to hang freely.
Bend the float arm until the float just
touches the bottom
of the gauge. (Use
Bending Tool BT-69).
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1955-56-57-58 SETTING: l-29/32" -GAUGE,
BT-107, BT-I29, BT-144
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The float drop is correct when the
distance from the air horn gasket to the bottom of the float is
1-29/32", with the
air horn held
upright.
Bend the float tang to adjust; toward
needle seat to lessen drop and away from seat to increase drop.
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1955 SETTING: 15/16" -GAUGE, BT-107 1956-57-58 SETTING: 57/64" -GAUGE, BT-129, BT-144
Back off the throttle stop screw and hold
the throttle valves completely closed. Check the distance from the top
of the air horn casting to the top of the pump rod with the
combination float and pump rod gauge.
To adjust, bend the
pump rod with Bending Tool BT-18.
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1958 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.
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CO, WD, 131, 149, 9X, 9FR, 9FD
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FORM 1256 I.P.S.
PRINTED IN U.S.A,
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