ROCHESTER CARBURETORS
Bulletin 9C-305 15 October 1954
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CHEVROLET
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1953-54-55 TRUCK — 235 Cubic Inch Engine
CARBURETOR 7004468
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CARBURETOR ADJUSTMENTS
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FLOAT
LEVEL ADJUSTMENT
(Use Tool M-250)
With air horn fully
assembled, air horn gasket in position and assembly inverted (Figure
1) :
1.
Place float level gauge, M-250, in
position as shown, with
gauge projection inserted in discharge
nozzle.
2. Carefully
bend float lip
vertically so that each
float just touches top portion of gauge. If one
float is higher than the other,
slightly bend the float arms to bring them into alignment.
3.
To prevent sides of floats from
rubbing inside of bowl bend
float arms horizontally so that
each float is centered in the
gauge.
4.
Tilt assembly 90° each side and
check that floats do not
touch gauge.
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FIGURE 1
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FLOAT
DROP ADJUSTMENT (Use
Tool BT-93)
To insure sufficient
entry of fuel into the bowl under high speed operation it is necessary
to check and adjust the float drop as shown in Figure 2. With the air
horn held upright and the floats suspended freely, carefully bend the
drop tang at the rear of the float assembly so that the bottom of the
float is 1-3/4" below the air horn gasket surface. Use float drop
setting gauge BT-93. Install air horn assembly to bowl and tighten
cover screws evenly and securely.
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FIGURE 2
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Note—Float Level Gauge M-250, and Float
Drop Setting Gauge BT-93 ale available through U.M.S.
Distributors,
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