ROCHESTER CARBURETORS

Bulletin 9C-302 1 April 1953

CHEVROLET-1952 POWERGLIDE-Auto. Choke Carb.-7003526
CARBURETOR ADJUSTMENTS
Make adjustments in following order—
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FIGURE 1
FLOAT LEVEL ADJUSTMENT
With air horn fully assembled, gasket in position and assembly up-ended an a flat surface (Figure 1):
1.   Place float level gauge in position with gauge tang inserted in discharge nozzle.
2.   Bend float arms vertically so that each float just touches top portion of gauge.
3.   Bend float arms horizontally so that each float is cen­tered in gauge.
4.  Tilt assembly 90° each side and check that floats do not touch gauge.
FIGURE 3
CHOKE ROD ADJUSTMENT
1.   With the stat cover properly indexed (so that the scribed index mark on the cover is in line with the long cast mark on the choke housing) turn the idle screw in until it contacts the second step of the fast idle cam against the shoulder of the first step. (Figure 3).
2.   Holding the screw tightly against the cam, bend the choke rod at the dog leg until the small end of the com­bination gauge (173") just slides easily between the lower edge of the choke valve and the bore of the carburetor air horn.
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FIGURE 2
FLOAT DROP ADJUSTMENT
As shown in Figure 2, to insure sufficient entry of fuel under high speed operation, it is necessary to check and adjust she float drop. With air horn held right side up and floats suspended freely, carefully bend the float tang at the rear of the float assembly so that ihe bottom of the float is 1-3/4" below the gasket surface. Install air horn assembly to float bowl and tighten screws evenly and securely.
FIGURE 4
UNLOADER ADJUSTMENT
With the throttle lever in the full wide open position, there should be a clearance between the lower edge of the choke valve and the bore of the carburetor air horn so that die "large end of the combination gauge (.l66") will just slide freely (Figure 4). Bend the tang on the throttle fever to obtain the necessary clearance. NOTE: No other carburetor adjustments are required.

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