RCB 9D-7 Model "BB"

Bulletin 9D-7 August, 1961 Model "BB" Page 12

ROCHESTER PRODUCTS, DIVISION OF GENERAL MOTORS, ROCHESTER, NEW YORK

4. Place air horn gasket on top of air horn. Check to be sure that all air horn and gasket holes are properly aligned. 5. Hold Power Piston down and attach main well support over power piston and attach screws to air horn evenly and securely. 6. Install main metering jets in main well support. 7. Assemble clip to float and needle and assemble float needle in seat and float to air horn. NOTE: Float needle and seat are factory matched and if replacement is required, they should be replaced in pairs as factory matched needle and seat. 8. Install float balance spring and clips. Place float carefully in position with tang at rear of float facing air horn. Install float hinge pin. (Figure 10)	Float Balance Spring

	Figure 10

FLOAT ADJUSTMENTS FLOAT LEVEL ADJUSTMENT This adjustment is made with air horn gasket in position and air horn inverted on flat surface. 1. Carefully bend float arms vertically until floats appear level in relation to each other. 2. Place Float Gauge in position as shown, (Figure 11) with locating tangs inserted into the secondary Venturi to position gauge. 3. Bend float button, which contacts the float needle, until the floats just touch the top portion of the gauge 4. Now bend arms horizontally until each float is centered between the gauge legs. Tilt Air Horn assembly 90° each side and check that floats do not touch gauge legs. This insures the floats will not rub sides of float bowl. FLOAT TENSION ADJUSTMENT To insure proper fuel level and sufficient entry of fuel into the bowl under high speed operation the float tension adjustment must be made as follows: bend the float tang, at the rear of the float, against the balance spring to lessen the drop and away from the balance spring to increase the drop. The tension is correct when the distance from the bottom of the air horn gasket to the bottom of the floats, with the air horn assembly held in an upright position, is equivalent to the distance marked between arrows on the carburetor float gauge.