1948 Carter BB Updraft Carburetor Service Procedure

This is the Carter Carburetor service procedure for the BB updraft carburetor (BB Circuit), published by the Carter Carburetor Division of ACF Industries, St. Louis, as Form 3325A. It is dated November 1937 and was revised in August 1948. It names no specific vehicle makes or models.

The sheet is a photo-illustrated, 52-step circuit method that uses the Carter Tool Kit. Disassembly covers the choke link, bowl cover, float and lever, step-up, pump and check valves, vent tube, idle orifice tube, nozzle, needle and seat, main metering screw, choke assembly, pump assembly, throttle valve and shaft, and idle screw and port plug. Reassembly groups the parts into five circuits: gasoline level, idle, high speed, pump and choke. Notes cover float level setting by bending the lip, new gaskets, throttle valve position, and flange gasket choice for cars with or without a governor. It suits restorers and mechanics rebuilding a BB carburetor.

This 4-page copy is free to read online. Use the page box and thumbnails to move between pages.