1949–1950 Rochester Model AA Carburetor Service Manual

This is the Rochester Model "AA" Carburetor Service Manual, Bulletin 9D-5, fourth printing dated August 1951, issued by United Motors Service, AC Division, General Motors Products of Canada, Limited, Oshawa, Ontario. The copyright date is 1949, and the text mentions the 1950 Model AA. It describes the carburetor developed by Rochester Products Division, Rochester, New York.

The manual explains each fuel system with schematic figures: idle, part throttle, high speed (vacuum power diaphragm and power valve), float with balance spring, diaphragm accelerating pump, and thermostatic choke with vacuum piston. It then gives step-by-step disassembly of the cover and bowl, housing, throttle body and pump, cleaning and inspection, and assembly, including float level and float tension settings and pump stroke lever holes. Mechanics and restorers can use it to rebuild the carburetor. Vehicle applications are not listed.

This 15-page copy is free to read online. Use the page box and thumbnails to move through the book.