ROCHESTER Model 4G 4-Barrel: Overhaul: Disassembly
- Remove fast idle cam screw, clip from choke rod at cam and remove cam. Remove clip from upper end of choke rod and remove choke rod. Remove choke valve screws and choke valve. Remove choke valve shaft spring, depress accelerator pump lever and remove choke shaft.
- Remove swivel retainer from boss and remove swivel and spring. Remove inlet gasket fitting and strainer. Remove air horn retaining screws, lift air horn straight up to remove.
- Invert air horn, remove float pin from primary float and remove float and needle valve. Mark float as primary float. Remove needle seat with a suitable screwdriver. Remove float pin, float, needle valve and seat from secondary side.
- Remove power piston by depressing spring and allowing to snap back. Remove retainer from accelerator pump plunger shaft and remove accelerator pump by sliding through rubber seal. Remove seal from air horn.
- Remove primary venturi cluster, main jets and power valve. Remove secondary venturi cluster and secondary main jets. Do not mix primary and secondary main jets. Remove accelerator pump return spring from pump well.
- Remove retaining ring, inlet screen and check ball from bottom of pump well. Remove pump discharge guide with a pair of needle nose pliers and remove spring and check ball. Invert float bowl and remove throttle valve body from float bowl.
- Remove auxiliary throttle valve assembly from float bowl. Remove idle mixture screws and springs. Do not attempt to disassemble throttle valve assembly any further.