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ROCHESTER Models M & MV Single Barrel: Overhaul: Disassembly

  1. If equipped with C.E.C. valve, remove vacuum hose from valve and timed spark tube, then bend back retaining tabs on lockwashers and remove large C.E.C. valve nut and remove valve from bracket.
    NOTE: Do not remove C.E.C. valve bracket from float bowl unless replacement of bracket is necessary.

    Remove electrically operated idle stop solenoid wire connector and unscrew solenoid (if equipped) from float bowl casting by turning solenoid body counterclockwise.

    NOTE: Do not immerse C.E.C. valve assembly or idle stop solenoid in any type of carburetor cleaner.
  2. Remove fast idle cam attaching screw, remove cam from choke rod at lower end by rotating over squirt on rod and from upper lever by rotating rod out of slot. Remove air horn to float bowl attaching screws (6) and remove air horn by lifting straight up. Invert air horn and remove two vacuum break diaphragm cover screws and carefully remove diaphragm cover.
  3. Hold choke valve open, push upward on eyelet on choke valve at a 45° angle until looped end of rod slides off wire lever attached to choke valve, then remove diaphragm plunger rod through hole in air horn. If necessary, choke valve, vacuum break lever, and choke shaft can be removed from air horn by removing thermostatic coil lever attaching screw, then removing thermostatic coil lever and two choke valve attaching screws; remove choke valve and shaft from air horn.
    NOTE: Choke valve screws are held in place with Loc-tite, so it will be necessary to re-stake them after assembly.
    CAUTION: Do not remove air cleaner stud bridge as Loc-tite is used on attaching screws.
  4. Remove air horn to float bowl gasket (gasket has slit next to metering rod lever). Remove float assembly from bowl by lifting upward on float hinge pin, then remove hinge pin from float arm and remove float needle from seat. Disconnect accelerator pump and power piston actuator lever from end of throttle shaft by removing lever attaching screw. Hold down on power piston while removing lever, power piston spring and metering rod assembly may now be removed from float bowl.
  5. Remove lower end of power piston link from actuator lever by rotating until tang on rod slides out of notch in lever. Remove actuator lever from lower end of accelerator pump link in same manner. Push down on accelerator pump and remove actuator link by rotating until tang on rod is aligned with slot on pump plunger lever, remove link.
  6. Remove pump assembly from float bowl, then remove pump return spring and power piston spring from float bowl. Remove "T" guide and pump discharge spring using needle nose pliers. Invert bowl and remove pump discharge ball and idle tube. Remove main metering jet from bottom of fuel bowl and remove float needle seat and gasket using suitable tool (BT-3007). Remove two screws from idle compensator cover, then remove cover, hot idle compensator and seal from recess in bowl.
  7. The idle stop screw can now be removed. Remove fuel inlet nut and gasket, then remove filter and relief spring. Invert carburetor bowl and remove throttle body to bowl attaching screws, throttle body and insulator gasket.
    NOTE: Due to close tolerance fit, do not remove valve or shaft.
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