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Home >> GMC >> 1974 >> Magnavan >> Repair and Diagnosis >> Engine Performance >> Specifications >> ROCHESTER Models 4MC & 4MV 4-Barrel >> Overhaul >> Disassembly >> Float Bowl

Float Bowl

  1. Remove pump plunger. Remove air horn gasket from dowels on secondary side, then remove gasket from around power piston and primary metering rods. Remove pump return spring, plastic filler over float valve, and power piston and main metering rods (use needle-nose pliers and pull straight up on metering rod hanger directly over power piston).
  2. Remove power piston spring, disconnect tension spring from top of each metering rod, and remove rods from hanger. Remove float assembly by sliding assembly toward front of bowl to disengage needle pull clip. Be careful not to distort pull clip. Remove float needle retainer and needle assembly.
  3. Remove primary metering jets.
    CAUTION: Do not remove secondary metering discs.

    Remove pump discharge check ball retainer and check ball, and remove baffle from secondary side of bowl. On 4MV carburetors, remove vacuum hose from tube connection on bowl and from vacuum break assembly. Remove choke assembly from float bowl

    NOTE: (If further disassembly of choke is necessary, remove vacuum brake link. Spread retaining ears on bracket next to vacuum break assembly and remove assembly from the lever).
  4. Remove fast idle cam from choke assembly. Remove lower choke rod and actuating lever from inside the float bowl well. Remove hot idle compensator and "O" ring from float bowl.
  5. Remove fuel filter and spring. Remove throttle body-to-bowl screws and remove throttle body and insulator gasket.
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