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HOLLEY Single Barrel Model 1920: Overhaul: Disassembly

  1. Disconnect and remove vacuum hose from vacuum kick diaphragm, disengage operating link and remove vacuum diaphragm and bracket assembly.
    NOTE: Bowl vent valve rod and spring will fall out as vacuum diaphragm bracket is removed.
  2. Remove fuel inlet needle valve and seat. Take out economizer retaining screws, then lift out economizer cover, diaphragm, and stem assembly.
  3. Remove fuel bowl attaching screws, remove fuel bowl, baffle, and gasket (discard gasket). Slide baffle out of bowl. Remove float retaining clip, then slide float off fulcrum pin. Remove economizer body and plugs assembly from fuel bowl. Tilt pump lever on its pivot to free hook on pump diaphragm stem, slide pump diaphragm and spring *** of fuel bowl. Use suitable wrench (C-3748) to remove main jet from economizer body.
  4. Remove pump lever retaining clip, slide lever off pivot and disengage link from throttle lever. Take out fast idle cam retaining screw, remove cam and disengage fast idle cam rod. Remove idle mixture adjusting screw and spring from throttle flange, remove curb idle and fast idle adjusting screws and springs from throttle lever.
  5. Take out choke valve retaining screws, lift choke valve out, withdraw choke shaft and lever from air horn.
  6. Do not remove throttle valve and shaft unless installation of new parts required (manufacturer recommends replacement of carburetor assembly if wear is extreme). Mark position of throttle valve in bore, remove throttle valve screws (screws are staked and care should be taken not to break them off in shaft), lift throttle valve out and remove throttle shaft from carburetor body.
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