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HITACHI 4-Barrel: Overhaul: Disassembly

NOTE: Disassembly and assembly procedures will vary somewhat from vehicle to vehicle, depending upon sales area (Federal or California) and type of transmission. Therefore, some carburetors may not have all parts referred to in the following procedures.
  1. Remove carburetor from vehicle and begin disassembly with semi-automatic choke housing and air horn. Remove vacuum sensing tubes for altitude compensator valve and choke delay valve.
  2. Remove choke heater lead. Remove choke diaphragm No. 2 vacuum sensing tube. Remove altitude compensator valve.
  3. Remove throttle opener and bracket assembly. Remove No. 1 choke diaphragm vacuum sensing tube. Remove dashpot diaphragm and bracket assembly (Man. Trans. only).
  4. Remove throttle return spring, sub-return spring, return spring bracket, bi-metal spring housing and bracket assembly and No. 1 choke diaphragm.
  5. Remove split pin and fast idle rod, hot start assist lever spring and bracket assembly, choke lever, choke return diaphragm and bracket. Remove No. 2 choke diaphragm.
    Fig 1: Removing Jets and Air Bleeds
    G09314428Courtesy of MAZDA MOTORS CORP.
  6. Remove air horn attaching screws and remove air horn assembly from main body. Disconnect float pin and remove float, needle valve, spring, valve stem and retainer.
  7. From main body, remove accelerator pump rod, secondary throttle valve rod, throttle sensor and main body attaching bolts. Remove main body from throttle body.
  8. Remove secondary throttle attaching screws, cover, return spring, pin and clip, diaphragm, housing and gasket. Remove "E" clip, washer and shaft, accelerator pump lever, attaching screws, cover, diaphragm and return spring.
  9. From main body, remove accelerator pump injection screw, nozzle, gasket, weight, outlet check valve, check valve seat, weight and inlet check valve. Remove retainer, blind plug and washer, primary main jet and secondary main jet.
  10. Remove air bleeds and jets. See Fig 1. Using a hacksaw, remove idle limiter cap by cutting through limiter cap and mixture adjusting screw 0.4" (10 mm) from cap end. Remove and discard mixture adjusting screw and spring.
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