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HOMESERVICE MANUALSGMC1984PICKUP K2500, 6.2 C, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMCARBURETOR - ROCHESTER 1ME 1-BBLOVERHAULDISASSEMBLYAIR HORN
1984 GMC Pickup K2500, 6.2 C, Standard

Air Horn

1984 GMC Pickup K2500, 6.2 C, StandardSECTION Air Horn
  1. Place carburetor on suitable stand to prevent damage to throttle valve. Pull off vacuum break diaphragm hose. Remove 2 diaphragm assembly attaching screws and diaphragm assembly.
  2. Slide diaphragm plunger stem from choke lever link. DO NOT  attempt to remove screw that retains vacuum break lever to choke shaft. This screw is installed with thread-locking compound. It should not be removed unless choke shaft replacement is required.
  3. Remove fast idle cam attaching screw and cam. Remove choke rod from choke coil lever on end of choke shaft. Remove 3 choke coil housing attaching screws from float bowl; 2 screws have lock washers, and screw facing choke housing has tapered head for locating housing.
  4. If necessary to remove choke coil cover, drill rivet heads from cover retainer using a .159" (No. 21) drill. Using a drift and small hammer, drive remainder of rivets out of choke housing. Remove 3 retainers and cover from housing.
  5. Remove 4 remaining air horn-to-float bowl screws (3 long and 1 short) and lock washers. Carefully remove air horn by lifting and twisting back toward choke housing. Disengage choke coil lever link from choke coil lever at choke housing.
  6. Turn air horn upside-down. If required, remove choke valve and choke shaft by removing screw retaining vacuum break lever to choke shaft. Since screw is retained with thread-locking compound, use care when removing it. Remove 2 choke valve attaching screws. Remove choke valve and shaft from air horn.
NOTE: Choke valve screws are staked in place. File off staking for removal and restake during reassembly. Use care not to bend choke shaft when staking screws.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.