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HOMESERVICE MANUALSMERCURY1966COMET NOT AVAILABLE, 3.3L ENG VIN T, NOT AVAILABLE TRANSREPAIR AND DIAGNOSISENGINE PERFORMANCEFUEL DELIVERYFORD (AUTOLITE) 4-BARREL MODELS 4300CARBURETOR IDENTIFICATIONNOTES
1966 Mercury Comet Not Available, 3.3L Eng VIN T, Not Available Trans

Carburetor Identification: Notes

1966 Mercury Comet Not Available, 3.3L Eng VIN T, Not Available TransSECTION Notes

Carburetor number Prefix and Suffix (example C6AF BU) is stamped on tag attached to carburetor by one air horn screw. First letter of second line on tag ("A" etc.) indicates design changes which may affect parts replacement. Standard (non-Thermactor) carburetors have aluminum tag.

CHANGES, CAUTIONS, CORRECTIONS 

  • 1967 FORD & MERCURY 410" & 428" ENGINE CARBURETOR LOADING AFTER STARTING CORRECTION (Thermactor Engines with Auto. Trans.):  To correct this complaint, install new "BX" automatic choke cover and thermostatic coil assembly, Part No. C7AZ-9848-C (replacing original "BO" assembly), and set carburetor to following new specifications:

    Automatic Choke -  2 Notches Rich.

    Choke Pulldown Clearance -  -140" (9/64).

    Fast Idle Cam Clearance -  .093' (3/32").

    Fast Idle Speed -  1400 RPM.

  • 1967 COUGAR, FAIRLANE, MUSTANG 289" ENGINE CARBURETOR LOADING AFTER STARTING CORRECTION (All Auto. Trans. Engines with C7DF-9510-D & C7DF-951C-M Carbs.):  To correct this complaint, install ***new BX" automatic choke cover and thermostatic coil assembly, Part No. C7AZ-9848-C (replacing original "CO" or "BO" assembly), and set carburetor to following new specifications:

    Automatic Choke -  Set at Index.

    Choke Pulldown Clearance -  .109" (7/64").

    Fast Idle Cam Clearance -  .080" (5/64").

    Fast Idle Speed -  1350 RPM.

  • 1967 FORD MOTOR CO. 4-BARREL MODEL 4300 CARBURETOR MODIFICATIONS FOR IMPROVED ENGINE PERFORMANCE (289", 410", & 428" V8 Engines except Police Interceptor):  Modify carburetor and make adjustments to correct specific troubles as detailed below.
RENDER: 1.0x

NO RELATED

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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.