Distributor Modification

Rework Distributors C7AF-12127-Y or C7AF-12127-AB by installing new vacuum advance spring, stop, and spacers and recalibrate centrifugal advance mechanism to provide same advance specifications as later C7AF-12127-AG distributor. See Ford and Mercury Tune-Up Pages for distributor rework data.

• 1967 390" V8 THERMACTOR ENGINE HESITATION ON LIGHT THROTTLE ACCELERATION (Auto. Trans, with Carburetor Nos. C7AF-9510-Z or C7OF-9510-M):  Caused by low fuel level on these carburetors. Correct by raising fuel level to 25/32" (was 7/8"). See FUEL LEVEL ADJUSTMENT  data.
• 1967 390" V8 ENGINE ERRATIC ACCELERATOR PEDAL ACTION OR HIGH IDLE RPM CORRECTION (All Engines with 2-Barrel Carbs.):  Caused by throttle valves sticking in throttle bores. Correct as follows: Remove carburetor air horn and gasket, remove booster venturi assembly, remove pump discharge weight and reinstall booster support screw in discharge channel (to retain ball check). Back off idle speed adjusting screw 3 turns, use midget socket set to loosen throttle valve screws 1/2-turn. Rotate throttle shaft from closed to open position, tap valves lightly in closed position to center valves, then tighten valve screws to 27 In. Lbs. (outer screw first). Recheck valves for sticking, then reassemble carburetor and reset idle speed and fuel mixture.
• 1967 MERCURY, COMET, & COUGAR COLD STARTING & DRIVE AW AY PERFORMANCE IMPROVEMENT (390" V8 Thermactor Engines with Auto. Trans. & 2-Barrel Carburetors):  To correct this complaint, modify carburetors as follows:
  1. High Speed Bleeders & Pump Jets.  Remove booster support from carburetor, use No. 61 (.039") drill (High Speed Bleeds), No. 71 (.026") drill (Pump Jets), in pin vise to drill out these passages (see Fig 1 for locations). Use light pressure and turn drill slowly by hand. Blow out passages to remove all drill chips before reinstalling booster support.
  2. Fuel Level.  Change fuel level setting to 3/4".
  3. Automatic Choke Setting.  Change setting to 2 Rich.
     Fig 1: COLD STARTING & DRIVEAWAY IMPROVEMENT

     Courtesy of FORD MOTOR CO.
• 1967 289" THERMACTOR ENGINE HESITATION ON LIGHT ACCELERATION CORRECTION (Auto. Trans. Cars with C7AF-9510-BN or C7DF-9510-V Carburetors and C7AF-12127-AH Distributor):  If condition noted with engine cold or warm, it is primarily caused by lean fuel condition during acceleration. Correct by modifying carburetor and distributor as follows: