Ford 6 CYL.

240" Engine	(No Thermactor)
	(Synchro-mesh)	C6AF-9510-R
	(Auto. Trans.)	C6AF-9510-S. BL
240" Engine	(With Thermactor)
	(Synchro-mesh)	C7AF-9510-AA
	(Auto. Trans.)	C7AF-9510-AB
240" Engine Taxicab
	(Synchro-mesh)	C6AF-9510-AK
	(Auto. Trans.)	C6AF-9510-BM

CHANGES, CAUTIONS, CORRECTIONS 

• THERMACTOR ENGINE CARBURETORS:  These carburetors used on engines with Thermactor Exhaust Emission Control System have special jet calibration and other parts and require special adjustment procedure as listed below.
• 1963 144", 170" & 223" ENGINE SLOW RETURN TO IDLE SPEED CORRECTION:  Reduce the number of turns inward on dashpot adjusting screw to 2 turns (normal setting is 3 1/4-3 3/4 turns in from initial contact).
• 1963 144" & 170" ENGINE FAILURE TO IDLE DOWN TO NORMAL IDLE SPEED CORRECTION:  This condition may be caused by a restriction in idle passage. To correct, remove air horn and clean idle passage.
• 1963 FALCON 144" ENGINE CARBURETOR JET PRODUCTION CHANGE (FOR IMPROVED FUEL ECONOMY):  One size leaner jets (stamped 52F) used on later carburetors with yellow or green paint on code tag. If a lean condition is encountered, install a one size richer jet (stamped 53F).
• 1963 6 CYL. ENGINE HARD STARTING CORRECTION (Manual Choke Carburetors):  May be caused by excessive length of choke control wire interfering with pulldown rod or choke shaft lever. To correct, shorten length of choke wire making certain that choke wire conduit extends 1/4-1/2" beyond the clamp.
• 1964 COMET 170" & 200" 6 CYL. ENGINE HARD HOT STARTING CORRECTION (EARLY CARS WITHOUT WATER HEATED CHOKE):  Remove air cleaner and reroute heater return hose next to automatic choke cover and install new choke cover screws, Part No. C3AZ-9B874-A. Position hose clamp, Part No. C3AZ-18572-A over heater hose and choke cover and install clamp retaining screws. Install air cleaner on carburetor.
  NOTE: Later cars have the above parts installed in production.
• 1964 144" ENGINE SURGE CAUSED BY A LEAN CARBURETOR CONDITION CORRECTION:  If this condition cannot be corrected by carburetor adjustment, enlarge idle channel restrictor as follows: Remove carburetor upper body assembly, then remove float and needle valve. Use a No. 55 (.052") drill in a pin vise and drill out the idle channel restrictor passage.
  NOTE: Coat drill with heavy lubricant and hold carburetor upper body assembly so that air horn is in same position as when installed on carburetor. Drill by hand only and make sure that all metal chips are removed.

  After a road test, if there are any traces of surge, install a No. 54 (Part No. C3GY-9533-C) main metering jet.

• 1963-65 SIX CYLINDER ENGINE HARD COLD STARTING CORRECTION:  May be caused by automatic choke sticking due to corrosion and dirt deposits on choke pulldown rod and choke lever and swivel assembly. Correct by disassembling choke pulldown rod and swivel assembly and cleaning these parts thoroughly (clean up rod with fine emery cloth, ream choke swivel inside diameter with #25 drill). Reassemble choke mechanism and adjust choke pulldown. See ADJUSTMENTS .
• 1965 FORD 240" SIX CYL. ENGINE HARD COLD START-ING CORRECTION:  May be caused by sluggish choke mechanism due to choke shaft friction in choke housing. On carburetors with original brass automatic choke shaft, replace shaft with later type phosphate coated steel shaft, Part No. C5AZ-9546-A.
  NOTE: This shaft used in production after Feb. 12, 1965.
• 1964-66 SIX CYL. 170" & 200" ENGINE ROUGH IDLE & SURGE CORRECTION (Non-Thermactor Engines):  If this complaint not corrected by regular Tune-Up (Distributor Dwell, Ignition Timing, Carburetor Idle Speed & Mixture), check Distributor advance performance, Engine Temperature (check thermostat action), and check for vacuum leaks at all joints and fittings. If condition persists, modify carburetor as follows: