Nos Ford Autolite 4100 4v Choke Thermostat Anti Bog 1967 Mustang Shelby 289 Rare on 2040-parts.com
Auburn Hills, Michigan, US
Up for sale is a Ford anti bog, choke thermostat kit. It is in excellent unused NOS condition and was used on Autolite 4100 4V carbs to cure hot/cold bog. The Ford part number is c7az-9d814-a, correct for Mustang, and others. Please read original Ford service modification listed below for more dtails. This is an original vintage Ford part, not a reproduction! Get the right parts for your classic. If you have any questions, please ask, and as always buy with confidence, I have a 100% Ebay rating, thanks and good luck!
A service modification kit has been released to correct customer complaints of
stall or hesitation on subject units built prior to approximately December 1,
1966. This condition can occur with a warm or cold engine. Revised 4300 design
carburetor models which contain the modifications outlined in this article can
be readily identified by the presence of the accelerator pump lever return
spring illustrated in Illus. S1131.
This service modification kit (Part
Number C7AZ-9D814-A, Class "A") contains the necessary parts to modify the
accelerator pump linkage and revise the choke calibration. The following
procedure must be used to properly apply these modifications:
- 1. Remove the accelerator pump lever pivot pin and discard the pump lever,
pump rod and "C" retainer. (Illus. S1124)
2. Remove the vent valve lever (Illus. S1129)
3. Place the revised pump lever between the casting supports and measure the total lever to support clearance. Adjust this total clearance to .010 inch by bending the supports with pliers (Illus. S1130)
4. (Standard transmission units only.) Attach the spring bracket included in this kit to the carburetor base using the screw and lockwasher supplied. (Illus. S1131) Automatic transmission equipped units already contain this bracket to retain the transmission kickdown return spring.
5. Install the vent valve lever, revised pump lever, pivot pin and "E" retainer using the #2 (center) pump adjustment hole. (Illus. S1131)
6. Install the revised pump rod, flat washer and return spring as shown in Illus. SI 131. Be sure the long end of the spring is installed in the pump rod.
7. With the throttle at curb idle, adjust the fuel bowl vent gap to 1/16 inch. Bend the vent valve lever to obtain this clearance. (Illus. S1132) CAUTION: DO NOT BEND THE VENT ARM TO OBTAIN PROPER ADJUSTMENT.
8. Install the revised choke cover (Model "BO") on 390-4V and 428-4V automatic transmission units only and adjust this replacement to an "index"
setting. (Discard the revised choke cover included in the kit when performing this modification to other carburetor models).
9. Start the engine with a tachometer connected and check the choke fast idle engine RPM. (Be sure the choke fast idle adjustment screw is on the intermediate step of the plastic fast idle cam.)
BASE ENGINE - The fast idle speed must be 1200 RPM
THERMACTOR ENGINE - The fast idle speed must be 1400 RPM
10. Reinstall the air cleaner to complete this carburetor modification.
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