MTFCA Forum

Hi all,
I'm trying to understand how the priming and adjusting rod works. It adjusts the air fuel mixture on the Holley, right? And attached to this rod is a clip for the wire to the choke to adjust the choke, right? When one turns the rod from the dashboard, aren't you adjusting both at the same time? On my 27 Toudor the clip has a screw (not original) that should hold it from moving, but mine does not. What is the way this system works? When one turns the rod from the dash, do both air fuel mixture and choke valve open? It this the way it normally works? I'm confused.
Thanks for any suggestions. I've attached a picture.
John

John

The 'sleeve' is that, just a sleeve. That allows the rod to turn within the sleeve, and the rod only adjusts the carb needle, by turning the needle closed or open.

The choke is independent off the needle adjustment. This 'combo' works this way. Pull the rod out of the dash, and the sleeve with the wire to the carb choke butterfly comes up, due the the placement of a pin, screw or cotter in the rod. The lower end of the sleeve is hauled up by that rigid cotter tugging it up as the rod comes out of the dash.

Relax the rod, and the spring on the carb butterfly pulls the sleeve and rod together, back to normal carb opening.

Dual actions.
Full choke, rod pulled out of dash, pulls up the sleeve, closes choke. NOTE: the rod has a square shaft lower end, that fits the square connector, allow the rod to twist and turn the needle valve, the rod isn't round there, as it could not twist the needle valve. And a universal joint is there to make the angle to the dash work the mechanics.

Amazing! What a concept. I never figured that out. Thank you so much Dan.
John

Rotate the dash knob (gently) to adjust fuel mixture. Pull the knob away from the dash to choke the engine for starting. The knob should return to its normal position automaticaly when pull is released.

Notice how the wire is bent just before it connects to the carburetor. I did mine the same way from a NOS original I have.

Original Smith wrote: ↑

Sun Jul 04, 2021 10:43 am

Notice how the wire is bent just before it connects to the carburetor. I did mine the same way from a NOS original I have.

The set up in question has the "wrong" carb. the throttle & choke levers are the long, early type.(20-23) Not really important, but do require a dog leg bent in the choke rod to clear the second front choke rod.
The factory? drawing shows an earlier(23-24-25?) short, but, straight choke arm also requiring a dog leg bend to clear the second choke rod.
The typical late carb has a dog leg built into one of the choke arms already to clear the second choke wire so the dog leg in the choke wire isnt necessary. Is that a post 25 change? Did they still use a dog leg choke rod on those later units? dont know. Maybe someone can answer that question.