Replacement throttle shaft
 

How do you attach the throttle arm to a new replacement throttle shaft? Looks like they’re peened over but how do you do it without destroying the shaft?

Re: Replacement throttle shaft
 

The ends are spring loaded. I grab the rods and the shafts with pliers and pull on the ends to remove them. It is possible that someone has buggered the ends so much that this won't work.

Re: Replacement throttle shaft
 

Bratton's online catalogue shows the arm already attached to the shaft.
https://www.brattons.com/searchprods.asp

Re: Replacement throttle shaft
 

Probably the best way is to make a jig to hold the throttle shaft while you peen the arm. I suppose you could also assemble it into the carb and use that as the jig.

Re: Replacement throttle shaft
 

Peening the arm on the new shaft without distorting the shaft itself where the slot is can be difficult if it's not supported somehow. Perhaps installing it into the carb and attaching the throttle plate would give it the needed support to prevent it from bending out of shape while it is being peened.

Re: Replacement throttle shaft
 

Maybe drill out a nut to the size of the shaft then cut the nut in half, use the two pieces
to clamp the shaft in a vise.

Re: Replacement throttle shaft
 

Good idea but IMO, there is no need to cut it in half. Cutting a slot in it (cut it half way through) would work just as well and make it easier to set up in the vice.

Re: Replacement throttle shaft
 

Re: Replacement throttle shaft
 

Or buy the completed assembly to get away from any shaft wear?


Joe K

Re: Replacement throttle shaft
 

I like that, will not keep dropping the nut halves.

Re: Replacement throttle shaft
 

Never done a new shaft but have fixed some loose ones. I didn't peen any of them but silver soldered them up.

Re: Replacement throttle shaft
 

I would use the one with the arm already on for a driver, but if you need to keep the correct arm for judging, just replacing the shaft would be the way to go. The carbs I have rebuilt were not for show cars, so was not an issue.
If the hole in the carb body is worn but not too bad, pretty sure you can get the assembly with oversized shaft or re-bush the hole as needed if you can.

Re: Replacement throttle shaft
 

Thanks for all the suggestions I tried them, but I found that just using wood blocks in my voice and placing the butterfly into the slot so the slot wouldn’t collapse with clamping pressure.

Re: Replacement throttle shaft
 

FWI, thin walled brass tubing to use for sleeving the carburetor body can be found at most hobby shops.

Re: Replacement throttle shaft
 

I like the wood block idea. Simple. Guess you could drop the shaft farther down to give maximum support to the shaft.

Re: Replacement throttle shaft
 

Good job. I love that feeling of achievement I get when I finally get a job done, especially when it isn't straight forward. I bet you are feeling that now.

Re: Replacement throttle shaft
 

LEM,
You do our hobby proud! Well done.

Re: Replacement throttle shaft
 

if need a replacement I have many parts for carbs, Just across the water from you! Let me know. Gary.

Re: Replacement throttle shaft
 

I did have the shaft down further in the voice while I was peening, but I raised it up just for the picture. And yes I do feel good that I came out not too bad. Thanks again for everyone’s input.