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-   -   1931 Tudor. Carburetor adjusting rod not turning (https://www.fordbarn.com/forum/showthread.php?t=209290)

Rob Rose 11-17-2016 05:52 PM

1931 Tudor. Carburetor adjusting rod not turning
 

I have had this car for two weeks and I am new to Model A's. Today the adjusting rod doesn't turn. Yesterday I was able to turn it clockwise to seat it and counter clockwise. The car starts and runs, but it seems like the mixture is rich. The choke operation in and out works fine.

Any suggestions?

Big hammer 11-17-2016 06:24 PM

Re: 1931 Tudor. Carburetor adjusting rod not turning
 

Under your hood where the rod attaches to the carb, there should be a sleeve over the joint with a spring pushing it down. Check parts suppliers online catalogs for pictures! :-)

Art Newland 11-17-2016 06:50 PM

Re: 1931 Tudor. Carburetor adjusting rod not turning
 

Sometimes the knob will strip out, knob turns the shaft doesn't...

Mitch//pa 11-17-2016 06:54 PM

Re: 1931 Tudor. Carburetor adjusting rod not turning
 

Actually on the repos the knob unscrews from the rod.... i usually locktite them on

Fred S 11-17-2016 08:21 PM

Re: 1931 Tudor. Carburetor adjusting rod not turning
 

Quote:

Originally Posted by Mitch//pa (Post 1386430)
Actually on the repos the knob unscrews from the rod.... i usually locktite them on

That happened to me when I first got my car. I thought I was adjusting the gas mixture, but I was only spinning a lose knob. I used Locktite also.

qstott 11-17-2016 09:01 PM

Re: 1931 Tudor. Carburetor adjusting rod not turning
 

Welcome to a fellow North Carolinian!

Rob Rose 11-17-2016 09:42 PM

Re: 1931 Tudor. Carburetor adjusting rod not turning
 

Hey! Beaufort here.

Rob Rose 11-17-2016 09:42 PM

Re: 1931 Tudor. Carburetor adjusting rod not turning
 

In my case the knob isn't turning at all.

tbirdtbird 11-17-2016 10:42 PM

Re: 1931 Tudor. Carburetor adjusting rod not turning
 

maybe overtightened?

Tom Wesenberg 11-18-2016 12:53 AM

Re: 1931 Tudor. Carburetor adjusting rod not turning
 

Quote:

Originally Posted by tbirdtbird (Post 1386546)
maybe overtightened?

I agree, that's what it sounds like. They should be very lightly turned closed, then opened to where it runs best.

If it's a repro knob, then I do the same as Mitch, Loctite it.

SeaSlugs 11-18-2016 01:17 AM

Re: 1931 Tudor. Carburetor adjusting rod not turning
 

I've always heard that its not a wind up toy, get the thing set where it runs good and leave it alone. Then only adjust for long hills or the difference between summer and winter. Theres no reason to turn it closed every time you park.

Chuck Sea/Tac 11-18-2016 01:36 AM

Re: 1931 Tudor. Carburetor adjusting rod not turning
 

Pull the rod in the engine compartment to take the sleeve off and separate the rod from the piece sticking out of the carb. Now you can verify what's stuck. If the rod in the carb is stuck,you could try penatrate like areo kroil ect, to help start the separation process.

Rob Rose 11-18-2016 07:40 AM

Re: 1931 Tudor. Carburetor adjusting rod not turning
 

this makes sense

Johns30 11-18-2016 08:08 AM

Re: 1931 Tudor. Carburetor adjusting rod not turning
 

The GAV on my '30 is really, really hard to turn. It is so tight that I swore it was fully closed all summer (while also trying to figure out why the car was running way too rich), but eventually I found out that it was still nearly a full turn open. I've had the whole thing apart twice down by the carb, and everything seems fine and turns easily when apart, but when it gets put back together I have to use a ridiculous amount of force to get it to turn inside the car. I still haven't figured it out. But, at least for now, I finally know where closed is and now I just kinda keep it about 1/4 open all the time so I don't need to mess with it much, and the car runs a lot better now. Eventually, it would be nice to figure out what's wrong with it (and I also don't want to break it by having to crank on it so hard).
Is there something inside this mechanism that should be lubricated to make it turn easier?

Jacksonlll 11-18-2016 08:37 AM

Re: 1931 Tudor. Carburetor adjusting rod not turning
 

Take it apart, really easy, and find out what makes it tick. There is not much in there. All you are doing is moving a needle valve in and out. Some pliers will help you figure it out.

100IH 11-18-2016 11:23 AM

Re: 1931 Tudor. Carburetor adjusting rod not turning
 

I have removed the GAV to take out the needle and apply a very light coating of anti-seize to the needle. Then work it in by turning while out of the carb body. Then back off the needle and re-install. Worked for me for years.

100IH 11-18-2016 11:30 AM

Re: 1931 Tudor. Carburetor adjusting rod not turning
 

I seem to remember long ago that I ran a die over needle threads to free up a fit that was too snug but sure don't remember the size and pitch description.

Tom Wesenberg 11-18-2016 11:58 AM

Re: 1931 Tudor. Carburetor adjusting rod not turning
 

Quote:

Originally Posted by 100IH (Post 1386723)
I seem to remember long ago that I ran a die over needle threads to free up a fit that was too snug but sure don't remember the size and pitch description.

Good point. I do seem to recall some of the repro parts had a poor thread fit. Might try another needle if you don't have the right die for the thread.

redmodelt 11-18-2016 01:25 PM

Re: 1931 Tudor. Carburetor adjusting rod not turning
 

Could it be one of the needles made some years back that the shank that the end of the housing pinched on that was too large and you needed to remove the ring on the housing so the needle could freely turn in the housing. Not recommending this because the ring keeps the needle from changing on its own but if it helps in this case.

Rob Rose 11-18-2016 05:58 PM

Re: 1931 Tudor. Carburetor adjusting rod not turning
 

I tried turning it hard counter clockwise and nothing. I think I will try 100IH suggestion tomorrow.


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