G Carb Question
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=161774
Printed Date: 22 Aug 2025 at 7:38am Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: G Carb Question
Posted By: tmays
Subject: G Carb Question
Date Posted: 09 Jun 2019 at 8:50pm
Main jet threads in Carb body are stripped(not by me, I might add). Can it be helicoiled? Doesn’t look like much there. And threads are nonexistent. Thanks
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Replies:
Posted By: JoeM(GA)
Date Posted: 09 Jun 2019 at 9:02pm
might be interesting finding an insert with the correct thread, you might check with Steve at B&B for ideas, sure he's dealt with similar
https://www.bb-customcircuits.com/" rel="nofollow - https://www.bb-customcircuits.com/
------------- Allis Express North Georgia 41 WC,48 UC Cane,7-G's, Ford 345C TLB
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Posted By: tmays
Date Posted: 09 Jun 2019 at 9:37pm
Thanks, Joe! Sent him an email. In the meantime, if anyone knows of a solution, I’d appreciate it
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Posted By: JoeM(GA)
Date Posted: 09 Jun 2019 at 10:29pm
I wonder if some JB weld or the like would hold it?
------------- Allis Express North Georgia 41 WC,48 UC Cane,7-G's, Ford 345C TLB
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Posted By: Gerald J.
Date Posted: 10 Jun 2019 at 9:17am
It needs the threads to allow adjustment of the mixture.
There might be some carburetor repair hints in the operator manual or the shop manual: http://geraldj.networkiowa.com/Trees/Allis%20Chalmers%20G%20Owners%20Manual%20%28TM-4A%290001.pdf" rel="nofollow - http://geraldj.networkiowa.com/Trees/Allis%20Chalmers%20G%20Owners%20Manual%20(TM-4A)0001.pdf
http://geraldj.networkiowa.com/Trees/Allis-Chalmers-G-B-C-CA-Service.pdf" rel="nofollow - http://geraldj.networkiowa.com/Trees/Allis-Chalmers-G-B-C-CA-Service.pdf
Gerald J.
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Posted By: Dick L
Date Posted: 10 Jun 2019 at 11:21am
I would try the JB Weld! If there is any slight threads still there red Loctite should hold it as well. It would be easier to work with in the smaller area than JB Weld. There wouldn't be enough vacuum to dislodge it. It just has to seal to any bypass.
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Posted By: tmays
Date Posted: 10 Jun 2019 at 12:53pm
There are zero threads left. Slick. Bought the tractor from a young feller and the tractor belonged to his great grandad. It has seen its better days. Did not have block and head. But did have several parts that attach to engine. The main jet was held in by a pipe strap attached to two Carb bowl screws with a bolt screwed through the strap to put pressure on the main jet. And from the looks of tractor, been sitting in LA weather since great granddad quit using it. Lot of parts I can use on another G I have, however. Thanks
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Posted By: Dick L
Date Posted: 11 Jun 2019 at 6:09am
The main jet in this carburetor is actually an orifice. To make an orifice that would work with a larger outside diameter you need to have the correct size hole and the exact length of the hole or land length. The taper on the back side is also important. The front does not have to be exact being a non adjustable jet or orifice. If you get a slip press fit the red Loctite would hold it in place.
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Posted By: Fred in Pa
Date Posted: 11 Jun 2019 at 8:01am
If it is a running tractor ,buy a good used carb and rebuild it .
------------- He who dies with the most toys is, nonetheless ,still dead. If all else fails ,Read all that is PRINTED.
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Posted By: Dick L
Date Posted: 11 Jun 2019 at 11:30am
I would do that myself Fred now. When in my twenties I had to save back my coffee break money to buy a can of Permatex. I had to learn how to repair and use what others threw away. I assume that some might be in that position now.
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Posted By: Fred in Pa
Date Posted: 11 Jun 2019 at 12:45pm
Only answering the mans ? , see no disrespect in answer . When you are in business patching things that might not work dose not buy coffee .
------------- He who dies with the most toys is, nonetheless ,still dead. If all else fails ,Read all that is PRINTED.
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Posted By: Fred in Pa
Date Posted: 11 Jun 2019 at 4:26pm
  I am rebuilding a G engine right now for a customer ,just took carb apart to rebuild it .Thought I would post this so everyone can what he asking .
------------- He who dies with the most toys is, nonetheless ,still dead. If all else fails ,Read all that is PRINTED.
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Posted By: tmays
Date Posted: 11 Jun 2019 at 5:56pm
Fellers I appreciate all the comments. Tractor doesn’t have an engine. Trying to repair the Carb because I would hate to see it go to waste. Will consider all suggestions and then decide what I will do. Thanks!
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Posted By: Dick L
Date Posted: 11 Jun 2019 at 6:44pm
Fred in Pa wrote:
  I am rebuilding a G engine right now for a customer ,just took carb apart to rebuild it .Thought I would post this so everyone can what he asking . |
I have a couple G carburetors out in the parts that will most likely never get checked or repaired if they need any repair. Been there ten or fifteen years! Probly still be there for the estate sale. Machining mold repair parts this week along with welding up a new walker frame. I can do that from my chair. Gonna have to hire help to put a new clutch in the 5020 though. Gripes my rear that I am not strong enough anymore.
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Posted By: GoAskAllis
Date Posted: 03 Aug 2019 at 1:56pm
I just this morning fixed one of those (same carb used on MH Pony). I own Grand Valley Tractor...discount tractor parts with full machine shop attached. I designed a solution, then machined it. I just finished the leak test 20 minutes before seeing your post. You can find our phone # on the internet.
------------- Tim Grand Valley Tractor '41 John Deere LA, '42 Ford 2N, '48 Oliver 60 Standard, '49 Allis Chalmers G, '49 Farmall Cub, '53 Ford Jubilee, '60 (?) Frankentractor
http://www.grandvalleytractor.com/
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Posted By: Steve in NJ
Date Posted: 05 Aug 2019 at 4:14pm
I was actually successful on most of those TSV13 missing thread Carbs. I've used thread restorer in order to repair them. The cast aluminum is such crap, that it rots terribly making things tough to repair. Fred is correct. If the thread restorer doesn't work, time to purchase a good parts Carb and rebuild it. Even the float bowl floors get rot holes in them on those particular Carbs. I've poured new epoxy floors in some customers Carbs making it like new again. Time is money though! The pic that Fred posted looks like a nice Carb to rebuild. Even the jet is super nice and not all screwed up from somebody not using the correct tool to remove the jet. Man, how many of those have I seen! Sheesh, makes it a project for me getting them out when somebody else was in there not knowing what their doing..... LOL!
Steve@B&B
------------- 39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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