Farm Equipment - a heads up when buying carb kit

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a heads up when buying carb kit

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=209746
Printed Date: 22 Mar 2026 at 1:00am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: a heads up when buying carb kit

Posted By: J&J
Subject: a heads up when buying carb kit
Date Posted: 17 Jan 2026 at 11:06am

I bought a carburetor kit with a new needle and seat for a Marvel-Schebler TSX-470. The seat would only thread on about a half a turn and then tighten up so much to where it was becoming destroyed, the old one threaded on easily. The thread dimensions were correct but the thread length was .008" too long. If you run into this take a fine file and gently file down the length of the threads. It threaded on easily after that. Don't force it or you'll run into big trouble. The Quality of these kit's are getting worse and worse.

Replies:

Posted By: DrAllis
Date Posted: 17 Jan 2026 at 2:47pm

A brand name of this kit, or where/who you bought it from would be helpful. It may have been one and only one seat that was bad. But, there may be dozens of them out there bad.....

Posted By: PaulB
Date Posted: 17 Jan 2026 at 3:24pm

That's what we get with so many things that are made in countries that use metric measuring, something always gets messed up in the conversion to inches. Thanks to overpriced union labor most everything is made in some third-world country now where quality control isn't important

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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY

Posted By: PeteMN
Date Posted: 21 Jan 2026 at 1:29am

The thing about that union labor....most likely had some over-paid mgmt stooge that couldn't even sharpen a pencil standing there with a stop watch complaining about worker taking time to check the threads and other dimensions, etc.

Posted By: DonDittmar
Date Posted: 21 Jan 2026 at 11:25am

Anymore carb parts are like ignition parts-made in China and hot or miss on quality. I rebuilt the engine in a MF 2135 industrial tractor for a guy about 2 years ago. Took 2 needle/seats and 3 floats before I got a combo that worked.

Same guy-skip over to an Oliver HD46. 3 cylinder Hercules. Went through numerous sets of points.

Mags, carbs, distributors, points and condensers are all antique technology that no one uses anymore and none of that stuff is made in the U.S.

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Experience is a fancy name for past mistakes. "Great moments are born from great opportunity"

1968 D15D,1962 D19D
Also 1965 Cub Loboy and 1958 JD 720 Diesel Pony Start

Posted By: Steve in NJ
Date Posted: 22 Jan 2026 at 8:35pm

When I come across that problem, it's not always the brass seat. In most cases, there is a left over piece of brass from the old seat which once cranked out stays in the threads. It's so minute, that ya can't see it. You go to crank in the new seat and the brakes come on pretty quick. I usually run an 1/8 NPT pipe tap down the threads and clean any debris left behind from the old seat. The tap also straightens any threads that may be a little wonky. I normally use a bore brush for cleaning threads in Carbs, but once in a while you come across that tight one. Then out comes the tap. The new seat screws right in with your fingers and you just snug it with your wide blade screwdriver. I use a GM brake adjusting tool to snug them down. The tool fits perfect in those seat slots.... HTH

Steve@B&B

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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife

Posted By: IBWD MIke
Date Posted: 23 Jan 2026 at 7:04am

This might be relevant to the discussion. https://youtu.be/BYBtaEJ0MRw?si=nFUpFj6Hsye1JREQ" rel="nofollow - https://youtu.be/BYBtaEJ0MRw?si=nFUpFj6Hsye1JREQ

Evan posts here once in a while, he does great work.