Farm Equipment - A-C B zenith carburetor

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A-C B zenith carburetor

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=135366
Printed Date: 16 Jul 2025 at 5:43pm
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Topic: A-C B zenith carburetor

Posted By: AC1945WC
Subject: A-C B zenith carburetor
Date Posted: 22 Feb 2017 at 4:01am

I just took the carb off my 1945 b cause it was acting funny and surging. It has been rebuilt using the new needle valve with the viton tip. These things are a pain cause they will swell with certain solvents and additives. Also it was put back together with hex head screws instead of the regular screws. Any idea if I can get the old completely metal needle valve and the original style screws and where could I get them if still available?

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AC1945WC

Replies:

Posted By: George Andreasen
Date Posted: 22 Feb 2017 at 6:14am

I can't speak for the brass valve, but the screws (bowl screws?) are ordinary machine screws and should be available at just about any good hardware store or auto parts house. They are a fillister head if I recall.

Do you have the "anti surge" spring between the throttle shaft and one of the manifold studs? Without it the engine will definitely surge while running.

Posted By: AC1945WC
Date Posted: 22 Feb 2017 at 8:21am

Yeah I do have the spring. It has been surging since I had gotten it running again after I purchased the tractor from the last owner. I took the carb apart and found the viton needle valve had swollen a bit restricting the fuel.

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AC1945WC