Allis B and wc problems
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=211359
Printed Date: 18 Sep 2026 at 2:28am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Allis B and wc problems
Posted By: Ttague39B
Subject: Allis B and wc problems
Date Posted: 14 Jun 2026 at 5:58pm
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I have a 39 B and a 37 WC and bolth run and start great but once they get up to temp they start running funky and start wanting choke to run, they do it bolth under load and just idling but after about 5 minutes they will start running great without choke again, the B will try and die but at soon as you give it choke it kicks right back up and the WC will keep itself running but you can tell that its just the governor flipping it open and closed to keep it alive. Does anyone have any ideas? Bolth carbs have been rebuilt, the B has a new manifold gasket, professionally rebuilt mag and the head has been decked. Would maybe running lead substitute in the fuel help? Thanks.
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Replies:
Posted By: Hubert (Ga)engine7
Date Posted: 14 Jun 2026 at 6:41pm
Having to use the choke points to a fuel flow issue, maybe insufficient flow from the tank or float level adjustment problem. With the problem occurring after it warms up it could possibly be a condenser or coil breaking down but it is unlikely that you would have the same problem with both tractors. Do you have the fuel lines too close to the manifold? Valve adjustment is another thing to consider especially if both have been recently rebuilt. Try using mid grade gas and see if that helps any.
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Just an old country boy saved by the grace of God.
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Posted By: daveingreenbay
Date Posted: 14 Jun 2026 at 9:15pm
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Check the Magneto, It thats what uou have, It may be putting out a weak spark after it warms up
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