Farm Equipment - Allis b "soft seizes" but not overheating?

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Allis b "soft seizes" but not overheating?

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=212631
Printed Date: 28 Oct 2026 at 1:40am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Allis b "soft seizes" but not overheating?

Posted By: Pengineer
Subject: Allis b "soft seizes" but not overheating?
Date Posted: 27 Oct 2026 at 10:14pm

Brand new member, my 1st tractor, a 40s era model b with front end loader. I finally got the seized engine broken loose and running well but periodically it tries to seize up while running. It stalls the engine and sometimes is hard to turn over but after a few minutes starts and runs well again. I'm reading good oil pressure and cool engine temp. I've had the head off numerous times and tried to blow out all the oil and coolant passages.. Any ideas for me??

Replies:

Posted By: SteveM C/IL
Date Posted: 27 Oct 2026 at 10:45pm

I would bet you have corrosion on outsides of piston that takes up wall clearance. You said it "was" stuck. Unstuck and clean are two different things. Pull the head again and knock the pistons out to ensure all is well. Bet you find your answer.

Posted By: john2189
Date Posted: 28 Oct 2026 at 12:16am

My B would do that, i cleaned the cooling system many times I found out that the thermostat was broken and blocking the passage.

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'41 Allis B
'49 Farmall Cub