Farm Equipment - D 12 front oil seal

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D 12 front oil seal

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=212628
Printed Date: 27 Oct 2026 at 9:42pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: D 12 front oil seal

Posted By: 54f250
Subject: D 12 front oil seal
Date Posted: 27 Oct 2026 at 7:28pm

I am replacing the front main oil seal on my D 12. I have removed the radiator, pulley, etc to access the crankshaft. My question is, do I need to remove the timing cover or do I simply pull the seal and replace it? I have read the manuals but I am still unclear.

Thanks, Jim

Replies:

Posted By: steve(ill)
Date Posted: 27 Oct 2026 at 7:32pm

i have done a couple "B" tractors ( similar)... and i remove the cover to make it easier to get the seal out.. Also inspect the shaft to see if it is grooved.. Excess wear can cause a leak and they make a thin sleeve to cover the journal if needed..

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Like them all, but love the "B"s.