Farm Equipment - Crankshaft seal

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Crankshaft 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=159358
Printed Date: 24 Sep 2025 at 2:22am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Crankshaft seal

Posted By: TMiller/NC
Subject: Crankshaft seal
Date Posted: 26 Mar 2019 at 12:11pm

Need the crankshaft front and rear seal numbers or ID and OD for Allis Chalmers B with CE engine. Many thanks, Tim

Replies:

Posted By: CrestonM
Date Posted: 26 Mar 2019 at 12:26pm

In regards to the front: The early CE engines used a smaller OD seal than the later ones. I couldn’t find the smaller diameter seal for my engine, so I just used a Dremel and enlarged the hole in the timing cover, then used the larger seal that I got from DJ’s tractor parts.

Posted By: mdm1
Date Posted: 26 Mar 2019 at 12:29pm

I took the timing cover to napa and they ordered one to fit. Make sure you line up the cover and tighten it down before you put the seal in. I will be redoing mine!

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Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK!

Posted By: TMiller/NC
Date Posted: 26 Mar 2019 at 12:29pm

Thanks Creston, I haven't torn the engine down yet was going to gather some parts 1st.

Posted By: CrestonM
Date Posted: 26 Mar 2019 at 12:54pm

I did it a little different than what mdm1 said. I put the seal in the timing cover, then installed it, centered it, and tightened it down. I tried to eyeball it as best I could, and 4 years later, it's not leaking yet.

Posted By: TMiller/NC
Date Posted: 26 Mar 2019 at 1:07pm

Are speedy sleeves required these seals?

Posted By: CrestonM
Date Posted: 26 Mar 2019 at 1:15pm

Something is required, yes. Otherwise the spiral groove cut into the crankshaft will cause a leak.

I'm sure some folks will say what I did is "wrong", but instead of bothering with a Speedi Sleeve, I used some JB Weld to fill in the spiral, let it cure, then sanded/filed it down to be flush with the crankshaft snout. This method works, because the seal isn't riding on the JB Weld, but rather the crankshaft snout, which keeps the seal from wearing away at the JB Weld. 4 years have passed, no leaks yet.