B front main seal off BUT
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=149263
Printed Date: 15 Dec 2024 at 2:32am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: B front main seal off BUT
Posted By: archangel_cpj
Subject: B front main seal off BUT
Date Posted: 07 Apr 2018 at 6:21pm
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The seal had been replaced once it looks like so no clue why the modern seal failed... why is the shaft not smooth??? On a plus the pulle came off 8n my hand LOL 
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Replies:
Posted By: CrestonM
Date Posted: 07 Apr 2018 at 6:35pm
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From the factory these tractors had a seal that I believe was several thin pieces of cork sandwiched together, at least that's what mine was. The cork kinda just slows the leak rather than completely seal it, so the spiral you see is meant to push the oil back into the motor when it's running. That will not work with a new modern rubber lip seal. My B was an earlier model and used a smaller diameter seal, so I used a Dremel tool to bore the hole out a bit bigger for a modern seal. What I did to fix the groove was make it all nice and clean, fill it with JB weld, let it cure, then file/sand it down until it was smooth. Allis B/C/CA expert Dick Lemmons here on the forum advised me that, and while I was doubtful at first, it worked great and has been leak-free for almost 2 years. Since the seal rides on the metal crankshaft, it won't wear down the JB Weld.
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Posted By: Gerald J.
Date Posted: 07 Apr 2018 at 7:56pm
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Posted By: steve(ill)
Date Posted: 07 Apr 2018 at 8:35pm
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wire brush all the paint off... and sand the surface with sand paper then wipe off with acetone prior to installing the JB weld into the groove.. then sand down smooth. ------------- Like them all, but love the "B"s. |
Posted By: CrestonM
Date Posted: 07 Apr 2018 at 8:39pm
| Also, if you'll take a small pick and clean out the groove that way, it will help remove anything the acetone doesn't get out. After 70 years, there could be some stuck-in stuff. |
Posted By: archangel_cpj
Date Posted: 07 Apr 2018 at 9:28pm
| THANKS my dad is in fiberglass so acetone is easy.. I thought that was the groove but wanted to make sure.. I can't believe that pulley came right off... |
Posted By: CrestonM
Date Posted: 08 Apr 2018 at 12:13am
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You might check your crankshaft key and make sure it is alright, or even go ahead and replace it anyway. Mine came off really easily as well. Turned out my half-moon key was shot. It was so worn, that if it went much longer it would probably have sheared the rest of the way off. |
Posted By: archangel_cpj
Date Posted: 08 Apr 2018 at 8:42am
| Yep its shot gonna add a new one any idea on size or do I wing it |