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344 rear main seal

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=118542
Printed Date: 04 Nov 2025 at 8:17am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 344 rear main seal

Posted By: south ks
Subject: 344 rear main seal
Date Posted: 04 Feb 2016 at 6:11am

Hi, I'm in the process of installing a 7000 military engine in my hd6g! I am wondering if anyone has the number for the rear main seal for the original 344 engine and flywheel? The outer diameter of the seal is approximately 6 5/8 inches and the inner diameter is approximately 5 1/2 inches! Thanks

Replies:

Posted By: Dozer
Date Posted: 04 Feb 2016 at 7:08am

Chicago Rawhide 53701 It is a discontinued seal size. I found the last one on the internet Good lick

Posted By: Dozer
Date Posted: 04 Feb 2016 at 7:13am

There is one on eBay right now for $12.99

Posted By: south ks
Date Posted: 04 Feb 2016 at 4:38pm

Thank you very much! My flywheel had a sleeve on it, so it measured 5 1/2 inches. So I might remove the sleeve and see what it looks like, and go from there!

Posted By: Chock2
Date Posted: 10 Feb 2016 at 9:15pm

A good source of information is the Timken / National Seal catalog. It is available online and lists all of the dimensions of their seals. The catalog is file 7707.pdf and it is 701 pages so find the seal by dimension then get the National number. I have had very good luck finding seals for my HD6G and other old farm equipment (Gleaner combine). While you are on the timken site, the bearing catalog is a good download also