Farm Equipment - B piston rings

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B piston rings

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=178370
Printed Date: 29 Aug 2025 at 8:41am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: B piston rings

Posted By: OldEvo
Subject: B piston rings
Date Posted: 15 Feb 2021 at 5:26pm

Today I installed the rings I bought 5 years ago for my '48 B. With a measured bore of .379 I have an end gap of over .035. Does someone make rings for a small overbore that I could file to fit?

Thanks

Replies:

Posted By: steve(ill)
Date Posted: 15 Feb 2021 at 7:15pm

your original bore was 3.375 inch so you are looking for rings that fit 3.385 ( or .010 over) that you can file.... Im not sure there are rings listed for "ALLIS" as most people will bore to the 3-7/16 oversize with new pistons and rings..... There are other engines that have 3.385 inch bore rings if you want to check them out... also note some are cast, some are chrome, some are 1/8 thick , some a 3/32 inch thick..... GOOD LUCK.

https://www.dlastore.com/e_store/compression-piston-ring-85-98-x-3-17-mm-3-385-x-0-125-in.html" rel="nofollow - https://www.dlastore.com/e_store/compression-piston-ring-85-98-x-3-17-mm-3-385-x-0-125-in.html

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

Posted By: steve(ill)
Date Posted: 15 Feb 2021 at 7:24pm

put a standard ring in the bore 1/4 inch down from the top and measure end gap... then push it down 2 inches and measure again.. If the bore is tapered, you might PINCH the ring at the bottom when it fits good at the top... That can be a problem.. You can HONE the cylinder to get the bottom a little bigger if you really want to go this way.. Use a proper hone to get straight cut.

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