D21 Engine Kits?
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=25368
Printed Date: 25 Feb 2025 at 3:07am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: D21 Engine Kits?
Posted By: T16
Subject: D21 Engine Kits?
Date Posted: 07 Feb 2011 at 8:57am
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Fixing up an old D21 series one and need to pruchase a Overhaul kit for the 3400 series 426 cu in motor. What do you recommend and why? How much?
Thanks!
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Replies:
Posted By: Hunter
Date Posted: 07 Feb 2011 at 2:26pm
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i would recommend ordering the kit from a dealer that sells ac parts or if u know what size pistons sleves and rings u need u could get them from any place that sells them. it would probably run for about 900 to 1000 dollars if u are lucky maybe 800 but things are always more expensive online so dont order them from a website unless u really have to.
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Posted By: T16
Date Posted: 07 Feb 2011 at 5:20pm
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Unfortunately, I'm not blessed with that great of a local dealer. But I do appreciate your reply.
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Posted By: Hunter
Date Posted: 07 Feb 2011 at 5:32pm
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yup how close is the nearest dealer
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Posted By: Hurst
Date Posted: 07 Feb 2011 at 5:41pm
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The high compression kits really can do wonders for the 426s and 301s. I think Herschel Adams is the company that still makes the M&W designed kit, but PowerMax makes a high compression kit, but at least for my 301 kit, they use a standard upper ring, where the M&W kit I believe uses an L-shaped ring to help boost cranking compression at those lower speeds. All the parts for my 301 from Power Max were of name brand except the pistons and sleeves, which they told me were made in their factory here in the US (forget which state). Good luck!
Hurst
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1979 Allis Chalmers 7000
5800 Hours
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Posted By: injpumpEd
Date Posted: 07 Feb 2011 at 7:11pm
where you located? I have a very good local Agco Heritage parts dealer here, and he also deals in Howard Enterprises, as well as others. The 3400 kit will end up being the same as a 3500, I doubt anyone still makes the early style na pistons, if there was ever a difference. pm me if you want his contact info. Ed.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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Posted By: T16
Date Posted: 08 Feb 2011 at 8:58am
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I'm in North Dakota. Thanks for the info.
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