Construction and other equipment

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HD3 revival

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=158700
Printed Date: 23 Aug 2025 at 1:21am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: HD3 revival

Posted By: smokechaser
Subject: HD3 revival
Date Posted: 03 Mar 2019 at 12:51pm

I've been working on a long neglected HD3 dozer, things where going well until I discovered the head was cracked between 3 and 4 exhaust valves. This allowed the inserts to fall out and then be hammered into the pistons. I would imagine this head is now junk, yes?

Replies:

Posted By: DMiller
Date Posted: 03 Mar 2019 at 3:44pm

Contact Chapin Cylinder Head Chapin IL, see if they think can be salvaged.

http://www.chapincylinderhead.com/" rel="nofollow - http://www.chapincylinderhead.com/

Posted By: nickia
Date Posted: 03 Mar 2019 at 5:41pm

try midwest cylinder nevada iowa they welded mine plus they had remans on the shelf for sale

Posted By: smokechaser
Date Posted: 03 Mar 2019 at 5:58pm

Thanks! I will look into both of those. In the meantime, I have a model 400 winch I would like to install. Does anyone have an exploded parts diagram they could post (or sell)? I know I am missing the intermediate drive shaft plus who knows what else.

Posted By: NomoreJohnDeere
Date Posted: 03 Mar 2019 at 9:45pm

Welcome

Love to see pics of that winch and the drive parts

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HD3

Posted By: smokechaser
Date Posted: 12 Apr 2019 at 11:29am

Update. I got my head back from the shop (Chapin), got it mostly back together and torqued to the block. When I realized that someone had previously installed the valve rotaters on the exhaust valves (they should be on the intakes). I was careful to put it back together the way it came apart and didnt notice until too late. Will this be a problem if not corrected or should I just not worry about it?