Farm Equipment - 3500-3700 engine swap project.

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3500-3700 engine swap project.

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=156092
Printed Date: 05 Apr 2026 at 12:53pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 3500-3700 engine swap project.

Posted By: Kevin210
Subject: 3500-3700 engine swap project.
Date Posted: 02 Dec 2018 at 5:32pm

Got a question about the inner cooler.On the tube where it slides inside the back of the water pump I was told there are two O-rings that go on the tube where it slides in,i put one in that groove but i'm stumped as to how or where the second o-ring goes.I wish I knew how to get pictures on here but only know how to take cell phone pics and seem them to another cell phone.I'm doing the same engine swap that Calvin did on his 220 with my 210.

Replies:

Posted By: DrAllis
Date Posted: 02 Dec 2018 at 6:54pm

I remember older engines having two and later ones maybe going to only one.

Posted By: Kevin210
Date Posted: 02 Dec 2018 at 8:26pm

So i'm assuming then that either way there is just a groove or recess for the o-ring,either one or two.

Thanks Doc.

Posted By: DrAllis
Date Posted: 02 Dec 2018 at 8:30pm

Groove(s) inside the water pump rear housing, yes.

Posted By: injpumpEd
Date Posted: 03 Dec 2018 at 7:29am

The N6 water volute/intercooler I put on my 7040 only had one oring groove.

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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!

Posted By: Kevin210
Date Posted: 03 Dec 2018 at 6:10pm

Thanks a bunch guys.I was just lost there.