3500 to 3700 engine swap help
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=161706
Printed Date: 09 Apr 2026 at 3:00pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 3500 to 3700 engine swap help
Posted By: Kevin210
Subject: 3500 to 3700 engine swap help
Date Posted: 07 Jun 2019 at 8:58pm
OK guys I was hoping the fan pulley and the alternator on the 3500
would interchange to the 3700 but it appears they won't.
There wasn't a fan or alternator on the 3700 when I got so I was
hoping things would swap.
So now I'm assuming I will need a fan and pulley and alternator
for the 3700 to line things up for the belts.
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Replies:
Posted By: tbran
Date Posted: 07 Jun 2019 at 9:18pm
Yes the belts are wider on the newer series engine rightly so they are needed. Your assumptions are correct.
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When told "it's not the money,it's the principle", remember, it's always the money..
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Posted By: Kevin210
Date Posted: 09 Jun 2019 at 8:16pm
Well today I did a lot of looking and figuring.
The exhaust manifold on the irrigation motor I bought is cracked in the middle section so I took the whole manifold off.
I have a manifold for a 7045 I think it is that I bought a long time ago so I could use a schwitzer turbo instead of the air research but that didn't pan out either so I used the 210 manifold and made an adapter piece to use the schwitzer turbo.
I used the manifold off the 210 engine which already had the schwitzer on it so I have the turbo on now and oil lines on which I also had to have made since the original oil lines would no longer work.
I still have to get an alternator that will line up and probably a fan and fan pulley also to get things right on the front.
Still have a lot to do but overall I think things are coming along ok.
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Posted By: Kevin210
Date Posted: 09 Jun 2019 at 8:22pm
OH yeah,might be helpful if someone with a 3700 engine could send me the number off of the alternator maybe make it easier for me to find one.
Thanks.
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Posted By: DrAllis
Date Posted: 10 Jun 2019 at 6:55am
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3700 engine or not, the alternator is configured to the chassis the engine is installed in.
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