Allis Chalmers U Hoods
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=124845
Printed Date: 19 Jul 2025 at 10:08am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Allis Chalmers U Hoods
Posted By: 51ACWD
Subject: Allis Chalmers U Hoods
Date Posted: 21 Jun 2016 at 7:32am
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Hey everyone. I had a question regarding the hoods/ exhaust placement on the U. I've seen many with the side exhaust, and I've seen some with both holes in the hood where the breather and exhaust run through. My particular tractor is a 1936 and is done this way. Was there a switch in the years when the U started doing this?
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Replies:
Posted By: CAL(KS)
Date Posted: 21 Jun 2016 at 9:16am
according to the parts book, the front dump exhaust or through the hood was used on engine #'s prior to UMA-10090. the front exit was for gasoline and the center exit for for heating low grade fuels. two different manifolds used. an early style then changed at UMA 1386 up to the change to center only at 10090. I cant say what that corresponds in years. i have the later style but need to check my engine #
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Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20
Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15
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Posted By: 51ACWD
Date Posted: 21 Jun 2016 at 9:30am
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I do know that this is a dual fuel tractor. I wonder if it's similar to the unstyled Wc. When burning kerosene you have to swap the exhaust plates out. And visa versa. I wonder if it's the same for the u. If burning gasoline to use the front dump and kerosene to use the side
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Posted By: Gary(WI)
Date Posted: 21 Jun 2016 at 9:38am
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I believe you are right The front exhaust is for gas and the center for kerosene The center directs all exhaust gases out around the intake tube to preheat the fuel
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Posted By: 51ACWD
Date Posted: 21 Jun 2016 at 9:42am
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I'm not positive on that though. I just know that the manifold on mine is set up to go through the hood and also has the starting tank spot to the side. I see a lot of restored I'd with the side exhaust and no place through the hood to run a pipe through it. Maybe this was strictly a dual fuel thing.
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Posted By: CAL(KS)
Date Posted: 21 Jun 2016 at 10:10am
the later ones didnt have hole in hood because the manifold has a chamber you flip to heat low grade fuels. My U is this way has kero engine # and low comp pistons with center dump manifold. its a 37
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Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20
Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15
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Posted By: 51ACWD
Date Posted: 21 Jun 2016 at 11:51am
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Hmm. I wonder if there is a way to see what engine #'s correspond with years. Mine is a 36 with the 5.2l engine with both exits on the manifold. Just curious really
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Posted By: 51ACWD
Date Posted: 21 Jun 2016 at 7:37pm
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What would engine # UM or UMA 7601G denote as?
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Posted By: 51ACWD
Date Posted: 22 Jun 2016 at 9:37pm
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Would a g code engine on a 1936 have a hood with the spots for a starting fuel tank? G I know is for gasoline. I guess it's not a dual fuel?
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Posted By: everett048
Date Posted: 23 Jun 2016 at 1:41am
Hoods were also changed when the air filters changed from vortex to Donaldson.
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