Power Unit ID?
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=206367
Printed Date: 19 Jul 2025 at 6:29pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Power Unit ID?
Posted By: BullHeaded
Subject: Power Unit ID?
Date Posted: 20 Apr 2025 at 6:45am
Can anyone help me with a positive ID on this old Allis Power Unit?
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Replies:
Posted By: BullHeaded
Date Posted: 20 Apr 2025 at 6:47am
here is the only tag on the unit.
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Posted By: Dave (Mid-MI)
Date Posted: 20 Apr 2025 at 8:15am
| Looks like a model U power unit. Same 318 ci engine used in the UC tractor and I believe the M crawler. |
Posted By: steve(ill)
Date Posted: 20 Apr 2025 at 8:17am
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that would be a good guess.... Look at that MAG... WOW !... a golden oldie.. not me--- internet search..  ------------- Like them all, but love the "B"s. |
Posted By: BullHeaded
Date Posted: 20 Apr 2025 at 9:17am
| Thanx guys! I’ll find out if its a runner in the next couple of days. Plan to put it to work on a sawmill. Hoping a lot of work can get done at 4 gallons per hour at 1200 load/rpm’s. |
Posted By: HudCo
Date Posted: 20 Apr 2025 at 9:59am
| i just took a tall wd45 head off a wd that had a mag like that, thats the first one iever seen like that. i think the tractor whent to scrap last saturday |
Posted By: Les Kerf
Date Posted: 20 Apr 2025 at 10:41am
Pictures please!
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BullHeaded wrote:Posted By: BullHeaded
Date Posted: 20 Apr 2025 at 2:44pm
| Off to a good start! It has excellent hot spark. |
Posted By: SteveM C/IL
Date Posted: 20 Apr 2025 at 4:02pm
| Same as my UC except that one has the generator on the mag drive. Mine is 34 and has no electronics so didn't need a genny. |
Posted By: Leon B MO
Date Posted: 20 Apr 2025 at 7:05pm
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From 1929 to 1936 the U, UC and M engine had a 300 cubic inch displacement. Midway through 1936 the bore was increased from 4 and 3/8 to 4 and 1/2 making it a 318 cubic inch displacement. The hp rating was not retested. I have a 37 UC and a 37 U. If you hook that motor up to a sawmill and make it work hard it really does have a unique sound. Years ago I bought a power unit that ran an irrigation pump from OK tractor in Oklahoma, it even had the low oil pressure shut down switch on it and a twin disc clutch, electric start. That motor went into the 37 UC that I still have. Believe it or not they made the UC version of the transmission and engine up until 1954 for the Thompson conversions. The rear shroud supports looks nothing like the U power unit in Norms book on page 193. Makes me think your unit may have been built later on in line with the Thompson conversion line. Just a thought. Post a video if you get it on the mill working. Leon B Mo ------------- Uncle always said "Fill the back of the shovel and the front will take care of itself". |