Construction and other equipment

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Big Al in semis

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=43285
Printed Date: 23 Jun 2025 at 12:52pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Big Al in semis

Posted By: DougG
Subject: Big Al in semis
Date Posted: 05 Jan 2012 at 6:57pm

I want to get one of these engines in a truck !!! Anyone know of a fella from Wisconsin who is working on some of these ? I have a couple leads on complete trucks but they arent for sale - yet - and in the backwoods ; I have a complete White \ Freightshaker with a blown Detroit - its a decent truck yet and would luv to put a 25000 model engine in it ; any info or parts for sale etc !!!

Replies:

Posted By: ctbowles58
Date Posted: 05 Jan 2012 at 9:27pm

there ts a big truck junk yard in Parryville Mo.90+ ackers of trucks you may check there.

Posted By: Orange Blood
Date Posted: 05 Jan 2012 at 10:45pm

Doug, I am by no means an expert on the Big Al engines, but have been doing some homework for a little project of my own. I think the Big Al version of the 21000/25000, was really no different than the power unit 21000/25000 engine, except for air compressor, and pump settings, you can find 21000/25000 model engines now and then, a whole lot easier than an actual purple people eater.

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Still in use:
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Posted By: Calvin Schmidt
Date Posted: 06 Jan 2012 at 3:09pm

Darryl (WA) and I had a 900 hr. 25000 MK II engine for sale on here for a year. Sold it about a month ago. It was the latest version with all the updates of 6-138. Would have been great in a truck!!

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Nothing is impossible if it is properly financed

Posted By: Mactractor
Date Posted: 06 Jan 2012 at 5:54pm

I`ve been trying to get info on these installations for a while. Read some horror stories where late model 25000 and 6138s broke or destroyed the Jap made late model 6 counterweight crankshafts. Engines with the old 12 counterweight cranks (which I`m told go back as far as the ol Buda 844) seem to have no crankshaft problems. Back on page 10 of this section, there is a good line of discussion on truck engines initiated by member `big al`. Mac

Posted By: DougG
Date Posted: 06 Jan 2012 at 7:42pm

I dont plan on finding a true Big Al , but a 21000 or 25000 used construction motor - its gonna be a project !!