Hi Mathias,
Maybe these guys can help you,
http://www.allischalmers.com/
Or place an ad in "Traktor-Magasin för jordnära entusiaster.
Is that picture taken in Smaland?
( can't find the "a" with the "o" on top)
Nice crawler by the way...
Greetings from the Netherlands.
PS Could you go and say HI to my brother in Hult? Eksjö Kommun.
Edit: Just went through my archive and found in an old issue of
"Old Tractor" that the Model U and M were fitted with the UM-engine.
This engine has a 4-3/8 in. bore and a 5 in. stroke.
28 drawbar horsepower and very reliable,it says here.
You could also backorder "Old Tractor" issue March 2004.
That contains a special on the AC model M crawler.
http://www.oldtractor.co.uk/cgi-bin/pur ... =2004&s=bi