New guy from CA

First Post. Don't know much about heavy equipment. I'm in the Medical X-ray Business in Southern Calif. We have Property in southern Oregon so we bought a Melroe/Bobcat Loader (Model 500?) for $1000.00 in Oregon. I'm told the Kohler 20 engine is seized. I would appreciate any advise. I don't have the Model/spec/SN yet. I found opeengines.com and a site that re-powers Melroes with Vanguard engines.There are Pics in my album.http://www.mytractorforum.com/album.php?albumid=309
Also have a Drott TD92 Skidster Loader on a International Harvester Chassis. It has a 6cyl Diesel, 4 way bucket, and Ripper. Need to replace cracked right side drive gear housing and cover.
thanks
Larry Mitchell