I recently purchased a non operating L285 tractor from a online auction. The guy I bought it from said a valve had dropped and locked the motor up. I get the tractor home and and pull the valve cover and everything was fine, I pull the oil pan next to check for any bent rods and so on, everything looked great. So I assume the previous owner probably ran the tractor out of oil and smoked the main bearings. I continue on by splitting the motor from the tranny preparing myself for a complete rebuild because this thing is locked up smoking tight. Just as soon as I am able to see into the bellhousing I see a bunch gnarled metal and ball bearings, I immediately think the throw out bearing had fallen apart. But to my surprise the throw out looked brand spanking new along with pressure plate. "someone had been in here before" and didnt remove the debris when the repair was made and one of those ball bearings had wedged itself between the flywheel and bellhousing. I had to use a angle grinder to cut the bearing out. Once the ball bearing was out of the way the motor is free spinning. I've never seen or heard of this happening and I hope this story helps someone whoever comes across a stuck motor.