If you just got these three tractors and started restoring them, I would have expected that. They were probably sitting in a field for years. The crankshaft sits higher than oil line in the sump. Condensation occures and that will bring some rust. The rust is from the shaft journal, however, as opposed to the bearing which isn't ferrious. While I did rebuild some old tractors before joining the service, it was in the Navy that I realized the difference between the babbit alloys used all those years ago and bearings of today. Them old bearings are not that resistant to pitting and deterioration. I think if you are restoring them as you get them, you are doing fine to go over them. I would do likewise. May I speak frankly? I don't buy tractors in great shape. I usually grab them cheap, as long as they didn't throw a rod or something, I'ld prefer to restore what is bad on a tractor that I didn't pay much for, and know what the workings are like, then buy one that someone says is great, that may even start and run, FOR NOW, and pay far more. I'll likely have take the engine down and restore it anyway, so I'm better off not paying so much upfront. My wife and I had debate over this recently. She was trying to tell me that If I paid a little more for the tractor upfront, I would be able to save money in repairs, but, I find that when I buy an older tractor, no matter how much I pay, I'll probably have to take the engine down, and replace the clutch, radiator, rear tires and do a 12v conversion, anyway. I probably not say so much, except my wife things that more expensive tractors are not subject to wear and tear, like less expensive tractors. At anyrate, how are the shafts looking that these bearings were supporting?