So I am rebuilding a 1990’s era machine that has 4 electric motors. I want to break down the motors, clean them and install new bearings. The motors are 3 phase so not much to them. The machine did get rained on tor several hours transporting it back to my shop. So it has a lot of rust. This is my first time reworking an electric motor. I have rebuilt many machines but never did the motors myself. I am fully competent wrt bearing replacement. My question to you guys is, what else should I look for or do to the motors while I have them apart? They all run fine so the windings seem ok. That is something I know would be best done by an electric motor shop. Assuming the windings are good, what else do you guys suggest I do while replacing the bearings?