I helped a friend do a bearing repack a few days ago, and today he started seeing smoke coming from the wheel well, We tightened everything back up, and everything seemed fine. The center of the hub is the same temperature as the other side (which we did not repack yet) so i don't think the tightness of the preload is an issue, i am thinking its left over grease on the rotor, and am about to clean that off and see if thats the case. Any other ideas?