Quote Originally Posted by David T View Post
Finished assembling the alternator and installed it. My advice for anyone attempting to rebuild either the Motorola or the Ducy is, it is not worth it. Even when working perfectly they are marginal at best (the Ducy even more so). The Delorean vendors don't have parts and encourage outright replacement with something more modern and powerful. Good advice. Easily done with minor to no modifications necessary. The only good reason to keep the original alternator is for originality if that means anything. For the record the Motorola is a 9AR. The front bearing is a 6203 and the rear is a 6200. The suffices are for the seals in the bearings and they really don't matter much in this application. The brushholder and the regulator is generic and available. If the rotor or the stator or the diode bridge is bad it doesn't pay to rebuild. I spent about $20 for the two bearings and the brushholder. The assembly and disassembly were pretty as described in the video. A replacement alternator is over $200 but you do get a better alternator.
Bearings seals do matter. They keep out dust (there is large amount of air being pulled through the alternator with accompanying dust) they also retain the grease in the bearing.