The generator began making a whirring noise last weekend when I took the family out and was heard yesterday when I took my son to the park. I stuck a piece of dowel on the generator as the car was running and the sound seems to be coming from the rear part nearest the carburetor. I am thinking it is a bad bearing. I am not anticipating a complete rebuild as the generator is doing a great job keeping the battery charged. What are the other common things that need or should be replaced when you replace the bearing?
If the rear "bearing" is a bushing, the noise is probably being transmitted from the gear or front bearing. Check the gear for abnormal wear and that it's tight on the shaft. Check the front bearing and the brushes. Clean it up, test, adjust and put it back in.
Forgot to mention: If the rear bushing is worn, it can cause the armature plates to make contact with the pole shoes. Look for scuffing on the armature poles.
It's a ball bearing, no bushing. If still an original bearing in place, it's supposed to be oiled through a little brass oiler screwed into the generator. New sealed permanently oiled bearings are cheap. You can pull the generator and take it apart to evaluate what's needed, at least new brushes and a rivet pin for the gear if you pull it down completely to change the front bearing too.
The MTFCA electrical handbook is a great help. If it takes long time to finish the generator it's easy to make a cover plate to be able to still drive the car (just be sure to isolate the generator cable)
(Message edited by Roger K on June 03, 2017)
If it was original, the rear bearing would be babbitt. The bushing, as well as the replacement bearing, are sold by vendors. Either could be installed.
Never mind, I was thinking of the starter. Sorry.