In Reply to: Re: Generator parts for early 9N? posted by JP on November 27, 2018 at 11:16:22:
The bearing is one part still available, p/n 9N-10094, and yes, it is METRIC. The OD is 35mm and the ID is 15mm. All FORD generators used the 15mm armature and bearing up to the later 8N model, then went to the 17mm armature and bearing. The early 9N-10000-A generator pulley is .5905" (15mm) smooth bored with a 1/8" keyway broached thru. the 9N-10000-B generator changed to a .5905"-20 threaded ID on the pulley secured with a nut and lockwasher. Ba$turd sizes were used: .59" equals 15mm but TPI is 20. A 1.25mm thread pitch would be real close to 20 TPI but there is no such thing in the fastener world. TPI = 1 ÷ 20 = .050"; 1.25mm X .03937 (1mm) = .0492". Ford stamped the armature with the script logo and a date code too. If really worn down you may not see it any more.