oldcub
New member
I replaced the existing alternator on my Cub with a 20-102-1 (Lesters 2117) 63 amp one wire alternator from Nations Starter/Alternator. When I kick up the rpm's a little to excite it and it starts charging, it makes a loud high pitched rubbing noise. Putting a sounding rod on it doesn't indicate any of the bearings a bad. I am thinking the shaft has flexed enough to make the fan rub the housing when it is loaded. Any suggestions besides spending more for a Delco?