said by leibold: said by TheMG:
Furnace manufacture date is 1976.
You said it didn't make any abnormal sounds, how did you find out anything was wrong ?
It did start making noise just today, that's when I looked at it and found what you see in the pictures.
Looking at the amount of wear, the bearing was obviously out of oil and on its way out long before it started making noise.
said by jrs8084:
Just curious: was this a belt drive setup and was the point of wear in the direction of belt tension? (i.e. was the belt minimizing shaft play/noise?) You wouldn't think so, but bearings can do weird things when they wear out.
Indeed, this is a belt drive setup. The wear is in the direction of the belt tension.