Lots of Qs.
Had the ball/roller bearings spun on the shaft, if not what where your repairers doing to trash the shafts. (remove bearing cage, drop out balls/rollers and off with the outer track. ready with extractor for inner track, add lube to fit and torch inner track with oxy-acet. lube...
Mechanical engineer needs some help please.
I have a nice old iron centrifugal blower (circa 1958) and do not know what value run cap to use (no start cap). I have tryed a 2uF and the motor is very-very slow to run up to speed although as speed gets close to rated rpm the torque realy picks up...