Can somebody tell me whether this motor is overheating?
 

Hi, guys (and gals)... I'm restoring a Sony AV-3650 EIAJ-1 half-inch open-reel VTR. Built like a tank, rubber components are like the day they were made, and I have another machine as a parts source. But I' m worried about the AC motor (this is an "editing" machine that adds a capstan DC motor). After some minutes running, the AC motor gets hot, maybe around 120-140 F, and so stays. I have tried a second motor, and also changed the AC electrolytic condenser, with the same results. Maybe this temperature rise is normal, but I would like to know what is your experience. Thank you very much.

That doesn't seem excessive considering I have seen power transformers run quite a bit warmer. If the motor was defective, shorted turns and such it will usually have a loud hum and will be slow or not turn at all.

Check that everything in the drive is running freely and not putting an excessive load on the motor otherwise I would say it's fine.

It's nice to see someone else working on eiaj tape machines. I have a Sony Portapak AV-3400.

I've had a few of these AV-3600 & 3650's and the motors do get very warm, as long as the little blower wheel is present there shouldn't be a problem, maybe check the motor capacitor to make sure it's alright.