Hi!
The difuser was indeed pressing on the impeller.
I changed all seals and o-rings and the impeller was now running freely. Then, the motor got even noisier, I dismantled to check and found the bearings were in bad shape and, since the motor was pretty corroded, decided to replace the motor.
Installed a new replacement (Marathon Electric) and everything is whisper quiet and working great!
Thanks for all the help!
S21
Hayward Super Pump motor noisy & hot to the touch
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