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I replaced the motor, and that seems to have fixed the leak. I suspect that during my first attempt to replace the shaft seal, I damaged some part of the motor while struggling to remove the impeller. After that, the shaft was slightly off center, such that the two sides of the seal were not...

@Vickery, @Kiss4aFrog - Thanks for the suggestions. That seems quite likely after everything I've tried so far. @JamesW - The impeller screw is secure. I'm 99% sure it's coming from the seal, or at least somewhere in that vicinity. I have also replaced the gasket just to make sure (and it...

I have a Pentair Whisperflo pump. There is water leaking from behind the seal plate of the pump, under the motor. Exactly like you would expect from a bad shaft seal. I replaced the shaft seal. Still leaking. I replaced it again, thinking I might have accidentally touched it or got some dirt...