I have a leak on a Hayward Super Pump that I can't get rid of despite multiple rebuilds.
The pump probably dates from 1998-1999. Two years ago I had the motor rebuilt and reassembled the pump with a new seal and housing gasket. The pump didn't leak at all.
Around two months ago the impeller shaft broke. The plastic looked like it had been exposed to heat, but it could just have been age and chlorine. I got a new impeller (with brass shaft), seal and housing gasket. After reassembling the pump there was a slow but steady leak. I've not been able to get a good visual on exactly where the water is coming from.
Around a month ago somebody who was pool/house sitting let the water level drop and the pump ran dry for a day or two. I got another new seal and housing gasket, but the leak continued.
Yesterday I got yet another new seal and housing gasket, and lacking any other ideas I also got a new seal plate. Still leaking.
I don't have a micrometer gauge, but at eyeball-precision the motor shaft does not appear warped.
The bolts have always been well tightened. I haven't used a torque wrench, but could do so if necessary.
Does anybody have any suggestions on what to try next? Could something other than the seal plate have been damaged when the impeller broke? It's not a bad leak, but it is annoying.