I had a small leak coming off of the seal plate on my Sta-Rite Dura-Glas pump, so I replaced the shaft seal. My seal plate is old. It's probably the original. One of the threaded inserts was sticking out which caused the seal plate to be uneven. When I started it up, I heard the impeller scraping on the diffuser. After taking it back apart,I found a couple shavings from the impeller. There are no gouges, and it still feels smooth. Is the tolerance between the impeller and diffuser important? Should I replace the impeller? It's only a few months old so I feel bad replacing it.
