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Bell and Gossett 100 mystery sounds

Hello there, Long time lurker here seeking your expert advice. I had some awful metal scraping sounds coming from my B&G 100 series pump. It's a hot water baseboard system. I checked for the obvious and found a mangled coupler inside. After carefully replacing the coupler and very lightly oiling the 2 motor tubes, and heavily oiling the bearing assembly, I turned the pump back on.



Now I'm getting a very different grinding sound. Not as loud but still not right. It sounds like there is a piece of metal clanging around in there near the bearing assembly or impeller. I know I pulled the entire coupling out, so it can't be that.



Am I missing something here fellas?

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