I have a ss impeller with the 4 grooves machined into the wear ring surface
(water seal) wear ring clearance is .013 per side . when I ran the boat for the first time last weak I had a rubbing type noise that appeared to be coming from the pump noticeable at idle the noise stopped right off idle .I dissassembled the pump ,the only thing that appears different in the wear ring looks and feels like its kinda taking on the shape of the impeller wear ring surface.my question, is this A normal thing with this type of water seal surface