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Message: <blockquote data-quote="maintenanceguy" data-source="post: 485145" data-attributes="member: 24227">I would wire brush what I can reach with a small brush and not worry too much about the rest.  Just verify that the passages are clear, running in salt water for years can close up those passages.I'd also use fine (200 grit) emory paper on the shaft to prevent damaging the rubber impeller when you slide it on.   I also liberally grease the shaft first.A little gasket sealant (the kind that stays flexible) on the gasket is a good idea if the mating surfaces aren't perfect.  This water pump isn't high pressure at all so a perfect gasket seal is what you want but a good gasket seal will work.</blockquote>