If the water pump impeller in the out drive is over a couple of years old, you should replace it. If you decide to do that, post it here and I can send a plan for a very useful jig that clamps in a vice and holds the lower unit so it’s easy to work on. It even provides a flat area to set a few tools and parts while you’re working on it.
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 Scott, Portland, OR '85 V-20 I/O, Merc 170
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