Great article as always.
As an anecdote about strainers. When I bought my boat, I tuned the motor up. Part of that tune up was emptying the strainer. After the tune up, I was intermittently overheating. I could NOT figure out what was wrong. Sometimes it would pump, sometimes it wouldn't. It turned out that the cork gasket on the strainer was shot - it broke the seal and the air leak prevented the coolant water from circulating. So, replace those gaskets folks!
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