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Recent content by sonic33

  1. S

    Water temp go up and down on a Mercruise 502 engine

    My boat has twin 502 with 165 hours. Both are running great, and the water temperature gauges both maintain a 165 temperature. But one engine started having the water temperature gauge high to 230 (moves fast) then it goes down to 0 and then back climbs back up slowly. At first, I thought the...
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