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    New Engine Replacement - Engine Died and Hydro locked after 5 hrs!?

    Do you have functioning exhaust flappers in place? Sounds classic for water entering backwards through the exhaust system. You are lucky if you have not blown head gaskets or bent a connecting rod due to hydraulic lock.
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    idea for bilge plug alternative

    My boat is also on a lift and impractical to reach the drain plug. Even with an automatic pump, the float can jam and “automatic” flappers and caged ball valves will leak with any debris. My solution was to buy a locking 3/4” Mueller gas ball valve (210-524HC) and reduce one side to 1/2” NPT...
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    Mercruiser 5.0 MPI Bravo 3 overheat 5 minutes after starting it up.

    Yes. See Mercruiser 6.2 MPI Bravo 3 overheating
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    Mercruiser 5.0 MPI Bravo 3 overheat 5 minutes after starting it up.

    Look up this post Mercruiser 6.2 MPI Bravo 3 overheating
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    mercruiser 5.0 mpi overheats at idle

    Overheating that resolves with speed usually indicates a partial obstruction in the manifold water input on these raw water engines. While the impeller and its water input should be checked (and replaced every 1-2 years), if the engine cools normally at high speed, then a bad impeller...
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    Mercruiser 6.2 MPI Bravo 3 overheating

    There have been many posts on mercruiser small block stern drives With raw water cooling and dry joint manifolds overheating. One scenario is that the engine overheats at idle but not at speed. Many owners have replaced the raw water impellers, thermostats and water circ pumps without fixing...
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