Overheating 350 Mercruiser MPI Bravo Problem solved, 3 part short Video series. Dennis Allen

Overheating 350 Mercruiser MPI Bravo Problem solved, Dennis Allen of Affordable Marine Service in San Diego California in January of 2020 .

Final sea trial with clear hoses installed on engine and Bravo outdrive to show the amount of flow and water direction within the hoses.

Watch all three short videos to show the the strangest overheating problem that is so rare that in over 40 years working on boats we have never come across this situation. The water flow on Mercruiser MPI with Bravo in some applications enters from raw water pump to engine circulation water pump hose thru a Y fitting and can actually make the incoming water flow go backwards thru the circulation pump hose up to the thermostat housing rather than down the circulation pump hose if the circulation pump impeller spins freely on the shaft , sort of spun hub scenario, VERY RARE , one of a kind

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[davidgaziano]

What kind of clear hose are those and what size?

[MichaelM...TandTribs]

Hi guys, I have just bought a bayliner 2655, and on its maiden journey, as soon as I put load on the engine, oil pressure rose to max, smoke started to billow out of the engine and the engine stalled... Took about 15seconds... Wondering if you would have any idea as to what that could be?