yamaha 4.3 sterndrive

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K.A.P

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Jun 13, 2014
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overheating after running on muffs for 5-10 min.
Water is circulating.

I put a new thermostat in and instead of the temperature rising all the way to 200 degrees it now stops for a couple min at 140 then just creeps up every min with no signs of stopping.

took intake manifold off and it looks like I am backtracking someone else because the gaskets and water inlet holes are cleaner than I expected. Oil is clean in there as well.

checked the impeller and again looks like previous owner beat me to it.

One riser was a lot hotter than the other one so I disassemble that and noticed this crack in the exhaust manifold.



could this be the problem? I know it needs to be replaced but does it sound like there's more to it?
 

GA_Boater

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Did you find the solution? What was wrong?

Please read the Help Tip on top of the page and start a new topic explaining your problem. It's very hard to get a member to respond when they haven't been here for a year.
 
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