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    89 Mariner 40HP Magnum over heating

    I was thinking it to be a grommet or some type of seal where tube enters the powerhead. It seems the only way to tell is take powerhead of to see unless you know a better way that would be awesome.. I have checked in a lake after replacing everything. Since it doesn't have a thermostat my...
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    89 Mariner 40HP Magnum over heating

    Hello All Update on over heating. I started over and replaced all gaskets and parts on water pump. also back flushed the motor. To off cooling jacket and plate replaced gaskets. The motor is running cooler but it will eventually run hot. I is like air is getting the flow of water. Sometimes it...
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    89 Mariner 40HP Magnum over heating

    Thank you both for your replies. I have changed out impeller and the water out of tell tell was a little more than before. It still runs hot, if you rev motor up you would get more water out and it wouldn't run hot checked hose to see if and junk was stuck nothing there. I took water pump and...
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    89 Mariner 40HP Magnum over heating

    Does a 89 Mariner 40HP Magnum SN OC186625 have a thermostat? It is a 4cylinder 2 stroke
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