Poppet valve diaphragm water in cowl 1989 Mariner 75 HP 3 cyl


Seaman Apprentice
Jul 2, 2010
Thought I would try to contribute something helpful to the forum instead of asking questions. I was having water leak in the cowl coming from the hole on the cylinder cover that houses the thermostat and poppet valve. I took a couple of pictures so if anyone else is having this problem, they can see what is causing it. No need to write up how to do it as the pictures are self explanatory. Simply replace the ruptured diaphragm and your done.IMAG0468.jpgIMAG0467.jpgIMAG0470.jpg