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Merc 90 Poppet valve


Wellman

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Hello everyone. I had a problem with my boat this weekend. It would run for about 30 minutes and then would overheat, the alarm went off anyway. I have a good stream out the back of it. I took the thermostat/poppet valve housing off and the thermostat and pooet valve seemed ok. My question is: Should there be a hole in the cast right under neathe the poppet valve. It almost looks like a journal for water, but I am not sure. It would be between the poppet valve and the outer housing. Thanks in advance.

Doug

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