For the first time ever, the overheat buzzer activated. Also note that I rarely really run the motor but do crank it up on occasion just in case I get the opportunity to fish. I removed the cylinder head cover and found the thermostat and cover/head full of deposits (BTW, this has been a salt water boat its whole life) as you can see in the attached pics.
I replaced the thermostat, and cleaned up the pressure relief valve, the head cover and head and reassembled with a new gasket. Surprisingly, the buzzer still activated after a few minutes at idle. I check the cylinder head temp with a infrared thermostat and the buzzer activated around 212 degrees F just like the service manual said it should so I dont believe temperature switch is faulty.
The service manual indicates the next steps include removing the head itself to check for various serious issues but also obstructed water passages or missing deflectors.
Based on the deposits found on the thermostat and all, it wouldnt surprise me the water passages may be obstructed. Before I take the step of removing the head, is there anything I should try?
Thanks in advance,
Ken
I replaced the thermostat, and cleaned up the pressure relief valve, the head cover and head and reassembled with a new gasket. Surprisingly, the buzzer still activated after a few minutes at idle. I check the cylinder head temp with a infrared thermostat and the buzzer activated around 212 degrees F just like the service manual said it should so I dont believe temperature switch is faulty.
The service manual indicates the next steps include removing the head itself to check for various serious issues but also obstructed water passages or missing deflectors.
Based on the deposits found on the thermostat and all, it wouldnt surprise me the water passages may be obstructed. Before I take the step of removing the head, is there anything I should try?
Thanks in advance,
Ken
