I had the boat out yesterday to test the temperature control after replacing the thermostat and insuring that all of the
lines were clear. After running 30 minutes at 80% engine RPM I found the temperature at the sender (near the thermostat) to be 110 deg - not hot enough to open up the thermostat (which is rated at 140 deg). I had some coughing water out of the
exhaust from the start and throughout the run.
I find this very curious because I know the purpose of the thermostat system is to get then engine temp up to 135 to 150 and keep it there.
Any other ideas how I continue to track the problem down?