I would agree with John(above) that 3100 is too high for continuous operation. Max RPM is 3600, we cruise at 22-2500, anything above that and we start to see more smoke/steam out the exhaust. If you run it again at normal RPM and don't have an overheat alarm come on you probably don't have any problems.
SV Laurie Anne
1988 Brewer 40 Pilothouse