uneven engine temps.

[TMK988]

My port engine is running at around 117 degrees while my starboard engine is running at around 157 degrees during my first solo run. I was running at around 3k rpm for about five minutes when I heard an alarm, so I slowed down and dashed back to my mooring. The boat is an 06 290DA, Bravo 3's, the 6's. When I had the survey in November they were both running at around 160 or so. Now, less than 1 running hour later I have this disparity, any thoughts?

 

[ZZ13]

My port engine is running at around 117 degrees while my starboard engine is running at around 157 degrees during my first solo run. I was running at around 3k rpm for about five minutes when I heard an alarm, so I slowed down and dashed back to my mooring. The boat is an 06 290DA, Bravo 3's, the 6's. When I had the survey in November they were both running at around 160 or so. Now, less than 1 running hour later I have this disparity, any thoughts?

Port engine thermostat stuck open. Replace it and all should be well. Not sure about the alarm. Low temp won't trigger that (high temp will)

 

[TMK988]

Thanks ZZ, that certainly makes sense. What is that they so BOAT stands for?