Port high water temp problem

[LARRY VALENTINE]

After leaving the yard for bottom paint and replacement of the port engine salt water Groko strainer mechanism , I noticed the hot water light and buzzer for the port engine come on while tying up at my dock with the engins running at low rpm from the boat yard. This happened after about 30 min of slow running. Both water guages read less than 180 degrees and the port engine felt hotter than the starboard with my hand placed on top of the heat exchanger. The through hull open/close lever was wide open . Any idea what would cause that? Impellars were rebuilt last year. Thanks, Larry Valentine

 

[doc g]

Air Lock ??? .........Pat

 

[Finalee]

It is a process of elimination. An IR gun would sure help. It could be as simple as a bad ground or sensor. I would shoot the temp at the sensor for verification.

 

[saltshaker]

It is a process of elimination. An IR gun would sure help. It could be as simple as a bad ground or sensor. I would shoot the temp at the sensor for verification.

Agreed. Are you certain it was the water temp alarm and not exhaust temp alarm? Exhaust alarm can alarm even though the engine cooling temp is fine.

 

[Pascal]

How was the flow out the exhaust ? First thing I look at after a haul out

Then use an IR gun to check actual temp

I learned the lesson a few years ago after launching following service. Cat tech was in the engine room to check things during sea trial and he waited 15 minutes to check the water pump covers. Burned his hand. For some reason one of the two engines (3412Es) and not self primed. Up at the helm coolant temp was still just below 180.