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Old 06-30-2016, 11:40 PM   #1
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TAMD41P over heat alarm

I've got a 1997 Mainship 350 with twin Volvo penta TAMD41P engines. When I bring the engines up to WOT or close to it the starboard engine over heating alarm sounds and goes out when I bring the engines down to 1/2 throttle. The temperature on both engines are equal around 140-150 *. Where are the temperature alarm sending units? What temperature does the alarm supposed to sound? It doesn't appear to be overheating. Suspect a faulty alarm sending unit. I was going to swap sending units from engine to engine if they are easy to get to. Any thoughts? The water pumps have new impellers. Thank you. Dave.
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Old 07-01-2016, 07:02 AM   #2
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What you are experiencing sounds like a cooling system that is working properly, but is being deprived of sufficient sea water. Suggest you check the seawater intake for obstructions.
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Old 07-01-2016, 08:18 AM   #3
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TAMD41P over heat alarm

If it's not the sending units, I would suspect a cooling system clog issue. I would start by circulating Barnacle Buster through the RW side of the cooling system and see what that does.

Do a search for this. Flyright did a good write up on his successful coolant system flush.
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Old 07-01-2016, 08:53 AM   #4
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Have a play with a infrared thermometer gun,compare the two engines,hopefully that should show up your problem.If the temps as similar I'd do the sensor swap thing.It's happened to me a couple of times.
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Old 07-01-2016, 10:41 AM   #5
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There are two relevant sensors: Gauge transducer and alarm switch. Both up on front of cylinder head in a housing for thermostats. Can't remember exactly where they are.

The alarm going off at high power may mean you do have a real overheat, and that gauge is the one that is off. Shoot tstat housing with temp gun, should be 180-190 at high power, tops.

Alarm setpoint I think is 100C, but memory is foggy. Often side of sensor is stamped with setpoint.

Post some pics of front of engine.
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Old 07-03-2016, 11:56 AM   #6
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I'm with previous post that your engines both should read around 180. The engine alarm may be real. Your water temp readings are probably bogus.
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