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Old 06-30-2016, 10:40 PM   #1
City: Buffalo, Minnesota
Country: USA
Vessel Name: Moon Shadow
Vessel Model: 1997 Mainship 350/390
Join Date: Aug 2015
Posts: 9
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, 06:02 AM   #2
Shoalwaters's Avatar
City: Rodney Bay Lagoon
Country: St. Lucia, West Indies
Vessel Name: "Dragon Lady"
Vessel Model: DeFever 41
Join Date: Feb 2008
Posts: 612
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.

If all else fails, read the instructions
If it ain't broke, don't fix it
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Old 07-01-2016, 07:18 AM   #3
cardude01's Avatar
City: Victoria TX
Country: USA
Vessel Name: Bijou
Join Date: Nov 2012
Posts: 2,158
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, 07:53 AM   #4
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City: Hobart
Country: Australia
Vessel Name: Theresa
Vessel Model: Cheoy Lee 66 LRMY
Join Date: Jun 2013
Posts: 91
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, 09:41 AM   #5
Ski in NC's Avatar
City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 2,717
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, 10:56 AM   #6
Pgitug's Avatar
City: Punta Gorda, fl
Country: Usa
Vessel Name: Escapade
Vessel Model: Nordic Tug 37 2002
Join Date: Jan 2015
Posts: 616
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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