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Old 31-07-2013, 19:05   #1
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Yanmar 2GM20 - Cooling-recirculating..?

1st..not mechanic. Not had boat long. Top of engine - front- 2 hoses (water) leave the engine, go through wall up towards controls- then affixed to wall. Hoses are joined with T piece and other hose has plug.......WHAT THE HELL are they / what do they do / what are they for.I may be dumd - but i dont get the purpose...HE:LP
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Old 31-07-2013, 19:08   #2
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Is one end attached to the thermostat housing?
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Old 31-07-2013, 19:18   #3
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Re: Yanmar 2GM20 - Cooling-recirculating..?

I believe what you are describing is a vented loop above the waterline that aids in preventing a siphon that can flood your boat.

Vented loops and anti-siphon valves ; how they work on boats
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Old 31-07-2013, 19:57   #4
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Re: Yanmar 2GM20 - Cooling-recirculating..?

Or it could be the heating hoses for a water heater that was removed.
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Old 31-07-2013, 20:10   #5
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I was actually thinking it was a high point "burp"
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Old 01-08-2013, 01:37   #6
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Re: Yanmar 2GM20 - Cooling-recirculating..?

Thanx for reply people, i will try to remember to take photo next time i am aboard. I like the water heater theory as it is under pressure. I will post pic of connection points when i next go to boat.
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Old 01-08-2013, 01:42   #7
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Re: Yanmar 2GM20 - Cooling-recirculating..?

Vented loop....sound likely. Simple yet effective ...Thanx Beersmith.
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Old 13-08-2013, 00:57   #8
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Re: Yanmar 2GM20 - Cooling-recirculating..?

Here's the pic of motor - its the white pipes
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Old 13-08-2013, 05:59   #9
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Are you sure that's a 2GM20 and not a 2Gm? I don't see a heat exchanger.
If its a raw cooled engine you're probably looking at a vented loop.
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Old 13-08-2013, 07:36   #10
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Re: Yanmar 2GM20 - Cooling-recirculating..?

The rear hose is connected on the mixing elbow?
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Old 13-08-2013, 08:46   #11
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I also believe it is a 2GM and yes the rear white hose is attached to the mixing elbow.
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Old 13-08-2013, 09:44   #12
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Re: Yanmar 2GM20 - Cooling-recirculating..?



They are most surely hoses supplying heat to the hot water heater. I removed my water heater this past year and plugged the hoses in the same way. That is the heater for the fresh water used in the galley sink and for showers and such.

See the hose on top leading to the fitting with the white teflon tape.
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Old 13-08-2013, 09:47   #13
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Re: Yanmar 2GM20 - Cooling-recirculating..?

The previous picture is of a fresh water cooled engine, but it may be that the water heater would be supplied with heat in the same way, with the hot water then dumped into the mixing elbow.
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Old 13-08-2013, 10:00   #14
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I didn't think that raw water cooled engines typically were connected to water heaters because they operate at much cooler temperatures.
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Old 13-08-2013, 17:07   #15
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Re: Yanmar 2GM20 - Cooling-recirculating..?

My motor is raw cooled. Hoses stay together under seat, through seat backing down low, then up behind seat back, join into T other hose extended about 100mm and is plugged, Finishes about waist height.
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