Yanmar 2GM 20(F): Raw or Fresh Water Cooled version. How can I tell? - SailNet Community

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Old 10-19-2008
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Yanmar 2GM 20(F): Raw or Fresh Water Cooled version. How can I tell?

For the diesel (or Yanmar) junkies, how can I tell if my diesel Yanmar 2GM 20(F) is raw or fresh water cooled? I have the original manual and paperwork, but it only says, "If you have the raw water cooled version, do X," and "If you have the fresh water cooled version, do Y".

I'd like to know so I can read up on how to winterize one or the other.
danke!
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The model number will tell you, the f means fresh water.
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Does it have a little plastic tank on the upper right side of the engine filled with pink antifreeze, then it is fresh water cooled.
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To denby and bubb2, wow!
If it's that easy to just go off of the "F" in the model name, then great! thanks.
I'm at home (my land home) at the moment, so I'll double-check with the engine itself to look for a plastic tank with the pink antifreeze.

(yay! This forum is excellent -- I'm learning so much from y'all. thanks.)
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Yes a 2GM20F would be fresh water cooled. Another easy way to tell is look at the motor. Does it have a radiator cap on a long box looking bit to one side. That would be the heat exchanger.
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I have one of those. The F engine does have a plastic tank to put anti-freeze in. Also it is raw water cooled also.Water goes to impellor and pump and out the back. Forgot to open sea-**** one day. alarm went off.shut her down. if not for fresh water cooling I may have damaged her more. All I did was burn up the impeller . ThankGod
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Re: Yanmar 2GM 20(F): Raw or Fresh Water Cooled version. How can I tell?

My Yanmar says 2GM20 on the engine plate but is fresh water cooled? It has the heat exchanger, coolant reservoir etc. Should the plate read 2GM20F or could i have a modified 2GM20? I want to be sure i am referring to the right parts of the manual. Ie the 2GM20 has zincs but the 2GM20f does not. Can anyone share some insight?

Thanks,
Warren, - Vancouver British Columbia - 1979 Catalina 30
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Re: Yanmar 2GM 20(F): Raw or Fresh Water Cooled version. How can I tell?

If you have the little plastic coolant resivior you have fresh water cooling or more correctly a closed loop cooling system that circulates a fresh water/anti freeze solution through your engine.
This solution is cooled by the sea water that is pumped through the exchanger and then exits through your exhaust. The big advantage is no salt water in your engine, just the anti freeze solution that contains rust inhibitors etc.
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