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

captxtina · #1 (**permalink**) 10-19-2008

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!

denby · #2 (**permalink**) 10-19-2008

The model number will tell you, the f means fresh water.

bubb2 · #3 (**permalink**) 10-19-2008

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.

captxtina · #4 (**permalink**) 10-19-2008

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.)

SVDistantStar · #5 (**permalink**) 10-20-2008

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.

denby · #6 (**permalink**) 10-20-2008

Cap,

What state in New England are you?

nalplvr · #7 (**permalink**) 06-07-2009

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