Yanmar 2GM in saltwater...???

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malyea

malyea

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Dec 15, 2009
236
'87 Irwin 43 Sea Breeze
Might be moving to St Augustine in the not too distant future and probably/possibly taking my '82 H30 out of her freshwater home here in GA and dunking her in the salty sea...

How long will the original (I believe) 2GM (raw water cooled) last considering salt water corrosion? So far as I know and can tell, she's lived most her life in fresh.

Is it realistic to consider converting the 2GM to a 2GMF (closed cooling system with heat exchanger)... or... just keep the original motor until the rust kills it?
 
kloudie1

kloudie1

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Nov 6, 2006
10,072
Hunter 34 Mandeville Louisiana
Malyea.. As long as you keep the zincs in OK shape, that engine does not corrode (ok the corrosion rate is very low) and will last a LONG (as in decades if there is no previous damage and no defects in the block casting) time in salt water.. but ya have to keep the zincs up..
Yes, you can convert to fresh water cooled but I doubt the cost could ever be justified..
 
tomgrigsby

tomgrigsby

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May 21, 2009
360
Hunter 30 Smithfield, VA
kloudie1 said:
Malyea.. As long as you keep the zincs in OK shape, that engine does not corrode (ok the corrosion rate is very low) and will last a LONG (as in decades if there is no previous damage and no defects in the block casting) time in salt water.. but ya have to keep the zincs up..
Yes, you can convert to fresh water cooled but I doubt the cost could ever be justified..
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B

Blaise

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Jan 22, 2008
359
Hunter 37-cutter Bradenton
I have a friend that has a 2gm20 in a trimaran for 23 years with no problems. You are putting it in seawater, not hydrocloric acid.
 
Ed H

Ed H

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Sep 15, 2010
244
Hunter 33_77-83 Regent Point Marina, Virginia
My 1981 Hunter 33 has been in the lower Chesapeake Bay for 30 years. The raw water cooled 2GM seems to be in great shape. Ed H
 
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