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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Old 02-17-2012
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I have a 1982 2GM, raw water cooled. I am not suggesting it is worth converting, but I do question the comment about requiring a different exhaust. Perhaps I am missing something, but if one were to add a 2nd pump, then one pump would circulate "fresh" water / antifeeze through one side of the heat exhanger and engine block, and the other would bring salt water in from the throughhull, through the other side of the heat exhanger and then could this not then go to the same mixing elbow / exhaust that is currently used ??
Please feel free to school me, if I have missed something.
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Old 02-17-2012
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Northeaster :

Yes, I don't see why it would need a new exhaust elbow.

It seems irrelevant to me.

I certainly would not do the conversion. It is far too complicated, and expensive. Just watch that the raw water system doesn't freeze and it will be ok.

A raw water-cooled moter runs a bit cooler, but live with it. A bit less power, a bit more smoke (or something).

Who cares?

Last edited by Rockter; 02-17-2012 at 11:20 PM.
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Old 02-17-2012
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If you go for a heat ex and raw water pump, the exhaust riser should be OK if it worked before.The pump output determines if you have to split and dump some. Better to put on bigger pulley and slow it down.The usual culprit, Anti syphon, is still important.And I am a believer in safe guards so my exhaust riser dumps to bilge when key is off.
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