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Yanmar cooling confusion

I'm getting familiar with my I-30 that has a Yanmar 2GME engine. My previous boat had an Atomic 4. Based on the surveyor's report, the engine is fresh water cooled. However, he also notes that one of the thru hulls has an "internal strainer for engine raw water". I'm confused. I didn't see a water muffler so I'm assuming that it is indeed fresh water cooled. Any thoughts?
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post #2 of 5 Old 04-11-2013
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Re: Yanmar cooling confusion

A fresh water cooled marine engine still draws in raw water. The raw water goes through a heat exchanger which cools down the engine cooling water.

This way the salt water is only in one small system instead of being pumped through the whole engine.

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Re: Yanmar cooling confusion

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A fresh water cooled marine engine still draws in raw water. The raw water goes through a heat exchanger which cools down the engine cooling water.

This way the salt water is only in one small system instead of being pumped through the whole engine.
Thanks. I would assume there is a separate pump for the raw water. However, the only drawing I've been able to find for the engine shows a single cooling water pump. Unfortunately, the only Yanmar document the previous owner had is a six-page user's manual that is very light on any details.
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post #4 of 5 Old 04-11-2013
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Re: Yanmar cooling confusion

With a "fresh water" cooled engine you will have two (2) water pumps. One pump forces raw water through the heat exchanger (HX), the other forces anti-freeze through the HX. So, if you sail on salt water there really isn't any fresh water involved in the cooling system unless you put fresh water in to dilute the anti-freeze.
The term "fresh water" cooled is misleading. Closed circuit cooling makes more sense to me.

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post #5 of 5 Old 04-11-2013 Thread Starter
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Re: Yanmar cooling confusion

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The term "fresh water" cooled is misleading. Closed circuit cooling makes more sense to me.
You're right. It's just the term that seems to be used in the Atomic 4 community. Just refers to a closed system.
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