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Old 25-03-2008, 13:10   #1
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Yanmar 3GM30F Engine Electrolysis

Hi, I recently picked up a Hunter with a Yanmar 3GM30F eng. The eng is equipped with a heat exchanger. So it is running fresh water in the engine and Salt water is supplied to the heat exchanger for cooling. My concern is that there are no zinc anodes in the heat exchanger where there are a number of dissimilar metals and saltwater. As this is a recipe for Electrolysis I was wondering has anyone experienced this problem with this type of eng. The only way to remedy this that I can think of is to custom build a end cap for the heat exchanger that can accommodate an anode without interfering with the core.
Also, The manual is not very clear but seems to indicate that the engine block zincs (2) and the eng. head zinc (1) are not used when the eng. is fresh water cooled. This makes sense to me. It does not make sense that the heat exchanger does not have a place for a zinc .
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Old 25-03-2008, 13:15   #2
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I am not an expert on this particular engine but I do seem to recall a similar thread discussing this exact same issue with some Yanmar engines.
Gord May most likely will give you some kind of a link to this issue - it's what he does and he does it well.
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Old 25-03-2008, 14:17   #3
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Yanmar uses cupronickel heat exchangers. Extremely low to non existant corrosion factor so no zincs fitted. Most engine mfg use copper heat exchangers which need a zinc to keep corrosion at bay.

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Old 25-03-2008, 15:16   #4
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If it needed a zinc, Yanmar would have designed an end cap to use one. There are many thousands of these engines in use and none have internal corrosion problems.
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Old 25-03-2008, 17:27   #5
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Dont overthink the issue, Yanmar does not use a zinc in any fresh water cooled small hp motor
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Old 25-03-2008, 20:36   #6
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You are correct there.....

All to often, owners are their own worst enemies when it comes to "re-engineering" things......

One of my favorites is the guy who put two racors (500 series) in-line along with an algae-x on a 1GM Yanmar.....


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Dont overthink the issue, Yanmar does not use a zinc in any fresh water cooled small hp motor
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Old 26-03-2008, 03:15   #7
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There’s numerous CruisersForum discussions about Yanmar Zincs, which can be searched at “Google Cruisers & Sailing Forum” (type yanmar zinc): Cruisers & Sailing Forum

As others note, I've never experienced any corrosion problem with my 2GMF, sans zinc.
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Old 26-03-2008, 06:18   #8
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Thanks all for the info. Glad to hear that the cupronickel alloy in the heat exchanger doesn't appear to require zincs. My fears have been put to rest.
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Old 12-06-2010, 08:08   #9
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Yanmar 3gm 30f zincs

Thanks for all the info. I recently moved our Irwin Citation 38 from the Gt lakes to the USVI and was concerned about the zinc issue or the lack there of.

Thanks
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