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  #1  
Old 10-14-2008
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Engine head exchanger zinc

Engine head exchanger zinc was replaced about 6 weeks ago. I just replaced it again. It was completly gone.
Is this normal

Universal 25 1984 Catalina 30
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Old 10-16-2008
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Are you at a dock with electricity? If your up North and going to be hauled check the prop zincc or have a diver or self check them. Seems that you might be in an area with galvanic reaction. Had the same engine and the pencil zinc would last for years.
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Old 10-16-2008
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David-

If you're talking about the internal heat exchanger zinc... no, it isn't normal to have it disappear in only six weeks. You've got an electrical problem of some sort if the zinc is disappearing that quickly.
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Old 10-18-2008
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Wow that's interesting. The guy at Hanson Marine said 30 days is not unusual for that zinc.

Will check the prop zinc though.
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Old 10-18-2008
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He said that it is normal for the heat exchanger zinc normally only lasts a MONTH???
Quote:
Originally Posted by davidpm View Post
Wow that's interesting. The guy at Hanson Marine said 30 days is not unusual for that zinc.

Will check the prop zinc though.
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Old 10-18-2008
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on that note - why do some engines have exchanger zincs and some do not? Isn't it beneficial to all engines?
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Old 10-19-2008
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Quote:
Originally Posted by sailingdog View Post
He said that it is normal for the heat exchanger zinc normally only lasts a MONTH???
Yep, said that he knows guys that keep a box of pencil zincs on board because of that. I was talking to a guy with about 20 years experience too. The usage rate must be highly variable
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Old 10-19-2008
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It depends on the size of the zinc. I have seen zincs that are so small in diameter and overall weight that I would be surprised if they last 1 month. If you want to get more life out of it you might try flushing your raw water line with fresh water each time after you sail. That would reduce the galvanic reactivity of the raw water system (no electrolyte to support conduction of ions).
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Old 10-20-2008
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Quote:
Originally Posted by KeelHaulin View Post
If you want to get more life out of it you might try flushing your raw water line with fresh water each time after you sail.
Good idea but not likely to happen on this boat.
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Old 10-21-2008
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Another thing you could do would be to find a location in the raw water system to install an additional zinc; or attach a ground wire to the heat exchanger housing that you route to an external zinc "fish" that hangs over the rail.
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