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Go Back   SailNet Community > On Board > Gear & Maintenance
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Old 07-11-2007
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a simple zinc question...

My prop shaft does not have a zinc on it, and it looks as though it has suffered some galvanic corrosion as a result. Anyway, I would like to put it on the inboard side of things so that I can swap it out as needed, and I'm assuming I simply need to sand the shaft down a bit to expose some fresh metal, screw on the zinc and, that is that. Since it's going to be spinning at 2000 rmp, I thought it might be prudent to ask if it's as simple as all this...
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Old 07-11-2007
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I would like to put it on the inboard side of things so that I can swap it out as needed...

What do you mean by this?
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Old 07-11-2007
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Your engine runs at 2000 rpm, The shaft should be about a third of that.
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Old 07-11-2007
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Don't sacrificial anodes (zincs) need to be suspended in an electrolyte in order to work? Where would you put the zinc inboard so that it was in water?
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Old 07-11-2007
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USCG,
My neighbor has his zinc installed just forward of the stuffing box so that he doesn't have to get wet to swap it out. On its face, it seems like a good idea to me. However, the zincs I've seen on prop shafts tend to be on the wet side of the shaft. Is this where they should go?
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Old 07-11-2007
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Definetely-The water is the electrolyte so to speak.
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Old 07-11-2007
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Zincs have to be in the water, period.
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Old 07-11-2007
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When putting on a prop shaft zinc, once you tighten it, tap it a few times with a hammer, retighten, then repeat. If not properly put on, they WILL fall off eventually. And yes, they need to be on the wet side, in the water.

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Old 07-11-2007
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Yup...near to the prop is best and be sure the shaft is nice and shiny where you attach the zinc before installing like PB recommends.
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Why would you putz a zinc on the prop shaft...should'nt there be a zinc in zee head and zee galley???

I'm sorry...I know that was lousy
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