Try bashing that "good" zinc with a hammer. Sometimes they look ok but are actually spongy and no good.
I have zincs on my steel (fiberglassed) rudder and rudder fittings. They are substantial and have never become completely used up even though I sometimes go two years between haul-outs. There is no zinc on my prop shaft as there is no place to put one. The zincs that get used up really fast are the ones in the main engine seawater circuit: seawater pump, reduction gear oil heat exchanger and engine heat exchanger. I replace them yearly. I don't know anything about fresh water zincs. Norm S/V Bandersnatch Chesapeake Bay ----- Original Message ----- From: Bob Johnson To: [email protected] Sent: 10/26/2009 5:10:42 PM Subject: Re: [Liveaboard] Lifespan of zincs Could be you got a fresh/brackish water zinc vs one for salt. I don't remember the base metals but I'm sure Norm will respond. Bob PDQ 36 Peace
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