Judy, I replaced my shaft zinc yesterday after 1 year in salt water. One half was almost depleted while the other half was barely pockmarked. The diver showed me a copper insert in the zinc collar which has to make contact with the shaft.He says once the collar is placed on shaft u have to hammer it to ensure copper makes contact. Your zincs will wear evenly then. I pass this on for those like myself who had no clue this was required.//leroy
--- In [email protected], "Judith Blumhorst, DC" <drju...@...> wrote: > > Ditto what Bruce says. > > I've got 2 streamlined collar anodes on the prop shaft and a 3 or > 4" diameter "rudder" anode on the strut. > > The rudder anode looks like two discs, one on each side of the strut. The > discs are attached with a bolt through the strut.) >  > Don't obstuct the water flow into the cutlass bearing when you attach the > shaft anodes. Be sure to leave a 1/4" or 1/2" between the shaft anode and > the cutlass bearing. > > On average, they last about 8 months, depending on what boats move into the > area.... the diver checks them every 4 months and replaces them as > indicated. > > I'd recommend the anodes that erode from the outside surface > inward.   It's easier to tell when they're almost consumed. They have a > small percentage of cadmiumin added to the alloy. > > Fair winds, > Judy B > > > > > > ________________________________ > From: Bruce Horne <bho...@...> > To: [email protected] > Sent: Wednesday, June 10, 2009 2:39:21 PM > Subject: RE: [IC27A] Zincs > > > > > > Hello: > I have one on the shaft but Iâm thinking about putting one on the strut > also. Itâs getting pock marked.   Iâm thinking the flat kind that > power boaters use . I could drill and tap a hole to attach it. The rubber > inside the cutlass bearing electrically isolates the strut from the shaft so > the shaft zinc canât protect the strut. The bronze thru-hulls would be > protected by a bonding wire, although I donât have one and they are in > great shape for an old boat (and Nigel Calder doesnât recommend bonding the > thru-hulls - he states they will actually deteriorate faster if attached to a > bonding wire. >  > From:ic...@yahoogroups. com [mailto:IC27A@ yahoogroups. com] On Behalf Of > Derek Atkin > Sent: Wednesday, June 10, 2009 5:04 PM > To: ic...@yahoogroups. com > Subject: [IC27A] Zincs >  > > > > > > What is the usual compliment of zincs on a C27? I checked catalina direct > that they didn't have much in the way of parts. I want to be sure I am not > missing any when I splash the boat. > > Thanks > > Derek. > #4297 > 79 C27 > > ________________________________ > > No viruses found in this incoming message > Scanned by iolo AntiVirus 1.5.6.4 > http://www.iolo. com > ________________________________ > No viruses found in this outgoing message > Scanned by iolo AntiVirus 1.5.6.4 > http://www.iolo. com >
