Although I have learned not to disagree with Maine Sail (the hard wayI am yellow), in this case I will temper my response.Keep in mind that one half of the PSS is a carbon block directly in contact with a SS rotor which is directly in contact with the prop shaft. I have noted increases in zinc erosion speed on almost every boat I have installed a PSS on, including all of my own boats I installed a PSS on.. Is this bad? Not necessarily, but the zincs just won't last as long and you should not let them entirely waste. I much prefer to see a PSS used with an AQ-19 or AQ-22 shafting material rather than bronze (really brass) or lower grades of SS. Everytime I install graphite packing or a PSS i let the owner know to check the anodes more frequently until they get a sense of anode life.
Not really when think about replacing prop,strut,shaft,pas seal or stuffing box all at the same time ...ask me how I know....I have done this...two zincs are at worst $30.00 compaired to $2500.00 for the other stuff at minimum .....Man- you guys are waaay overthinking this thing.
I'm referring to the worry about balance, offsetting the mounting screws etc.- totally unnecessary IMHO.Not really when think about replacing prop,strut,shaft,pas seal or stuffing box all at the same time ...ask me how I know....I have done this...two zincs are at worst $30.00 compaired to $2500.00 for the other stuff at minimum .....
My Hunter 430 is the same. I have the Ag/AgCl electrode and used it to enlighten me and clear up the wiring.Interestingly, the electrical prints show only the yellow wire dc return ground bus connected to an engine bolt. The green/yellow wire bonded components (keel, chainplates, mast, compression post, forestay, arch, diesel filer neck) apparently do not tie to an engine bolt that I can find yet.
Bill - Good advice...That's exactly what I did to buy time until I can figure out what might be causing accelerated wasting of th zincs. Charles had suggested this as well.Presumably the zinc wasting is happening at the slip. Sooooo why not grab one of those big zinc 'fish" or a bunch of random zincs and wire them together. run a wire from them to the engine block ground or where ever you are trying to protect some metal parts and then drop it over the side of the boat when at the slip. Should help prevent the hard to replace zinc wasting with easy to replace zinc wasting.
FWIW
A drop zinc will only spread the loss from you normal zincs and NOT stop it. I use the zinc fish in when in a transient Marina to protect from possible stray currents.Presumably the zinc wasting is happening at the slip. Sooooo why not grab one of those big zinc 'fish" or a bunch of random zincs and wire them together. run a wire from them to the engine block ground or where ever you are trying to protect some metal parts and then drop it over the side of the boat when at the slip. Should help prevent the hard to replace zinc wasting with easy to replace zinc wasting.
If you were doing TWO on a shaft, I assume you put the other as close to the shaft tube as you can?I like to see it two finger lengths from the strut. This limits unbalancing the shaft, especially long shafts. It minimizes shaft whip when the anode wears unevenly..
What's your shaft diameter?p.p.s. duh! didn't measure, what size zinc do you think I need for this?
Found it! Thanks. I just found the docs, it's a 63mm zinc.What's your shaft diameter?