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Rudder Post Leak

Discussion in 'Ocean Yacht' started by alvareza, Aug 2, 2019.

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  1. Capt Ralph

    Capt Ralph Senior Member

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    The drawback of stainless steel, wet and encased, crevice corrosion develops and stainless fails on itself.
    I'd bet, pull those screws and a few will be black. I do not know how to test them reliably with out just replacing them.
  2. alvareza

    alvareza Member

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    cleanslate, really good point. I will pull and replace a few as suggested by CR to see if I have an issue.

    Also, I don’t know the material used for the trim tabs. The anodes on the tabs wear out much faster than all the others zincs. Wonder if the tabs are something other than stainless and reacting with the screws.

    Hope this does not turn into a boat$ project.

    Spring project is trolling valves.
  3. chesapeake46

    chesapeake46 Senior Member

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    It might be that the tabs are not tied into the rest of the bonding system on the boat ?
  4. cleanslate

    cleanslate Senior Member

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    Mine go way back to 1981 mine stayed in on the bottom water side and did not leak luckily and all are not bad.; Yours looked ok, but you never know. If broke pull them and re install with S/S again or silicone bronze , if you can find machine bolts that size. But I think the trim tab is perhaps bronze sheet..darn if I know. I will sand one of mine down ( remove the bottom paint) while I'm out to see.
  5. cleanslate

    cleanslate Senior Member

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    No they are not, they are protected by a zinc on their own. I'm not bonding mine. Still there after 40 years and they work just fine. I've got plenty of other stuff to do on my Ocean ''not'' Yachts.
    :)
  6. Capt Ralph

    Capt Ralph Senior Member

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    Bottom of the bottom pic in post #38 shows your bonding wire.

    On our Bertram, The factory 42 years ago used stainless on all underwater items except for the bonding wire connect, it was bronze. Lower wet electrical resistance. It had zincs on the trim tabs when we purchased it, still use them (zincs) now.

    Bonded or not, zincs on a trim tab seems to always be a good idea, as long as there was a hole drilled for it.

    Tabs are usually made of stainless steel.
  7. cleanslate

    cleanslate Senior Member

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    That is good to know. Of course S/S tab, S/S fasteners.....You can drill your own hole if one is not there. Like my rudders....that will change soon.

    Anyway Capt Ralph, how's it hangin'? o_O Things doing Ok?
  8. Capt Ralph

    Capt Ralph Senior Member

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    Embarrassed my self well yesterday on another thread. Took a couple of pain pills and wrote a page of stuff with examples.
    When questioned on it by a friend later in the day, I re-read it; what a bunch of nonsense I typed.
    So, I am well, new hip doing well, therapy doing well, back doing better but mind not working well with new drugs.
    Thanks to all for your good thoughts, vibes and prayers.
    Duck-Watching-You.jpg