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T&T: Can you over zinc a boat?

From: Robert Kassal (no email)
Date: Sat Jun 02 2007 - 14:51:39 EDT

  • Next message: tands: "Re: T&T: Twin Disc"

    My diver thinks our boat is over zinc'd. This is a 48 foot boat with long
    shafts and it has three zinc's per shaft, one each on the rudders and trim
    tabs. The latter are probably a size too big.

    During the barnacle removal, the diver hit a 5/16" SS bolt (that attaches a SS
    swim platform support to a SS transom bracket) and it broke at the head. The
    post mortem shows a large pit into the bolt right at the head. I know this
    bolt has only been in the water 8 months.Could this be the result of too much
    zinc?

    Bob
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