Join Date: Nov 2009
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If the front edge of the stuffing box is not immersed in water, how would de-zincification occur without an electrolyte? Could it be from the water that leaks through? If so, you would also expect the de-zincification to occur on the INSIDE of the stuffing box, where you can't see it unless you take it apart. Greasing the outside might insulate the visible metal (maybe captflood is on to something here) but that seems like a temporary cosmetic fix: you still have to wonder about what is going on inside.
If you want to sleep at night, take it apart next time you haul out. You might consider replacing it with a PYI dripless shaft seal (no bronze) and worry about something else.