You mean to say that someone mounted a zinc on the propeller shaft, and it rubbed against the fibreglass until it wore through? Seems hard to believe that anyone would put up with the noise that would make long enough for it to wear through. That said, fibreglass can be repaired, but I think that you need to take a second real close look at what is going on first before proceeding further.
Does the rubber hose connecting the prop shaft tube to the stuffing box appear to be in good shape? Are the hose clamps intact? Stainless or not, they do corrode and break. Other than the hose clamps, the rubber tube itself is the weakest link. You are certain that the water is not coming from the packing and running back underneath? Is the boat out of the water? If the leak is not the packing itself then you will undoubtedly have to haul the boat to fix it properly, although you might get away with a temporary fix using urethane moisture cured sealant providing you find the leak's source. I just went through the process of removing the propeller shaft and replacing the stuffing box on my 36. It is not a task to be undertaken lightly, but failure of the stuffing box attachment to the prop shaft tube is not a trivial event. On that boat, a 2 1/2 year growth of barnacles and other marine accretions caused great friction between the stuffing box and the propeller shaft, and with a loud grinding noise the stuffing box and its rubber hose attachment broke free from the propeller shaft tube. The leak was sudden and considerable. Steve Thomas C&C27 MKIII Port Stanley, ON C&C36 Merritt Island, FL ----- Original Message ----- From: Jerome Tauber via CnC-List To: cnc-list@cnc-list.com Cc: Jerome Tauber Sent: Monday, June 06, 2016 06:22 Subject: Stus-List Propeller shaft tube leak I have a leak which appears to be coming from below the stuffing box from the shaft tube itself. Has anyone ever experienced this. Can the tube be repaired or does it have to be replaced. It appears that someone mounted a zinc on the tube and the tube wore through there. The engine is a Yanmar 1GM. Jerry J&J C&C 27V
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