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Old 05-06-2013
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Re: Raymarine ST40 speed transducer nearly sunk me

try removing the transducer and putting the plug in and see if that stops the leak. If not, then take the plug out and put the palm of your hand over the hole with moderate pressure and look for leaks on the sides of the fitting. If water is weeping out of the sidewall you know it's cracked.

When I installed mine I put a thick layer of Sikaflex on the flange and threads where the fitting goes through the hull. Then I loosely tightened it so the sikaflex would form a gasket between the fitting and the hull. Once set I then tightened the fitting further. If you did not use sealant I would suggest hauling the boat, removing the fitting and doing something similar.

Last edited by KeelHaulin; 05-06-2013 at 03:26 PM.
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