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Zinc problem Volvo Sail Drive
I installed a galvanic isolator to protect my saildrives/zincs, and I
believe it works. I have heard of someone w/ a saildrive who installed a battery disconnect switch in the ground cable to the engine , which he switched off when docked or even anchored. Seems to me this is a good idea, but I'd like to hear what others think of this. "claus" wrote in message ... We have a Volvo MD22L engine equipped with a sail drive. The hull and prop are "supposed to be" protected with: 1) A Large Zinc block attached to the hull just forward of the sail drive and electrically connected to the engine block through the hull. 2) Round Zinc around the propellor shaft - attached to the sail drive 3) 3 small Zincs attached directly to the propellor The problem is that the 3 small zincs erode rapidly - sometimes within 2 months - and sometimes within 4 months...no regular pattern. The other zincs (1 and 2) look brand new after 2 years in the water and obviously do not protect the propellor at all. When the all the zincs were installed at the last haul-out 2 years ago I made sure they were free of any surface oxidation. I have also installed a Galvanic Isolator in an attempt to alleviate the problem - and the boat has been inspected for any stray currents and none found by the Marina staff. The boat next two ours is a derilict without any maintenance whatsoever - but is is also hoohed up to the same shorepower circuit as ours. The Marina staff dioes not think that is the culprit. Any suggestions? cvj |
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