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  1. S

    Seawater cooling turns dark at high revs

    when my d30 sail drive runs at revs over 2000rpm the water coming out the hull turns a dark grey. I have two engines as is a catamaran but the engine that has discoloration problem at high revs will not rev as high as the other engine at revs lower than 2000 the water is clear. It seems to run...
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