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zinc anode

  1. Volvo Penta 2002, MS 2B, yr 1991 zinc

    I have a "new to me", 4 months ago, Volvo Penta 18 hp. It is fresh water cooled with a heat exchanger and anti-freeze circulation. I'm trying to determine if the "zinc plug" on the top front of the engine, about 7/8ish socket, should have a zinc? It doesnt have a fitting on the back. I'm in a...