Yamaha Cylinder Crankcase Zinc Anode 68V-11325-02-00. Overview. The Yamaha 68V-11325-02-00 Cylinder Crankcase Zinc Anode is a genuine OEM corrosion protection component designed to help protect internal engine components from galvanic corrosion. Installed within the engine's cooling system, this sacrificial anode helps prevent corrosion damage to critical aluminum engine parts by attracting corrosive elements first.. In marine environments, electrolysis and galvanic corrosion can gradually damag