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INSTALLATION & OPERATION MANUAL U125 Series Engines CHAPTER 11 ANTI CORROSION SYSTEM Heat exchanger Sacrificial anodes A sacrificial anode must be replaced when more than 60% of it has been used. Check especially frequently when used in saltwater. It is recommended to replace the sacrificial anodes at the start of each season. CAUTION ! •DON’T OPERATE ENGINE WITHOUT ANODES. IT IS HARMFUL TO YOUR ENGINE. •CLOSE THE SEAWATER VALVE BEFORE THIS MAINTENANCE. • MAKE SURE TO CHECK THE ANODE PLUG IN ACCORDANCE WITH THIS MANUAL: DON’T LOOSEN COOLANT DRAIN PLUG. -59-