Yamaha Outboard Internal Anodes

The recommended period for changing the anode in your hot water system is usually every 3 to 4 years. This will vary across different areas and applications. Alternatively, it can be replaced when half of it has been corroded. For Yamaha outboards, internal anodes are typically found in the Cylinder Crankcase parts diagram. Zinc is the traditional anode material because in the old days it was relatively easy to obtain through aluminum anodes are rapidly replacing zinc for use on all hull materials. Magnesium anodes are the most active and are the only anodes that work well in the low conductivity of freshwater. A sacrificial anode is an inexpensive piece of metal that is less noble than any other metal found on the boat. Bolting a sacrificial anode made from zinc, aluminum or magnesium (located near the top of the Galvanic Sequence) to the stainless prop shaft will protect a bronze prop from galvanic corrosion.