The images depicted are Sacrificial Anodes, "old vs new" in the image. These parts are designed to degrade over time but need to be replaced before they're completely gone. They are often forgotten parts that won't affect the performance of your boat but will affect the longevity of your boat parts that are in the water.
Boats that are kept in a marina are more susceptible to electrolysis rather than boats that are stored out of the water. The reason this happens is because there is stray electricity in the water. The stray electricity is what consumes the anodes. If these parts are not corrected, it will start to affect the drive in your boat and the overall lifespan of your boat parts.
Anodes vary between fresh water and salt water. The pictures below are freshwater anodes that are made of magnesium, whereas saltwater anodes would be made of zinc.
Anodes should be replaced on an as-needed basis. Once your anodes start to look like these images, it's a good time to change them. Don't wait until they're completely gone. It's important for you to trust your boat mechanic to inspect and keep a detailed eye for the overall quality of your boat's lifespan. Not limited to anodes.
At Professional Marine, we have over 60 years of combined boat mechanic experience. We are a Full Service Marine Center. Call us with any help you may need 208-964 2431 or visit our website at www.professionalmarine.com
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