ZINC ANODE YAMAHA 300-350 6AW-45373-00

Function and technical context

The zinc anode is a sacrificial part that protects metal engine components against galvanic corrosion in marine environments. Installed in the engine block or in areas of direct contact with salt water, it acts as an electrochemical barrier, absorbing oxidation that would otherwise damage cylinder heads, cooling pipes and internal engine surfaces. In Yamaha engines from 300 to 350 horsepower, this protection is critical to maintain the structural integrity of the cooling system and avoid leaks, power losses or unexpected stops while sailing.

When to replace this part?

The zinc anode should be replaced when it shows visible wear, advanced corrosion, or has significantly reduced in size. It is advisable to inspect and replace the anode at the end of each boating season or every 200-300 hours of operation, depending on the salinity of the water and the intensity of use. Replacing it preventatively prevents corrosion from reaching expensive structural components and ensures optimal performance of the cooling system all season long.

Equivalent manufacturer part numbers