YAMAHA ANODE 150-200HP

Function and technical context

The sacrificial anode protects against galvanic corrosion in Yamaha outboard motors from 150 to 200 hp, acting as an electrochemical barrier in areas of the engine exposed to salt water. Made of less noble material than the aluminum and steel of the engine block, the anode oxidizes preferentially and in a controlled manner, consuming strategically to preserve the structural integrity of the propulsion system. This methodical culling mechanism prevents the formation of red rust in cylinder heads, blocks and internal cooling systems, where corrosion could compromise critical cast aluminum components that are difficult to recover once degraded.

When to replace this part?

The anode requires visual inspection at each change of boating season, especially if the engine has operated in salt or brackish waters, where electrochemical activity is intensified. A 50% reduction in volume or the appearance of surface cracks are clear indicators of exhaustion; Replacing the anode preventively before its total consumption eliminates the risk of accelerated corrosion in internal components, avoiding costly repairs and unscheduled stops during the navigation season.

Equivalent manufacturer part numbers