MERCURY RUDDER ANODE 31640T07

Function and technical context

The rudder anode is a passive cathodic protection component installed on the rudder blade of Mercury outboard engines. Its function is to sacrifice itself electrochemically to prevent galvanic corrosion of the steel and aluminum that make up the rudder structure when the engine is in permanent contact with salt or brackish water. By preferentially oxidizing the anode rather than the base metal of the rudder, structural degradation that would compromise the maneuverability and integrity of the steering system is avoided. This component is essential in vessels that operate in marine waters, where corrosion processes significantly accelerate the wear of metal parts.

When to replace this part?

The rudder anode requires periodic replacement upon completing its sacrificial cycle, generally at the end of each navigation season or when it shows visible wear greater than 50% of its mass. Indirect symptoms of anode depletion include the appearance of corrosion spotting on the rudder, areas of surface rust, or color changes indicating active oxidation of the base metal. The preventive inspection in each seasonal maintenance allows the wear of the anode to be detected in time and replaced before corrosion affects the rudder, avoiding costly repairs and guaranteeing the safety of the steering during navigation.

Engine Compatibility

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers