OMC 982277 Anode

Function and Technical Context

The sacrificial anode 982277 protects the submerged metal components of Johnson and Evinrude outboard motors against galvanic corrosion, one of the primary enemies of marine machinery in saltwater and brackish environments. Manufactured from high-purity zinc alloy, this component acts as the negative electrode of the galvanic cell formed between the different metals in the motor and the water, sacrificing itself to preserve the integrity of critical parts such as the motor housing, propeller, and drive shaft. The OMC reference 982277 corresponds to the ground plate of the cathodic protection circuit, whose function extends beyond simple anticorrosion protection: it also ensures proper electrical continuity of the entire propulsion unit. Without this component in good working condition, galvanic corrosion can irreversibly damage structural motor components in a single season, especially in saltwater areas.

When to Replace this Component?

Sacrificial anodes should be inspected at least once per season and replaced when they have lost between 50% and 75% of their mass, without waiting for them to be completely consumed, as an depleted anode leaves the motor's metal components unprotected. If an intense whitish discoloration, surface cracks, or evident reduction in anode volume are observed, this is a clear indication that replacement is immediate. The standard practice among marine mechanics is to renew all anodes during end-of-season haul-out: a preventive practice that avoids costly repairs due to corrosion in the transmission or lower motor housing.

Compatible Johnson/Evinrude Engines

Equivalent Manufacturer References