ANODE BUKH TAIL

Function and technical context

The tail anode is the key component of the cathodic protection system in outboard motors and drivetrains, acting as a sacrificial electrode to preserve submerged metal parts against galvanic corrosion. Made of zinc or aluminum alloy depending on the boating environment, it is installed in the outer tail section of the engine, where continuous exposure to salt, brackish or fresh water causes aggressive electrochemical processes. Its function is to "sacrifice" itself by corroding in a controlled manner before the structural parts of the propeller, shaft or gearbox do so. If the anode is completely depleted without being replaced, galvanic corrosion directly attacks the most valuable metal components, potentially causing irreversible damage to the tail of the Bukh engine and compromising the structural integrity of the transmission.

When to replace this part?

The clearest sign that the tail anode needs to be replaced is when it has lost more than 50% of its mass through erosion or has an irregular, whitish, friable surface indicating depletion of the active alloy. The standard recommendation in nautical maintenance is to inspect and replace the anode at least once a season or every time the boat is taken out of the water for stranding, regardless of the number of hours sailed, since the corrosion rate also depends on salinity, parasitic electrical currents and the presence of dissimilar metals in the hull. Preventively replacing the tail anode TEN02051 at the beginning of each campaign is the most economical measure to avoid a costly repair of the tail or propeller shaft in the middle of the sailing season.

Compatibility table