ARNESSON WASHER

Function and technical context

The Arnesson washer acts as a sealing and load distribution element at the connection and tightening points of the Arnesson transmission, a highly efficient surface propulsion system used in fast and competition boats. Its purpose is to ensure that the clamping forces are distributed evenly over the contact surfaces, avoiding deformations, marks or microcracks in the adjacent structural components. Within a propulsion system as demanding as the Arnesson, where dynamic loads and vibrations are high, a washer in poor condition compromises the integrity of the tightening and can lead to looseness, loss of adjustment or even damage to higher-cost components. Keeping all fastening elements, including washers, in perfect condition is essential to preserve the performance and reliability of the drive assembly.

When to replace this part?

Surface propulsion system washers should be inspected at each seasonal maintenance intervention, as galvanic corrosion, fatigue deformation or progressive crushing of the material are the main failure modes in marine environments. The most common symptoms are the appearance of looseness at the tightening point, abnormal noises or vibrations in the transmission and the presence of corrosion marks or visible deformation on the washer itself. Preventively replacing this element at each annual check is a low-cost measure that prevents unforeseen loosening and major breakdowns in transmission components during navigation.

Compatibility