CIRCLIP 40-825017 PAF25-05020106

Function and technical context

The circlip 40-825017 PAF25-05020106 is a safety retainer that acts as a fastening element in transmission and coupling systems of marine engines. This part retains internal components of the engine, preventing unwanted axial displacements under the conditions of vibration and mechanical stress inherent to operation in a marine environment. Its function is critical in the engine's kinematic chain, since any relative movement of the components it secures could cause misalignment of the drive shaft, loss of power or, in serious cases, engine blockage.

When to replace this part?

Circlips can lose elasticity after years of operation exposed to thermal cycles and continuous vibrations, allowing the component they secure to shift. If during winter maintenance you detect looseness in the shaft coupling, or if you notice that the circlip shows residual deformation or microscopic fractures, it is time to replace it. It is recommended to include the visual inspection of this seal in each seasonal inspection, especially on boats with a high number of sailing hours, since its preventive replacement is economical compared to a transmission repair while sailing.

Mercury and Parsun engine compatibility

Mercury/MerCruiser

Equivalent manufacturer part numbers