WASHER 16140 PAF8-04000012

Function and technical context

This precision washer plays a critical role in securing and distributing loads on Mercury, Mariner, MerCruiser, OMC, Parsun and Tohatsu marine propulsion systems. As a fixing component, it acts as a support element under screw heads or nuts, preventing pressure from concentrating on a single point and preventing the fastener from sinking into softer materials such as aluminum or reinforced plastics. Its dimensional accuracy ensures correct alignment on critical engine assemblies, where any misalignment or play could compromise the structural integrity of cylinder blocks, crankcases, and internal cooling systems. Wear or corrosion of this part can allow progressive loosening that results in coolant leaks, loss of tightness in joints, or abnormal vibration during operation.

When to replace this part?

Although precision washers have a long life, they should be replaced when visible corrosion, permanent deformation, or microscopic cracks are observed after engine disassembly. During seasonal maintenance checks, especially after wintering or periods of prolonged storage in saline environments, it is advisable to inspect all washers in critical connections and replace those that show signs of advanced rust or loss of flatness. Performing this preventive replacement routinely in major dismantling work (change of cylinder head gaskets, repair of crankcases) avoids costly future repairs caused by leaks or misalignments that compromise the reliability of the propeller in navigation.

Engine Compatibility

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers