YAMAHA WASHER 63P-45987-0000 REC6E5-45987-00

Function and technical context

This washer is part of the fastening and sealing components of the Yamaha engine, working in the cylinder head and block body assembly system. Its function is to distribute the tightening pressure of the fixing screws evenly, preventing the fixing head from sinking into soft materials and guaranteeing a watertight joint. A deterioration or absence of this washer compromises the integrity of the engine's internal seals, potentially causing coolant leaks, water entering the combustion chambers and loss of compression in the cylinders.

When to replace this part?

The washers should be inspected during each seasonal maintenance check, especially after removing the cylinder head or crankcase for cleaning or valve adjustment. If you notice deformation, permanent crushing, severe rust or galvanic corrosion marks on the surface, it is time to replace it. Preventively replacing washers during major disassembly avoids costly repairs due to fluid leaks while boating and ensures proper sealing of critical joints.

Equivalent manufacturer part numbers