BOARD 664-41134-A0

Function and technical context

The 664-41134-A0 gasket is a precision sealing element that works in the critical systems of Mercury and Yamaha marine engines, ensuring tightness between mating surfaces of the engine block, cylinder head or auxiliary systems. Its main function is to prevent leaks of coolant, oil or other operational fluids that circulate under pressure during the operation of the propeller. When this component degrades or loses elasticity, it allows fluids to leak into adjacent areas, causing pressure loss in lubrication and cooling circuits, local overheating of the engine, and in advanced cases, seawater entering internal cavities that compromises the structural reliability of vital mechanical components.

When to replace this part?

Engine gaskets gradually lose elasticity due to exposure to repeated thermal cycling, mechanical vibration and material aging; Typical symptoms include fluid stains on the crankcase, visible drips on the base of the engine, abnormal elevation of operating temperature, or slow loss of pressure in the lubrication circuit detected on a pressure gauge. It is recommended to check and replace preventively every 5-8 years of continuous use or after intensive navigation cycles, especially in engines that operate in hot climates or in high-altitude navigation. Early replacement of this gasket prevents costly repairs resulting from internal corrosion, cylinder seizure, or catastrophic failure of secondary seals at sea.

Mercury/MerCruiser

Equivalent manufacturer part numbers

This gasket is supplied from our logistics warehouse in Spain, with immediate availability and rapid distribution to the entire peninsula and archipelagos. We recommend having spare parts of this type in the emergency cabin during prolonged navigations.