BOARD 27-853523

Function and technical context

Gasket 27-853523 is a critical sealing component that ensures tightness at the joint between the cylinder head and engine block. This part works in the cooling circuit and in the lubrication system, supporting high pressures and temperatures during the operation of the propeller. Its deterioration allows refrigerant and oil to leak, compromising the thermal dissipation capacity and causing overheating, loss of power and irreversible internal damage to cylinders and liners.

When to replace this part?

Head gaskets show signs of aging when visible coolant or oil leaks appear at the cylinder junction, when the engine experiences recurrent overheating without apparent cause, or when the presence of water is detected in the crankcase. It is recommended to inspect its condition at each seasonal inspection and replace it preventively if the engine has accumulated more than 1,000-1,500 hours of operation or has remained inactive for several years. Making the change preventively is the best investment to avoid complex repairs at sea.

Mercury and Mariner Engine Compatibility

Mercury/MerCruiser

Equivalent manufacturer part numbers