YAMAHA MANIFOLD GASKET 61A-13621-A0

Function and technical context

The manifold gasket is a critical sealing element in the exhaust system of Yamaha outboard engines. This piece is placed between the exhaust manifold and the engine block, guaranteeing a hermetic seal that prevents the entry of salt water and the leakage of exhaust gases into the crankcase. Its function is essential to maintain the integrity of the water cooling system and prevent internal corrosion caused by seawater infiltration into the combustion chambers and adjacent areas. A failure in this gasket compromises the tightness of the engine, which can lead to water entry, loss of effective cooling and accelerated deterioration of internal components.

When to replace this part?

The manifold gaskets present characteristic signs of wear such as visible water leaks around the area where the manifold and block join, engine overheating without apparent cause in the cooling circuit, or water entering the crankcase detectable using the oil dipstick. Although there is no specific operating hour interval, it is recommended to check the tightness of this joint during each seasonal maintenance, especially after prolonged periods of navigation in salt water or after detecting corrosion in adjacent areas. Replacing the gasket preventively during major maintenance works avoids costly repairs resulting from widespread engine rust.

Equivalent manufacturer part numbers