YAMAHA GASKET 6AH-11351-00

Function and technical context

This gasket is part of the critical sealing system in Yamaha outboard motors, guaranteeing tightness in fluid passage areas or joints between components of the engine block. Its mission is to prevent salt water, coolant or oil leaks that could compromise the structural integrity of the engine and cause accelerated internal corrosion. Working in an environment of constant vibration and thermal variations typical of marine navigation, this gasket must maintain its elasticity and sealing capacity under pressure for years of continuous operation. A failure in its performance results in the entry of humidity, oxidation of internal parts and progressive loss of airtightness in areas that require absolute isolation from the saline environment.

When to replace this part?

Marine engine gaskets should be inspected during each seasonal inspection and replaced preventively every 3-4 years or when hardening, discoloration, microscopic cracks or visible loss of elasticity when pressed is evident. Symptoms of deterioration include moisture in the gasket area, rust spots around the seal, or an abnormal increase in coolant consumption without an apparent leak. Replacing this gasket proactively during maintenance tasks avoids costly repairs resulting from water infiltration that compromises cylinders, crankshaft or cooling systems on prolonged voyages.

Yamaha Engine Compatibility Chart

Equivalent manufacturer part numbers