YAMAHA 6G5-41112-A1 ENGINE COOLING GASKET

Function and technical context

This gasket integrates the engine cooling circuit, hermetically sealing the joints between the ducts through which the coolant circulates to the cylinders, cylinder head and engine block. Its sealing capacity is essential to maintain system pressure and ensure that the coolant flows uninterrupted to all areas that require thermal dissipation. When the gasket degrades or loses elasticity, leaks appear that break the pressure in the circuit, preventing the engine from reaching or maintaining the proper operating temperature. In high-performance Yamaha outboard engines, especially in saltwater environments, precise temperature regulation is critical to preserving the structural integrity of the engine block and preventing internal corrosion caused by saltwater penetration into unprotected cavities.

When to replace this part?

The most obvious indicators of failure in a cooling joint are visible leaks around the connection points of the cooling system, the progressive decrease in the coolant level without apparent cause, and the abnormal increase in engine temperature reflected in the indicator on the control panel or by activation of a thermal alarm. Although gaskets do not have a fixed replacement interval like filters, it is advisable to inspect them during each seasonal service, especially if the engine has been stopped for weeks or months. Replacing this gasket preventatively during maintenance work on the cooling system avoids emergency repairs in navigation and prolongs the useful life of the engine by ensuring optimal and consistent thermal dissipation.

Compatible Yamaha engines

Equivalent manufacturer part numbers