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Take off the gasket from the cover flange or cylinder head , noting how it is attached. Some gaskets have tongues that fit cutouts in the flange; others are stuck to the flange with sealant ; some just fit into the flange groove .

Typically used in hydraulic high-stress applications where compounds under high pressure are exposed to wear, the benefits of polyurethane seals include: 

Operating conditions such as the engine’s temperature, position, size, pressure and shaft speed largely determine which individual oil seal composition is most suitable for every individual application.