Abstract: An MLS combustion cylinder head gasket includes a relatively thick soft metal stopper having a square nosed aperture edge adapted to face a flame front in a cylinder head bore. The square nosed edge is designed to eliminate the trapping of hydrocarbons, which creates a major source of emission issues. The soft metal stopper is preferably formed of copper, although other soft metals capable of withstanding high temperatures may be employed. The stopper is formed of a malleable metal ring, and is formed over and about the edge of a combustion aperture edge of the gasket via a forming die that both shapes and clinches the metal ring respectively about and to the circumferential edge of each combustion aperture. The stopper, applied to the center spacer layer of the gasket, is adapted to flow into crevices and to thus “conform” to the normally variable spacing between engine block and cylinder head.

Abstract: An MLS combustion cylinder head gasket includes a relatively thick soft metal stopper having a square nosed aperture edge adapted to face a flame front in a cylinder head bore. The square nosed edge is designed to eliminate the trapping of hydrocarbons, which creates a major source of emission issues. The soft metal stopper is preferably formed of copper, although other soft metals capable of withstanding high temperatures may be employed. The stopper is formed of a malleable metal ring, and is formed over and about the edge of a combustion aperture edge of the gasket via a forming die that both shapes and clinches the metal ring respectively about and to the circumferential edge of each combustion aperture The stopper, applied to the center spacer layer of the gasket, is adapted to flow into crevices and to thus “conform” to the normally variable spacing between engine block and cylinder head.

Abstract: A shaft seal includes a rigid case and an elastomeric seal body affixed thereto. The seal body member includes a primary sealing lip and a secondary sealing lip axially spaced from one another by an intermediate flex section. The sealing surfaces of both sealing lips are lined with a singular piece of low friction material in the form of a single annular wafer having radially inner and outer liner portions covering the primary and secondary sealing lips. The wafer is formed with a weakened material section intermediate the inner and outer annular liner portions for increasing the flexibility and independent operation of each sealing lip.