VALVE SEAL ASSEMBLY WITH BOTTOM FLANGE SEAL

摘要

A valve stem seal assembly includes an elastomeric sealing member for sealing between a reciprocally moveable valve stem and an associated valve guide in an internal combustion engine. The assembly includes a cylindrical retainer that incorporates an end wall at a first end thereof for securing the elastomeric sealing member to the retainer. The valve assembly is installed over the valve guide , and the retainer is adapted for frictional securement to the guide, whereas the retainer extends down to and engages the surface or deck of the associated engine cylinder head. The retainer includes a radially extending bottom flange at a second end opposit e the end wall, wherein the flange bears directly against the cylinder head deck. The upper surface of the flange provides a bearing surface fox valve return springs, while the bottom surface of the flange includes an elastomeric sealing media bonded thereto. The sealing media assures positive sealing against oil leakage between the valve guide and the cylinder head deck.