Patent ID: 6209504
Filing Date: 2001-04-03
Classification: F01L

Abstract:
In a valve assembly of a heavy-duty engine, an integral valve stem seal subassembly comprising:a reduced diameter valve spring;a one-piece unitary metal annular valve seal retainer including upper and lower annular portions, wherein the inner diameter of said upper portion is less than the inner diameter of said lower portion, said lower portion axially extending to a height above a top portion of a valve guide, a flange extending radially outwardly of said lower portion for engaging at least one coil of said reduced diameter valve spring; andan annular sealing member having upper and lower seals, said sealing member bonded to said retainer upper portion, said upper seal including an inner circumferential surface for sealing engagement with an outer surface of a valve stem, said lower seal including a frustoconical end extending axially from said upper seal to contact said top portion of said valve guide.