SURFACE TREATMENT OF PREFINISHED VALVE SEAT INSERTS

摘要

A method of manufacturing surface treated, prefinished valve seat inserts (10). The method entails forming the valve seat insert (10), precision machining the valve seat insert to precise tolerances so that the valve seat insert can be installed in one of the cylinder head and the engine block without the need for additional seat machining and treating the valve seat insert with a wear resistant treatment prior to inserting the valve seat insert (10) into one of the cylinder head and the engine block. The valve seat insert may be surface treated by a variety of methods including ferritic nitrocarburizing.