Abstract: A valve stem seal of an internal combustion engine is described wherein the valve stem seal includes an outer peripheral surface and an inner sealing surface. The inner sealing surface minimizes ingress of a liquid upwardly from an intake port area into an overhead engine area by having at least one sealing lip disposed on an upper portion of the inner sealing surface and extending away from the inner sealing surface. The sealing lip includes a generally square lower corner.

Abstract: A tool for grooving an outer surface of a valve guide comprising a tool body, a tightening nut disposed about a portion of the tool body, one or more rollers rotatably mounted within a bushing, and a handle for rotating the one or more rollers of the tool about the outer surface of the valve guide, wherein the tool is capable of grooving the outer surface of the valve guide while the cylinder head is mounted to an engine. The grooves on the outer surface of the valve guide allow the valve stem seal to grip the valve guide more effectively, thereby improving the retention force on the valve guide. As a result, the movement of the valve stem seal is minimized. A method of using the tool is also described.

Abstract: A valve stem seal assembly includes a retainer and a sealing element disposed within the retainer. The retainer includes a step and one or more installation pads. The sealing element includes a first sealing lip for sealing a valve stem, and a second sealing lip for sealing a chamfer of a valve guide. The step of the retainer exerts a compression force, F, against the second sealing lip to seal the second sealing lip against the chamber of the valve guide. The one or more installation pads exerts a frictional force against the valve guide to prevent movement of said valve stem seal assembly. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).