Generac Delco 55101 Lawn Tractor Stem Seal Valve OBS

The Generac Delco 55101 Lawn Tractor Stem Seal Valve OBS manages oil control around the stem by creating a sealing interface between the guide area and surrounding valvetrain components. As opening and closing cycles occur within the engine, the seal allows a measured amount of lubrication to remain in the assembly while limiting excess oil from reaching the combustion chamber. Found within the cylinder head assembly, it fits around the stem at the guide location. Continuous contact with the moving surface accommodates repeated motion while maintaining separation between adjoining engine areas throughout operation.