Adjustable lash valve train for overhead valve engine.

摘要

An adjustable valve lash train for an overhead valve engine includes a rocker arm stud (84) having a threaded shank (86) received in a correspondingly threaded bore (88) in said cylinder head (12). The rocker arm stud includes an integral head (94) having a spherically shaped bearing surface (96) on the undersurface thereof in engagement with a correspondingly shaped bearing surface (129) on the rocker arm (82). The head of the rocker arm stud includes a hexagonally shaped recess (98) in the top surface (100) thereof for receipt of an adjustment tool. A threaded jam nut (90) is received about the threaded shank of the rocker arm stud for selectively locking the threaded shank against rotation with respect to the threaded bore of the cylinder head. A push rod guide plate (92) is sandwiched between the cylinder head and the jam nut adjacent the shank of the rocker arm stud for controlling lateral displacement of a push rod (108).