Abstract: For an overhead camshaft type internal combustion engine, a valve lash adjustment system and apparatus using a sliding wedge for adjusting a bearing support for a journal of the camshaft thus moving the camshaft itself relative to a valve.

Abstract: In an internal combustion engine with overhead valve and overhead cam type valve gear, a self-pumping hydraulic-type lash adjuster located downward from the lubricated camshaft and supplied by oil run-off from the camshaft and associated rocker arm member. The lash adjuster includes a housing with a cylindrical aperture therein in which a first plunger member is tightly slidably fitted for reciprocation forming a power chamber with the lower end of the housing. A second plunger member is relatively loosely fitted in the aperture of the housing and has a portion extending from the upper end of the housing for receiving force inputs from the rotating camshaft and associated rocker arm member. A reservoir chamber is formed by the first and second plunger members and is communicated by one-way check valve means to the power chamber to permit flow from the reservoir to the power chamber, but not otherwise.

Abstract: An improved oiling apparatus for the camshaft lobes of an engine. The bearing portion of the camshaft is supported within a bore between an upper bearing cap member and a lower cylinder head member. Oil passage means extend from a source of pressurized oil through the upper and lower members and intersect or open to the bore at circumferentially spaced locations. The passage openings are interconnected during a portion of the camshaft rotation by a closed-ended groove in the camshaft bearing portion. A small opening or orifice in the cap member communicates with the oil passage and its axis is orientated slightly from normal to the surface of the cap member so as to direct a fine stream of oil onto an active surface of the nearby camshaft lobe. The small hole or orifice opening is drilled through the cap member from a recessed surface established substantially flat and normal to the intended axis of the orifice opening.