Abstract: An alignment feature for preventing in-bore rotation of an engine tappet. A first portion extends outwards from a tappet and a second portion extends into a hole in the tappet. The first portion extends longitudinally past the mounting hole such that when the feature and tappet are installed in an engine bore, the entire feature is prevented from rotation within the hole. The second portion extending orthogonally from the first portion into the mounting hole need not be close-fitting to the hole. The first portion may be substantially semi-cylindrical, having a convex cylindrical outer surface for fitting the walls of a semi-cylindrical channel in the engine bore and a concave cylindrical inner surface for fitting the outer wall of the tappet. The pin portion is preferably cylindrical. Other pin shapes are possible. The alignment feature may or may not be hardened.

Abstract: A process for forming a roller bearing comprising the steps of providing a cylindrical slug that comprises at least 0.7 weight percent carbon and up to 1.6 weight percent of at least one alloying element. The slug has lateral and side surfaces. A centered indentation is formed in each side surface. A circular chamfer surface is formed at the intersection of each side and each lateral surface, thereby producing an upsetting slug. The upsetting slug is cold formed, thereby deepening the centered indentations and forming a blank. The blank has a web separating the deepened indentations and end surfaces and chamfer surfaces that are substantially at net shape for the roller bearing. The web is removed from the blank, thereby forming a pierced blank having a through hole with an inner surface. The inner and lateral surfaces of the pierced blank are finished to the specified inner and outer diameters for the roller bearing.