Patent ID: 7086360

Claim:
A mounting and anti-rotation device for roller tappets of a valve train of an internal combustion engine comprising at least two roller tappets comprising a substantially cylindrical tappet body and a roller mounted at one end to bear against an outer periphery of a cam of camshaft for being axially displaced by the cam, said tappet body comprising on an outer peripheral surface at an upper end oriented away from the roller, a dihedron formed by two parallel flat surfaces, said mounting and anti-rotation device (mounting aid) being adapted for attachment to an engine block and comprising receptions arranged behind one another for receiving the end of the outer peripheral surface of the roller tappets oriented away from the roller, an inner profile of the receptions being matched to an outer profile of the dihedron, wherein first and second roller tappets comprising dihedrons having different widths across flats are used, the dihedrons of one of the first roller tappets or second roller tappets being configured asymmetric to a longitudinal axis of respective said tappets and therefore possessing one long and one short flat surface constituting a long and a short anti-rotation surfaces, the mounting aid comprising first and second receptions that are configured so that the first roller tappets can only be inserted into the first receptions and the second roller tappets can only be inserted into the second receptions.