Abstract: A pump actuator for use between a cam and a pump comprises a pump actuator body having a pad defined between a plunger facing surface and an opposite roller facing surface, where the plunger facing surface is recessed into the pump actuator body and offset from a radial end. The pump actuator body further comprises a cylindrical wall defined between the radial end and the plunger facing surface. A concave surface feature is formed on the pad on its plunger facing surface. The opposite roller facing surface of the pad is provided with a surface enhancing treatment comprising shot peening. These features, separately or in combination, provide mass-neutral improvements of the pump actuator body's fatigue life.

Abstract: A method of cold forming an outer arm of a rocker arm assembly in a cold forming machine includes providing a slug having a first end and a second end, extruding the slug at the first end to establish two different widths of the slug, compressing the slug to form an upper angled surface and a lower angled surface at the second end, and compressing the slug to form an inner arm window defined by a pair of side walls and a pair of end walls.