Abstract: A cam actuated fuel injector is assembled by engaging an internal thread of a tappet with an external thread of an injector body. The tappet is then rotated with respect to the injector body about a centerline until the internal thread disengages the external thread so that the tappet is then slidable along the centerline. The tappet is biased toward a pre-installation position in which the external thread contacts the internal thread. After installation, the respective internal and external threads guide the sliding movement interaction between the tappet and the injector body when the fuel injector is operational.

Abstract: A cam actuated fuel injector is assembled by engaging an internal thread of a tappet with an external thread of an injector body. The tappet is then rotated with respect to the injector body about a centerline until the internal thread disengages the external thread so that the tappet is then slidable along the centerline. The tappet is biased toward a pre-installation position in which the external thread contacts the internal thread. After installation, the respective internal and external threads guide the sliding movement interaction between the tappet and the injector body when the fuel injector is operational.

Abstract: A tool is provided. The tool includes a handle, a base, and a plurality of members. The base is attached to the handle. The plurality of members is affixed to the base at one end. Each of the plurality of members is capable of movement in a substantially lateral direction. Further, the plurality of members is configured to change a diameter of a snap ring from a first diameter to a second diameter based on the movement.