Engine valve actuation system and lifter arm assembly having lifter arm oil spray port for cam-roller lubrication

An engine valve actuation system (20) includes a rotatable camshaft (22) having a cam lobe (23), and a lifter arm assembly (24) having a lifter arm (26) with a roller (34) in contact with the cam lobe (23). A bushing (54) is positioned in a pin bore (50) of the lifter arm (26) and journals the lifter arm (26) upon the pin (52) for reciprocation in response to rotation of the camshaft (22). An incoming oil passage (58) extends to the pin bore (50), and an outgoing oil passage (64) extends from the pin bore (50). The outgoing oil passage (64) forms an oil spray port (68) defining an oil spray path (70) oriented to direct a spray of oil at the roller (34) and/or the cam lobe (23). An oil feed groove (72) is formed in at least one of the lifter arm (26) or the bushing (54) and fluidly connects the incoming oil passage (58) to the outgoing oil passage (64).