Section 2 (2.4L Engine (Service Information)): Lubrication: Operation

Engine oil is drawn up through the pickup tube, pressurized by the oil pump and routed through the full-flow filter to the main oil gallery running the length of the cylinder block. A diagonal hole in each bulkhead feeds oil to each main bearing. Drilled passages within the crankshaft route oil from the main bearing journals to the connecting rod journals. Balance shaft lubrication is provided through an internal oil passage at the #3 bearing location around the Balance Shaft Module (BSM) mounting bolt. A vertical hole at the number one bulkhead routes pressurized oil through a filter screen and head gasket up to the cylinder head. The oil then divides into two passages; one to the Variable Valve Actuator Assembly (VVAA) and one to the exhaust camshaft. The passage to the camshaft feeds the hollow exhaust camshaft at the second cam journal. The rest of the cam journals are fed oil through the hollow camshaft. Oil returning to the pan from pressurized components supplies lubrication to the valve stems, cam lobes, and tappets. Cylinder bores and wrist pins are splash lubricated from directed slots on the connecting rod thrust collars.