Operation

OPERATION

Engine oil is drawn up through the pickup screen and is pressurized by the oil pump and routed through the oil 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. The main oil gallery also feeds oil pressure to the timing chain tensioner. A vertical hole at the number one bulkhead routes pressurized oil through a filter up into the cylinder head. The oil then divides into three passages; one to the intake cam phaser, one to the exhaust cam phaser and one to the camshafts. The passage to the camshafts divides to feed both of the hollow camshafts at the second cam journal.The rest of cam journals are feed oil through the hollow camshafts. The #1 cam journals are feed oil through the VVT oil passages. Oil passages to the phasers are directed through the OCV (oil control valves) to the #1 journals. The oil then flows through the camshafts then to the cam phasers. 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.