Full oil pressure lubrication, through a full-flow oil filter is supplied by a
gear-type oil pump. Oil is drawn up through the oil pump screen and
passes through the pump to the oil filter. The oil filter is a full-flow paper
element unit with an anti-drain back valve. An oil filter bypass valve is
used to ensure adequate oil supply, in the event the filter becomes
plugged or develops excessive pressure drop. Filtered oil flows into the
main gallery and then to the camshaft, the balance shaft, the rear
bearing, and the crankshaft bearings. The valve lifter oil gallery supplies
oil to the valve lifters. Oil flows from the valve lifters through the hollow
valve pushrods to the valve rocker arms. Oil drains back to the
crankcase through the oil drain holes in the cylinder head. The camshaft
timing chain is drip fed from the front camshaft bearing. The pistons and
piston pins are lubricated by oil splash.
2.2 L 4 cylinder oil and lubrication system