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.
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2.2L Engine Oiling System Description