Lubrication System: Notes

The engine lubrication system operates as follows:

• Oil is drawn into the oil pump through the oil pump screen cover and tube in the sump of the oil pan.
• Oil is pumped through the oil filter adaptor on the left side of the cylinder block, through the filter the oil cooler and back through the adaptor to the cylinder block.
• Oil enters the cylinder block and is fed to the cylinder block main gallery where it is distributed to the crankshaft main journals, piston oil coolers and to both cylinder heads.
• From the main journals, the oil is routed through cross-drilled passages in the crankshaft to lubricate the connecting rod bearings.
• Oil enters the cylinder heads from the passages in the front of the cylinder block and full oil pressure is fed to the timing chain tensioner, rocker shafts and camshaft phasers. Oil pressure that is fed to the camshaft bearings is reduced through a restrictor plug that is pressed into the cylinder head oil passage.
• Oil enters the rocker arm shafts which are hollow and feeds oil to the rocker arms. The rocker arms have passages to send oil to the lash adjusters and to lubricate the cam lobes and camshaft rocker arm rollers.