Engine Lubrication: Description and Operation

Lubrication System






The oil lubrication system is a full flow filtration, pressure feed type. The oil pump body (7) is mounted to the engine block. The pump inner rotor (3) is driven by the crankshaft (1). A windage tray, increases engine power by minimizing oil windage at high engine RPMs. For increased engine oil cooling, an engine oil to engine coolant oil cooler is used.

Engine oil stored in the oil pan is drawn in and discharged by a gerotor type oil pump. The oil pump is directly coupled to the crankshaft. Oil pressure is regulated by a relief valve. The oil is fed through an oil filter and to the crankshaft journals from the oil gallery in the cylinder block. This gallery also feeds oil under pressure to the cylinder heads. Oil flows through each cylinder heads oil passage to the rocker shafts. Oil then feeds the camshaft journals, rocker arms, and hydraulic lash adjusters.






The engine oil cooler (2) is a coolant to oil type and is mounted between the oil filter (3) and the oil pan.

The engine oil travels from the oil cooler (3) and into the oil filter (3). Engine oil then exits the filter (3) into the main gallery. Engine coolant flows into the cooler from the heater return tube and exits into the water inlet tube.