2585391 - Introduction - ENGINE LUBRICATION SYSTEM

Engine oil supply circuit

The engine oil supply circuit is shown in the following figure.1, Suction pipe with filter mesh2, Oil pump3, Oil filter cartridge4, Main longitudinal duct5, Jets (piston skirt cooling)6, Vertical duct (camshaft support lubrication)7, Oil return to the sump8, Switch for engine oil pressure warning light

Engine oil pump

The engine oil is drawn in from the sump by means of the vacuum built up by the rotation of the gears fitted on the crankshaft.Vacuum is present between the gear partition (2) and the oil sump suction pipe.Pressure instead develops after the separating wall (2) in all the oil delivery pipes (4).When the pressure exceeds 5 bar, the force exerted on the limiting valve (5) overcomes the reaction of the spring below and moves the valve to open the connecting pipe between the pressure chamber (3) and the low pressure chamber (1).1, Low pressure chamber2, Separating wall3, Pressure chamber4, Oil delivery pipe5, Pressure limiting valve

Closed operating position of oil pressure limiting valve.

The figure shows the valve in closed position.

Bypass operating position of limiting valve.

The figure shows the valve in open position.