The oil filter element is located separately from the cylinder block.
Passing through the oil filter, the purified oil enters the main oil line. It has an emergency oil pressure drop sensor, which, by turning on the warning lamp in the instrument cluster, signals low oil pressure. The oil filter has a bypass valve, through which, in the event of severe contamination of the filter, crude oil enters directly into the oil line.
From the main line, oil under pressure is supplied through the channels to lubricate the main bearings of the crankshaft and then through the channels in the crankshaft to the connecting rod bearings. To cool the pistons, oil is sprayed through nozzles onto the bottom of the pistons.
Through the channels, oil is supplied to the cylinder head for lubrication of the camshaft bearings and to the hydraulic tappets.
Pic. 3.90. Oil pump: 1 - oil pump; 2 - crankshaft; 3 - inner rotor of the oil pump; 4 - external rotor of the oil pump; A - flats on the oil pump drive shaft
The internal gear oil pump is installed in the front cover and is driven by two flats (pic. 3.90).