The pump sucks oil from the engine oil sump through an oil receiver with a mesh filter and through a full-flow oil filter with a filter element made of porous paper feeds it into the main oil line located in the cylinder block body on the left side. Channels for supplying oil to the crankshaft main bearings branch off from the main line. Oil is supplied to the connecting rod bearings through channels made in the crankshaft body, and then through channels in the connecting rod rods to holes in their upper part, through which it is sprayed onto the cylinder walls and piston bottoms. A vertical channel for supplying oil to the camshaft housings and an upper longitudinal oil channel branch off from the main oil line, connected by drillings in the block head to hydraulic compensators of clearances in the valve mechanism. A pressure-reducing valve is screwed into the end part of the upper longitudinal channel, limiting the oil pressure in the cylinder head.
To lubricate the camshaft bearings, oil from the vertical channel enters the central axial channels of the camshafts through a radial hole in the journal of the third bearing and is distributed through them to the remaining bearings.
The camshaft cams are lubricated with oil that comes from the central axial channels through the radial holes in the cams. Excess oil is drained from the cylinder head into the oil pan through vertical drainage channels.
Changing the engine oil and oil filter is described in section. "Changing engine oil and oil filter"), removal and installation of the oil pump are discussed in the next subsection.