The Duocentic oil pump with trochoidal engagement, driven by the crankshaft via a chain drive, is installed in the engine sump and takes oil from the sump with an oil receiver, after which it pumps it through a full-flow oil filter into the engine's pressure oil line. The oil filter is installed separately from the engine and connected to it by means of hoses, connected in series with the main line.
After the oil filter, a pressure reducing valve is installed, which, when the pressure increases above the set value, dumps excess oil into the oil bath (pan). When the filter is clogged, the bypass valve directs unfiltered oil directly into the pressure line. The opening pressure of the pressure reducing valve is 4.5 kgf/cm².
A check valve is installed in the oil filter fitting, which prevents oil from leaking out of the channels and hydraulic valve lifters after the engine has stopped.
The purified oil is supplied via the pressure line and its branches to the main bearings of the crankshaft. Through inclined holes in the body of the crankshaft, the oil is supplied to the connecting rod journals and is sprayed to the piston pins and cylinder mirrors. At the same time, the engine oil is supplied via vertical channels to the cylinder head to the camshaft bearings, cylindrical hydraulic tappets of the valve drive, valve guides, chain tensioners and the mechanism for changing the position of the intake valve drive shaft.