The engines are equipped with a circulating pressure lubrication system.
The oil pump draws oil through a screen from the oil pan and pressurizes it into the system through the oil filter. There is a pressure reducing valve at the outlet of the oil pump. When the pressure rises above the set value, the valve opens and part of the oil drains back into the oil pan.
Through the central hole of the oil filter, oil enters directly into the main channel. When the oil filter is clogged, the bypass valve sends oil into the system unfiltered.
Channels for lubricating the crankshaft bearings branch off from the main oil line. Through inclined holes in the crankshaft, oil is supplied to the connecting rod bearings. To cool the pistons, oil is injected onto them from below through nozzles.
At the same time, oil reaches the cylinder heads through vertical galleries and enters to lubricate the camshaft bearings and elements of the valve mechanisms of the gas distribution system.
Depending on the engine power, the oil can be cooled in an additional oil cooler located on the side of the oil filter housing and included in the engine cooling circuit.
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