1 - oil pressure indicator sensor, installed at the end of the line
2 - bypass valve, opens when the filter is clogged
3 - safety oil valve, opens when pressure is exceeded
The oil pump sucks oil through the intake filter in the oil sump and feeds it into the main oil filter, there is a safety valve on the discharge side of the pump. If the pressure is exceeded, the oil drains through the valve back into the sump. After the main filter, the oil enters the main oil line. If clogged, the bypass valve directs it into the line uncleaned
From the main oil line there are branches for lubrication of the crankshaft bearings. Through inclined channels in the crankshaft, oil enters the connecting rod bearings and from there to the piston pin in the cylinder. At the same time, oil enters the camshaft bearings and hydraulic tappets through pipelines.
(The original version of the article is posted on the website: AUDIMANUAL.RU)