Lubrication system details:
1 - toothed pulley of the oil pump; 2 - oil pump drive chain; 3 — hub; 4 — oil pump housing; 5 — oil pump drive chain tension adjusting plate; 6 - inner rotor; 7 - outer rotor; 8 — spacer; 9 — cover with oil receiver; 10 — discharge pipeline; 11 — pressure reducing valve branch pipe; 12 — pressure reducing valve; 13 - guide tube; 14 — oil filter bracket; 15 - oil filter; 16 — oil dipstick with tube (except "315" and "316" from 1981 model year); 17 — oil dipstick with tube (for "315" and "316" since 1981 model year).
The text is based on materials from the website: www.bmwman.ru