Details of the crank mechanism:
A - engines of cars of all models except «320» And «320i»;
B - engine models of cars «320» And «320i»
1 - crankshaft; 2 - liners of main bearings of the crankshaft; 3 - inserts of the middle main bearing; 4 - segment keys; 5 - connecting rod; 6 - connecting rod bearing shells; 7 - bushings of the upper head of the connecting rod; 8 - piston; 9 - piston pin; 10 - oil scraper ring; 11 - lower compression ring; 12 - top compression ring; 13 - crankshaft pulley; 14 — a gear pulley of a cranked shaft (until November 1978); 15 — a gear pulley of a cranked shaft (since November 1978); 16 - flywheel; 17 - leading flange on vehicles with automatic transmission; 18 - cylindrical pin; 19 - pins on cars with automatic transmission; 20 - centering bearing of the gearbox input shaft; 21 - felt ring; 22 - needle bearing; 23 - bushing.