Details of the valve timing mechanism of a 4-cylinder engine:
1 - camshaft sprocket; 2 - rocker arm axes for intake and exhaust valves; 7 — rocker arm; 9 — bracket for mounting the ignition distributor housing; 10 — inlet valve; 11 - exhaust valve; 12 — drive chain damper; 13 — chain tensioner shoe; 14 — tensioner plunger.
Features of the valve timing mechanism of 6-cylinder engines:
1 - four-bearing camshaft; 2 — ignition distributor drive gear.
Timing mechanism drive cover parts and rear camshaft support:
A - engine models "518", "520"; B - engine with fuel injection system "Kugetfischer" BMW "520i".