Details of the timing mechanism of a 4-cylinder engine:
1 - camshaft sprocket; 2 - axes of the rocker arms of the intake and exhaust valves; 7 - rocker; 9 — an arm of fastening of the case of the distributor of ignition; 10 - inlet valve; 11 - exhaust valve; 12 - drive chain damper; 13 - chain tensioner shoe; 14 - tensioner plunger.
Features of the gas distribution mechanism of 6-cylinder engines:
1 - four-bearing camshaft; 2 — a gear wheel of a drive of the distributor of ignition.
Details of the timing cover and rear camshaft bearing:
A - engine models «518», «520»; B - engine with fuel injection system «Kugetfischer» BMW «520i».