Details of the valve timing mechanism:
1 — timing mechanism covers; 2 - mounting sleeve; 3 - timing mechanism cover gaskets; 4 — front crankshaft oil seal; 5 — lifting paw ("318i"); 6 — thermoelectric switch (on "318i"); 7 — camshaft; 8 — toothed pulley of the camshaft drive (until November 1978.); 9 — toothed pulley of the camshaft drive (since November 1978.); 10 - Double-row roller chain of the camshaft drive (until November 1978.); 11 - Single roller camshaft drive chain (since November 1978.); 12 — camshaft flange; 13 — chain tensioner; 14 — tensioner shoe; 15 - chain guide shoe; 16 — intake valve rocker shaft; 17 — exhaust valve rocker shaft; 18 — rocker arms; 19 - pressure spring; 20 - adjusting eccentric;21 - plug; 22 — thrust ring; 23 - crackers; 24 — upper spring plate; 25 - oil deflector cap; 26 - spring; 27 - lower spring plate; 28 - exhaust valve; 29 — inlet valve.
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