Pic. 2.23. Camshaft sprocket: 1 - camshaft sprocket; 2 - actuator for changing the valve timing
The design uses a high rigidity alloy alloy camshaft sprocket hardened to improve abrasion resistance at the point of contact with the timing chain. On L3 engines, the intake camshaft sprocket is integrated with the variable valve timing actuator (pic. 2.23).