Fig.2.25.The chain drive timing: 1 - an asterisk of a camshaft;2 - tensioner arm;3 - chain tensioner;4 - chain guide;5 - the crankshaft sprocket;6 - chain valve timing;7 - step size;8 - step;9 - Feedback
Engine oil inside the front cover of the engine lubricates the timing chain drive and sprocket. Pins chain valve timing nitrided to increase the abrasion resistance (Fig. 2.25).