Fig. 2.24. Crankshaft sprocket: 1 – oil pump drive sprocket; 2 – timing mechanism drive sprocket; 3 – front part of the engine; 4 – outer diameter; 5 – tooth width
The crankshaft sprocket is made of high-strength chromium steel. The working surface of the teeth is hardened to increase wear resistance at all points of contact with the chain. The crankshaft sprocket consists of a chain drive sprocket, a timing mechanism, and an oil pump drive sprocket, which are combined into a single element. The keyway used to install the sprocket is missing (Fig. 2.24).