In some engines, the operating mechanisms consist of a single-drive mechanism. The 6-cylinder, General Motors (GM) 71 engine is an

Figure 5-1. Camshaft and accessory drive (General Motors 6-71).

example of such an engine. A complete assembly that transmits power from the driving part to the driven part, the operating mechanism of the GM 71 consists of gears, shafts, and couplings.