A timing belt is one of the most important parts of a car that makes the camshafts and the crankshafts work in collaboration, ultimately keeping the engine running. The crankshaft moves the pistons which in turn helps the power and intake cycles, whereas the camshaft takes care of the valves that allow fuel entry. A timing belt allows both to work in sync with each other. As it precisely times the opening and closing of the valves with the help of the pistons, the name is apt – timing belt. It also runs the oil pump, water pump, and injection pump. However, not all cars have a timing belt, some might see a comeback of the timing chain which was used till the early 80s.