A square-toothed, reinforced rubber belt that is driven by the crankshaft and operates the camshaft. Toe-In (Out) A term comparing the extreme front and rear of the front tires. Closer together at the front is toe-in; farther apart at the front is toe-out.
A crankshaft-driven "toothed" belt that drives an overhead camshaft or camshafts and, in some cars, a water pump. The camshaft(s), in turn, via their cam lobes, open and close the cylinder head intake and exhaust valves. This belt should be changed at the mileage interval recommended in your owner's manual or service manual, usually between 60,000 and 90,000 miles.
A timing belt, timing chain or cam belt is a part of an internal combustion engine that controls the timing of the engine's valves. Some engines use timing gears. The term "timing belt" is also used for the more general case of any flat belt with integral teeth.