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Timing belts are made from rubber and high tensile fibers. The timing belt synchronizes the camshaft and crankshaft timing. It is important to understand that this belt is different than the serpentine belts. If the belt breaks, it can cause serious engine damage.

For the engine to run correctly, the valves must open at the correct time for fuel and air to enter the combustion chamber, close while the fuel is compressed, remain closed as the piston is pushed down by the combustion, and then open to allow the exhaust gas out of the engine. The timing belt drives the valves to open and close at the correct time. Some vehicles use a metal chain or gears to drive the valves, however, timing belts, made out of lighter-weight rubber, are generally quieter in operation, and more fuel efficient because the engine is driving less weight. Timing belts are generally not visible without removing several components and covers. The belt should be replaced at manufacturer-recommended intervals, usually 60, 90, or 105,000 miles, or when inspection of the belt shows signs of wear. In some vehicles, the timing belt drives the water pump and must be removed to change the water pump. Since timing belt replacement is often a time-consuming job, it is often advisable to replace the water pump at the same time as the timing belt. Other parts replaced at the same time may include the tensioner assembly that keeps the timing belt tight, and any other pulleys that the timing belt rolls around. When a timing belt breaks, the vehicle will be undriveable, and in many situations, the broken timing belt will also result in internal engine damage such as bent valves.