A timing belt is typically constructed of rubber and is used by a vehicle to turn the camshaft during engine operation. The timing belt is also responsible for maintaining valve and piston synchronization. Severe engine damage will likely occur if your timing belt fails. Incorrect timing setting can also cause engine damage that will lead to bent valves, destroyed pistons, or piston rod failure.
Most timing belts will need to be replaced every 50,000 to 90,000 miles and when there are cracks or noticeable wear on the belt. Most manufacturers will also suggest that the timing belt tensioner and all the pulleys are replaced at the same time as the timing belt.