Timing Belt Replacement
The timing belt on your vehicle must be replaced at an interval usually specified by the manufacturer. Depending on the vehicle's make and model, this interval can vary from 40,000 miles to more than 120,000 miles or 5 years, whichever is the sooner. However, the timing belt must be replaced prior to the manufacturer's recommended interval if it shows any damage like cuts, cracks or excessive wear. Remember, if not replaced in time, the timing belt may break possibly causing serious engine damage.
Even if your timing belt looks OK, pulleys, tensioners and water pump must also be inspected / changed