httpv://www.youtube.com/watch?v=1KJ6wfmB0hI

The interval for replacing a timing belt in around 100,000 miles. If only the belt is replaced, all of the other components will need to perform another 100,000 miles. We recommend replacing pulley, tensioner and water pump (if driven by the belt) so the job doesn't have to be unnecessarily repeated before the next interval.