See Figures 1, 2, 3, 4, 5 and 6
The engines covered in this information are of an "interference'' design. This means that should a timing belt break, there is the possibility of valve and piston damage. As a rule of thumb, it is recommended that the timing belt be replaced at least every 60,000 miles (96,618 km), in order to avoid potentially extensive and costly engine damage.
Timing Belt removal and installation procedures are covered in Engine & Engine Overhaul of this information.