Timing Belt Replacement
The timing belt is what synchronizes the cam and crankshafts in your engine and keeps the entire car running smoothly. For everything to work properly, the timing belt, has to perfectly sync the valves with the motion of the pistons.
A broken timing belt can cause the pistons to collide with the valves, potentially bending or breaking them, as well as the piston, cylinder and possibly the crank-shaft. For more information click and watch: