Since the timing belt is a part of the car that is responsible for the proper operation of the motor, there are a few signs that you should pay attention to if you think that it's failing. One of the first things that you'll notice is a ticking or whining sound coming from the motor. While this could be one of the other belts, it's often the timing belt.
If the engine won't turn over, then it could be the timing belt. The starter will usually begin to engage, but the belt that allows for the opening and closing of the camshaft won't allow for the motor to completely turn over.
When you notice issues with the timing belt, you can bring the vehicle to our service center here at Gurley Leep Lincoln in South Bend so that someone from the service center can perform an examination. It's important to address timing issues as they are seen before the belt stops working and disrupts the operation of the motor.