One simple question occurs to me. If you replace a belt by age, how do you know when your new belt was manufactured? Could it be 3 or 4 years old already?
Jumping into this thread a little late, sorry. I had an experience in 1990, on a Japanese car, where after having had to get a valve job due to a timing belt breaking, the timing belt broke again not long after. The culprit? A frozen water pump. Google it: if the water pump freezes, like mine apparently did, the timing belt can easily break. Thus another valve job. (I got rid of the car rather than pay for another valve job. Painful experience). Ergo, another good reason to replace the water pump when the opportunity presents itself, it CAN BE catastrophic when it fails.Ya I am. There’s no need. And water pump failure isn’t catastrophic