Is it necessary to replace the tensioner pulley when changing the generator belt?

[LeLukas]

Replace the tensioner pulley when changing the belt. It is recommended to replace the tensioner pulley together with the belt, as follows: 1. Belts: There are two belts in a car, the timing belt and the accessory belt. The replacement cycle of the timing belt is almost the same for all cars, which is about three years or 60,000 kilometers. 2. Replacement: When replacing, the tensioner pulley and the idler pulley need to be replaced at the same time. Because the lifespan of the belt and the tensioner pulley is almost the same, when the belt's lifespan is up, even if the tensioner pulley is still usable, it is unknown how much lifespan is left. 3. Safety: It is also not possible to replace it after another 20,000 kilometers, because the labor cost for replacing the belt is very high, equivalent to spending the labor cost twice. For the sake of safety and cost savings, they should be replaced at the same time. However, the water pump does not need to be removed and replaced.