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Serpentines can last up to ten years an an average car. When looking at the belt on the ribbed side, you need to replace it when there are two sections of ribbing missing within two inches from each other. If there is a small(1/2) piece missing from 1 rib, the belt is fine.
On a vehicle with a serpentine belt system there is always a tensioner pulley. Usually in the center of the routing network, you need to place the correct size wrench on it a â¦ nd push or pull with one hand releasing the tension on the belt. With the tension released, use the other hand and slip the belt out. Belt tension of each belt is checked by pushing on the belt at a distance halfway between the pulleys (push firmly with your thumb and see how much the belt deflects) A rule of thumb is that if the distance from pulley centre is between 7 and 11 inches the belt should deflect 1/4 inch, 12 to 16 inches 1/2 inch.