The tensioner pulley on the 1993 Chevrolet Blazer maintains tension on the drive belt. The pulley rotates with the belt as the crankshaft pulley turns the belt. The tensioner pulley has a bearing pressed into the center of it, and the pulley rotates on the bolt that holds it onto the tensioner arm. Over time, the bearing wears out. When this happens, the tensioner pulley can freeze up and cause the belt to slip.
Tools Used: Tools, 3/8-inch ratchet driver, Socket set
Place a three-eighths-inch ratchet driver into the square hole on the tensioner arm that the pulley bolts to. The tensioner pulley is located to the left of the engine’s crankshaft pulley. Lift up on the ratchet handle to release tension on the Blazer’s drive belt. Pull the drive belt off the tensioner pulley. Change the ratchet mechanism to counterclockwise so you can hold the ratchet handle down to prevent the arm from pulling upward.
Remove the bolt in the center of the tensioner pulley using a socket and ratchet. Remove the pulley from the tensioner arm. Place the new pulley against the tensioner arm, and thread the bolt through the tensioner pulley into the tensioner arm using your fingers. Tighten the bolt using the socket and ratchet. Change the ratchet mechanism to clockwise so you can pull the ratchet handle up. Pull the handle upward, and slip the belt over the tensioner pulley. Lower the handle of the ratchet to apply tension on the belt, and then remove the ratchet from the idler arm.