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It is not necessary to adjust belt tension on the 4.7L engine. These engines are equipped with an OPERATION The automatic belt tensioner maintains belt ten- sion by using internal spring pressure, a pivoting REMOVAL On 4.7L engines, the tensioner is equipped with an indexing tang on back of tensioner and If the above specification cannot be met, check for: width) • Worn bearings on an engine accessory (A/C com- pressor, power steering pump, water pump, idler pul- • A pulley on an engine accessory being loose • Misalignment of an engine accessory • Belt incorrectly routed. NOTE: A used belt should be replaced if tensioner (1) Remove accessory drive belt (Refer to 7 - COOLING/ACCESSORY DRIVE/DRIVE BELTS - REMOVAL). (2) Remove tensioner assembly from mounting bracket (Fig. 5). WARNING: BECAUSE OF HIGH SPRING PRES- (3) Remove pulley bolt. Remove pulley from ten- sioner. INSTALLATION (1) Install pulley and pulley bolt to tensioner. Tighten bolt to 61 N·m (45 ft. lbs.) torque. (2) An indexing slot is located on back of tensioner. Align this slot to the head of the bolt on the front (3) Install accessory drive belt (Refer to 7 - COOL- ING/ACCESSORY DRIVE/DRIVE BELTS - INSTAL- (4) Check belt indexing marks (Fig. 4). Fig. 4 Automatic Belt Tensioner 1 - AUTOMATIC TENSIONER ASSEMBLY Fig. 5 Automatic Belt Tensioner—4.7L Engine 1 - TIMING CHAIN COVER 7 - 20 ACCESSORY DRIVE AN BELT TENSIONERS - 4.7L (Continued) |