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Tensioners and Pulleys are essential components of the engine’s accessory drive system that ensure the synchronized operation of auxiliary components: the Tensioner uses a spring or hydraulic mechanism to maintain constant, optimal pressure on the belt to prevent slipping and noise, while the Pulley (often an idler pulley) serves to guide the belt’s path and increase its wrap angle around components like the alternator or water pump, together ensuring smooth, vibration-free power transfer.
