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A tensioner pulley is a crucial component in an engine's accessory drive system. Its primary role is to apply and maintain precise, constant tension on the serpentine or timing belt. This ensures optimal power transmission from the engine to components like the alternator and water pump. By preventing belt slippage, wear, and noise, it guarantees efficient operation. Most tensioner pulleys incorporate an automatic spring or hydraulic mechanism and often use a durable bearing, like a tapered roller bearing, for smooth rotation and long service life.
