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A belt tensioner pulley is the roller for the tensioner assembly which carries the drive belt. It provides the necessary tension to a drive belt which transmits rotational power from the crankshaft pulley to the other devices. It also guides the drive belt to prevent rubbing and abrasion with the engine components. A faulty belt tensioner pulley will cause to loosening of the drive belt which may lead to slippage while the engine is running, resulting to unusual noises and other operation damage due to obstructed power transmission. Auto Parts Network offers tough and reliable parts to keep your vehicle running smoothly and efficiently.