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2336087

BELT TENSIONER

A belt tensioner is a spring-loaded pulley assembly that maintains proper tension on the engine's serpentine or accessory drive belt. It ensures that the belt stays tight against the alternator, water pump, power steering pump, and other accessories, preventing slippage, noise, and premature wear. A failing tensioner can lead to belt squeal, battery charging problems, overheating, or loss of power steering. Replacement is typically needed when the tensioner pulley bearing becomes noisy, the spring weakens, or the belt shows signs of misalignment.