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Belt tensioners and tension pulleys keep system and engine belts taut so that the mechanized system which hosts them, and the peripheral systems powered off of them, run smoothly. In vehicle engines, for example, peripheral systems powered from a belt can include the engine fan, air conditioning, electrical system (alternator), power steering, and water pump. A squeaking or chirping noise from a vehicle engine is often due to worn pulley bearings or a worn spring within the tension pulley. Browse our large selection of tensioners and pulleys and note that additional items of interest might include automotive belts and rubber hoses, and automotive belts.