The Kia Sorento Crankshaft Pulley is the engine's power hub that transfers engine torque to components that are vital to the car and also acts to dampen down vibration. It bolts to the crankshaft harmonic balancer and as the engine turns, this Crankshaft Pulley causes the serpentine belt to turn which drives the alternator, power steering pump, and A/C compressor all to keep your electrical charge as well as steering assist and cabin cooling in place. Because every Kia Sorento engine uses only one belt, accurate tension and alignment around the Crankshaft Pulley is important. If the tensioner or idler attached to the Crankshaft Pulley wears, the belt may slip, squeal, overheat, or even reduce the life of the bearings, which can cause dimming of lights or a check-engine warning. To help counteract the strain during deceleration, later Kia Sorento models combine the Crankshaft Pulley driven belt with alternator decoupler units that allow the alternator to freewheel, reducing the strain and increasing the life of the belt and tensioner system. Earlier models of the Kia Sorento simply applied fixed alternator pulleys, so the main difference across years is that added freewheeling feature which smooths out things and limits vibration.
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