A belt or chain tensioner is part of the distribution system of your car. Their purpose is to ensure the timing belt is set to the right tension. The belt tensioner is assisted by the pulley wheels which make sure the timing belt can turn.
At Mister-Auto.co.uk we strongly recommend you replace your belt tensioner and the pulley wheels when you are changing your timing belt. If you order a complete timing belt kit, you will find both timing belt and the pulleys inside and ready to be fixed to your car.
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