The belt tensioner is designed to apply the necessary tension on the belt. This tension is achieved through either a spring system or a lever system.
The belt tensioner and pulleys work together.
The idler pulley is a component similar to a pulley, which is mounted on the engine body using a bearing. It is used to adjust the belt tension.
Reasons for Idler Pulley Failure:
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Bearing Failure
As you know, the idler pulley is mounted on the bearing. Therefore, bearing failure can disrupt the function of this component, causing the idler pulley to make noise.
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Belt Tension