A tensioner pulley is built in to produce the required tension on the belt. This tension is done in two ways: a spring system or a hinge system
The belt tensioner and pulleys work together.
The idler is a piece similar to a foley, which is connected to the engine body by means of a bearing. This piece is used to adjust the tension of the belt.
Reasons of Harzgerd failure:
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Bearing failure
As you know, the debris is placed on the bearing, as a result of the failure of the bearing, it disrupts the operation of this part. In such cases, the debris makes noise.
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Belt stiffness