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What are idler pulleys?


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Wiki User
2008-08-28 17:46:24
2008-08-28 17:46:24

== == it is a free pulley that works as a tensioner on any belt bolted to hold or spring loaded

An idler pulley usually tensions a belt.. eg supercharger belt is kept taut by its respective idler pulley

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Idler pulleys are used to maximize belt contact with other pulleys and to redirect belt around other parts that might interfere with the belt.

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They very in price, depending on the car, from around $12 to $80.

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there is one, but two if you count your belt tensoiner.

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only if the idler arm will not hold the tension on the belt and the pulley needs replaced when the are warn sharp or warn flat

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The engine usually has an idler and/or tensioning pulley as well as a few pulleys that use the power of a traveling serpentine belt to drive components such as the alternator, a/c pump, etc. Any of the pulleys that have one or more grooves that assist to guide the belt(s) are, technically, sheaves. Idler or tensioner pulleys that are completely flat because the flat back of the belt rides on them are not sheaves, but are pulleys.


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