The national cost for drive belt idler pulley replacement is between $54 and $233 with an average of $100

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In Ashburn, people who book through CarAdvise save $26 on average for Drive Belt Idler Pulley Replacement. Lock in this price now.

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National average cost of a Drive Belt Idler Pulley Replacement
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What is a drive belt idler pulley and how does it work?

The rubber drive belt on your car or truck allows the engine to provide power for several vehicle systems. Attached to your engine are an alternator, power steering pump, A/C compressor, and (on some engines) a water pump. Each one of these engine components has a pulley on the front. The drive belt, often called a “serpentine belt”, snakes its way around all of these pulleys to make them spin when the engine is running. The idler pulley helps to route the belt properly so as to ensure contact with all of the other pulleys.

Signs that a drive belt idler pulley needs to be replaced

When a drive belt idler pulley is going bad or fails, the following signs might serve notice of its condition

Squealing noise coming from the front of your engine that raises in pitch with engine RPMs

The belt comes off of its pulleys

Your battery warning light comes on

The drive belt flutters or tracks in an off-centered manner


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How is this service performed

How is a Drive Belt Idler Pulley Replacement done?

To access the drive belt idler pulley, a technician must first remove any shields, guards, or accessories that are in the way. Once the pulley is in view, the drive belt must be removed. The following list is typical of the procedure to replace a damaged or worn idler pulley

  • Release any tension from the drive belt tensioner by either loosening the tension bolt or turning against the tension with a special service tool
  • Taking care to note the routing of the serpentine belt in advance, remove the belt from the engine
  • Unbolt the old idler pulley and remove it from its mounting location
  • Install the new idler pulley and torque the mounting bolt(s) to the manufacturer’s specifications
  • Inspect all other related components for signs of wear
  • Reinstall drive belt and load tensioner
  • Reinstall any components that were removed for access


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