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These belts typically are tensioned by an idler pulley with an automatic tensioner. Just because there's an automatic tensioner doesn't mean it's working right. Any of the root causes discussed below can result in a belt getting chewed up fast, or popping off the pulleys.
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www.popularmechanics.com/how_to_central/automotive/1272...
www.popularmechanics.com/how_to_central/automotive/1272201.html
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Idler-wheel - Wikipedia, the free encyclopedia
An idler-wheel drive is a system used to transmit the rotation of the main shaft of a motor to another rotating device. For example the platter of a record-reproducing turntable or the crankshaft-to...
en.wikipedia.org/wiki/Idler-wheel
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1. 15 mm socket; 2. Ratchet; 3. Torque Wrench (ft-lbs); 4. Idler Pulley (p/n 12564401); 5. Drive belt ( optional p/n 12569527) ... 3. You will need to remove the drive belt (accessory) in order to remove the drive belt idler pulley (accessory). To do this you must use a ratchet and 15 mm socket.
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www.installuniversity.com/install_university/installu_p...
www.installuniversity.com/install_university/installu_pages/sophomore_year/idler_pulley_install.htm
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You need to check the idler pulleys carefully; most serpentine drive belt problems are due to bad idler pulleys. Since most, if not all, idler pulleys are smooth, a loose idler pulley will cause the serpentine drive belt to slip off much easier than a grooved idler pulley.
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autorepair.about.com/library/weekly/aa071205d.htm
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Idler pulleys are used to take up slack, change the direction of transmission, or provide clutching action. ... There are many types of idler pulleys. Examples include an industrial idler pulley and a metric idler pulley. An industrial idler pulley is a pulley on a shaft that rests on or presses against a drive belt to guide...
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mechanical-components.globalspec.com/LearnMore/Mechanic...
mechanical-components.globalspec.com/LearnMore/Mechanical_Components/Power_Transmission/Idler_Pulleys
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I wanted to replace the >idler pulley but couldn't get it off. I don't have the special puller >and my regular puller wouldn't fit in the confined space. No, I didn't >pull the IC. Any McGiveresque solutions out there?
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www.audifans.com/archives/1998/04/msg00089.html
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Next in Serpentine Belts - Tensioners - Pulleys >> ... View Larger Image ... Item Number: 98072072...
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www.merchant-automotive.com/idlerpulley.aspx
www.merchant-automotive.com/idlerpulley.aspx
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I grabbed an idler pulley off the serpentine-belt-equipped V6 in a mid-90s Chrysler Concorde and brought it back to Hellhammer. About 10 minutes later, this Space Shuttle-grade rig was in full effect.
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jalopnik.com/5108147/power-steering-belt-wont-stay-on-j...
jalopnik.com/5108147/power-steering-belt-wont-stay-on-junkyard-serpentine-idler-pulley-to-the-rescue
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IDLER PULLEY LESSON; It is a variation of a drafting assignment form an old Mechanical drawing book. The objectives of this lesson are visualization, interpretation of drawings, planning and sequencing. ... Create a separate folder in my documents, complete lessons and call it idler pulley. Keep all files in that folder...
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blogs.solidworks.com/teacher/files/idler_pulley_lesson....
blogs.solidworks.com/teacher/files/idler_pulley_lesson.pdf
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