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Old 11-06-2019, 05:28 PM
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Whine at idle from pulley(s) - help with diagnosis? *Video*

Thank you for any and all help and guidance. I appreciate it. I have my suspicions but I thought I'd post a quick video of the sound at idle. This is the first I've heard it today. Sound is loudest at idle but quickly gets silent as RPMs increase. What do you all think it is and/or what should I replace?


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Old 11-06-2019, 08:51 PM
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Alright, since nobody responded, my suspicions are the idler pulley, belt and possibly the main adjustable idler pulley. So I ordered all three and will replace them.

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Old 11-06-2019, 11:09 PM   #3
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If you take the belt off & spin each component you should be able to tell which is bad.

The other way would be to use a stethoscope or a long screwdriver to your ear (what I use) to check each component as it idles (belt on, of course).
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Old 11-07-2019, 12:04 AM   #4
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Quote:
Originally Posted by RUBI 4 MY MRS View Post
If you take the belt off & spin each component you should be able to tell which is bad.

The other way would be to use a stethoscope or a long screwdriver to your ear (what I use) to check each component as it idles (belt on, of course).
Yep this works very well!
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Old 11-07-2019, 07:07 AM
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Good ideas Shark and Rubi, thanks!
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Old 11-08-2019, 04:41 PM   #6
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If it still makes this noise after replacing those parts, it may be the harmonic balancer about to crater.
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Old 11-08-2019, 07:43 PM   #7
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One can use a short piece of water hose like a stethoscope too.
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Old 11-10-2019, 07:21 AM
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Drove it yesterday and no noise. Replaced both idler pulleys (adjustable and non adjustable). Will update.
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Old 11-16-2019, 09:51 PM   #9
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A while back, my Jeep would howl sporadically. We could not figure out what the noise was or where it was coming from. Finally, the idler pulley bracket broke so my husband replaced the idler pulley, tensioner pulley and belt. No more howling!! The above video sounds almost like my howling.

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