Idler or tensioner pully whining? - Jeep Wrangler Forum
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Old 04-22-2014, 01:09 AM   #1
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Idler or tensioner pully whining?

So I'm getting a whining noise that gets louder as I build up the rpm's. I've read other people have had the same problem after going through water or mud. I'd rather fix it myself than be without transportation for a few days while my jeep sits at a dealership but I have no clue how to replace the tensioner pulley. I haven't been able to find much "how to" info on the 3.6 so I'm hoping someone can help me out or give me some insight. Any help is very appreciated, I'm still pretty new to the jeep world. It seems like every time I play in the mud I regret it but I keep going back...

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Old 04-22-2014, 03:28 AM   #2
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If it is a pulley or other bearing it is to track down. Get a mechanics stethoscope for $10 or less from Harbor Freight or Autozone and place the the rod sensor on each pulley on the belt. You hear a distinct grinding noise instead of smooth sanding like noise.

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Old 04-22-2014, 02:31 PM   #3
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I got a stethoscope and I could notice a grinding in the two pulleys sort of behind the alternator in these photos. Is this what I need to repair?
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Old 04-22-2014, 02:59 PM   #4
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Yes, there are 2 black plastic Idle pulleys. You need to replace both of them. Unbolt both pulleys, one bolt each and replace... Then use a torque wrench on the tensioner to get the belt back on. It's a 20 min job.
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Old 04-22-2014, 03:01 PM   #5
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I had to replace both of mine at 9k miles. It was from playing in the mud. I kept driving with it whining and then burnt up and the belt came off while driving. So I had to replace my on the side of the road.
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Old 04-22-2014, 06:08 PM   #6
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Where'd you get the new pulleys? The noise isn't too bad now but I'm trying to fix it early so I'm not fixing it on the side if the road like you said
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Old 04-22-2014, 09:19 PM   #7
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So I've been searching and it looks like nobody has any idler pulleys for the 3.6.
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Old 04-22-2014, 10:19 PM   #8
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seems like a simple warranty repair should not have to leave it for more than an hour or so.
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Old 04-23-2014, 08:44 AM   #9
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Check the vendor here, moparonlineparts. They should have them. Note, order 2 of the single pulleys. The tensioner is replaced as a complete unit. The pulley is the same as the one mounted on the top right.

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Old 04-23-2014, 08:57 AM   #10
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Another simple way to test for a bad pulley or accessory is to remove the drive belt and spin everything by hand. This way you isolate everything individually
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Old 04-23-2014, 02:45 PM   #11
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I found them on moparonlineparts.com. I'm just not sure which of the three I need. They have upper idler pulley, lower idler pulley, and serpentine idler pulley
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Old 04-28-2014, 07:06 PM   #12
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I had to get it from the parts dept at the dealership. It is covered but my dealership service dept sucks. So I did it myself on the side of the road.
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Old 04-28-2014, 07:40 PM   #13
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Quote:
Originally Posted by Thatguy93 View Post
I found them on moparonlineparts.com. I'm just not sure which of the three I need. They have upper idler pulley, lower idler pulley, and serpentine idler pulley
It the same pulley. You are buying a kit with the belt idler. Same thing on the 3.8L. You order the pulley, 28 dollars. You buy the belt idler, 72 dollars. At least it includes the 28 dollar pulley.

Mopar won't list a separate pulley for the unit. Even though the actual pulley is the is same.

Bob K.

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