2012 has a RPM related whine. Alternator or Idler pulley? - Jeep Wrangler Forum
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Old 04-29-2013, 10:52 AM   #1
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2012 has a RPM related whine. Alternator or Idler pulley?

The Problem:
Okay, so I have an whine after my last offroad trip where I took on some mud/water so I'm sure there is mud/water in a bearing somewhere. So far, this is the ONLY symptom and battery charge is fine and even drove about 300 miles.

Steps Taken So Far
I attempted to clean out any mud/debris from the alternator/pulleys with no luck. First I tried compressed air, then water.

I picked up a used alternator with 1k miles on it that I will probably keep as a spare if I don't need to swap out.

Got a quote from the dealership of $115 just to diagnose IF the issue isn't covered under warranty.

My Question(s)
1. Other than swapping out the pully, is there a way to diagnose if the problem is just an idler pulley or if it is in fact the alternator?

2. If i remove the tension from the belt, will I be able to spin the three pulleys freely to determine if one (or all) is problematic? Looks like all three pulleys can be had for $60ish so it might not be a bad idea for me to pick them up as spares.

3. How difficult is it to swap out the alternator on a 2012 for a guy who has never done anything but suspensions and snorkel installs?


Thanks all for the help.

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Old 04-29-2013, 11:46 AM   #2
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Old 04-29-2013, 11:49 AM   #3
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When a friend replaced his pulley the bearing was pretty much sized. Like you said, its just under $20. I'd take them off and just see what shape the bearings are in. It's an easy start and could save you a bunch of money. I'd bet that its just the pullies. They are easy to trash off road
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Old 04-29-2013, 12:26 PM   #4
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It looks like there are three pulleys.. one for $12, one for $13 and one for $33. Not sure which ones are the problem..

If I remove the belt, can I spin each one to see where the problem might be?

I really don't want to go to the stealership and risk them charging me $115 to deny me a warranty claim.

BTW.. that jeep that Matador posted isn't mine...
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Old 04-29-2013, 05:06 PM   #5
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well, I ordered the top two ones.. I guess it's always good to have spares... any advice on how to check the existing ones in the meantime? Is it tough to get the belt off?
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Old 04-30-2013, 06:58 AM   #6
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Bump- anyone have any insight?
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Old 05-02-2013, 09:27 AM   #7
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Well, it was just the idler pulleys. I followed steps 1-3 from this thread.

http://www.wranglerforum.com/f33/how...6l-199709.html

PARTS NEEDED:
4627039AA Idler pulleys (2)
6510429AA Replacement Bolt for right side pulley

Just a heads up for anyone ordering for their 3.6L, I had ordered parts 7 & 8 but it turns out that Chrysler now only uses part 7 with an additional bolt.


I also pulled the radiator overflow just to give me a little more room to negotiate the breaker bar. Reseated the belt and made sure it was all together and then put it all back together. Retorqued everything and my jeep no longer is whining. Took a noob like me about 30 minutes.

I decided not to replace the alternator so now I have a spare.
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Old 05-02-2013, 10:19 AM   #8
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Well done!
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Old 05-02-2013, 10:29 AM   #9
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i think so, I'd bet that its just the pullies. They are easy to trash off road. thanks

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