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Unread 10-22-2012, 07:49 PM   #1
Nolanitesystems
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2006 LJ Wrangler 
 
Join Date: Feb 2010
Location: NY
Posts: 7
Squealing (serpentine belt?) troubleshooting

Long story, but I would appreciate some advice.

Jeep: 2006 LJ, ~55k miles

For a couple days I have heard a high pitch squealing noise that lasted ~30 seconds after I start my Jeep. It doesn't happen every time, but it is the worst in the morning, after the jeep has sat overnight in cold upstate NY. I assumed the squealing was the serpentine belt and the cold temperatures were making it worse, especially first thing in the morning.

I inspected the belt, which appeared to be in great shape, but replaced it anyway, Belt from NAPA ->NBH 25060882 . I also noticed some wear on the idler pulley and tensioner pulley so I replaced them too, just to be thorough.

I started the car (which was squealing pretty good right before the replacements) and the noise was reduced to a whisper (this was around 4pm, ~65F outside).

Since there was still a little squeal, I double checked everything and even though there is an auto tensioner, the belt felt really loose... I could deflect it 3/4"-1" by pushing on it. I quadruple checked the belt to make sure it was the right one (which it was) and measured the length myself.

Next, I looked at the tensioner assembly... and even though I just put on a new belt, the assembly was near the end of its available travel. To take an image from getahelmet.com's write up, the yellow indicator was ~1/2 way to the red indicator, as seen below.



Figuring the tensioner could be worn out, I replaced that too, but the belt ended up being only slightly tighter than it was before, if at all. I then called it a day and left the car overnight.

I go to start it this morning (~40F) and the squealing is back in full force. Naturally, I was pissed so I went back to the store and bought a slightly smaller belt Dayco 5060880 (88.0" long vs. 88.25" long).

The shorter belt bet is tighter than the OEM replacement one and the tensioner arm has more available travel. The Jeep has stopped squealing for today, but I'll wait till tomorrow morning to see if it really stopped.


If you have hung in this long, here are my questions:

Does anyone know what could cause the belt to become so loose, even after I replaced all the worn pulleys?

Will there be any problems if I keep running with the slightly shorter belt? (it is the same width and # of ribs, just slightly shorter... I can also throw the OEM replacement one back on for the summer when it seems to be a non-issue).

Any other thoughts/ideas?


Thanks

-Terry

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Unread 10-22-2012, 08:05 PM   #2
Davf24
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2002 TJ Wrangler 
 
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reply

It almost sounds like you have a water pump going, when it is cold the pump may be stiffer and when it warms up it loosens up, maybe the bearings are going bad??

Just an thought.
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Unread 10-22-2012, 09:04 PM   #3
jeffreyd1964
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2000 TJ Wrangler 
 
Join Date: Oct 2012
Location: wayne, nj
Posts: 58
squealing

When you figure out what that 15 second squeal is when you first start the jeep on a cold morning please let me know the fix! I have been putting up
with that squeal for 10 years
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Unread 10-23-2012, 05:30 AM   #4
dieselcrackel
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Location: Oradell, NJ
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Not saying this is your problem but I went through everything you are going throuh. Mine wound up being the opda especially if it was on a cold morning.
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Unread 10-23-2012, 05:47 AM   #5
Bufordray
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Location: Dryden,Michigan, Michigan
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Napa stetescope

Next time ya go back to napa,buy one of those (stetescope)+my spelling sucks....It helped me to find exactly where the noise was coming from
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Unread 10-23-2012, 08:30 AM   #6
vic_sinclair
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Does your squeal sound like this:

http://www.jeepforum.com/forum/f9/20.../#post10663478
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Unread 10-23-2012, 10:40 AM   #7
jeffreyd1964
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You replaced the belt and the pullys and it still makes that squeal.
Do you think it can be the alternator?
It will be getting cold soon and that squealing pig that lives under my hood
every winter for the last 10 years will be back , if I don't find a fix
this fall I will use earplugs when I start my TJ every cold morning this winter.
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Unread 10-23-2012, 10:50 AM   #8
Nolanitesystems
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Location: NY
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Well, bad news.... I started my car this morning (43F) and the squealing was still there. I did find that if I rev the engine for a second or two it stops right away.

I'll look into the opda issue.
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Unread 10-23-2012, 10:56 AM   #9
vic_sinclair
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To look into the OPDA issue, just listen to those Youtube videos I posted. You will know immediately if that's your squeal. When my OPDA started to die, it was also only on startup and revving the engine stopped it.
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Unread 10-23-2012, 11:26 AM   #10
Scarfist
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Quote:
Originally Posted by Bufordray View Post
Next time ya go back to napa,buy one of those (stetescope)+my spelling sucks....It helped me to find exactly where the noise was coming from
No need for a stethoscope. Get a long screwdriver. put the end of it on the part (non moving part) you think is squeeling and put you ear to the other end. The sound vibration will transmit through the screwdriver and to your ear. You will know when you find the noisy part, you will hear it.
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Unread 10-23-2012, 11:32 AM   #11
jeffreyd1964
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Join Date: Oct 2012
Location: wayne, nj
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what if you take off the serpentine belt the night before or in the morning
and then start the jeep to see if it still squeals. Seems like this test will
eliminate some possible reasons of our issues. I would take mine off for this test but its not that cold in NJ yet.
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Unread 10-23-2012, 11:49 AM   #12
chachi44089
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Location: Vermilion, Ohio
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Mine did the same thing when I bought it. I replaced everything, all idles, tensioner, water pump and belt. Still squeals sometimes, but is much less frequent. I think mine is the alternator..
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Unread 10-23-2012, 02:14 PM   #13
JeffBowser
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Do the 2006's have a harmonic balancer pulley? I had a similar squeal some time back that turned out to be the balancer going bad....
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Unread 10-23-2012, 02:53 PM   #14
jeffreyd1964
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Could also be the power steering pump or the AC compressor.
I hope someone figures this out soon so we don't keep spending money
on parts we don't need.
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Unread 10-23-2012, 04:18 PM   #15
flying_bosun
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If it's the same as the sound in the videos linked, it is 100% OPDA and I would recommend parking it immediately until you get the issue resolved or you risk loosing the cam. It can happen in less than a few hundred miles (don't ask me how I know), so don't mess around.
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