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Old 01-29-2014, 11:18 PM   #1
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2005 4.0 liter squeal

Just started to do this recently. Weather has been nasty cold and the jeep sits outside for days without moving. Squeals on cold starts then goes away. She is running great otherwise. Should I try cranking down manifold bolts? Gasket leak? Have a video but it won't upload to site

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Old 01-30-2014, 12:02 AM   #2
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First guess would be serp belt...second guess would be idler pulley

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Old 01-30-2014, 10:06 AM   #3
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If it happens at start up it is slipping on the alternator pulley. Next time you start it rev it couple of times while it is squealing then shut it down. See if the alternator pulley is HOT. Be careful. It could be very hot. If it is hot then you verified slippage. You need a new belt, if it is at least 4 years old or is glazed (shiny) or has been contaminated by an engine oil leak. If it is a relatively new belt, you need a new tensioner.
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Old 01-30-2014, 11:25 AM   #4
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Banshee squeal!!

Been as cold as its ever been here in OH. Last 3 cold starts I get a deafening whine from around the serp belt and alternator. Goes away after its at operating temp. Seems to be getting progressively worse. Belt is new, idler looks fine no tilt and belt is good fit. Wondering if it could be alternator bearings? Has a good charge and no chug starts. Runs great beyond the murderous squeal. Recorded a cellular movie of it but cant upload it to this site. Thanks all!Sorry folks, noticed the previous post posted last night and was unaware. Same issue this morning
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Old 01-30-2014, 12:20 PM   #5
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Year ? Engine? Sounds like belt squeal early tj 4.0 have manual serp belt tension newer spring load tensioner don't know which you have
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Old 01-30-2014, 01:28 PM   #6
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His previous post on the same subject said 2005 4.0l.

Here is what I think it is.:

If it happens at start up it is slipping on the alternator pulley. Next time you start it rev it couple of times while it is squealing then shut it down. See if the alternator pulley is HOT. Be careful. It could be very hot. If it is hot then you verified slippage. You need a new belt, if it is at least 4 years old or is glazed (shiny) or has been contaminated by an engine oil leak. If it is a relatively new belt, you need a new tensioner.
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Old 01-31-2014, 08:56 AM   #7
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Fired Willy up today......zero sounds! The below zero temps here must have been too much for parts to handle.
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Old 01-31-2014, 09:09 AM   #8
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It could be a belt slipping, but since it's a 2005 it could also be your OPDA going. Mine just started doing the same thing and since my first OPDA failed at 5k miles, I just ordered a Dorman (Camshaft Sychronizer) OPDA (Dorman part number 689-201) yesterday as it has a much better bearing design.
This is a known defect on 2005 and 2006 4.0L engines and if it turns out it is your problem it is worth getting it fixed sooner rather than later as it can destroy your camshaft. They start off squealing on cold start and then eventually will squeal all the time.
You can find more info on it on this forum board or by googling some of those terms. There are some good videos of failing OPDAs on youtube as well.
When my first one failed, I was sure it was a bad idler pulley bearing as it sounded exactly like that.
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Old 01-31-2014, 09:19 AM   #9
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This is what a really bad Oil Pump Drive Assembly (Camshaft Synchronizer) sounds like:


When they start to go, they sound like a squeal for a few second upon cold start up. Again, this is only a problem related to an extremely poor redesign that only affects the 4.0L in 2005 and 2006 model years. The factory replacements still have a crappy design. I know guys that have been through 3 of them already, so if it turns out that this is your problem, buy the Dorman unit.
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Old 01-31-2014, 10:04 AM   #10
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If it fails it can do much worse then destroying your cam shaft

If it shears off you have nothing driving your oil pump and zero oil pressure and running an engine with no oil pressure will damage lots more than your camshaft think main and rod bearings and even crankshaft
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Old 01-31-2014, 10:54 AM   #11
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That sound is pretty close. What did the OPDA repair cost ya?
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Old 01-31-2014, 11:10 AM   #12
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search for laughing monkey and you will get all the info you desire
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Old 01-31-2014, 11:29 AM   #13
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Quote:
Originally Posted by bcsatch View Post
That sound is pretty close. What did the OPDA repair cost ya?
I just ordered the part yesterday and haven't received it yet. Still haven't decided if I'm going to install it myself or bring it to a mechanic/dealer for that. If you get the timing wrong, you may not be able to restart the Jeep, or it may run in limp-home mode with a CEL and shops have computers that can help get it set up perfectly to spec. The job only takes 1 hour to do if you get it right.
Part costs $78.89 plus shipping at Rockauto. That's the best price I've seen.
( RockAuto Parts Catalog ).
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Old 01-31-2014, 11:54 AM   #14
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If that is this issue and it only "squealed" during cold starts at below zero temps, should I just ignore it until it squeals during normal temps? Or should I be on the safe side and replace it with the dorman? Way I see it, it isn't happening to every 05-06 out there. Just wondering if I need to be proactive or have a bit more time.
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Old 01-31-2014, 12:13 PM   #15
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That's a personal call. It might not even be the OPDA, it could be an idler pulley bearing or something else. Based on what I know about the Mopar design of the facotry OPDA, I'm happy to get that ticking time bomb out of my rig. My first one squealed on cold start for a few weeks and then all of a sudden, while I was out on a trail in the middle of nowhere, it failed and sounded like the one in the video. I was glad to learn my camshaft wasn't destroyed, but since it was under warranty at the time, it wasn't going to be my problem anyway. Now that it is out of warranty, and I'd have to pay for an engine teardown to replace the camshaft, I'm replacing my OPDA right away.
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Old 02-12-2014, 10:08 PM   #16
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If it is a sustained squeal then check tensioner and pulley bearings. If not sustained and intermittent squeal or chirp, take faceplate off of bell housing and look at flex plate for loose bolts or cracks. The cracks vibrating at low RPMs chirp then go away once centri force evens plate out.

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