So, we have this jeep that makes a noise - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 05-28-2012, 10:36 AM   #1 (permalink)
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So, we have this jeep that makes a noise

I know, surprise surprise And yes, this is tech and I don't care that this isn't the place for it and I don't want to post it in the jeep forums. I don't like it there

The stats...1995 4cyl YJ. it came to us very cheap, so that makes it tolerable, except for the fucking squealing noise that it randomly makes. It doesn't do it all the time and you can't make it do it when you want to hear it. it squeals when you are driving. It squeals when you are idle. It does seem to squeal more when you decelerate. The part that is maddening is that we can't quite figure out where the noise is coming from. When I first heard it I thought throw out bearing, but its so random that I don't think its that. Then Robert thought it was the pilot bushing, but now he's leaning toward something in the alternator. Its really not like a belt squealing sound...its almost like a high pitched vacuum squeal. Robert can't get it to squeal when its idling long enough to track it down.

Ok...tell me what it is Seriously, I know you can't help much but any ideas are helpful
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Old 05-28-2012, 10:41 AM   #2 (permalink)
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idler pulley...maybe.
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Old 05-28-2012, 10:41 AM   #3 (permalink)
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ScottFJ40's ghost haunting you.

When you hear that squeek you will thing of Scott.

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Old 05-28-2012, 10:42 AM   #4 (permalink)
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Serpentine belt tensioner pulley?
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Old 05-28-2012, 10:47 AM   #5 (permalink)
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A pilot bearing will definitely stop if the clutch is engaged. A release bearing should change the sound with foot pressure.
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Old 05-28-2012, 10:50 AM   #6 (permalink)
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Ignore it. It's a Jeep thing
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Old 05-28-2012, 10:50 AM   #7 (permalink)
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Quote:
Originally Posted by krawlr View Post
A pilot bearing will definitely stop if the clutch is engaged. A release bearing should change the sound with foot pressure.
It does it with the clutch in or out.
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Old 05-28-2012, 10:59 AM   #8 (permalink)
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I have heard water pumps squealing before also.
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Old 05-28-2012, 11:01 AM   #9 (permalink)
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Muffler bearring.....
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Old 05-28-2012, 11:03 AM   #10 (permalink)
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Muffler bearring.....
I had those changed before Robert got home
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Old 05-28-2012, 11:03 AM   #11 (permalink)
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I have heard water pumps squealing before also.
I'd agree. Fast way to check is to pull the belt and see if you can move the shaft.
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Old 05-28-2012, 11:06 AM   #12 (permalink)
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My YJ has an occasional squeal like that from the distributor bushing. It gets dry and squeaks/squalks for a while, or sometimes just for a few seconds.
When it won't go away, I pull the distributor and lube the oil hole with gun oil or pb blaster. sometimes I have to lube it then spin the gear a while. You will feel it "free" up, as it will become easier to spin. frees it up for a while.
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Old 05-28-2012, 11:07 AM   #13 (permalink)
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Like a "Tinny" squeak? A heat shield or exhaust rubbing on something?

Next time it does it, put your foot on the tailpipe tip and see if that changes it.

Nice, chit-chatting with you
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Old 05-28-2012, 11:09 AM   #14 (permalink)
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I'd agree. Fast way to check is to pull the belt and see if you can move the shaft.
I've heard exactly that symptom & cause on a YJ.

I'd say just being able to turn the shaft wouldn't automatically rule it out, unless it spins smooth and feels nice and tight.

But hey, could be the power steering pump, alternator, or any other pulley, too.
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Old 05-28-2012, 11:10 AM   #15 (permalink)
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I'd agree. Fast way to check is to pull the belt and see if you can move the shaft.
Even easier, pull the belt and start the engine. Still squealing, it isn't an accesory.
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Old 05-28-2012, 11:10 AM   #16 (permalink)
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I'd agree. Fast way to check is to pull the belt and see if you can move the shaft.
Sounds hot
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Old 05-28-2012, 11:25 AM   #17 (permalink)
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Turn the volume control knob to the right, to eliminate the squeal. Keep turning, until it disappears.
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Old 05-28-2012, 11:27 AM   #18 (permalink)
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Bad brake booster did that on mine..... but mine's the old 4.2...
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Old 05-28-2012, 11:31 AM   #19 (permalink)
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Had a 2000 grand Cherokee alt do that. Drove me nuts. The bearing in the rear of case had gone bad.
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Old 05-28-2012, 11:41 AM   #20 (permalink)
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I'd agree. Fast way to check is to pull the belt and see if you can move the shaft.
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Sounds hot
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Old 05-28-2012, 11:47 AM   #21 (permalink)
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Clockspring.

Roxy queen of the double standards.
Move this sH|t to tech.
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Old 05-28-2012, 11:51 AM   #22 (permalink)
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Its a jeep, sell it and buy a toyota, problem solved
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Old 05-28-2012, 12:02 PM   #23 (permalink)
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I had a customer's 4.0 make a noise like that. The intake bolts had loosened, and the metal intake manifold gasket was acting like a kazoo. Do the 4 cylinders use metal intake gaskets?
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Old 05-28-2012, 12:11 PM   #24 (permalink)
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Twice now I have had customer's Jeeps in here with the same symptoms. In both cases, I found the intake to be cracked. Temperature can cause the crack to open, and the vacuum being pulled makes one heck of a racket. Look very closely at the intake, to the extreme front and rear. I have also seen too many cases where the stud holding the manifolds fatigues and just snaps off. Look to see if they might be missing. Once again, they are at the extreme ends of the manifolds. Good luck!
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Old 05-28-2012, 12:19 PM   #25 (permalink)
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Im putting my money on idler pulley bearing.

replace those... they arent expensive, so its easy.

Alternators usually WHIRRRR instead of squeek.

You should be able to tell if the sound is coming from the front of the engine or the rear just by listening.

When in doubt, get a wooden rod and put it on the front of the engine when it is running (WATCH OUT OF THE FAN AND PULLEYS!!!) Then compare the noise level to the rear.

If you are cautious, you can take the wooden dowel and put it on the back part of the alternator housing (NOTE I SAID TO USE WOOD DOWL NOT METAL!!) listen for noise. Now compare to the AC compressor, then to the steering pump, then to the idler pulley (put the dowel on the bolt, but be careful damnit!)
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