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Old 01-03-2013, 09:12 AM   #1
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Unhappy Yj Squeal

Hi all, new to the forum.

I've had my yj for 2 years now.. and its been a downhill battle. had to replace engine, tranny.. and lots more. the list goes on. i dont mind though cause i love my jeep.

Recently there has been a squeaky noise. I can spray belt spray but it starts again after about 5 minutes. It seemed that i was loosing a little bit of coolant and my neighbor told me to check the water pump. so last night in 20 degree weather, lol, i changed the water pump and got everything put back on. I started and there was no squeaky noise for about 30 seconds. Now i dont know what to do next. i have loosened and tighten the belts. replaced the belts. and it just wont go away. I can't stand to drive it.

Any advice please let me know...

2.5L 4cyl 1990 YJ 33's 2in body lift

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Old 01-03-2013, 09:19 AM   #2
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Did you change the belt at the same time? You would need to.
Also, getting anti freeze on the pulleys will make the belt slip. I always spray brake cleaner on the pulleys to clean them just before installing the new belt. This is assuming you have a serpentine/single belt

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Old 01-03-2013, 09:21 AM   #3
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If all of your pullies look good with none out of round, and your belts are good as you have replaced them, and you have tighted the belts like you said, I would check your alternator. Remove it's belt and spin it by hand to see if you feel the bearings grinding or binding. Just my thoughts.
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Old 01-03-2013, 09:30 AM   #4
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I have just started having this issue as well, when it's cold the squeal varies by rpm, as it warms up it goes away. I'm thinking the idler pulley bearing might be going. Going to try and check it today.
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Old 01-03-2013, 10:25 AM   #5
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Well I took the idler pulley (to the right of alternator pulley) off and no aparent squeal. Will leave it off for a few days and see if it's gone for good. It hardly puts any tension on the belt, so I will have to decide if I want to put a new one on or run it without.
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Old 01-03-2013, 10:41 AM   #6
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I don't think that is a good idea. The belt has to have tension to spin the pulleys. You will over heat fast
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Old 01-03-2013, 11:01 AM   #7
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It does have good tension.

Here is a pic (not mine) that shows my setup exactly, i circled my idler pulley I removed.

Like I said, I will drive it around locally for a day or 2 and see if it is a problem running without it. Keeping the idler pulley and a spare belt in the jeep just in case.

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Old 01-03-2013, 12:36 PM   #8
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Thanks for all the input. I messed with it about 2 hours ago and i used the pry bar to get the belt even tighter...now it only squeals for like the first 30 seconds. what should i look for next??
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Old 01-03-2013, 12:37 PM   #9
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oh and its a 4cyl 2.5 liter with 2 belts.... replaced the alternator and battery within the past 7 months
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Old 01-03-2013, 12:50 PM   #10
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Take off one belt at a time and start it to see which belt is squealing? Then check the pulleys that belt drives.
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Old 01-03-2013, 01:27 PM   #11
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I know its the belt that drives the alternator. I will take the belt off and turn the alternator by hand tomorrow morning and see if i hear any grinding.. another question, Does it take time for the belts to break in?
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Old 01-03-2013, 02:40 PM   #12
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I would like not and like NewYJOwner said, check the pulleys for any signs of wear or problems.
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Old 01-03-2013, 02:47 PM   #13
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If you can safely do so, use a large screwdriver or other long metal pipe and place it on a bracket near the suspected pulley. Hold the other end to your ear. Should help magnify the noise and pinpoint the problem. I used this method to diagnose a bad idler pulley a few days ago.

Just make sure you stay away from any moving parts while doing this. Belts, pulleys, fan, etc.
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Old 01-03-2013, 03:50 PM   #14
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there is a tensioner right under the air filtrer box , make sure it is tight! if its loose it will squeel like the dude in deliverince!!
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Old 01-03-2013, 08:13 PM   #15
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i had the same problem, i tried everything and belt dressing only made it worse. out of frustration and a last ditch attempt to make the squeal stop i sprayed a small shot of silicone lube on the belt while it was running and to my amazement my squeal is a thing of the past.

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