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Old 01-18-2014, 03:08 PM   #1
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Question 03 TJ Belt Squeal 2500+ rpm

Has the inline 6. Doesnt squeal at idle or when im sitting parked but often times when i am driving and the engine is under load the belt will start to squeal when i hit around 2500+ rpm's. Sometimes it varies between 2200 rpm or 3000 rpm before squealing. It is definitely a belt squeal though. I thought the belt might be slipping and needed to be tightened so I tried looking for a belt tension adjustment bolt but it looks nothing like my Cherokees did to tighten the belt. Any ideas? Could it be a pulley going out or just need a new belt?
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Old 01-18-2014, 03:10 PM   #2
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Most likely the belt has never been changed. Change it out and tension it properly and I am betting it will go away. Make sure there also is not unrealistic resistance from the parts on the pulley system.

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Old 01-18-2014, 03:18 PM   #3
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Sounds good, how exactly do i loosen/tighten the belt?
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Old 01-18-2014, 03:33 PM   #4
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Quote:
Originally Posted by SeahawkTJ View Post
Sounds good, how exactly do i loosen/tighten the belt?
Your '03 has a spring loaded belt tensioner pulley on the passenger side of the belt routing path. Insert the stud of a ratchet wrench into the pulley's mounting arm square opening meant for this use and rotate the ratchet wrench in the direction that moves the pulley away from the belt so it can be removed.
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Old 01-18-2014, 03:36 PM   #5
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if that doesnt fix it check your fan clutch. when mine locked up it did the same thing, any RPM over 3000rpm would make a squeal
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Old 05-27-2014, 06:13 PM   #6
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To bring this back...

Replaced the belt. Fixed the problem for about a week. Then the squeal came back. Next should I replace the tensioner pulley assembly? Searched but didn't find much info online regarding the tensioner.
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Old 09-02-2014, 11:43 AM   #7
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I see no one answered your very last question BUT seeing how it's been months since you posted I'd like to know if you found the solution??? I having the exact same problem and replaced my belt as well.
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Old 09-02-2014, 11:58 AM   #8
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When I had intermittent squealing, I had it at different times and different RPMs. Usually at higher RPMs though. The belt had just been recently replaced. So with the hood up and the engine idling I could hear the idler pulley rattle. Replaced that and the tensioner pulley for good measure as both were bad. I also changed to a Goodyear Gatorback belt and that even helped quiet down the engine compartment.
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Old 09-02-2014, 07:30 PM   #9
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Could take the belt off and check all the pulleys for play by spinning each by hand and wiggle them to feel any looseness or any sound, sequel could be the bearings in a tensioner starting to go out if the belt is new or looks good.
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Old 09-06-2014, 12:23 AM   #10
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bringing this back once again..... soooooo I got a new belt and same thing, it fixed the problem for a few weeks maybe... Then it came back with vengeance, I realized the squeal went away when i turned on my a/c... to easy right?? a/c clutch pulley.... so b4 that got any worse i grabbed the shorter belt and bypassed my a/c compressor... idk when they changed it but my set up as to where my a/c, alternator and idler pulleys are quite different from other pics I've seen for TJ's.... anyway, most of the noise went away but now at around 4000rpm i think my belt begins to slip....
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Old 09-06-2014, 03:58 AM   #11
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Try belt dressing. It prolongs the life of belts from keeping them from drying out. It also makes them tacky. It may help if it's slipping do to being a tad big with your new setup. If one of your components is failing like the fan clutch, alternator etc. The only real fix is to replace the component.
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Old 09-06-2014, 11:13 AM   #12
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Try belt dressing.
Can you provide the name of one belt dressing type that doesn't state "Not recommended for serpentine belts" (or words to that effect) on the can?

Keep the dressing on your salad and off your car's serpentine belt - NWautos
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Old 09-06-2014, 11:23 AM   #13
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I'd stay away from belt dressings, they had their place for v-belts, but will cause more problems with a serpentine belt, better to find the problem then quiet it.

The belt tensioner and the multigroves should prevent a sequel, unless the tensioner is not doing its job or it is coming from something other then the belt, like a bearing in the pullies, tensioner, ac or alternator or one of them is starting to bind up or create enough drag to have the belt squeal trying to spin it.

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