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Old 09-06-2012, 12:38 AM   #1
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squeaky belts

I just bought my first Jeep and I love it...only problem is the belts squeak horribly...the guy I bought it from rebuilt a motor and replaced the alternator and the serpentine belt...I've tried wd-40 it helps for awhile then back to squeaking!! any ideas? This is my first post so I hope I'm in the right place...its a 97 Wrangler tj

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Old 09-06-2012, 01:31 AM   #2
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Is it a new belt? Is it tightened properly? There is a belt dressing product you could get, not sure of the name though. Are you sure it's the belt and not one of your pulleys? Also check the belt tensioner, could be wore out as well.

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Old 09-06-2012, 01:40 AM   #3
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It is a new belt I'm going to check how tight it is in the morning I put the wd40 on the pulleys but it only helps for about an hour
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Old 09-06-2012, 08:52 AM   #4
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squeaky = problem

The squeaking indicates that there is a problem someplace. First do a thorough check for physical problems
1. wrong belt (6 groove instead of 5)
2. misaligned pulley. You can usually sight along the belt and see if one pulley is out of alignment.
3. check for bent pulleys. One pulley may be bent and not running true.
4. check for bad bearings in all of the pulleys. Remove the belt and check each pulley individually.
5. check each component to be sure that someone didn't replace a pulley with the wrong groove count.

The squeaking comes from one of the ribs rubbing, and sliding, against one of the grooves on a pulley. Just gotta find out which one.
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Old 09-06-2012, 12:11 PM   #5
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Ok so after checking everything out I believe its the bottom most pulley on the engine block...when I used wd40 on it it stopped until I'm accelerating but once I'm at sputtered or idling there is no noise
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Old 09-06-2012, 06:15 PM   #6
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Is that the Crank pulley you are referring to???
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Old 09-08-2012, 10:18 AM   #7
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Yes...after checking them all and replacing the belt it only Squeaks when its first started or in 4wd
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Old 09-08-2012, 12:58 PM   #8
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take a tube of silicone sealant like you use on your auto or home..squeeze some on your finger and then just wipe it on your belt in a couple of places,then start it up and let it run a minute..this is what many automotive shops use..it does not take much and of course color does not matter
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Old 09-10-2012, 12:46 PM   #9
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Ok ill give that a shot thanks for the tip!
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Old 09-11-2012, 01:25 AM   #10
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Quote:
Originally Posted by qgalloway View Post
Yes...after checking them all and replacing the belt it only Squeaks when its first started or in 4wd
I had similar noise on my 97. I fixed it with a new serp belt, cheapest they sell. But I still had a very high pitched noise when raced the engine to 5k rpm's. Replaced both pulleys. They are cheap, plus being 15 years old, why not. Problem fixed completely. The old pulleys spun freely by the way.
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Old 09-11-2012, 04:21 PM   #11
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sometimes when its just the belt your can take a bar of soap that you would use in the shower and hold it on the under side of the belt that actually makes contact with the pullys.. that also helps with noise. however it can be very dangerous to hold a bar of soap under a belt while the engine is running and the fan right next to your hand. lol not safe not reccomending doin so unless your ccomfortable working on cars... good luck with your problem.
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Old 09-11-2012, 04:34 PM   #12
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Quote:
Originally Posted by qgalloway View Post
Yes...after checking them all and replacing the belt it only Squeaks when its first started or in 4wd
that squeal while starting is most likely a loose belt. tension to roughly .5" deflection between widest pulley span.. good luck with it...
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Old 09-12-2012, 12:58 PM   #13
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Ill check it out thanks!
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Old 09-13-2012, 08:00 AM   #14
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squeal when starting

The squeal when starting is typically caused by the alternator. When you first start the car the battery voltage is low from just expending energy to turn the starter. This causes the alternator to put out maximum until the battery voltage comes up and the regulator cuts it back. That added load causes the alternator to slip on the belt.

The alternator can put out from 100A to 200A. At 150A, that is 2.2KW or about 3 horse power. That is equivalent to turning a 3 horse power motor at full load. During that time, and as long as the alternator is putting out significant amperage there will be a very high pitched whine. That is the brushes singing in the alternator. It should subside as the battery gets charged and the load decreases. Used to be you could demonstrate that by pulling the field wire off the alternator, cutting its output and the sound would stop.

There is a difference between a squeak and a squeal. A squeaking belt will be caused by the ribs rubbing the edges of the pulley(s) as it settles into the grooves. That is a very rapid, short sequence of squeaks.

A sqealing belt is caused by the belt slipping on the pulley and is a long, solid sound. Each has a different sound and a different cause. If we can learn the language of our vehicle we can pretty well diagnose most of the common problems with either our eyes, ears or our hands, or a combination of both.

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