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Old 08-04-2009, 10:23 PM   #1
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Question Chirp'n Squeal... GRRR!!

Ok, I've searched the forums on this but not found what I'm looking for.

I currently have a '93 YJ with 6 cylinder. It has the crank pulley, alternator pulley, power steering pulley. The fan/waterpump is a smooth pulley and the idler pulley is smooth as well.

When I got the jeep, it was chirping and had torn the edge off the belt. I eyeballed everything with a string in place of the belt which I removed. The alternator was sitting back so I spaced it forward. I replaced the belt with a new one and still I get a chirp chirp chirp. I've spaced alternator and idler pulley in all sorts of configurations. I thought I had the noise gone last night, but then it came back. I've tried all sorts of tensions on the belt but nothing makes it go away. I looked last night and thought it looked like the front edge of the belt might be hitting the outtermost edge of the crank pulley so I put some candle wax on it while it was running. Noise went away. So I figured maybe the alternator was too far out now and pushing the belt towards the front of the crank pulley. Pulled one washer/spacer out of the alternator stackup. chirp chirp chirp. GRRRR!!!

Any ideas on how to make this noise go away? I started the jeep briefly with the belt off and there's no chirp. So it's def. something related to that. Bad pulleys? There's no wobble to any of them with jeep idling.

Driving me nuts... any ideas on what else to do? Besides converting to electric water pump, fan and power steering? lol

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Old 08-05-2009, 11:37 PM   #2
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Old 08-06-2009, 08:25 AM   #3
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i have same prob but mine only does it when its cold
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Old 08-06-2009, 12:09 PM   #4
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Well I think I got rid of the chirp, though I'm not happy with how it is at the moment. I rerouted the belt, while keeping the pullies rotating in their correct directions. I'm not sure what the difference is, but for now it's working. The only thing I don't like is that I have the belt going over the top of the smooth idler pulley, not underneath it. So I'm now trying to find a grooved idler pulley to put in it's place. Short of leaving the belt off, this is the only thing I've done that has put a muzzle on that chirpchirpchirpchirpchirp.

Actually, this brings up the question about running the ribbed serpentine belt over the top of the smooth pulley. It sort of freaks me out, thinking that it's going to slip off the pulley. Everyone local to me says it won't since it's guided by the alternator, crank and power steering pullies.

So... what's the general thought on this? Go ahead and find a grooved pulley? Leave the smooth one there and just drive the thing?

thanks.
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Old 08-06-2009, 01:39 PM   #5
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try some running some bar soap on the belt...
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Old 08-06-2009, 02:28 PM   #6
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Tryb conditioning the belt like mentioned otherwise it's sounds like a bad pulley or bearing somewhere. The Pulley/Bearings in my Dodge Alt went out a few months back & dam did that thing squeal.

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Old 08-09-2009, 09:40 PM   #7
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sounds like the idler pulley was the culprit if its working don't screw with it unless u got the cash
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Old 08-09-2009, 09:52 PM   #8
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My alternator made this horrible noise cause i had it in the IL river a few times had to by a new alt. and the problem was gone
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Old 12-04-2009, 10:35 PM   #9
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Sorry to resurrect an old thread but I might have help. My 06 Unlimited started squealing yesterday too. Three drops of bearing oil on the bearing of the idler wheel made it go away immediately. After 110km, or about 80 miles so far so good, no squeal.
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Old 12-05-2009, 04:12 PM   #10
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1st put the belt the way it is suppose to be. 2nd are you sure the chirp or squeak isn;t coming from the water pump? They will start chirping when they start going back. Do you see any coolant leaking out of the pump?

The belt must be run the correct way or you will have problems later. Running it any otherway can put unwanted stress on pulleys and what not.

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