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Old 04-04-2012, 08:55 AM   #1
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belt problems please help me

I have a 2003 Jeep wrangler 2.4l without ac. I have replaced the serpentine belt 3 times. When i do it runs. i run it for 20 mins to make sure everything looks alright. i ran it for 15 miles yesterday then shut it down. then 3 hours later i ran it again for 15 miles then shut it down to get gas. I started it back up everything was fine. so i drove home. Then last night I statred it to go to the store it started fine and ran fine to the store. but right before i got to my house the belt shredded. does anyone have any ideas. I have replaced the tension pully and the idler pulley. and also the pulley where my ac would be but i dont have ac.

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Old 04-04-2012, 11:23 AM   #2
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Something is not square, I had the same problem with a 4 cyl engine. my water pump was tilted... How that happened? No idea. Got a new one and problem fixed. Check your alternator also.

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Old 04-04-2012, 11:36 AM   #3
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The pulley where the AC would be? What do you mean by that?
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Old 04-04-2012, 11:42 AM   #4
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Originally Posted by SOILEAU View Post
The pulley where the AC would be? What do you mean by that?

Serpentine Belt Routing - 2

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Old 04-04-2012, 11:43 AM   #5
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Are you absolutely sure you installed the new belt correctly and that it wasn't damaged?

What type of belt did you take off and what did you use to replace it with? Part numbers?



The reason I ask, I've seen this happen before on another Chrysler vehicle.

I have a 2000 Dodge Grand Caravan and when it came time to replace the belt, I bought a typical replacement from a local auto shop. 3 weeks later, the belt shredded. I took it back and they replaced it. That one shredded 3 hours after installing it. I took it back, got a different brand. It shredded in 5 days. Got another one, but the belt squealed.

I put it on a shop, had the idler pulley and tensioner changed. same thing.

I removed the alternator and had it checked. Everyone was telling me to change the belt, it was bad. How can that be? It's brand new? And it keeps breaking belts!


So, after having to go get my wife on the road a few more times, I decided to change the TYPE of belt.

That solved my problem, no more breaking. I did some research and found this to be not all that unusual with those vans, and that Chrysler actually did a recall on the years BEFORE my vehicle for the exact same thing! Mine was effected, but not included. It even baffled the techs at the dealership.


Now, The belt I got was a Dayco brand Poly COG type. Nothing else would work.

But, and here's the kicker, Dayco no longer makes that belt. They make that same part number, but it's not a poly COG, it's a poly RIB. Big difference.
Why the hell someone would give something different the same PN is beyond me.

Point being, you could go around in circles, check to see if a poly COG will work or if that's what you are using.
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Old 04-05-2012, 06:45 AM   #6
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What was the condition of the first belt? Was it intact or was it shredded like the new ones you are speaking of?

If the original belt was intact, your problem may be with the installation of the idler pulleys, especially on the one with the adjustment bolt. The spacer will fall off upon removal and if not reinstalled, the idler will jam against the adjustment bracket upon reinstallation. The idler pulley will look like it is aligned properly. When the engine is running, the pulley will not be turning, allowing the belt to drag over the jammed pulley. It wont squeal and will appear to be operating normally until the friction heat created by the jammed idler pulley causes the belt to self destruct. Make a mark on each pulley. Use a light to observe and verify the rotation of each pulley while engine is running.
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Old 07-12-2012, 04:00 PM   #7
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A/C bypass pulley

Do you have a pulley in place of A/C compressor? My A/C locked up and needing to know can I put a Idler pulley in its place.

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