post #1 of Old 12-27-2007, 09:44 AM Thread Starter
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Join Date: Dec 2007
Location: Colorado
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5.9 serpentine belt... help!

ok guys... my first thread and I need some help because this is driving me crazy!

I got my 5.9 in February 07 and about a month later, the serpentine belt started squealing. I used some belt conditioner and that helped for about a day, then it started back up. After a few weeks, the squeal only got worse... so I finally replaced the tensioner. This lessened the noise, but the squeal was still present. The local garage suggested replacing the belt, so I did and it was fixed! Or so I thought...

Not too long after this, my rear-end gave out so the jeep was parked for a few months. But I just put a new rear-end on it and am driving it again (yay!). But now, after driving about 200 miles, the stupid belt is squealing again!!!!!!!


The only thing I can figure now is that I have a pulley that is causing the belt to wear unevenly....?

Please help!

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post #2 of Old 12-27-2007, 10:12 AM
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1993 ZJ 
Join Date: May 2006
Location: Upstate, NY
Posts: 2,955
Very well could be your water pump. With the belt off check the shaft to the WP see if there is any play

1993 Jeep Grand Cherokee Limited 4.0L I6
- OME Springs - 30"x9.5" Yokohamma's A/T-S -RE Shocks - JKS Quicker Disconnects - FM70 - E-Fan Conversion - 249->242 Swap -

1970 Jeepster Commando 225 V6
32"x11.5" BFG A/T
4" Lift

"For every one thing I fix two things break"
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post #3 of Old 12-27-2007, 10:27 PM
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1998 ZJ 
Join Date: Nov 2007
Posts: 238
could also be the idler pulley and/or tensioner pulley bearings are shot. They are pretty cheap at and easy to replace, I just did both on my 5.9 as a preventative measure at the same time I did the water pump (Pepboys) and ASP underdrive crank pulley ( to replace my bent stock one.
Obviously a new belt at the same time is also a smart move.
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