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Unread 02-14-2013, 12:33 PM   #1
AndrewMcD
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1997 ZJ 
 
Join Date: Feb 2011
Location: Boston, MA
Posts: 13
4.0 Engine Squeal at Idle

Hi everyone, I've searched as much as I can and am pretty sure I've found an answer but I just wanted to post here to make sure I'm correct.

I've got a wicked squeal coming from the front of my motor but only at idle. I'm pretty sure I've got it narrowed down to the water pump, more specifically the waterpump bearing.

Here is a video I took, the noise can be heard pretty clearly:
https://www.youtube.com/watch?v=1N7lxe1whpU

Thanks.

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Unread 02-14-2013, 02:21 PM   #2
96zedjay
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1996 ZJ 
 
Join Date: Jun 2012
Location: Cincinnati, Ohio
Posts: 311
Could be an idler pulley bearing as well. Take a 3 or 4 foot piece of heater or garden hose and put one end near your ear and probe around with the other.
This will pinpoint the culprit. Be carefull of the fan and moving parts.
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Unread 02-14-2013, 03:01 PM   #3
zjsean
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1996 ZJ 
 
Join Date: Mar 2009
Location: Port Deposit, MD
Posts: 88
Mine had a wicked squeal that has been driving me nuts. Turned out to be the A/C clutch pulley. I took the belt off and gave everything a spin one at a time to see if I could hear anything. I could def hear a difference in the A/C pulley. Hosed it down with some good ole WD-40 for now, put the belt back on and no squeal now. I'm sure it'll be back though.
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Unread 02-14-2013, 03:16 PM   #4
AndrewMcD
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1997 ZJ 
 
Join Date: Feb 2011
Location: Boston, MA
Posts: 13
I noticed that the crank pulley seemed to be wobbling around quite a bit, I'm doubt it's supposed to do that normally. That could be the culprit too?
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Unread 02-14-2013, 03:27 PM   #5
zjsean
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1996 ZJ 
 
Join Date: Mar 2009
Location: Port Deposit, MD
Posts: 88
From what I've heard, if the rubber is separating from your harmonic balancer that's prob it. Supposedly you can get a compact puller to pull it without removing the radiator.
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Unread 02-14-2013, 08:21 PM   #6
savannahzj
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1998 ZJ 
 
Join Date: Apr 2011
Location: savannah, ga
Posts: 191
If the crank pulley is wobbling, that's my bet. I just went through this. I thought it was the a/c pulley as well. I had to remove the rad. because of the puller that I had on hand. The unintended benefit was that the jeep idled alot smoother after installation!
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Unread 02-14-2013, 09:16 PM   #7
jtackerman28
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1997 ZJ 
 
Join Date: Nov 2011
Location: Flint, Michigan
Posts: 2,131
Most cases of jeep squeak are the alternator slipping and most think it is the ac because when the ac kicks on the volts it draws throws a load on the alt. a good quality belt will stop the squeak I'm this situation (gator back, gates)

Just fixed mine
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Unread 02-15-2013, 05:53 AM   #8
AndrewMcD
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1997 ZJ 
 
Join Date: Feb 2011
Location: Boston, MA
Posts: 13
Quote:
Originally Posted by jtackerman28 View Post
Most cases of jeep squeak are the alternator slipping and most think it is the ac because when the ac kicks on the volts it draws throws a load on the alt. a good quality belt will stop the squeak I'm this situation (gator back, gates)

Just fixed mine
To me it sounds more like metal on metal contact than rubber slipping. I'm going to be replacing a few parts here and there to try and narrow it down.
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Unread 03-07-2013, 08:29 PM   #9
rbrweb
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1996 ZJ 
 
Join Date: Jan 2013
Location: Mexico City, Mexico DF
Posts: 51
Mine had the same noise and i change the idle pulley, that stops the noise at the begining, after 2 weeks the sound came again and i had to change the harmonic balancer, that solution the problem definetely.
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