Pulley noise - JeepForum.com

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post #1 of 23 Old 03-04-2014, 05:26 PM Thread Starter
TSGR
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Pulley noise

Metal on metal noise coming from a pulley on my 4.7. I can't tell which one it is, I was wondering if any are common or prone to failure.

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post #2 of 23 Old 03-04-2014, 05:40 PM
heitzman
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Belt tensioner
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post #3 of 23 Old 03-04-2014, 05:53 PM
shockracer
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I would replace the idler pulley and tensioner pulley, maybe even the tensioner assembly. Check your belt well you're under there, it maybe time for one as well.

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post #4 of 23 Old 03-04-2014, 06:47 PM
heitzman
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Remove your belt tensioner pulley and you will be able to tell if its bad.
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post #5 of 23 Old 03-05-2014, 11:30 AM Thread Starter
TSGR
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well i replaced the idler and tensioner pulley today, the noise is still there. I also bypassed the a/c compressor, that's not it either.
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post #6 of 23 Old 03-05-2014, 11:32 AM
Double E
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Alternator is next... mine was replaced but not due to noise.

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post #7 of 23 Old 03-05-2014, 11:55 AM Thread Starter
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I'll just wait to have it checked out when I get it inspected. Done throwing parts at it, already wasted over $60 between the pulleys and the shorter belt to bypass the a/c.
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post #8 of 23 Old 03-05-2014, 12:12 PM
soonerdg
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I'd get it checked out sooner rather than latter. There are only two pulleys left, alternator and water pump. If the pulley is making that kind of noise it's because the bearing is toast. It will fail rather quickly.
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post #9 of 23 Old 03-05-2014, 01:14 PM
heitzman
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Take your belt off and start it up and see if it is still there, but don't leave it running to long. Get back with us.
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post #10 of 23 Old 03-05-2014, 01:28 PM
shockracer
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Take the belt off and rotate the accessories by hand, you should be able to feel a worn bearing.

2001 WJ 60th anniversary edition 4.7 quadra-drive
5" hybrid lift, 265/70/17 Guard Dogs load E, bilsteins 5100's, addco sway bars, JKS front quick disco's, JKS adjustable track bar, KOR durometer track bar bushings, IRO crucial path front L.A.s, 1.25" Spidertrax spacers

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post #11 of 23 Old 03-05-2014, 02:43 PM Thread Starter
TSGR
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I turned the pulleys by hand and didn't feel or hear anything abnormal. It only makes noise at a certain rpm range, just above idle and upon deceleration, sometimes at idle (seems worse when it's really cold out.)
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post #12 of 23 Old 03-05-2014, 02:59 PM Thread Starter
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Also started it without the belt and couldn't hear it
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post #13 of 23 Old 03-05-2014, 03:00 PM
heitzman
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timing chain tensioner? Have you started it with the belt off?
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post #14 of 23 Old 03-05-2014, 03:12 PM Thread Starter
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Yes I started it without the belt and could not hear the noise. But like I said it's intermittent. The only thing I noticed is the ps pump pulley doesn't turn as freely as the others. Normal or no?
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post #15 of 23 Old 03-05-2014, 04:09 PM
soonerdg
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Well depending on how bad the bearing is it may only make noise when the belt is on and it's under tension. I've always been able to pinpoint the bad pulley just by opening the hood and litening to the front of the motor. It's usually pretty obvious which pulley is grinding.
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