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Unread 03-04-2014, 05:26 PM   #1
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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Unread 03-04-2014, 05:40 PM   #2
heitzman
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Belt tensioner
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Unread 03-04-2014, 05:53 PM   #3
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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Unread 03-04-2014, 06:47 PM   #4
heitzman
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Remove your belt tensioner pulley and you will be able to tell if its bad.
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Unread 03-05-2014, 11:30 AM   #5
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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Unread 03-05-2014, 11:32 AM   #6
Double E
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Alternator is next... mine was replaced but not due to noise.
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Unread 03-05-2014, 11:55 AM   #7
TSGR
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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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Unread 03-05-2014, 12:12 PM   #8
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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Unread 03-05-2014, 01:14 PM   #9
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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Unread 03-05-2014, 01:28 PM   #10
shockracer
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Take the belt off and rotate the accessories by hand, you should be able to feel a worn bearing.
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Unread 03-05-2014, 02:43 PM   #11
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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Unread 03-05-2014, 02:59 PM   #12
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Also started it without the belt and couldn't hear it
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Unread 03-05-2014, 03:00 PM   #13
heitzman
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timing chain tensioner? Have you started it with the belt off?
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Unread 03-05-2014, 03:12 PM   #14
TSGR
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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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Unread 03-05-2014, 04:09 PM   #15
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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