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-   -   Pulley noise (http://www.jeepforum.com/forum/f310/pulley-noise-2179841/)

TSGR 03-04-2014 05:26 PM

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.

heitzman 03-04-2014 05:40 PM

Belt tensioner

shockracer 03-04-2014 05:53 PM

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.

heitzman 03-04-2014 06:47 PM

Remove your belt tensioner pulley and you will be able to tell if its bad.

TSGR 03-05-2014 11:30 AM

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.

Double E 03-05-2014 11:32 AM

Alternator is next... mine was replaced but not due to noise.

TSGR 03-05-2014 11:55 AM

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.

soonerdg 03-05-2014 12:12 PM

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.

heitzman 03-05-2014 01:14 PM

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.

shockracer 03-05-2014 01:28 PM

Take the belt off and rotate the accessories by hand, you should be able to feel a worn bearing.

TSGR 03-05-2014 02:43 PM

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.)

TSGR 03-05-2014 02:59 PM

Also started it without the belt and couldn't hear it

heitzman 03-05-2014 03:00 PM

timing chain tensioner? Have you started it with the belt off?

TSGR 03-05-2014 03:12 PM

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?

soonerdg 03-05-2014 04:09 PM

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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