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Strange metal on metal sound...


 
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eggdashure
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Joined: 09 Feb 2006

PostPosted: Thu Feb 16, 2006 6:35 pm    Post subject: Strange metal on metal sound... Reply with quote

Hey all,

So here's the deal. I am hearing a metal on metal sound from the front of my engine. At first I thought it might be my brake rotors, but I eliminated that. I think I've narrowed it down to something connected to my serpentine belt. Is there a good place to start looking, and what would I look for? Is there something that wears out more than something else?

Thanks,
Matt
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ILLXJ
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Joined: 08 Aug 2005
Location: S. ILL.

PostPosted: Thu Feb 16, 2006 7:32 pm    Post subject: Reply with quote

Check the harmonic balancer. They tend to seperate & rub on the timing chain cover. JIM.
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Last edited by ILLXJ on Mon Jan 31, 2011 11:03 pm; edited 1 time in total
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catheadred
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Joined: 17 Feb 2006
Location: claxton,gerogia

PostPosted: Fri Feb 17, 2006 5:30 pm    Post subject: Reply with quote

it depends on wether you hear the sound only when moving or only when stopped or all the time.here are a few things to look for if the noise is all the time. waterpump,serpintine belt tensioner pulleys,alternator bearings.
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eggdashure
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Joined: 09 Feb 2006

PostPosted: Wed Feb 22, 2006 6:53 am    Post subject: Reply with quote

I have a question which may or may not help me narrow this down.

I was on a long trip over the weekend and noticed that the sound is consistent with vehicle speed. I would think if it were something connected to the engine, it would be consistent with engine speed...right?

Thanks,
Matt
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JeepinNH
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Joined: 13 Sep 2005
Location: New Hampshire

PostPosted: Wed Feb 22, 2006 7:09 am    Post subject: noises Reply with quote

Does it happen louder around corners, is it at low speed or high speed? Assuming it 4x4 the front axle u-joints make all kinds of noises when they need replacing. You may want to jack up each side of the front and spin the wheels listening for noises. If it was a noise from the engine it would change with the RPMs not vehicle speed.
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Mike

Present: 99 Cherokee
Past: 86, 87 Cherokee; 94 Grand Cherokee
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eggdashure
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Joined: 09 Feb 2006

PostPosted: Thu Feb 23, 2006 6:45 am    Post subject: Reply with quote

I hear it loudest, or at least most pronounced around 40MPH. After that it stays pretty much constant. It's not any louder cornering. I suspected the U-Joints as well.

Now for the question, are they difficult to replace?
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JeepinNH
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Joined: 13 Sep 2005
Location: New Hampshire

PostPosted: Thu Feb 23, 2006 10:09 am    Post subject: u-joints Reply with quote

They are quite time consuming to replace but if you've replaced u-joints in a driveshaft then you can do it. The toughest part is pulling the hub/brearing assembly out of the axle. It's only 3 or 4 bolts but is tough because it gets rusty. Any decent repair manual will tell you how it's done. I would suggest you make sure they are bad before you bother replacing them.
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Mike

Present: 99 Cherokee
Past: 86, 87 Cherokee; 94 Grand Cherokee
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eggdashure
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Joined: 09 Feb 2006

PostPosted: Thu Feb 23, 2006 8:43 pm    Post subject: Reply with quote

How would I know for sure that they are bad? Just spin the wheel and listen, or is there something more scientific involved? Mr. Green

Matt
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JeepinNH
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Joined: 13 Sep 2005
Location: New Hampshire

PostPosted: Fri Feb 24, 2006 4:06 pm    Post subject: u-joints Reply with quote

Yep, that's about it. Also turn the wheel some and spin it. Watch the joint, if it's sloppy, notchy or noisy then they're toast. You can usually see rust where it pivots if it's bad. It's hard to miss a bad one.
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Mike

Present: 99 Cherokee
Past: 86, 87 Cherokee; 94 Grand Cherokee
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