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Old 11-08-2011, 07:43 PM   #1
limenuke
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Exhaust Rattle

http://www.youtube.com/watch?v=0QnkuNQqMfE

My car's been rattling at 30kmph+. Frined told me to get under my car and tap things with a mallet. Video is shot from directly behind the front passenger wheel, underneath the car. I hit the offending piece of metal (a large metal shell) a couple times with the mallet...and then I hit the exhaust pipes to demonstrate the overall noise. Lo and behold that thing around the exhaust system is loose. What is it / what can I do?

Also, the last part of the video shows my jack stands. That's the front cross member right ? Is it a good place to put my stands?

Last edited by limenuke; 11-08-2011 at 07:48 PM.
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Old 11-08-2011, 08:38 PM   #2
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depends where it is. i've had a loose exhaust bracket that i just removed and didn't replace. whether or not that is a big deal i don't know. personally i don't think so. my car have a few exhaust brackets. sometimes they rust through, get loose and rattle. so i just took it off. now it no longer rattles. that was over a year ago now and its fine.
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Old 11-08-2011, 09:44 PM   #3
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http://realoem.com/bmw/showparts.do?...53&hg=18&fg=10

The part I was tapping wiht my mallet were the pieces of metal on part 1... The sectioned portions immediately to the right of the label 1. They are loose.
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Old 11-08-2011, 10:56 PM   #4
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^ are they the actual pieces that are rattling against each other? or is there something loose that may be rattling against them?
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Old 11-08-2011, 11:18 PM   #5
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The actual pieces. They are loose on the tubes.
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Old 11-09-2011, 03:34 AM   #6
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Those are the shields on the cats.
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Old 11-09-2011, 12:41 PM   #7
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Is there any easy fix or anything? Any ideas? How are they originally fitted ?
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Old 11-09-2011, 01:10 PM   #8
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I used an exhaust u-clamp to clam the "nose" of the shield firmly down, haven't had any rattles since (30k + of "spirited" driving through mostly bump roads on rubber band tires).
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Old 11-09-2011, 04:22 PM   #9
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just rip it off...
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Old 11-09-2011, 04:39 PM   #10
limenuke
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Quote:
Originally Posted by Axxe View Post
I used an exhaust u-clamp to clam the "nose" of the shield firmly down, haven't had any rattles since (30k + of "spirited" driving through mostly bump roads on rubber band tires).

One of those bad boys?
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Old 11-10-2011, 12:00 PM   #11
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One of those bad boys?
Yup. Cant remember the size though.
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Old 11-10-2011, 01:35 PM   #12
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i usually re-weld them on if they arent too rotted
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Old 11-10-2011, 02:08 PM   #13
limenuke
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By heat shield, you do mean the things actually attached to the piping right? Not the piece in this picture:


I'm referring to actually circular pieces of metal rattling around the exhaust/cat piping.
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Old 11-10-2011, 02:44 PM   #14
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Could it be the item circled. I've seen that bolt come loose, and the two pieces rattle at different RPM's/Engine Load.
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Old 11-10-2011, 03:52 PM   #15
limenuke
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Could it be the item circled. I've seen that bolt come loose, and the two pieces rattle at different RPM's/Engine Load.
I believe its the pieces between the label 1 and label 16 - the two ribbed circular pieces on the main tube. They are loose.
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