Exhaust Rattle

limenuke · 11-08-2011, 06:43 PM

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?

pawcio · 11-08-2011, 07:38 PM

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.

limenuke · 11-08-2011, 08:44 PM

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.

pawcio · 11-08-2011, 09:56 PM

^ are they the actual pieces that are rattling against each other? or is there something loose that may be rattling against them?

limenuke · 11-08-2011, 10:18 PM

The actual pieces. They are loose on the tubes.

doogee · 11-09-2011, 02:34 AM

Those are the shields on the cats.

limenuke · 11-09-2011, 11:41 AM

Is there any easy fix or anything? Any ideas? How are they originally fitted ?

Axxe · 11-09-2011, 12:10 PM

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).

SiR · 11-09-2011, 03:22 PM

just rip it off...

limenuke · 11-09-2011, 03:39 PM

Quote:

Originally Posted by Axxe

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?

Axxe · 11-10-2011, 11:00 AM

Quote:

Originally Posted by limenuke

One of those bad boys?

Yup. Cant remember the size though.

yellowfever3 · 11-10-2011, 12:35 PM

i usually re-weld them on if they arent too rotted

limenuke · 11-10-2011, 01:08 PM

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.

MrRWD · 11-10-2011, 01:44 PM

Could it be the item circled. I've seen that bolt come loose, and the two pieces rattle at different RPM's/Engine Load.

limenuke · 11-10-2011, 02:52 PM

Quote:

Originally Posted by MrRWD

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.