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General E46 Forum
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Old 03-26-2009, 02:06 AM   #1
KDS
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Drooping Hood Insulation

The under-hood insulation panel on my '05 sedan has started to drop down. There's a total of six tabs that are supposed to fit into slots in the hood, but none of them are staying put. Only the expanding rivets are holding the whole thing in place.

Is this typical? Seems like a really ghetto detail on an otherwise very nicely put-together car.
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Old 03-26-2009, 03:06 AM   #2
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Any pics of the sagging?
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Old 03-26-2009, 03:07 AM   #3
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you can just take it off, plenty of people do
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Old 03-26-2009, 04:08 AM   #4
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you can just take it off, plenty of people do
+1

It's just sound deadening. If you take it off I don't think you would be able to tell the difference.

And tons of people will go on about it causing the paint on the hood to peel but they are just making that up. I have had this piece removed on my car for years, paint is perfect. Not to mention E46 engines run pretty cool, and that's why things like the valve cover and intake is plastic.
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Old 03-26-2009, 04:11 AM   #5
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sounds like the tabs are worn out or broken a bit. Either get a new insulator from the dealer or take it out completely. You could also go ghetto and shove something in there with the tabs to keep them in tight, but I would not recommend that.
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Old 03-26-2009, 07:21 AM   #6
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What happens over time is heat causes the insulator to shrink slightly and become brittle, the two rear tabs on mine don't reach the slots anymore.
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Old 03-26-2009, 07:35 AM   #7
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You're absolutly right Darkoz. A lot of times you don't notice on other cars because they have more of those plastic screw types holding the insulation instead of slide-in tabs.
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Old 03-26-2009, 09:45 AM   #8
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What happens over time is heat causes the insulator to shrink slightly and become brittle, the two rear tabs on mine don't reach the slots anymore.
+1 True,true
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Old 03-26-2009, 09:46 AM   #9
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remove it, it does nothing
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Old 03-26-2009, 09:54 AM   #10
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Is this typical? Seems like a really ghetto detail on an otherwise very nicely put-together car.
It is not ghetto. The insulation is held in place by tabs so that it can drop down in case of an engine fire. The heat melts the tabs and the blanket puts out the fire.
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Old 03-26-2009, 11:41 AM   #11
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The heat melts the tabs and the blanket puts out the fire.
For real? That's kinda cool...
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Old 03-26-2009, 12:47 PM   #12
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It is not ghetto. The insulation is held in place by tabs so that it can drop down in case of an engine fire. The heat melts the tabs and the blanket puts out the fire.
thats a myth...as people already said, its just for sound deadening
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Old 03-26-2009, 01:09 PM   #13
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It's normal. Over time, the insulation/sound-proofing shrinks from heat. Just get a replacement if you need it looking better. A new piece might even improve noise refinement. Without it the hood might get a bit too hot and there is risk of skin burning on contact.

Last edited by GoingNuts; 03-26-2009 at 01:19 PM.
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Old 12-11-2011, 06:39 PM   #14
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My solution: zip ties (you can spot 4, 2 on the sides and 2 on the bottom)



No word yet on whether the zip ties will melt, but I figure the plastic snaps that are keeping the middle in haven't melted yet, so the zip ties should survive.
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Old 12-11-2011, 09:52 PM   #15
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Mine is removed; it wasnt sagging, it was in great shape, but I just wanted my engine bay to cool off easier.
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Old 04-14-2012, 04:55 PM   #16
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My solution: zip ties (you can spot 4, 2 on the sides and 2 on the bottom)



No word yet on whether the zip ties will melt, but I figure the plastic snaps that are keeping the middle in haven't melted yet, so the zip ties should survive.
Thanks for this idea. I had one of the tabs that lost its stiffness. This idea worked perfectly.

Thanks again
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Old 04-14-2012, 05:16 PM   #17
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did you get it wet?
mine is petty good after 11 years.
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Old 04-14-2012, 06:11 PM   #18
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Stick it back up by using high temperature double sticky sided tape strips; and thats not duct tape either !
or just find the BMW hood insulation part with new grommet set online ... try Pelican parts or others
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Last edited by Roby G; 04-14-2012 at 06:11 PM. Reason: spelling
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Old 04-14-2012, 07:52 PM   #19
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Mine is still off.
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Old 01-24-2014, 05:42 AM   #20
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I really like this idea. Can someone tell me how you attached the wire tie to the hood? Did you have to drill holes to attach the tie to the hood?
Thanks for the clarification.
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