Under Bonnet Sound Proofing

Post Sun Dec 03, 2017 9:42 pm

Hi members, anybody replaced the under Bonnet felt on their E30? Have removed all the old felt and have bought the proper stuff from BMW. However whilst the new felt has a tacky backing not sure if I need some more glue on the metal panel and if so which one. Anybody done this and very grateful for your help. Thanks guys and girls.

Post Mon Dec 04, 2017 8:23 am

I have just replaced mine a couple of weeks ago. You don’t need any extra glue as the bmw one is quite strong. Just make sure you get it right in the first place as once stuck it won’t shift. I just made sure that the under bonnet was really clean by taking off the old foam and glue.

The BMW dealer advised me to use tar remover to take off old glue but I found the best way was to brush liberally white spirit on the residue and leave it for a while and then use a plastic spatula to scrape off and when it is nearly clean use panel wipe or methylated spirit to clean it off. I would also recommend that you put some large cardboard on top of the engine to stop any residue falling on the engine as the old stuff when it falls off and dries out will stick firmly.

Post Mon Dec 04, 2017 7:49 pm

That is really helpful and much appreciated. I have taken most if not all of the old stuff off with a copious dose of plastic spatula and some Halfords glue remover but will do as you say as a belt and braces. Thanks again. Good to know that the BM stuff does what it is supposed to do.

Post Mon Dec 04, 2017 8:31 pm

I think BSS325i recommended some brake cleaner from Toyota or something like that.

Post Tue Dec 05, 2017 8:08 am

Satan wrote:I think BSS325i recommended some brake cleaner from Toyota or something like that.

I found brake cleaner not much good as it was hard going plus working inside the garage I found the fumes were making me feel a bit rough.

Post Tue Dec 05, 2017 3:21 pm

30316 wrote:
Satan wrote:I think BSS325i recommended some brake cleaner from Toyota or something like that.
I found brake cleaner not much good as it was hard going plus working inside the garage I found the fumes were making me feel a bit rough.

Post Sun Dec 10, 2017 12:22 pm

Soak a rag with petrol and that removes it but wear gloves and follow the safety of good ventilation outside preferably when you do this

peter

Post Sun Dec 10, 2017 1:27 pm

By the way, how much was this and was it a main stealer part?

Cheers Mart.

Post Sun Dec 10, 2017 2:46 pm

I've said it before and I'll say it again, it's not necessary to remove all the old adhesive, just remove the old crumbling foam and stick the new on top.

Post Sun Dec 10, 2017 5:04 pm

As far as I know you can only get one from the main dealer. I think it was about £35

Post Mon Dec 11, 2017 9:34 am

I think its closer to £50, reminds me that I need to fit mine as its been sat in the loft for 3 years.

http://www.realoem.com/bmw/enUS/showpar ... Id=51_2140

Post Mon Dec 11, 2017 11:06 pm

Satan wrote:I think its closer to £50, reminds me that I need to fit mine as its been sat in the loft for 3 years.

http://www.realoem.com/bmw/enUS/showpar ... Id=51_2140

I just checked the receipt I paid £37.31 including vat about a month ago

Post Tue Dec 12, 2017 8:59 am

Wow gone down in price.

Post Sun Dec 24, 2017 11:12 am

Thats not bad is it! Best order some myself!

Post Mon Jan 08, 2018 12:22 am

yea I got mine for £37 about 5 months ago. the old glue took me hours as I ended taking the bonnet off and cleaning it with sticky stuff remover kind of stuff.

Post Mon Jan 08, 2018 3:58 pm

Use white spirit, the old glue just falls off.