[knightvd]

I removed my plastic underside cover on my 2011 328i and this dome shaped rubber bushing or grommet fell out. Does anyone know what it is?
https://www.dropbox.com/s/fiw1e9r8mz..._1523.JPG?dl=0

https://www.dropbox.com/s/g7vvdeuzvs..._1524.JPG?dl=0

https://www.dropbox.com/s/hy90vbv7ez..._1525.JPG?dl=0







I have a slight rattle on start up and think this might be related. (I just replaced the engine mounts so I eliminated those as the cause)

[CTinline-six]

That is a grommet that goes under the air filter box.

[Efthreeoh]

This has been asked several times. It's the bushing at the bottom of the air box. It sits in serrated stud in the framerail and the round side fits in a recess in the bottom of the air box. Pull the air box and turn it over and you'll understand. When the box is removed the rubber bushing sticks to the air box then falls out and sits on the belly pan until someone removes the pan.

[knightvd]

Thank you. I did attempt to search the forums but “rubber bushing” “grommet” did not get any related hits.

[Efthreeoh]

Originally Posted by knightvd

Thank you. I did attempt to search the forums but “rubber bushing” “grommet” did not get any related hits.

Yeah, it's a hard topic to search on and find the answer. But your phrashing is almost identical to the other times the question is asked. It's just funny that the question is almost identical every time someone asks it.

Perhaps the Mods should make this thread a sticky called "Mysterious Rubber Bushing Found"...

[CTinline-six]

I've actually dropped that stupid thing in the tray about 50 times on the 325. I think it is a little worn and doesn't stay on the frame rail like it does on the 328. I'll pick up the airbox then hear some thing drop onto the plastic under tray.

[tlow98]

Originally Posted by CTinline-six

I've actually dropped that stupid thing in the tray about 50 times on the 325. I think it is a little worn and doesn't stay on the frame rail like it does on the 328. I'll pick up the airbox then hear some thing drop onto the plastic under tray.

I put a dab of silicone sealer on mine. Holds it in place well

[CTinline-six]

Originally Posted by tlow98

I put a dab of silicone sealer on mine. Holds it in place well

Yeah I'll do that next time it is apart.

[maxwell1331]

Originally Posted by tlow98

I put a dab of silicone sealer on mine. Holds it in place well

Ditto

[S65Hunter]

Will the Airbox be ok without it? I ran into this the other day when flushing my power steering. I removed the underbelly and that little guy fell down with it. I didn't know what it was so I set it to the side.