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Help with new heatproof(?) foam under E350 OM642 engine cover

MrGreedy

MB Enthusiast
Joined
Jan 13, 2020
Messages
2,575
Location
Here and there
Car
E350 CDI
Hi guys and girls,

When doing some work on the E350 CDI today, I took the plastic engine cover off to start the work and was greated with a surprise of what looked like dirt or soil all over the top of the batwing/air filters.
It wasn't until I was giving the engine cover a bit of a spruce up did I realise this 'dirt' was actually some brown heatproof(?) foam rapidly disintegrating from the underside of the engine cover. A very gentle rub with a finger and it's just falling apart.
It's the two coffee-brown rectangle bits in the image below.

Screenshot_20241103_202132_Gallery.jpg

Does anyone know if I can try to peel off this brown foam and replace? It's stuck well to the dirty grey fabric/carpet type material that can be seen more prominently along the top of the cover as shown in the picture.
If it comes as new insulation bonded to the carpet thing, the carpet thing is attached to the underside of the engine cover by spot melts/plastic welds.

Alternatively, can anyone suggest a DIY fix? If I scrape off the brown foam as best I can, what can I use instead please and how might I stick it down?

I had a look through the forum, but couldn't find anything similar.
Am I alone with this issue?
 
Hi guys and girls,

When doing some work on the E350 CDI today, I took the plastic engine cover off to start the work and was greated with a surprise of what looked like dirt or soil all over the top of the batwing/air filters.
It wasn't until I was giving the engine cover a bit of a spruce up did I realise this 'dirt' was actually some brown heatproof(?) foam rapidly disintegrating from the underside of the engine cover. A very gentle rub with a finger and it's just falling apart.
It's the two coffee-brown rectangle bits in the image below.

View attachment 163532

Does anyone know if I can try to peel off this brown foam and replace? It's stuck well to the dirty grey fabric/carpet type material that can be seen more prominently along the top of the cover as shown in the picture.
If it comes as new insulation bonded to the carpet thing, the carpet thing is attached to the underside of the engine cover by spot melts/plastic welds.

Alternatively, can anyone suggest a DIY fix? If I scrape off the brown foam as best I can, what can I use instead please and how might I stick it down?

I had a look through the forum, but couldn't find anything similar.
Am I alone with this issue?


Happened on my w211 , some kind of anti vibration pads. I suppose some thin polystyrene sheet or similar foam pad, glued on would work. Depending on how hot it gets under there.
 
Part No. A6420104267 for the whole new cover.
Nothing new showing for a websearch.

I fancy a laugh so I'll get in touch with Merc and see how many hundreds of pounds this is.
 
Part No. A6420104267 for the whole new cover.
Nothing new showing for a websearch.

I fancy a laugh so I'll get in touch with Merc and see how many hundreds of pounds this is.
Ebay £70 . Worse than yours. 😄

Screenshot_20241104-041649.png
 
Jet wash or rub off the old stuff and then refit the cover and see if you actually need to replace anything?
 
Jet wash or rub off the old stuff and then refit the cover and see if you actually need to replace anything?
Probably not buddy . 👍
 

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