Missing Injected Foam Insulation from Factory - Jeep Garage - Jeep Forum

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  #1  
Old 07-03-2015, 09:26 PM
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Missing Injected Foam Insulation from Factory

Went to install the Mopar side rails this afternoon on my Jan2015 build overland, studied the instructions for a bit before I starter and kept noticing this step that required chipping away at something and removing, couldn't really figure it out but went ahead and started the install.

Progressed through the install on both sides and on the last bracket I pull off the rubber grommet (there are 6 on each side of the car) that covers the holes where the attachment point goes and notice there is injected foam that needs to be chipped away to make room for the attachment post as the instructions call for. But none of the other points on the car had this, just this one single area driver side rear - weird.

Do some research and it looks like Jeep injects some acoustic foam to cut down on noise in specific cavities within the structure, however, I AM MISSING all but one small area of this foam, it doesn't appear in the other spots it should.

Anyone else have this problem? Or has anyone else installed the mopar side rails and noticed the foam?

Here is a link detailing the exact spots it should be (this is a Cherokee but I have read articles that the Grand Cherokee uses this foam as well so assuming similar spots are treated and this was the only good visual I could find on it):


Always thought my car was a tad bit louder than the others I test drove, but attributed that to the 20" wheels over the 18" when I was testing limiteds vs overlands.

Attached pictures of the area I am talking about as well as the instruction step that details the removal of some of the foam to make way for the attachment.
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File Type: jpg IMG_2139 (1).jpg (34.1 KB, 68 views)
File Type: jpg IMG_2144.jpg (36.4 KB, 78 views)

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  #2  
Old 07-04-2015, 12:24 AM
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Re: Missing Injected Foam Insulation from Factory

The line stops and will not move if the foam is not injected.

The foam is injected in somewhat of a liquid state and solidifies within seconds. It's gotta be in there...somewhere. Do this to make sure: There's round black rubber grommets on the side of the Jeep. They are about an inch in diameter. You'll see them when you open the door. Remove the grommets, there should be foam behind them.
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Old 07-04-2015, 01:03 AM
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Re: Missing Injected Foam Insulation from Factory

Unless it was believed that foam was injected. Someone being sneaky to keep the line movn'.........


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  #4  
Old 07-04-2015, 10:11 AM
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Re: Missing Injected Foam Insulation from Factory

Funny you mention that.

My 3/26/2015 build does not have it either and I am damn glad in that area of the rockers it doesn't.

I pulled all those plugs out and shot about 2 cans of fluid film to prevent rust. in the rockers

WHile that foam crap may be great for sound deadening, if one goes to a junk yard and looks at the older WJ and WK's showing up, guess where all the rot is, you got it right where they flooded the wheel arches, rockers etc with that crap.

They shouldn't use it anywhere on the lower portions of the body, too much moisute gets trapped from it and the panels will rot from the inside out.
Fluid FilmĀ® | Corrosion Preventative, Lubricant and Rust Inhibitor
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Old 07-06-2015, 09:54 AM
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Re: Missing Injected Foam Insulation from Factory

Here is why you dont want that foam crap in your rockers, this is what you get when you bittchh to OEM about NVH, sound deadening which leads to iron worms.
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