More fun things. I've had a rattle/creak in the body just above my head for a couple of years now. It shows up when the body flexes and has been steadily getting worse.
When we had the BBQ this weekend a few folks were willing to help me pull the headliner to investigate (thanks, guys!)
The main thing I discovered is that the foremost rib (the one that the dome light mounts to) was no longer attached to the roof.
See how the adhesive is all let go on this one but intact on the others?
Tiger Seal body sealer to the rescue! This is a 1k polyurethane product designed just for stuff like this.
I did my best to clean the existing dried sealant out then squirted about a 1/3 of the tube into the middle of the rib. I also put a little into the corner where it meets the body because it always sounded like the noise was coming from there. Prop the rib up to the roof with some scrap lumber.
While it cured I went to work prepping the roof for sound deadening. Boy, the fabric adhesive or whatever is really stubborn stuff. After pulling out the old felt I sprayed the leftover glue with rubbing alcohol and scraped it off with a razor blade. Scraping the whole roof, upside down, was a startling amount of labor.
First goes the
Siless 80mil butyl mat. This damps out the vibrations of the sheet metal and adds some thermal insulation. I used a little roller and tried to squish it down as best I could. Also quite a workout!
Next up is the
Siless 157mil acoustic mat. This absorbs the airborne sound inside the vehicle and also provides some thermal insulation. Much easier to apply.
I used about 2/3 of the package for both products, so about 25sqft. I have some extra so I'll have to figure out what to do with it now :bowl:
All done!
After giving the sealant 24hr or so I removed the support stick and the rib is very firmly bonded onto the roof. Yay!
Timmy helped me get my headliner back in before heading back to the West Coast.
I haven't spent any time driving the 4Runner yet but I can tell there's a difference already. Just sitting inside talking you can tell the acoustics are much more "flat".