Rattle me this - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 08-01-2013, 08:34 PM Thread Starter
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Date registered: Aug 2008
Vehicle: 1971 250C
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Rattle me this

As i like my cars quiet i was in pursuit to make my W114 quieter.
Double and triple sound deadening and insulation all around, floor, sides, door, roof.
all the seats filled with sound absorbing material, specially the back.
hood for sound reduction and trunk for sound reduction.

Guess what?

I took the car for a ride today just when i thought it is all quiet and the rattle like sound is still coming from the back area, behind the sunroof.

just when i was about to set the car on fire or break something by mistake i touched the rear window.

The freaking rattle comes from the rear window, the whole window is shaking.
i push on it to sit tight and no rattle.

What a crazy thing, i have never heard of this before, still very upset but happy to have found the source of my frustration.
The rattle happens on minor bumps not on big holes or uneven surfaces.


my question is:
Can i remove the outside chrome trim to see if i can put silicon or something?

the rubber looks like new, my car has no sign of wear on any rubber anywhere thus the reason for me not looking there at all.

is this a normal thing?
Any suggestions how to fix it?

Thank you.
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post #2 of 10 (permalink) Old 08-02-2013, 08:43 AM
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Vehicle: 1981 240D W123; 1975 240D W115 (Sold)
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If the rubber seal appears new and the window is shaking, then I would assume the seal was improperly fitted by the previous owner. However, there is something else to consider. There could be a small area of rust damage or previously repaired body work in the window frame creating an imperfect seal. I have never replaced front and rear window seals on a Mercedes because I am afraid of cracking or damaging the glass. Door seals and side window seals are different, however. I would find a competent glass auto body shop and have them examine what you have found. It may be something a minor adjustment may remedy.
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post #3 of 10 (permalink) Old 08-02-2013, 09:24 AM Thread Starter
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I removed the trim and the rubber feels solid and like new
No signs of removal or repair anywhere
Nor rust
From outside there is no movement
The movement is from inside and by adding few wedges it is quiet but not sure how to really fix it

Rattle me this-imageuploadedbyag-free1375457090.520554.jpg


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post #4 of 10 (permalink) Old 08-02-2013, 09:34 AM
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Now looking at the pictures of your rear glass, it is totally different than my 72 250. It looks like your trim just clips on making it much easier to remove and reinstall. My 250 is much more difficult to get the chrome trim back into the slit on the rubber seal.

To make it easy, how about some black silicone holding in some rubber wedges that will not be visible?
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post #5 of 10 (permalink) Old 08-02-2013, 03:18 PM
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That's great news. At least there is no sign of rust or body damage. Perhaps, the rubber seal is slightly warped and not holding the trim exactly in place. Subsequently, you have the slight rattle. I would use your rubber wedge method with some silicone that Luna Gaudi's 72 250 mentioned. In the past, I have found that being creative with trim pieces can be an easy solution to some of the quirks. A couple of my exterior trim pieces have been taken care of in this fashion.
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post #6 of 10 (permalink) Old 08-02-2013, 04:25 PM Thread Starter
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Any specific silicone?
A friend of my from the Netherlands recommended Sikaflex 221 but I don't think it is available here.
Thank you


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post #7 of 10 (permalink) Old 08-02-2013, 05:11 PM
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I'd forget the wedge idea. From the pictures I can tell you have a heated glass. The strips that connect to the glass sometimes come loose and can create a noise. The rear glass is tempered, not laminated so removing it is simple, just cut all the rubber seal holding it in from the outside with a utility knife, unscrew the two wires for the heated glass and remove it. The factory installed a dumb-dumb putty when they installed the glass and it hardens and allows movement/noise. Clean all that out, get a new seal ($100 or so from any number of vendors) wrap it around the glass, you will have to drill two small holes in obvious places to allow the wires for the heated glass through and pull in the window. Pulling in a window with a rubber seal is simple: It's probably on Youtube, but all you need is a strand of wire which you insert in the gasket, all the way around with a loop in the middle of the top and bottom. Coat the seal and the opening liberally with a coat of GOJO hand cleaner (no pumice). Lay the glass over the opening, make sure it's even left to right. Have someone apply light pressure from the outside and start pulling on the wire, first at the bottom middle until 80% of the bottom is in then at the top, working both sides evenly. Then finish around the corners. Smack the glass in the corners to make sure the glass and the seal are right. At the top it is important to make sure the headliner is glued in well before you start since the seal hold it in place. If it all sounds like too much, call the glass guy and pay him $100 for the install.
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post #8 of 10 (permalink) Old 08-02-2013, 06:58 PM
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If you do choose to do the silicone route, this is what I would recommend. I have used this in many applications over the years and it works supurbly! In fact, I always keep a brand new unopend package in the garage at all times!
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post #9 of 10 (permalink) Old 08-02-2013, 07:16 PM Thread Starter
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Armstar,
Fantastic information
It does make sense what you are saying as the rubber is almost like new so it must be the putty

I put some wedges for now yo test my theory and drive the car
For the first time the car is silent I just can't believe how much noise was coming out of there
I guess the whole window shook and amplified through the chassis of the car

I will leave it as is for now until I find rubber and time to do it, I might even pay someone as this scares me a lot
What place do you recommend to order the rubber gasket from?

Luna, thank you for that info, I will buy it

I am so relieved that I finally found the source of the noise. I hope it helps someone with similar issue.
It's a first one for me.

Thank you all.


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post #10 of 10 (permalink) Old 08-03-2013, 02:50 PM
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Pelican parts should have it, or just search on line. Europarts makes a good replacement, oe will be much more.
Take care.
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