Rattle in Passenger Door - Mercedes-Benz Forum
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post #1 of 15 (permalink) Old 10-02-2017, 04:26 AM Thread Starter
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Rattle in Passenger Door

I have had this 2006 CLK for about two months and since the weather is warm I have had the top down on most of my travels and have been amazed at how quiet the vehicle is when going over bumps and even RR tracks. But this weekend it was cooler so raised the top and windows and discovered I have a annoying rattle in the right door, and a slightly less annoying rattle in the left door. Before I diagnose this issue, I thought I would seek the combined wisdom of this forum for their thoughts.
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post #2 of 15 (permalink) Old 10-02-2017, 04:08 PM
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I remember reading here somewhere once that an owner found a loose bolt inside the door which had been rattling.There are two which are accessed via rubber grommets along the door's lower horizontal edge.
You could try checking yours.

Last edited by Benzyle; 10-02-2017 at 10:04 PM.
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post #3 of 15 (permalink) Old 10-02-2017, 04:52 PM Thread Starter
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Originally Posted by Benzyle View Post
I remember reading here somewhere once that an owner found a loose bolt inside the door which had been rattling.
It was accessed via a rubber grommet about half way along the door's lower horizontal edge.
You could try checking yours.
Thanks, I'll check that out. But wonder why the bolt is not rattling when the window is down. Could be the window has trapped the bolt. Then again if there is a bolt loose in there, what is not being bolted??
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post #4 of 15 (permalink) Old 10-02-2017, 05:26 PM
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Good questions...could be the weight of the glass stops the rattle,,,I don't remember what the bolt was for,,,probably something to do with the glass/regulator?
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post #5 of 15 (permalink) Old 10-02-2017, 05:34 PM Thread Starter
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Good questions...could be the weight of the glass stops the rattle,,,I don't remember what the bolt was for,,,probably something to do with the glass/regulator?
Found the source of the rattle. The door regulators have a stud that fits in a bracket at the bottom of the door. You only need to remove a rubber plug on the bottom edge of the door to access the nut holding the regulator in place. On the right side the nut was loose and it was tightened. On the left side the nut was missing so a replacement nut and washer went on that one and tightened. No more rattle and I did not even have to remove the door panels! Sometimes German engineering is awesome.
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post #6 of 15 (permalink) Old 10-02-2017, 06:41 PM
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Great news ! We had a win.
So it was a loose nut,not a bolt. Thanks for the photo,,maybe we should all check ours to make sure they are not getting loose.
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post #7 of 15 (permalink) Old 10-02-2017, 06:48 PM Thread Starter
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Great news ! We had a win.
So it was a loose nut,not a bolt. Thanks for the photo,,maybe we should all check ours to make sure they are not getting loose.
Before I tightened the nuts I got my bottle of Loctite and it was empty, so when I replace the Loctite I'll back off the nuts and apply a little to each one. They will never get loose again! Wish every repair was so simple.
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post #8 of 15 (permalink) Old 10-02-2017, 07:37 PM
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Note that those nuts are used to adjust the glass:

http://benzbits.com/w209/SideWindowP...Adjustment.pdf

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post #9 of 15 (permalink) Old 10-02-2017, 08:32 PM Thread Starter
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Note that those nuts are used to adjust the glass:

http://benzbits.com/w209/SideWindowP...Adjustment.pdf
I realized that by the fact that there was a slot to adjust the window. Before I tightened them I checked the window alignment with the rear window and the top. But thanks for the illustration. You are cool.
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post #10 of 15 (permalink) Old 10-02-2017, 10:10 PM
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I just checked my nuts and found they were indeed a little bit loose.
I managed to fix them without any help from my wife.
I used a 10mm socket and a two inch extension,torqued to 12Nm,(thanks to Rodney for the WIS).
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