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From: Dale Beuning
Date: Wed, 31 Dec 2003
Subject: E34 Sunroof Rattles

On my '95 525iT I was starting to get more and more rattles from the sunroof. It seemed that adding Dynamat to the lower interior panel portion of the sunroof would reduce the rattles, so I decided to give that a try. This procedure may work on E36 and E39 cars as well, I don't have one to try it out on, so I don't know.

Materials needed:

The sunroof needs to be in the proper position to apply the Dynamat, I have the special Touring-only double sunroof, so I just slid the front portion all the way back. This allowed access to the front portion of the lower panel. Warning! be very careful you don't apply the Dynamat in such a way that it will interfere with proper operation of the sunroof mechanism.

  • Cut 2 of the 12x12 pieces into 7"x12" pieces, leaving 2 5"x12" pieces.
  • Clean the surface with your cleaning agent, leaving a dry dust and grease-free surface.
  • Apply a 7"x12" piece to the left side of the lower panel, it should cover about 1/2 of the available area. Repeat on the right side.
  • Only peel back a corner of the backing plastic before placing the Dynamat on the panel, get that stuck down, then remove the rest of the plastic backing.

  • For extra damping, I applied the leftover 5"x12" pieces on top of the 7"x12" pieces for double thickness.
  • I had an extra piece from a previous project, so I put that on top in the middle for a 3rd layer.

Take the car for a test drive and you should notice a big reduction in noise from the sunroof.

Dynamat Original should be cut to the desired size and shape before the backing paper is removed. It may be cut with scissors, knife, or die. Remove dust, grease, moisture, and other foreign matter from the application surface. Peel off the backing paper. The simplest application technique is to bend the pad slightly and attach it along its shortest edge. The pad is then pressed firmly into place, preferably with a roller for larger pieces. This reduces the risk of leaving air pockets, which reduce the sound damping capacity. The temperature of the pad and application surface should not be below room temperature during fitting. Heating the material before applying is strongly recommend, and increases flexibility, strechability, and adhesion.

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