Installing Cavity Sealing (Not Expanded) (M3 Base, M3 Competition, M3 Competition M xDrive, M3 CS)

The following repair represents replacement of a cavity acoustic baffle

Before these work steps, prepare the new part so that it is ready to install (adapting, cutting to size, applying welding primer etc.)

Sand contact surface of cavity acoustic baffle (1) with coarse-grained sandpaper (grain 50-100)

Clean contact surface (1) with cleaning agent R2

Apply a bead approx. 15 mm high of SEALANT D2  to contact surface (1)

If necessary apply sealant D2 somewhat thinner on each side, to prevent the sealant from running

Attach cavity acoustic baffle in specified position (see old part)

Fit, secure and weld up new part

Courtesy of BMW OF NORTH AMERICA, INC.