Installing Cavity Sealing (Not Expanded) Rep-Rep-RAGRP41-4107102 - V.4 (M4 2021-2023)
WARNING: This page is about a different car, the 2025 BMW M4, 2024 BMW M4, 2023 BMW M4, 2022 BMW M4, and 2021 BMW M4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Carry over schematic diagram to the relevant vehicle type.
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.
WARNING:
Ensure adequate ventilation over entire processing period.