Preserving the front door

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The inner door panel is welded with the door outer skin in the area (1) .
The weld seam must be protected against corrosion by cavity preservation.

Courtesy of BMW OF NORTH AMERICA, INC.
Preserve the inner door panel in the area of the weld seam (1) .
Remove any cavity preservation which emerges.

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: To provide a better overview: Shown without door outer skin.
Preserve weld seams (1) between the reinforcements and the inner door panel.

Courtesy of BMW OF NORTH AMERICA, INC.