BMW 7 Series: Bonding Steel On Steel

IMPORTANT: Conform with safety regulations.

Overview of topics

1. Equipment
2. Preparing the surface
3. Bonding coat
4. Hardening times
5. Subsequent treatment

1.0 Equipment

• Sandpaper
• CLEANING AGENT R1
• ADHESIVE K1
• CARTRIDGE GUN

2.0 Surface preparation

• For better adhesion, remove oxide film and paint from the adhesive areas with a stainless steel wire brush or special sandpaper.
• Clean bonding surfaces with cleaning agent R1.
• Allow cleaned surfaces to dry for approx. 5 minutes.

  Bonding surfaces must be completely dry.

3.0 Adhesive application

• Processing temperature of glue cartridge 18ºC - 30ºC.
• Object temperature, vehicle and new parts, min. 15ºC.
• After applying the adhesive, check whether an adhesive component has emerged at the back of the glue cartridge. If yes, break off the bonding procedure. Clean new part. Use new glue cartridge. Contact national hotline.
• Join components and secure in position.
• Remove excess adhesive. Do not use solvent cleaning agents.

4.0 Hardening times

• Refer to NOTES REGARDING ADHESIVE K1

5.0 Subsequent treatment of bonding surfaces

• Protect the repair area with cavity sealant.

CARRYING OVER HOLE PATTERN

When replacing a body component, it is necessary to carry over the hole pattern from the existing body to the new component.

The following pictures are a schematic representation of carrying over the hole pattern on the example of the front wheel arch.

Necessary preliminary tasks

Adjust new part to fit with straightening attachment.

Insert paper stencil (1) between new component (2) and engine carrier and secure with adhesive tape (3).

Carry over contour (4) of new component to stencil.

Remove new component.

Fig. 1: Securing Paper Stencil Using Adhesive Tape

(1) = contour of new component.

Carry over positions of holes (2) to stencil by pressing down with thumbs.

Remove stencil.

Fig. 2: Carrying Over Positions Of Holes To Stencil

Fig. 3: Identifying Holes With Crosses And Stencil

Lay stencil (1) on a flat surface.

Mark center points of holes with crosses (2).

Then pierce paper through center points (3) of holes with a pointed object.

Align stencil (1) according to contours (2) to inside of new component and secure with adhesive tape (3).

Fig. 4: Securing Stencil To Component Using Adhesive Tape

Turn over new component.

IMPORTANT: Crosses must not be visible in this view!

Set punch marks at pierced center points (1).

Grip directly under punch marks for marking with punch.

Remove stencil (2).

Drill holes to approx. 3 - 4 mm dia. at punch marks (1).

Fig. 5: Identifying Stencil And Punch Marks

Position new component (1) with straightening attachment on vehicle.

Drill out holes (2) to 6.7 mm dia.

Fig. 6: Identifying Component Position And Drill Holes

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