Replace B-Pillar With Reinforcement, Left (Rear Side Panel Removed) (M4 Convertible)

Observe procedure for REPAIR STAGE 3 .

Read contents of BODY, GENERAL .

Spot-weld bonding is used on this vehicle. Observe specific PROCEDURE .

Use only approved spot-welding apparatus for repair.

For stripping and rebuilding operations, see the surrounding texts on KSD CD (FRU number 41 21 670).

Place vehicle on straightening bench.

Following new body parts are required (see applicable BMW Parts Catalog):

Following CONSUMABLES are required:

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Removal

Open welded connections in areas (1).

LOOSEN spot-welded adhesive joint in area (2) and remove reinforcement of B-pillar.

In connection face of outer sill: Remove rest of sealant on radiator tank.

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New part preparation

Mark severance cut (1) as pictured and cut.

Dimension a = approx. 20 mm.

Prepare MAG weld (metal active gas) in separating cut area. Length of weld seams approx. 15 mm. Distance 20 mm.

Adjust the new part with an alignment bracket or universal fixture and in conjunction with the side panel.

NOTE: When adjusting the new part, the side panel thickness must be taken into consideration depending on straightening system manufacturer.

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Rear wheel arch area:

Drill 4 bore holes (2) and (3) of diameter 4.2 mm in area (1) for blind rivet.

NOTE: Pay attention to the panel behind the bore holes when positioning them!

Attachment in this area (1) is effected using adhesive riveting technology.

In the remaining joining areas, prepare new part for joining by welding.

Attention!

Structure bonding!

OBSERVE preparation of bonding surfaces.

Installation

Clean bonding surfaces on vehicle and on new part with cleaning agent R1.

Apply adhesive K1 to bonding surface (1).

Install new part with alignment bracket or universal fixture and secure using gripping pliers.

NOTE: The installation of the new part must take the side panel thickness into consideration depending on the alignment system manufacturer.

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Install 3 x blind rivet N6 (2) and 1 x blind rivet N3 (3) in area (1).

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Weld new part in areas (1) analogous to series in accordance with new part preparation.

NOTE: Risk of damage for radiator tank. Avoid excessive application of heat.

After completing welding work: Apply sealant in radiator tank area and B-pillar reinforcement.

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