Replacing A-Pillar With Reinforcement On Left (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 repairs; See WORKSHOP EQUIPMENT (BMW AND MINI VEHICLES) .

For stripping and rebuilding operations, refer to surrounding texts on KSD (flat rate unit number 41 21 003).

Place vehicle on straightening bench.

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

(1) Side frame, outer

Following CONSUMABLES are required:

Courtesy of BMW OF NORTH AMERICA, INC.

Material	Quantity
Adhesive K1	1
Blind rivet N8	1
Blind rivet N9	1
Cleaning agent R1	1
Sealant D1
Cavity sealing wax remover

Removal

Courtesy of BMW OF NORTH AMERICA, INC.

Open welded connections in areas (1).

LOOSEN spot-welded adhesive joints in areas (2).

Open brazed joint in area (3).

(4) = Position of cavity sealing.

Courtesy of BMW OF NORTH AMERICA, INC.

Open welded connections in areas (1).

View of A-pillar vehicle interior.

Loosen metal-active-gas welded connection in area (1). Remove A-pillar.

Courtesy of BMW OF NORTH AMERICA, INC.

New part preparation

Courtesy of BMW OF NORTH AMERICA, INC.

View of new part inside:

Open welded connections in areas (1) and (2).

Loosen corresponding welded connections on outer side and loosen A-pillar from outer sill.

Adjust new part to fit with alignment bracket or universal mount and secure.

NOTE: Loosen the welded connection in area (2) from the sill side.

The welded connection in area (2) is replaced by a bonded connection.

Courtesy of BMW OF NORTH AMERICA, INC.

Drill bore holes (2) and (3) of diameter 6.8 mm in areas (1) for blind rivet.

Remove new part and deburr holes.

NOTE: In the areas (1), the rivet-and-bonding method is used. When drilling the bore holes, do not drill through any series welding points when possible. Place bore holes right next to the series welding point.

All further joining areas: Prepare new part for joining by welding.

The series welding point in area (4) must be moved due to bonded rivet connection (3). Replace the series spot-weld (4) by a metal active gas weld seam in area (5). Length of weld seam 10 mm.

Attention!

Structure bonding!

OBSERVE preparation of bonding surfaces.

Installation

Courtesy of BMW OF NORTH AMERICA, INC.

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

Apply adhesive K1 to bonding surfaces (1) to new part and vehicle.

Apply sealant to cavity sealing.

Install new part with alignment bracket or universal mount and secure.

Courtesy of BMW OF NORTH AMERICA, INC.

Install blind rivet N8 in area (1).

Install blind rivet N9 in area (2).

In areas (3), weld new parts in the same way as in series standard.

[4] =bonded connection.

Courtesy of BMW OF NORTH AMERICA, INC.

In areas (1), weld new parts in the same way as in series standard.

(2) = Cavity sealing

Attention!

Risk of damage!

Avoid applying excessive heat to the neighbouring adhesive areas!

New part in area (1) metal active gas weld.

Courtesy of BMW OF NORTH AMERICA, INC.