41 14 021 Replacing Front Left Wheel Arch

Read contents of BODY, GENERAL .

The reduced-weight aluminium front end structure (GRAV) is used on this vehicle.

Observe specific procedure. 

Place vehicle on straightening bench.

Following new body parts are required :

• Wheel arch, front
  Fig 1: Identifying Wheel Arch, Front

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Open rivet joints in areas (1) to (3).

As a rule, part of the punch rivet remains in the engine carrier in areas (2) and (3). Drill out remnants.

Open EMC WELD SEAM  in area (1).

Installation: 

Carry over hole pattern  from engine carrier to new part in areas (1) to (3).

Use 4 rivets (size 13) in areas (1).

Use 6 rivets (size 13) in areas (2).

Use 8 rivets (size 15) in areas (3).

Fig 2: Identifying Rivet Joints Areas

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Use 2 EMC SCREWS  in areas (1).

Use 2 EMC SCREWS  in areas (3).

If an engine carrier partial replacement has been carried out, 2 EMC SCREWS  must also be used in areas (2).

Fig 3: Identifying EMC Screws Areas

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Open rivet joints in areas (1) and (2).

As a rule, part of the punch rivet remains in the units compartment partition wall in areas (1) and (2). Drill out remnants.

Installation: 

Carry over bores from units compartment partition wall to new part in area (2).

Use 3 rivets (size 13) in area (1).

Use 2 rivets (size 13) in area (2).

Fig 4: Identifying Rivet Joints Areas

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Open rivet joints in areas (1).

Installation: 

Use 2 rivets (size 13) in areas (1).

Fig 5: Identifying Rivet Joints Areas

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Open weld joints in areas (1) and (2).

Open rivet joints in area (2).

Installation: 

If necessary, replace brazed seams with MAG weld seams in area (1).

Use 2 rivets (size 13) in area (2).

Fig 6: Identifying Weld Joints Areas

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Open weld joints in areas (1).

Fig 7: Identifying Weld Joints Areas

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Open weld joints in area (1).

Mark severance cut according to measurement a and cut inside A-pillar.

Measurement a = 47 mm from center of bore.

Fig 8: Identifying Severance Cut According Mark To Measurement A And Cut Inside A-Pillar

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Fig 9: Identifying Measurement Line Between Right Wheel Arch And Centre Of Bore

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Different riveting-down elements, depending on the equipment specification, must be mounted on the new component.

Required tools are featured on the Workshop Equipment Planning CD (WEP).

Preparation of new part: 

Mark severance cut (1) according to vehicle. Cut outer metal sheet only.

Drill out metal sheet in areas (2).

Installation: 

Adjust new part to fit with straightening attachment or universal mount.

Let parts overlap 10 mm at severance cut (1).

Weld new component from inside and outside over entire length (from outside if accessible).

Drill holes for rivets.

Bond  new part.

Rivet  new part.

Fig 10: Identifying Severance Cut Mark According To Vehicle

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Installation: 

Seal new component in area (1) with sealing compound.

Fig 11: Identifying New Component Seal Area

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Installation: 

There is no bore hole (1) for the support bearing centering pin in the new component!

Prior to installing spring strut, remove support bearing centering pin.

Fig 12: Identifying Bore Hole

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