4114021 Replacing Front Left Wheel Arch

Procedure OBSERVE repair step 3

Place vehicle on straightening bench.

Wheel arch, front
Support carrier, wheel arch, outer

Following CONSUMABLES are required:

CONSUMABLES

Material	Quantity
Adhesive K1	1
Blind rivets N1	56
Punch rivets N5	39
EMC screws	4
CleanerR1	1
Cavity sealing wax remover	1
Sealant D1

Fig 1: Identifying Front Wheel Arch And Support Carrier, Wheel Arch, Outer

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Removing wheel arch

Mark severance cut (1) in front of holder (2) and cut (holder (2) remains on vehicle).

Open welded connections in area (3).

Installation:

Mark severance cut (1) in on new part and cut. Take off holder (2).

Apply sealant to cavity acoustic baffle . See 4100... INSTALLING A CAVITY ACOUSTIC BAFFLE (EXPANDED) or 4100... INSTALLING A CAVITY ACOUSTIC BAFFLE (NOT EXPANDED) (4).

Fig 2: Identifying Severance Cut With Sealant And Welding Areas

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Open welded connections in areas (1).

Fig 3: Identifying Welding Areas

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Open welded connections in area (1).

Fig 4: Identifying Welding Areas

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Open welded connections in area (1).

Installation:

If equipment compartment partition wall (2) is damaged, cut along line (3).

Mark new part in accordance with severance cut on vehicle + 20 mm extra material and cut.

Bond both parts overlapping and rivet. Depending on accessibility, use punch rivets N4 and blind rivets N3.

Fig 5: Identifying Welding Areas On Compartment Partition Wall

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Open welded connections in area (1).

Fig 6: Identifying Welding Areas

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Installing wheel arch

IMPORTANT: Do not grind/sand new parts in area of bonding surfaces.

Clean bonding surfaces with adhesive cleaning agent R1.

Apply adhesive K1 to bonding surfaces.

Install new parts and rivet with blind rivets.

IMPORTANT: Three-plate connection (1)!
In area (1) rivet new part on both sides offset with 4 punch rivets N5.

Use 14 punch rivets N5 in area (2).

Use 18 punch rivets N5 in area (3).

Fig 7: Identifying Rivet Areas On Wheel Arch

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Installation:

Vehicles with spring strut dome plate insert:

Different plate inserts are fitted, depending on the model.

Version (A) riveted or glued
Version (B) screwed

IMPORTANT: Use only identical plate inserts on both sides of the vehicle.

Riveted version:

If damaged, the plate inserts must always be replaced with glued versions on both sides of the vehicle.

Fig 8: Identifying Spring Strut Dome Plate Insert

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Glued version:

Adhesive/contact surfaces of plate insert must be free of sealant, final paint coat and underbody protection.

Do not grind off primer.

Use adhesive gun 41 3 102 in conjunction with adhesive K3.

Apply K3 adhesive in areas (1). Do not apply any adhesive in area (2).

Secure plate insert with 3 screws and nuts for 2 hours at min. 20 °C.

Fig 9: Identifying K3 Adhesive Applying Areas

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IMPORTANT: Operational strength is only achieved after 12 hours!