Trailer coupling, install subsequently (Trailer Hitch)

Luggage compartment carpet, rear panel inner trim. Remove rubber seal. Remove rear panelling - see operation "Rear Panelling, Remove and Install" in Group "A".  

Notice: 

Heat insulating material from luggage compartment floor, heat with hot-air dryer and remove after marking.  

Illustration D 6149 shows bore holes on Models 51, 52, 53, 54, 58, 59. Drill  
4 holes Ø 14 mm/0.56 in., 2 holes Ø 3,5 mm/0.14 in. in floor panel. Use existing punch marks in floor panel, above left and right side members.  

Illustration E 6076 shows bore holes on Models 53, 54, 58, 59. Drill 4 holes  
Ø 14 mm/0.56 in. in rear end panel. Use existing punch marks.  

Illustration E 6077 shows bore holes on Models 51, 52. Drill 4 holes  
Ø 14 mm/0.56 in. in rear end panel. Use existing punch marks.  

Illustration E 6078 shows drill holes for Models 53-B, 56, 57. Drill 3 holes  
Ø 14 mm/0.56 in. in luggage compartment floor panel and two holes in each side member. Use existing punch marks.  

Illustration E 6079 shows drill holes for Models 53-B, 56, 57. Drill 4 holes  
Ø 14 mm/0.56 in. in rear end panel. Use existing punch marks.  

Illustration D 6180 shows Models 53, 54, 58, 59. Apply Sealing Compound around fastening holes. Insert frame (1) in rear end panel. Fasten frame with self-tapping screws (3). Insert lower retaining plate (2) in side member and fasten with nuts (4).  

Illustration D 6181 shows Models 53, 54, 58, 59. Bolt retaining plate (2) with coupling ball to rear end panel using nuts (4). Bolt on frame (1) to wheel recess.  

Illustration D 6183 shows Models 51, 52. Apply Sealing Compound around fastening holes. Bolt inner retaining plate (1) with reinforcement (4) to vehicle floor. Bolt retaining plate (2) together with inner retaining plate (1) to rear end panel using nuts (3).  

  Tighten (Torque)   

Models 51, 52  

M 10 nuts - 45 Nm/33 lbf. ft.
M 8 nuts - 22 Nm/16 lbf. ft.

Illustration D 6182 shows Models 51, 52. Bolt reinforcement plate (2) with inner retaining plate to wheel recess using nuts (4). Bolt reinforcement plate (2) to retaining plate (1) with bolts and nuts (3).  

Illustration D 8412 shows Models 53-B, 56, 57. Apply Sealing Compound around fastening holes. Insert frame (1) in rear end panel. Insert lower retaining plate (2) in side member and bolt on.  

Illustration D 8413 shows Models 53-B, 56, 57. Bolt retaining plate (5) with coupling ball to frame (4). Bolt frame (4) with reinforcement (3) to luggage compartment floor.  

Saw out rear panelling up to MY '94  

Removable ball end rod: according to marking on reverse side. Fit cover cap.  

Non-removable ball end rod: saw out rear panelling around ball end rod.  

Illustration shows Model 53, proceed analogously for other models.  

Saw out rear panelling as of MY '95  

Removable ball end rod: Saw along mark (1) on rear side of rear panelling. Fit cover cap.  

Non-removable ball end rod: Saw along mark (2) on rear side of rear panelling.