Rear Longitudinal Member Preparation For Installation - Ar64.20-P-1200-23MFA (With Code U55) (Except Code U54)

Model 177.0, 247.0/6/7 

with code U55 (Multi-link axle) 

except code U54 (Compound-link axle) 

The next steps are shown on the left side of the vehicle. In case of damage on the right side of the vehicle, these steps must be performed analogously.

The higher-level service document as well as the safety information in the service document must be observed.

Courtesy of MERCEDES-BENZ USA

1. Mark separating point on rear seat reinforcement (3) and separate (area A).

   Transfer separation point from vehicle.

2. Grind mating surface on rear seat reinforcement (3) down to bare metal in cross-hatched area.
3. Remove grinding dust.
4. Apply zinc dust paint in cross-hatched area.

   Courtesy of MERCEDES-BENZ USA

5. Grind mating surfaces on the cover (4) down to bare metal in the cross-hatched areas.
6. Remove grinding dust.

   Observe pretreatment of bonding surfaces.

   Courtesy of MERCEDES-BENZ USA

   Courtesy of MERCEDES-BENZ USA

7. Install, fit and fix in place covers (5.1, 5.2) at rear longitudinal member (1).
8. Mark position of cover (5.1) relative to cover (5.2).
9. Remove covers (5.1, 5.2).
10. Grind covers (5.1, 5.2) on both sides down to bare metal and coat on insides with zinc dust paint (area D).
11. Align cover (5.1) to cover (5.2) at the marked position and fix in place.
12. Covers (5.1, 5.2) (area D).

    Courtesy of MERCEDES-BENZ USA

13. Grind mating surfaces on covers (5.1, 5.2) down to bare metal in cross-hatched areas.
14. Remove grinding dust.

    Observe pretreatment of bonding surfaces.

    Courtesy of MERCEDES-BENZ USA

15. Grind mating surfaces on rear longitudinal member (1) down to bare metal in cross-hatched areas.
16. Remove grinding dust.
17. Apply 2-component adhesive in cross-hatched areas to rear longitudinal member (1) (areas B₁ and B₂ ).

    Observe pretreatment of bonding surfaces and manufacturer's specifications for drying and processing time of 2-component adhesive.

    Courtesy of MERCEDES-BENZ USA

18. Assemble, fit and fix in place rear longitudinal member (1) and covers (5.1, 5.2).
19. Rear longitudinal member (1) and covers (5.1, 5.2) (areas C₁ , C₂ , C₃ , C₄ , C₅ and C₆ ).
20. Drill out rivet holes in suspension strut support (1.1) with Ø 6.7 mm (areas E₁ ).
21. Drill off rivets on suspension strut support (1.1) with Ø 6.5 mm (areas E₂ ).
22. Remove suspension strut support (1.1).

    Courtesy of MERCEDES-BENZ USA

    Courtesy of MERCEDES-BENZ USA

23. Grind mating surfaces on longitudinal member (1) and suspension strut support (1.1) down to bare metal in cross-hatched areas.

    Grind mating surfaces on suspension strut support (1.1) on inside down to bare metal (areas E3).

    Observe pretreatment of bonding surfaces.

24. Remove grinding dust.
25. Apply 2-component adhesive in cross-hatched areas to longitudinal member (1).

    Observe pretreatment of bonding surfaces and manufacturer's specifications for drying and processing time of 2-component adhesive.

    Courtesy of MERCEDES-BENZ USA

26. Rivet suspension strut support (1.1) with rivets Ø 6.5x12.5 (areas E₄ ).

    Courtesy of MERCEDES-BENZ USA