Disassemble/assemble suspension strut

AR32.25-P-1018FR

Disassemble/assemble suspension strut

17.10.2018

Model

257, 290

except code 489 (AIR BODY CONTROL)

Modification notes

15.10.2018

Special tool updated.

Step 6

Shown on model 257 except code M005 (4MATIC)

1

Nut

6

Stop buffer

11

Tensioning device

2

Spring retainer

7

Bellows

12

Clamping plates

3

Shim (for load group L1 or L2)

8

Piston rod

13

Suspension strut

4

Spring seat

9

Support ring

5

Spring

10

Shock absorber

Alignment of spring cup (2) to shock absorber (10)

2

Spring retainer

5

Spring

10

Shock absorber

 Warning

Risk of injury caused by pinching or crushing when working on springs or spring bodies that are under tension

Use only approved tensioning devices; additionally screen off hazardous area if necessary. Check special tools for damage and proper operation (visual inspection). Wear protective gloves.

AS00.00-Z-0001-01A

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

Notes on repair work on suspension components

AH00.00-P-0100-01A



Remove

1

Remove suspension strut (13).

AR32.25-P-1017FR

 

Disassemble/assemble

2

Clamp tensioning device (11) in vise and insert clamping plates (12).

 Clamping plate

*230589116300

 Tensioning device

*203589013100

3

Insert suspension strut (13) into tensioning device (11).

 Insert suspension strut (13) to tension as many spring coils (5) as possible.

4

Place match marks on spring (5) and clamping plates (12) using adhesive strips.

 Do not use a touch-up paint pen because the spring (5) is color coded.

5

Clamp spring (5) until spring retainer (2) is relieved.

 Assembly: Align spring retainer (2), as shown, to shock absorber (10).

6

Counterhold piston rod (8), unscrew nut (1) and remove spring retainer (2) as well as spring seat (4).

 Do not use an impact wrench.

 Assembly: Depending on the spring (5) involved, none, one or two shims (3) are fitted between the spring cup (2) and the spring seat (4).
The spring (5) has an appropriate marking on the fourth coil. The last two characters define the load group and thereby the installation of the shims (3).
L1 = Two shims (3)
L2 = One shim (3)
L3 = No shim (3)

 Nut, piston rod to head bearing

*BA32.25-P-1003-04P

 Socket set

*001589031600

7

Remove shock absorber (10) from spring (5).

8

Remove boot (7) and stop buffer (6).

9

Release tensioning device (11) and remove spring (5).

 Assembly: When replacing the spring (5) transfer the marking on the old spring (5) to the new spring (5).

 Assembly: Make sure that the marking on the fourth coil of the spring is not concealed by the tensioning device (11).



Check

10

Check shock absorber (10) for damage and leakage.

In the event of a problem,



Replace shock absorber (10).

11

Check boot (7), stop buffer (6) and spring seat (4) for wear.

In the event of a problem,



Replace boot (7), stop buffer (6) or spring seat (4).

12

Assembly in reverse order



Install

13

Install suspension strut (13).

AR32.25-P-1017FR

 Suspension struts

Number

Designation

Model 257

Model 290

BA32.25-P-1003-04P

Nut, piston rod to head bearing

Nm

30

39