Remove/install spring control arm on front axle

AR33.15-P-0170FR

Remove/install spring control arm on front axle

29.11.2019

Model

257

Shown on left side of vehicle except code M005 (4MATIC)

1

Nut

2

Spring control arm

3

Steering knuckle

4

Nut

5

Suspension strut

6

Nut

7

Stabilizer bar linkage

8

Nut

9

Front axle carrier

Shown on right side of vehicle with code M005 (4MATIC)

2

Spring control arm

4

Nut

5

Suspension strut

10

Electrical lines

11

Bracket

 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

 Caution

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.

AS00.00-Z-0017-01A

Topical note

Notes on AIR BODY CONTROL

Model 257
with code 489 (AIR BODY CONTROL)

AH32.22-P-1000-03LWO

Topical note

Notes on handling, transport and storage of composite brake disks

AH42.10-P-9406-12LF

Topical note

Notes on threaded connections fastened using a tightening angle-based tightening process

AH00.00-P-0020-01A

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

Note on calculation of tightening torque when using insertion or socket tools with various effective lengths

AH00.00-P-0015-01CW

Notes on safety-relevant components

AH00.00-Z-0019-01A

Notes on repair work on suspension components

AH00.00-P-0100-01A

 

Remove/install

1

Vent pressure in AIRMATIC system using vehicle diagnosis system.

Model 257
with code 489 (AIR BODY CONTROL)



AD00.00-P-2000-06FR

2

Remove center and rear engine compartment lining.

AR61.20-P-1105FR

3

Remove front wheel.

AR40.10-P-1102A

4

Unhook electric lines (10) from holder (11) and place to one side.

Model 257
with code M005 (Vehicles with 4MATIC/all-wheel drive)


Do not kink, crush or stretch electric lines.
Otherwise, the lines will be damaged and malfunctions will occur.

5

Unscrew nut (4) and remove suspension strut (5) from spring link (2).

Model 257
with code 489 (AIR BODY CONTROL)

AR32.25-P-1017FRA

Model 257
except code 489 (AIR BODY CONTROL)

AR32.25-P-1017FR


Route suspension strut (5) on spring control arm (2) in suspension strut linkage area to one side.
Otherwise, the elastomer boot on the suspension strut joint will be damaged.

6

Unscrew nut (6) and remove torsion bar linkage (7) from spring link (2).

Model 257
except code M005 (Vehicles with 4MATIC/all-wheel drive)


The ball head must be counterheld and an impact wrench/driver must not be used.
Otherwise the ball head gets damaged.

7

Remove stabilizer bar from front axle.

Model 257
with code M005 (Vehicles with 4MATIC/all-wheel drive)

AR32.35-P-2200FRA

 The torsion bar linkage (7) remains installed on the stabilizer bar.

8

Unscrew nut (8) and remove spring link (2) from front axle carrier (9).

 Bolt, spring control arm to front axle carrier

*BA33.20-P-1002-01U

9

Unscrew nut (1), detach and remove spring link (2) from steering knuckle (3).


Counterhold the ball head and do not use an impact wrench/driver.
Otherwise the ball head or steering knuckle (3) may be damaged.

 Nut, spring control arm to steering knuckle

*BA33.20-P-1001-01U

 Model 257 with engine 256
with code M005 (Vehicles with 4MATIC/all-wheel drive)
Socket wrench

*167589000900

10

Remove holder (11) from spring link (2).

Model 257
with code M005 (Vehicles with 4MATIC/all-wheel drive)
When replacing the spring control arm (2).



Check

11

Check sealing bellows and ball head of spring link (2) for damage.

If damage is found,



replace spring link (2).

12

Check suspension strut linkage on spring link (2) for damage.

If damage is found,



replace spring link (2).

13

Check suspension strut linkage on spring link (2) for damage.

Model 257
except code M005 (Vehicles with 4MATIC/all-wheel drive)

If damage is found,



replace spring link (2).

14

Check if an elastomer bearing for caster correction is installed in the previously-installed spring link (2).

When replacing the spring control arm (2).

 The elastomer bearing for caster correction has an off-center bearing core.

If an elastomer bearing for caster correction is installed,



remove elastomer bearing of new spring link (2) and install a corresponding elastomer bearing for caster correction.

Model 257
except code M005 (Vehicles with 4MATIC/all-wheel drive)

AR33.15-P-0001-01FR

Model 257
with code M005 (Vehicles with 4MATIC/all-wheel drive)

AR33.15-P-0001-01FRA

 Model 257
with code M005 (Vehicles with 4MATIC/all-wheel drive)
Sleeve

*203589001400

 Model 257
with code M005 (Vehicles with 4MATIC/all-wheel drive)
Extraction and insertion tool

*222589034300

 Model 257
except code M005 (Vehicles with 4MATIC/all-wheel drive)
Extraction and insertion tool

*220589064300

 Model 257
except code M005 (Vehicles with 4MATIC/all-wheel drive)
Extraction and installation tool

*221589004300

 Model 257
except code M005 (Vehicles with 4MATIC/all-wheel drive)
Press-in tool

*211589004300

15

Check elastomer bearing in spring link (2) for damage.

When reusing the spring link (2).

Evaluation of elastomer bearings

AH00.10-P-0001-01A

 The neutral elastomer bearing has a central bearing core.
The elastomer bearing for caster correction has an off-center bearing core.

If damage is found and a neutral elastomer bearing is installed,



replace spring link (2).

If damage is found and an elastomer bearing for camber correction is installed,



replace elastomer bearing on spring link (2).

Model 257
with code M005 (Vehicles with 4MATIC/all-wheel drive)

AR33.15-P-0001-01FRA

Model 257
except code M005 (Vehicles with 4MATIC/all-wheel drive)

AR33.15-P-0001-01FR

 Model 257
with code M005 (Vehicles with 4MATIC/all-wheel drive)
Sleeve

*203589001400

 Model 257
with code M005 (Vehicles with 4MATIC/all-wheel drive)
Extraction and insertion tool

*222589034300

 Model 257
except code M005 (Vehicles with 4MATIC/all-wheel drive)
Extraction and insertion tool

*220589064300

 Model 257
except code M005 (Vehicles with 4MATIC/all-wheel drive)
Extraction and installation tool

*221589004300

 Model 257
except code M005 (Vehicles with 4MATIC/all-wheel drive)
Press-in tool

*211589004300

16

Install in the reverse order.

17

Perform chassis alignment.

AR40.20-P-0200FR

 Wheel control, hub

Number

Designation

Model 257

BA33.20-P-1001-01U

Nut, spring control arm to steering knuckle

Nm

250

 Wheel control, hub

Number

Designation

Model 257

BA33.20-P-1002-01U

Bolt, spring control arm to front axle carrier

Stage 1

Nm

120

Stage 2

°

180