Remove/install the suspension strut - AR32.25-P-1017RT

MODEL 251 

Shown on model 251 with engine 113, with AIRmatic (air suspension with level adjustment and adaptive damping system ADS), code 489 

Shown on model 251 with engine 113, with AIRmatic (air suspension with level adjustment and adaptive damping system ADS), code 489 

Shown on model 251 with engine 113, with AIRmatic (air suspension with level adjustment and adaptive damping system ADS), code 489 

Shown on model 251, with AIRmatic (air suspension with level adjustment and adaptive damping system ADS), code 489 

Shown on model 251, with AIRmatic (air suspension with level adjustment and adaptive damping system ADS), code 489 

	Risk of death  caused by vehicle slipping or toppling off of the lifting platform.	Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer.	AS00.00-Z-0010-01A
	Notes on AIRmatic		AH32.22-P-1000-02RT
	Remove/install
1	Open engine hood and raise to vertical position		AR88.40-P-1000RT
2	Jack up vehicle until the wheels are clear of the ground	MODEL 251 with CODE 489 (AIRMATIC)
			AR00.60-P-1000RT
3	Fully deflate air springs at front using STAR DIAGNOSIS	MODEL 251 with CODE 489 (AIRMATIC) The vehicle may not be standing on its wheels.
4	Remove bolts (8), slide cover (9) towards the vehicle center (arrow A) and remove upwards	Bolt, partition wall reinforcement between wheel well liners to fender	*BA62.30-P-1008-01E
5	Remove bolts (3), remove partition wall between wheel well liners (4)		AR62.30-P-2400RT
		Bolt, partition wall between wheel well liners to wheel well liners	*BA62.30-P-1007-01E
6	Unclip clamps (1) from the air inlet duct of the air conditioning (2), remove air inlet duct of the air conditioning (2) upwards	If the right front suspension strut (18) is to be removed. Make sure that the guide at the bottom of the air conditioning air inlet duct (2) is seated correctly in its mounting. Make sure that the air spring compressed air line (5) is not jammed, pinched or kinked.
7	Unclip air pipe (7) from clip (6) and carefully move backward out of working area, behind brake fluid expansion reservoir	If the left front suspension strut (18) is to be removed. Make sure that the air pipe (7) is seated correctly in its lower mounting.
8	Remove nuts (10) and nut (10a)	The nut (10a) is already mounted, but still needs to be tightened.
		Nut for shock absorber on front end	*BA32.25-P-1001-01H
9.1	Remove bracket (11)	On vehicles with steel suspension on front axle
9.2	Fold bracket (11) far enough back and place on the spring tower so that the compressed air line union nut (12) is accessible	MODEL 251 with CODE 489 (AIRMATIC)
10	Unscrew compressed air line union nut (12), remove air spring compressed air line (5)	Seal off the air spring compressed air line (5) using a blind plug for the duration of the repair work If pressure line or its connection fittings are damaged: ↓ Repair AIRmatic pressure line connection. MODEL 251
		Repairing AIRmatic pressure line connection	AR32.22-P-2001-02RT
		Leak detection spray	*BR00.45-Z-1002-03A
		Leakage detection spray for USA	*BR00.45-Z-1004-03A
		MODEL 251 with CODE 489 (AIRMATIC) MODEL 251 without CODE 489 (AIRMATIC)	*BA32.22-P-1004-03C
		Socket wrench bit	Figure
		Knife	Figure
11	Remove front wheel
			AP40.10-P-4050RT
12	Lift vehicle to half height		AR00.60-P-1000RT
13	Remove fender liner front section in front fender	MODEL 251 with CODE 489 (AIRMATIC)
			AR88.10-P-1310RT
14	Release ADS plug (13a) and detach from ADS connector coupling (13b)	MODEL 251 with CODE 489 (AIRMATIC)
15	Release catch lug (14) using a suitable tool (arrow B), detach ADS connector coupling (13b) from its fastening	MODEL 251 with CODE 489 (AIRMATIC)
16	Unclip the ADS cable (26) from the bracket in the wheel housing	MODEL 251 with CODE 489 (AIRMATIC)
17	Open bracket of brake hose (25), unclip brake hose (24)	On vehicles with 4MATIC.
18	Unscrew nut (19), remove link rod from front suspension strut (18)	Nut, torsion bar linkage to front suspension strut	*BA32.20-P-1003-02L
19.1	Cut off cable ties (23), remove retaining clip of brake hose (22) from steering knuckle (17)	On vehicles with 4MATIC. Pay attention to installation position. Install a new cable tie (23).
		Pliers	Fig 8
19.2	Undo bracket of brake hose from front suspension strut (18); to do this, separate cable ties	On vehicles without 4MATIC.
20	Unscrew nut (20), detach tie rod using thrust piece and puller from steering knuckle (17)	On vehicles with 4MATIC.
		Self-locking nut, tie rod to steering knuckle	*BA46.40-P-1002-01L
		Thrust piece	Fig 9
		Puller	Fig 6
21	Unscrew nut (16), detach steering knuckle (17) using thrust piece and puller from top transverse control arm (15)	On vehicles with 4MATIC.
		Self-locking nut, upper ball joint out of upper transverse control arm to steering knuckle	*BA33.20-P-1001-01L
		Thrust piece	Fig 9
		Puller	Fig 7
22	Prop up lower transverse control arm	On vehicles with 4MATIC.
23	Pull axle shaft by tilting the steering knuckle (17) at its lower mounting out of the front axle gear, then place gearing of axle shaft onto a soft underlay	MODEL 251 with CODE 489 (AIRMATIC) The axle shaft should be horizontal, as it can then be pulled out of the front axle gear or pushed into it without any great effort.
24	Push front axle shaft out of front axle shaft flange, remove front axle shaft	On vehicles with steel suspension and 4MATIC.
			AR33.30-P-0620RT
25	Unscrew nut of bolted connection (21), remove bolt	Perform final tightening when the vehicle is on the measuring platform or in the K0 position. The rubber mounts must not be subjected to stress.
		Self-locking nut, shock absorber to wishbone	*BA32.25-P-1002-01H
26.1	Lower and remove support, tilt steering knuckle (17) as far down as possible and turn to rear, remove front suspension strut (18)	On vehicles with 4MATIC. Lower the vehicle far enough so that the spring tower is accessible from above. Insert the three studs at the upper end of the front suspension strut (18) through the holes in the spring tower, screw on nut (10a) as far as possible by hand. Raise the vehicle halfway again.
26.2	Pull the spring control arm downwards and remove the front suspension strut (18)	On vehicles without 4MATIC. An assistant is required.
	Check
27.1	Check front suspension strut (18) and air spring for signs of damage and wear, if necessary replace front suspension strut (18)	MODEL 251 with CODE 489 (AIRMATIC)
27.2	Check front suspension strut (18) and all components for damage and wear, replace front suspension strut (18) or components if necessary	On vehicles with steel suspension.
28	Install in the reverse order
	Check
29	Check AIRmatic for leaks	MODEL 251 with CODE 489 (AIRMATIC)
			AR32.22-P-8100RT
30	Remove transport fastening or split ring below air spring bellows	MODEL 251 with CODE 489 (AIRMATIC)
31	Check headlamp adjustment, correct if necessary
		Only for vehicles with steel suspension and only of the front suspension strut (18) or components of the front suspension strut (18) were replaced or if the vehicle level has been adjusted.	AP82.10-P-8260RT

Number	Designation			Model 251
BA32.20-P-1003-02L	Nut, torsion bar linkage to front suspension strut	Stage 1	Nm	100
		Stage 2: Loosen	∠°	180
		Stage 3	Nm	120
		Stage 4	∠°	45

Number	Designation		MODEL 251 with CODE 489 (AIRMATIC)	MODEL 251 without CODE 489 (AIRMATIC)
BA32.22-P-1004-03C	Air suspension pressure line to front air suspension	Nm	5	-

Number	Designation			MODEL 251
BA32.25-P-1001-01H	Nut for shock absorber on front end	Stage 1	Nm	30
		Stage 2	∠°	-180
		Stage 3	Nm	27

Number	Designation		MODEL 251
BA32.25-P-1002-01H	Self-locking nut, shock absorber to wishbone	Nm	265

Number	Designation			MODEL 251
BA33.20-P-1001-01L	Self-locking nut, upper ball joint out of upper transverse control arm to steering knuckle	Stage 1	Nm	20
		Stage 2	∠°	90

Number	Designation			MODEL 251
BA46.40-P-1002-01L	Self-locking nut, tie rod to steering knuckle	Stage 1	Nm	45
		Stage 2	∠°	90

Number	Designation		MODEL 251
BA62.30-P-1007-01E	Bolt, partition wall between wheel well liners to wheel well liners	Nm	23

Number	Designation		MODEL 251
BA62.30-P-1008-01E	Bolt, partition wall reinforcement between wheel well liners to fender	Nm	10

Number	Designation	Order number
BR00.45-Z-1002-03A	Leak detection spray
BR00.45-Z-1004-03A	Leakage detection spray for USA