Remove/install front shock absorber - AR32.25-P-0105MCU

MODEL 451.3/4 

Fig 1: Identifying Front Shock Absorber Remove/Install Components

Courtesy of MERCEDES-BENZ USA

MODIFICATION NOTES

11.5.11

Zinc washer installation in spring cup added

	Remove/install
	Risk of injury  caused by pinching or crushing  when working on springs or spring bodies that are under tension	Use only approved tensioning devices; shield off hazard area if necessary. Check special tools for damage and proper operation (visual inspection). Wear protective gloves.	AS00.00-Z-0001-01A
	Notes on self-locking nuts and bolts		AH00.00-N-0001-01A
	Daimler AG has not specifically called for the springs (1) to be changed in pairs, but it is advisable
1	Remove left or right front suspension strut		AR32.25-P-1017MCU
2	Clamp assembly tool set (2) in vise	Check assembly tool set (2) is firmly seated in vise. Assembly tool set	Figure
3	Insert suspension strut with spring (4) into the assembly tool set (2) and slightly pretighten	The spring windings (4) must be reliably contained. This serves to prevent the assembly tool set (2) slipping off.
4	Tension spring (4)	Springs (4), that were installed without any zinc shims (12, 13), have to be replaced with a new spring (4) with larger diameter. This serves to prevent the suspension strut from being damaged. Do not use an impact wrench when clamping. Clamp spring (4) far enough until the spring cup (5) is exposed : Pay attention to the correct seat of the spring (4) on the end stop (9) of the damper (1). Paint damage on the spring (4) should be rectified. Preservation agent	*BR00.45-Z-1003-05A
5	Unscrew nut (7)	Do not turn the piston rod. Otherwise the shock absorber (1) may be damaged. Counterhold the piston rod of the shock absorber (1) using a Torx bit (size T45) and a shank length of 100 mm. If the nut (7) is jammed, push back the boot (3) and fasten the holding device (10) to the piston rod of the shock absorber (1) then counterhold with open end wrench (11). Open end wrench	Figure
		Holding device	Figure
			*BA32.25-P-1001-04D
6	Remove rubber mount (6) with thrust bearing (8)	: Check that the thrust bearing (8) is in good condition and is not worn; replace if necessary.
7	Remove spring cup (5) and pull shock absorber (1) out of spring (4)	: Use new spring cup (5) with zinc shim (12).
8.1	Remove zinc shim (13)	For vehicles with zinc shim (13). If necessary, expand the zinc shim (13) on the shock absorber (1) from below. : Use new zinc shim (13). Check end stop (9) is correctly positioned. The zinc shim (13) must be flush-fitted to the lower spring seat.
8.2	Clean lower spring seat of shock absorber (1) using wire brush	For vehicles without zinc shim (13). : Use new zinc shim (13). Check end stop (9) is correctly positioned. The zinc shim (13) must be flush-fitted to the lower spring seat.
9	Install in the reverse order

SUSPENSION STRUTS

Number	Designation		Model 451.3/4
BA32.25-P-1001-04D	Self-locking nut, spring cup to piston rod	Nm	60

Fig 2: Identifying Open End Wrench (450 589 01 01 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Assembly Tool Set (450 589 08 99 00)

Courtesy of MERCEDES-BENZ USA

Fig 4: Identifying Holding Device (451 589 00 63 00)

Courtesy of MERCEDES-BENZ USA

REPAIR MATERIALS

Number	Designation	Order number
BR00.45-Z-1003-05A	Cavity sealant, solvent-free (1 l container)	A 000 986 72 70 05