LI32.25-P-066246

Thumping Noises From Rear Axle Shock Absorber
Topic number
LI32.25-P-066246
Version
6
Function group
32.25 - Shock absorbers, damper struts, spring struts
Date
7/11/22
Validity
All models BR213, 205, 253, BR257 with SA code
459/489, all models BR238
only valid for vehicles produced prior to 01.01.2020
Reason for change
Note from PF Team China
Complaint
Thumping noise on rear axle shock absorber on rough road.
Cause
Until now the rear axle shock absorber support bushing was only available together with the rear axle shock absorber
as a replacement part.
In future, the rear axle shock absorber support bushing will be available individually as a replacement part to avoid
any unnecessary shock absorber noise.
Remedy
For noise problems on the rear axle shock absorbers, please always make a noise diagnosis, for example using
Chassis Ear to localize any sources of noise on shock absorbers or support bushings.
If the noise originates from the upper part of the shock absorbers, it is enough to replace the support bushings.
Otherwise the complete shock absorber including support bushing have to be replaced.
The modified support bushings must be replaced in pairs the first time so that any mixed installation of old and new is
reliably ruled out.
Note: When unscrewing the upper mounting nut on the piston rod, it is absolutely essential to use the special tools
specified below.
Under no circumstances may a pneumatic/impact wrench be used for unscrewing the upper mounting nut on the piston rod, as the piston rod will turn too and thereby damage the sealing.
1. Remove the production nut with size 17--> Special tool W 164 589 00 10 00
2. Install the replacement nut with size 16--> Special tool W454 589 01 99 00 (only the long size 16 socket) +
commercially available long size 5 Allen key
11.07.2022 17:31:38
© Copyright Mercedes-Benz AG
JKANTAR
Page 1 / 2
The tightening torque of the hexagon nut fastening the support bushing to the piston rod is 31 Nm +/- 3 Nm - The
tightening torque has been increased from that stated in the repair instructions!
WIS-References
Document number
Title
Note
AR32.25-P-0110LW
Remove/install rear shock absorber
Symptoms
Chassis/suspension > Noises > Knocks
Chassis/suspension > Noises > Thumping
Chassis/suspension > Suspension/Dampening > Suspension system noises > Thumping
Chassis/suspension > Suspension/Dampening > AIRMATIC > Noises > Thumping/rumbling
Parts
Part number
ES1 ES2 Designation
Quantity Note
EPC
A2133264800
Support bushing
2
Valid for BR205, 213, 253 and
BR257 except 459/489 support bushing for rear axle available separately
X
N910118010003
Hexagon nut
2
Hexagon nut, support bushing to piston rod - Tightening torque increased
to 31 Nm +/- 3 Nm!!
X
A2383260400
Support bushing
2
Valid for BR238 and BR257 with SA
459/489 support bushing available
separately
X
Operation numbers/damage codes
Op. no.
Operation text
322042
321062
Damage
code
Note
REPLACE 2 ELASTOMER BEARINGS
FOR 2 REAR SHOCK ABSORBERS
(SHOCK ABSORBERS REMOVED)
3233436
Replace on both sides at first replacement
REMOVE/INSTALL 2 DAMPERS OF
2ND VEH. AXLE, REPLACE
3233436
11.07.2022 17:31:38
© Copyright Mercedes-Benz AG
Time
JKANTAR
Page 2 / 2