LI32.34-P-058735

Rumbling noises from area of front axle
Topic number
LI32.34-P-058735
Version
1
Design group
32.34 Roll control (WR)
Date
03-20-2014
Validity
MODEL 166 with AIRMATIC (code 489) and ACS (ACTIVE CURVE SYSTEM, code 468)
Reason for change
Reason for block
Complaint:
Rumbling noises from the area of the front axle.
Cause:
1. AIRMATIC software not up to date.
2. ACS software not up to date.
3. Play in the bearings or faulty threaded connections of link rods of stabilizer bar.
4. Cavitation erosion in active stabilizer bar on front axle. (Formation of vapor locks in the oil of the torsion bar, which
can lead to noises)
Remedy:
1. Check whether the software of the AIRMATIC is up to date and flash to the current version if necessary.
2. Check whether the software of the Active Curve System is up to date and flash to the current version if necessary.
3. Remove link rods of stabilizer bar and perform a test drive.
If the noise no longer occurs, then the noise is being caused either by the link rods or by the active stabilizer bar.
Replace link rods.
Perform a test drive.
4. If the noise is still present, install AMG stabilizer bar.
Symptoms
Chassis/suspension / Chassis, noises / Cracking
Chassis/suspension / Chassis, noises / Knocking
Chassis/suspension / Chassis, noises / Thumping
Chassis/suspension / Suspension/Dampening / Suspension system noises / Whistling and hissing noises
Chassis/suspension / Suspension/Dampening / Suspension system noises / Thumping noise
Chassis/suspension / Suspension/Dampening / AIRMATIC / AIRMATIC noise / Whistling/hissing/flowing
Chassis/suspension / Suspension/Dampening / AIRMATIC / AIRMATIC noise / Thumping/rumbling
Chassis/suspension / Axle / Stabilizer bar / Stabilizer bar noise / Knocks
Chassis/suspension / Axle / Stabilizer bar / Stabilizer bar function / Worn out
Chassis/suspension / Chassis, noises / Howling
Chassis/suspension / Axle / Front axle / Front axle, noise / Knocking
Chassis/suspension / Axle / Front axle / Front axle, noise / Thumping
03-20-2014 12:49 PM
© Copyright Daimler AG
KOLESK
Page 1/3
Chassis/suspension / Axle / Front axle / Front axle, noise / Cracking
Parts
Part number
ES1 ES2 Designation
Quantity Note
EPC Other
make
part
A 166 320 07 89
Left torsion bar linkage
1
X
A 166 320 08 89
Right torsion bar linkage
1
X
A 166 320 34 11
Front stabilizer bar
1
AMG torsion bar as required
X
Work units
Op. no.
Operation text
54-0991
Time
Damage
code
Note
CONTROL UNIT: ......... INSTALL
SOFTWARE (AFTER QUICK TEST)
32564 90
As required for air suspension control unit
54-0991
CONTROL UNIT: ......... INSTALL
SOFTWARE (AFTER QUICK TEST)
32564 90
As required for ACTIVE CURVE SYSTEM
32-3328
REPLACE LINK RODS (BOTH) FOR
FRONT STABILIZER BAR
32211 36
As required
32-2050
REMOVE/INSTALL STABILIZER BAR
OF 1ST VEH. AXLE, REPLACE IF NECESSARY
3210D 36
As required
WIS-References
Document number
Title
Note
AR32.22-P-0300GQ
Remove/install stabilizer bar
on front axle
Allocation
Remedy
Validity
Vehicle
Engine
Transmission
166.003
*
*
166.004
*
*
166.023
*
*
166.024
*
*
166.055
*
*
166.056
*
*
166.057
*
*
166.058
*
*
166.062
*
*
166.073
*
*
166.074
*
*
03-20-2014 12:49 PM
© Copyright Daimler AG
KOLESK
Page 2/3
GL (166)
*
*
Vehicle
Engine
Transmission
166.003
651.960
722.908
166.004
651.960
722.908
166.023
642.826
722.903
166.023
642.826
725.031
166.024
642.826
722.903
166.024
642.826
725.031
166.055
276.955
722.906
166.056
276.821
722.904
166.056
276.925
722.904
166.057
276.955
722.906
166.058
276.955
722.906
166.062
276.821
722.904
166.073
278.928
722.909
166.073
278.928
725.031
166.073
278.928
725.032
166.074
157.982
722.905
166.074
157.982
722.931
166.823
642.826
722.903
166.823
642.826
725.031
166.824
642.826
722.903
166.824
642.826
725.031
166.856
276.821
722.904
166.864
276.821
722.904
166.865
276.821
722.904
166.872
278.928
722.909
166.872
278.928
725.031
166.872
278.928
725.032
166.872
278.928
725.033
166.873
278.928
722.909
166.873
278.928
725.031
166.873
278.928
725.032
166.873
278.928
725.033
166.874
157.982
722.905
166.874
157.982
722.931
Full model designation breakdown
03-20-2014 12:49 PM
© Copyright Daimler AG
KOLESK
Page 3/3