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Home >> Mercedes Benz >> 2001 >> CL55 >> Repair and Diagnosis >> Drivelines & Axles >> Differentials & Drive Axles >> Front Axle -- Noise Trouble Diagnosis -- 215 & 220 Chassis >> Trouble Diagnosis >> Knocking/rumbling noises from front axle area when driving over bumps or on bad roads - AF33.15-P-1210AG

Knocking/rumbling noises from front axle area when driving over bumps or on bad roads - AF33.15-P-1210AG

MODEL 215 

MODEL 220 except CODE (Z07) Top protection 

MODIFICATION NOTES

19.1.04 The order of the cause/remedy and the WU times have been updated    
OPERATION NO. OF OPERATION TEXTS OR STANDARD TEXTS AND FLAT RATES

Category Op. no. Operation text Time Acc. no. Code
P 023487 CHECK TORQUE STRUT JOINT 002 WU - -
P 023502 CHECK TORQUE STRUT RUBBER BUSHING 002 WU - -
P 331421 REMOVE, INSTALL TORQUE STRUT (1) OF FRONT AXLE; REPLACE IF NECESSARY 011 WU - -
P 331422 REMOVE, INSTALL TORQUE STRUTS (BOTH) FOR FRONT AXLE; REPLACE IF NECESSARY 016 WU - -
P 611071 REMOVE, INSTALL ENGINE COMPARTMENT PANELING BOTTOM FRONT SECTION (GASOLINE) 006 WU - -
P 945310 REMOVE AND INSTALL FRONT SOUNDPROOFING CAPSULE (DIESEL) ON BOTTOM OF ENGINE 006 WU - -
P 023488 CHECK BOOTS ON SUPPORT JOINT 002 WU - -
P 336370 REPLACING JOINT FOR LOWER LEFT STEERING KNUCKLE 028 WU - -
P 336380 REPLACING JOINT FOR LOWER RIGHT STEERING KNUCKLE 028 WU - -
P 023489 CHECK RUBBER BUSHING OF SPRING LINK ON FRONT AXLE 002 WU - -
P 331411 REMOVE, INSTALL SPRING LINK (1) FOR FRONT AXLE; REPLACE IF NECESSARY 014 WU - -
P 023621 REMOVE, INSTALL SPRING LINK (1) FOR FRONT AXLE (WITH FRONT AXLE REMOVED) 002 WU - -
P 331412 REMOVE, INSTALL SPRING LINKS (BOTH) FOR FRONT AXLE; REPLACE IF NECESSARY 023 WU - -
P 023620 REMOVE, INSTALL SPRING LINKS (BOTH) FOR FRONT AXLE (WITH FRONT AXLE REMOVED) 003 WU - -
P 331413 REPLACE BEARING ON ONE SPRING LINK ON FRONT AXLE (WITH SPRING LINK REMOVED) 005 WU - -
P 331414 REPLACE BEARING AT BOTH SPRING LINKS ON FRONT AXLE (WITH SPRING LINKS REMOVED) 007 WU - -
P 331050 REMOVE/INSTALL FRONT AXLE 049 WU - -
P 611069 REMOVE/INSTALL ENTIRE ENGINE COMPARTMENT PANELING (GASOLINE) AT BOTTOM 007 WU - -
P 945305 REMOVE/INSTALL SOUNDPROOFING CAPSULES (ALL) ON BOTTOM OF ENGINE 008 WU - -
P 023619 RETROFIT TEMPERATURE ENCAPSULATION (WITH FRONT AXLE REMOVED) 006 WU - -
P 023877 RETROFIT INSTALLATION OPENING ON TEMPERATURE ENCAPSULATION 003 WU - -
P 331860 REPLACE FRONT AXLE CARRIER (WITH FRONT AXLE REMOVED) 017 WU - -
P 406560 ALIGN VEHICLE (ELECTRONICALLY INCLUDING ADJUSTMENT WORK) 012 WU - -
Damage code Cause Remedy  
33 142 36   IMPORTANT Most of the complaints on front axle noises are not caused by a damaged suspension strut. For this reason do not replace suspension strut.
After inspecting torque struts that have been removed because of complaints, we have determined that a very high percent of them are actually in good working order. Therefore please do not replace the torque struts on the first instance of this problem.
If, however, the torque struts do appear to be the problem, please inspect them using the method described below and if necessary report this to the MPC with the parts. Reported parts should be sent to GSP/TPP for further inspection.		  
  Cause 1:  Remedy 1:   
33 142 36 Rubber bearing on spring link cracked. 1 Perform a visual inspection of the rubber mount for the spring link.  
  IMPORTANT Series production modifications as follows: IMPORTANT Rubber bearing cracked: ↓  
  1. Use of kidney bearing with thrust washer for all engines, as of
MODEL 220 ... A > 260150
MODEL 215 ... A > 022700		 2 Remove spring link. AR33.15-P-0170I
  2. Use of rotation-symmetrical spring link bearing with thrust washer except engine 112, as of
MODEL 220 ... A > 264960
MODEL 215 ... A > 023615		 3 Remove/install/replace spring link bushing (with spring link removed). AR33.15-P-0170-02I
    SPECIAL TOOL Extraction and insertion tool Fig 1
  3. Uniform rotation-symmetrical spring link bearing with thrust washer for all engines, as of
MODEL 220 ... A > 287630
MODEL 215 ... A > 027010		    
  IMPORTANT Temperature encapsulation introduced into series production (except 12 cylinder engine) as of IMPORTANT If there are any visible scratches on the mount: ↓  
  MODEL 220 A > 292586 4 Remove/install/replace integral carrier for front axle.  
  MODEL 215 A > 027716 MODEL 215 AR33.10-P-0100N
    MODEL 220 AR33.10-P-0100I
  IMPORTANT Temperature encapsulation introduced into series production (except 12 cylinder engine) as of
MODEL 220 A > 316716
MODEL 215 A > 031546		 5 Install spring link. AR33.15-P-0170I
    6 Retrofit temperature encapsulation on integral carrier.  
    7 Cut assembly opening on temperature encapsulation with knife (only for 12cylinder engines, see figures).  
    IMPORTANT Temperature encapsulation introduced into series production (except 12 cylinder engine) as of
Model 220 ... A > 292586
Model 215 ... A > 027716
IMPORTANT Temperature encapsulation introduced into series production on 12 cylinder engines as of
Model 220 ... A > 316716
Model 215 ... A > 031546		  
  Cause 2:  Remedy 2:   
33 113 D1 The boot on the supporting joint is damaged. This leads to play in the supporting joint. 1 Inspect boot and check for play in the supporting joint.  
  IMPORTANT Supporting joint has been modified in the series production as of VIN A 151974. IMPORTANT If damage is visible and/or excessive play present: ↓  
    2 Remove/install/replace supporting joint. AR33.20-P-0440I
  Cause 3:  Remedy 3:   
33 140 36 Torque strut joint may be worn. 1 Check torque strut joint play.  
  IMPORTANT Torque strut joint has been modified in the series production as of VIN A 204 000 IMPORTANT Lift vehicle so that there is no load on the wheels.  
    2 Move torque strut in vertical direction up and down in the vicinity of the ball joint After the torque strut joint has been improved, it can be ruled out as a cause of the noises.
IMPORTANT If, however, vehicles as of this VIN have problems with their torque struts, they should be reported to the respective MPC with the parts.		  
    IMPORTANT If play can be felt: ↓  
    3 Replace torque strut. AR33.15-P-0160I
  Cause 4:  Remedy 4:   
33 140 36 Rubber bearing on torque strut cracked. 1 Carry out visual inspection.  
    IMPORTANT Replace only if torque strut rubber bushing is visibly damaged:
↓		  
    2 Replace torque strut. AR33.15-P-0160I
Fig 1: Identifying Extraction And Press-In Tools (220 589 06 43 00)
G04840651
Fig 2: [Identifying Front Axle Noises Area]
G04840652
PARTS ORDERING NOTES

Part no. Designation Quantity
220 330 43 11 Torque strut As required
220 330 44 11 Torque strut As required
220 333 01 27 Support joint As required
220 330 91 07 Repair set (rotation symmetrical bearing/thrust washer),IMPORTANT replace only in pairs 2
220 524 10 25 Left temperature encapsulation 1
220 524 11 25 Right temperature encapsulation 1
002 995 41 01 Clip 1
000 000 00 17 703 Bolt (M5x14) 8
215 628 00 57 Integral carrier (>Q2 status) As required
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