Cracking noises on load change from rear axle (can be heard from wheel side)
Mercedes-Benz technical service bulletin LI35.30-P-078692 for 2024 Mercedes-Benz AMG Cle53.
- Bulletin number
- LI35.30-P-078692
- Component
- Power train
- Summary
- Complaint Cracking noises on load change from rear axle (can be heard from wheel side). Cause Unfavorable manufacturing tolerances in the production process of the drive shaft. A long term solution is being investigated with high priority. Remedy If the above-mentioned customer complaint is present, a test drive and thorough NVH diagnosis must be performed in order to verify the root cause of the noise. If the axle shafts have been identified as the source of the noise, determine the vehicle production date and perform the following steps: (Date format > MM/DD/YYYY) Vehicles up to production date 12/09/2024: 1. Replace both rear axles with A 214 350 44 06 2. Tighten the axle shaft bolt to a torque of 80 Nm + 90° Note! This bolt must be replaced after removal due to the angle torque per AH00.00-P-0020-01A: Notes on threaded connections fastened using a tightening angle-based tightening process Vehicles as of production date 12/10/2024: Do not replace any parts (wheel bearing, axle shaft) as it will not resolve the concern. A 214 350 44 06 must not be replaced. 1. Remove both axle shafts 2. Clean the contact surface of the axle shaft and wheel bearing (remove old molykote with potential debris from wear) 3. (Stir molykote in container before use) Apply a generous layer of Molykote to the axle shaft from the contact surface up to the middle of the splines. Allow to dry for 30 minutes. 4. Apply a second layer and allow to dry completely for at least 1 hour 5. Reinstall both axle shafts 6. Tighten the axle shaft bolt to a torque of 80 Nm + 90° Note! This bolt must be replaced after removal due to the angle torque per AH00.00-P-0020-01A: Notes on threaded connections fastened using a tightening angle-based tightening process If rear axle shafts A214 350 44 06 are installed and the above molykote application has already been performed, please submit a TIPS case to the Powertrain inbox with the following information: - Initial Quick Test w/ Freeze Frame Data - Video or Sound file of the noise concern with details of where the recording was taken (ex. inside/outside vehicle, where sensors were placed) - Clear photos of part labels on both rear axle shafts - If possible, breakaway torque when loosening the axle bolt - Clear photos of the mating surfaces of rear axle shafts and wheel bearings
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