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April 21, 2025 Service bulletin

Cracking/clicking noise from underbody when driving slowly (around curves); see attachment

Mercedes-Benz technical service bulletin LI61.20-P-077105 for 2022-2023 Mercedes-Benz AMG SL63, 2024 Mercedes-Benz AMG GT43 and 2022-2024 Mercedes-Benz AMG SL55 and others.

Bulletin number
LI61.20-P-077105
Component
Structure: body
Summary
Complaint Cracking/clicking noise from underbody when driving slowly (around curves); see attachment. Cause Potential causes: • Assembly of the underfloor paneling with unloaded body (results in tension after compression of vehicle in K0- design level) • Relative movement between front and rear engine compartment lining • Torque loss of the screw connection • Accumulation of stones and dirt Remedy • Screw connection in K0-design level (vehicle compressed) and taking into account the correct screw sequence • Additional screw connection points (minimization of relative movement) • Increase in tightening torque • Integration of spacer rings (reduction of accumulation of stones and dirt) -> see underfloor paneling rework instructions 1. Create a TIPS case and send to Body/Chassis/Entertainment inbox. 2. Attach video/recording of the noise problem to the case. Be sure the recording is clear and audible. 3. After entering the TIPS case, the aftersales kit required for rework is sent (the required parts are not yet available via the replacement parts service). 4. After receiving the aftersales kit (A2326207003), check the contents: 22 screws (A0109902604) / 14 rivet nuts + 1 replacement rivet nut (A0009902349) / 4 spacer rings (A2326207203) Underfloor paneling rework 1. Disassemble underfloor paneling. If front and rear engine compartment lining are bonded to one another, order new parts (A2326201101, A2326268900). 2. Clean underfloor paneling and integral carrier. 3. Mark four additional screw connection points on the front engine compartment lining (see attachment 1). See appendix 2 for dimensions. 4. Drill holes with d=9 mm on the markings. 5. Screw front and rear engine compartment lining together using the screw connection points already available (see attachment 3). Both linings are therefore aligned to one another. Important: Pay attention to alignment of the elongated holes on the external edges. 6. Drill into the rear engine compartment lining using the four additional holes with d=9 mm (see attachment 4). 7. Disassemble front and rear engine compartment lining. 8. Drill out three existing rivet nuts with d=9 mm (see attachment 5). 9. Insert seven new rivet nuts (A0009902349) (see attachment 6). 10. Drill out seven existing rivet nuts in the integral carrier with d=9 mm (see attachment 7). Caution: Do not damage integral carrier. 11. Remove remaining rivets that have fallen off from the integral carrier using a magnetic tube (see attachment 8). 12. Insert new rivet nuts (A0009902349) in the integral carrier (see attachment 9). 13. Fix four spacer rings (A2326207203) in place using bonding points between underfloor paneling and integral carrier (for position, see attachment 10 and attachment 11). Caution: No adhesive can be applied to the contact areas (risk of torque loss). 14. Install underfloor paneling on vehicle with 17 Nm (observe screw sequence in attachment 12). Important: Use screw item number A0109902604.

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