No. 2106
Service Bulletin Details
Public Details for: No. 2106
Advanced technical information on how to remedy a clicking noise from centerlock wheels from the 991 generation 911.
- 2019 - 2018 - 2017 - 2016 - 2015 - 2014 -
Models from 2019
2019 PORSCHE 911 |
2019 PORSCHE 911 GT2 |
2019 PORSCHE 911 GT2 RS |
2019 PORSCHE 911 GT3 |
2019 PORSCHE 911 GT3 RS |
2019 PORSCHE 911 TURBO |
Models from 2018
2018 PORSCHE 911 |
2018 PORSCHE 911 GT2 RS |
2018 PORSCHE 911 GT3 |
2018 PORSCHE 911 TURBO |
Models from 2017
2017 PORSCHE 911 |
2017 PORSCHE 911 CARRERA |
2017 PORSCHE 911 TARGA 4 |
2017 PORSCHE 911 TURBO |
Models from 2016
2016 PORSCHE 911 |
2016 PORSCHE 911 CARRERA |
2016 PORSCHE 911 GT3 |
2016 PORSCHE 911 GT3 RS |
2016 PORSCHE 911 R |
2016 PORSCHE 911 TARGA 4 |
2016 PORSCHE 911 TURBO |
Models from 2015
2015 PORSCHE 911 |
2015 PORSCHE 911 CARRERA |
2015 PORSCHE 911 GT3 |
2015 PORSCHE 911 TARGA 4 |
2015 PORSCHE 911 TURBO |
Models from 2014
2014 PORSCHE 911 |
2014 PORSCHE 911 CARRERA |
2014 PORSCHE 911 GT3 |
2014 PORSCHE 911 TARGA 4 |
2014 PORSCHE 911 TURBO |
4 Bulletin #: 2106 Advanced Technical Information Part ID: 4405 991 – Clicking Noises from Centerlock Wheels Vehicles Affected Models Model Year Model Type VIN Range Vehicle-Specific Equipment 911 Carrera GTS, Turbo, Turbo S, GT3, GT3RS, GT2RS, Speedster As of 2014 up to 2019 991 N/A Centerlock wheel nuts, aluminum alloy wheels, and PCCB brake discs Revision History Revision Release Date Changes 0 April 9, 2021 Original document Condition The customer complains of clicking noises from the front of the vehicle while turning, typically at slow speeds. Figure 1 Clicking Noise Example (Sound File) In order to play this sound file, you need to enable “playing of 3D content” under 3D & Multimedia in the preference settings (Edit) of Adobe Acrobat. Technical Background The wheels may experience “micro-movements” at the interface with the brake disc bell during driving. Micromovements may be caused by an insufficient pretension of the centerlock nut, reduced friction values between multiple contact surfaces, or geometrical discrepancies between parts. These micro-movements may cause material to be transferred from the aluminum alloy wheels to the brake disc bell. The transferred material may cold-weld to the brake disc bell, causing a “stick-slip” effect. The stick-slip effect produces clicking noises while turning. AfterSales April 9, 2021 Page 1 of 5 Bulletin #: 2106 Advanced Technical Information Part ID: 4405 4 Service Information To eliminate the clicking noises, please perform the following: 1. 2. Remove both front wheels and both front brake discs. Visually inspect for damage on the brake discs, wheel hubs, wheel cones (seat on the wheel for the center lock nuts), centerlock nut assemblies, wheels, and drive pegs. Replace any damaged parts and document all damage with pictures. 3. Inspect the outer surface of the brake disc bell and the inner surface of the wheel that contacts the brake disc bell. If any material transfer or corrosion is present on either surface (Figure 2), gently and thoroughly clean the surface of both parts. Document any material transfer and corrosion with pictures. a. To clean the surfaces, please use special tool VAS 294009 – Wheel Hub Cleaner. i. Only if special tool VAS 294009 is unavailable, 3M Scotch-Brite Hand Pads 7445 (white) and 7448 (light gray) may also be used. 1. Begin by gently cleaning with pad 7445. If pad 7445 does not completely remove all corrosion and material transfer from the surfaces, gently clean the surfaces with pad 7448. 2. Note: Do not use a more abrasive Scotch-Brite pad than pad 7448. Doing so may remove any protective coating from the surfaces of the wheel and brake disc bell. Figure 2 Material Transfer to Brake Disc Bell (Left) from Wheel (Right) b. If a surface cannot successfully be cleaned, replace only the component that cannot be cleaned. i. If no parts are replaced, or if only the wheel is replaced, or if only the brake disc is replaced, continue to Step 4. ii. If both the wheel and brake disc are replaced, skip to Step 6. AfterSales April 9, 2021 Page 2 of 5 Bulletin #: 2106 Advanced Technical Information Part ID: 4405 4. Inspect for material transfer on the contact surfaces between the drive pegs and brake disc (Figure 3). Replace the drive pegs and all drive peg screws if material transfer is present. Document any material transfer with pictures. 5. Check the flatness of the inner wheel surfaces per ATI 4 1503 Clicking Noise From Front PCCB Rotors. Document any unevenness with pictures. 4 Figure 3 Material Transfer on Drive Peg 6. If any anti-corrosion oil is present from manufacturing on any mating surfaces (marked in red with white arrows in Figure 4), on new or old parts, clean the parts with a microfiber cloth and brake parts cleaner. Document presence of anti-corrosion oil with pictures. Figure 4 Mating Surfaces to Check for Anti-Corrosion Oil 7. Thoroughly clean the centerlock nut and apply a complete layer of Optimoly grease to the centerlock cone. Figure 5 Application of Grease to Centerlock Cone AfterSales April 9, 2021 Page 3 of 5 8. 4 Bulletin #: 2106 Advanced Technical Information Part ID: 4405 Thoroughly clean the wheel hub threads and apply a complete layer of Optimoly grease to both the inside threads and the outside diameter. Figure 6 Application of Grease to Wheel Hub 9. If the wheel hubs were replaced, reinstall the wheel hubs and bearings as instructed in WM 405719 – Removing and installing front wheel bearing, section on Installing front wheel bearing. If wheel hubs were not replaced, skip to Step 10. a. Note: If the wheel bearings are damaged during the removal of the wheel hub, the parts must be replaced. 10. Reinstall the PCCB brake discs as instructed in WM 465119 – Removing and installing front PCCB brake disc, section on Installing front brake disc. 11. Reinstall both wheels as instructed in WM 440519 – Removing and installing wheel with central bolt, section on Installing wheel with central bolt. a. Please use recomended special tool QD4RN800A – Torque Wrench from Snap-on for the centerlock wheels. Note: When tightening the centerlock nuts, ensure that the nuts are tightened in one continuous motion. This guarantees that the prescribed tightening torque is achieved. Please see sections 6.1-6.3, within section on Installing wheel with central bolt, for proper tightening procedure and tightening torque values. Figure 7 Proper Centerlock Tightening Motion (Video File) In order to play this video, you need to enable “playing of 3D content” under 3D & Multimedia in the preference settings (Edit) of Adobe Acrobat. AfterSales April 9, 2021 Page 4 of 5 4 Bulletin #: 2106 Advanced Technical Information Part ID: 4405 Warranty As always, be sure to document the repair completely in PQIS. All pictures taken during the repair procedure should be attached to the PQIS job. For this repair, please code the “cause” as follows: Cause location: 4407A Central bolt for wheel mounting Cause symptom: 2015 Clicks Always use the following troubleshooting labor operations: 44052011 2 Wheels remove and reinstall 44073761 Wheel mounting disassemble and assemble 44073762 Wheel mounting disassemble and assemble 44120200 2 Rims check 46510250 2 Front PCCB brake discs check 46512050 2 Front PCCB brake discs remove and reinstall The following troubleshooting labor operations are conditional and should only be used as necessary: 44125501 Rim replace (if only front left replaced) 44125502 Rim replace (if only front right replaced) 44125600 2 Rims replace (if both replaced) 40641955 Front wheel hub remove and reinstall (only if front left replaced) • Also claim 40501905 Wheel bearing housing remove and reinstall from “Preconditions” list 40641956 Front wheel hub remove and reinstall (only if front right replaced) • Also claim 40501906 Wheel bearing housing remove and reinstall from “Preconditions” list 40642055 2 Front wheel hubs remove and reinstall (only if both replaced) • Also claim 40502005 2 Wheel housing bearings remove and reinstall from “Preconditions” list Search Items Wheel clicking, centerlock clicking, 991 wheel clicking, 991, GT3, GT3RS, GT2RS, 911 Turbo, 911 Turbo S Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training courses. They are written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special tools may be necessary in order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the safe operation of your vehicle, and may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and safely. Part numbers listed in these bulletins are for reference only. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a discrepancy, the work procedures in the PIWIS Tester are the ones that must be followed. F12993 ©2021 Porsche Cars North America, Inc. AfterSales April 9, 2021 Page 5 of 5