OVERVIEW
Genuine VW/Audi drivetrain retaining circlip
7P0-521-200-A is the individual retaining ring used at its assigned drivetrain assembly location. The confirmed applications below identify the assigned 0BU transfer-case retaining-ring arrangement on Touareg models and the specified 0CP front bevel-box circlip location on RS3 and TT RS models.
A circlip provides mechanical retention at the specified groove. It does not perform the sealing function of an O-ring or radial shaft seal. Select those components separately when the service procedure calls for them.
Technical details and supplied quantity
- Manufacturer part number: 7P0-521-200-A; compact reference 7P0521200A.
- Brand: Genuine VW/Audi.
- Component: retaining circlip / snap ring.
- Nominal catalog specification at the confirmed transfer-case point: 21.9 × 1.8 mm.
- Quantity: one individual retaining ring per purchase.
Use the exact part assignment for the shaft and groove being serviced. Other retaining rings in a drivetrain can look similar while having different specifications. The original drivetrain assembly code and retaining-ring location take precedence over a general vehicle-model match.
Common reasons to replace
- The original ring is distorted during removal.
- The ring is missing or damaged during an assembly repair.
- Inspection finds damage that prevents correct engagement in the assigned groove.
- The applicable factory service procedure calls for a replacement retaining ring.
Inspect the retained component and groove before fitting the new ring. A damaged groove or incorrectly assembled shaft cannot be repaired by substituting a circlip. Resolve the underlying assembly problem and use the prescribed service parts.
Vehicle fitment
These entries cover the specified transfer-case and front bevel-box applications. Confirm the assembly code and original retaining-ring location before ordering.
| Vehicle | Model years | Engine | Configuration | Application restrictions |
|---|---|---|---|---|
| Volkswagen Touareg | 2011–2017 | 3.6L FSI gasoline VR6 | 7P SUV; 4Motion; Original 8-speed automatic drivetrain with the assigned 0BU transfer case | Only the transfer-case retaining-ring location assigned 7P0521200A. Match transfer-case code, shaft/groove and exact original ring. This row does not establish compatibility with every final-drive or rear-axle ring location. One circlip supplied; seals, O-rings, shafts and protective rings are separate. |
| Volkswagen Touareg | 2011–2016 | 3.0L TDI diesel V6; CATA or CNRB where assigned | 7P SUV; 4Motion; Original 8-speed automatic drivetrain with the assigned 0BU transfer case | Only the transfer-case retaining-ring location assigned 7P0521200A. Match transfer-case code, shaft/groove and exact original ring. This row does not establish compatibility with every final-drive or rear-axle ring location. One circlip supplied; seals, O-rings, shafts and protective rings are separate. |
| Volkswagen Touareg | 2011–2015 | 3.0L supercharged gasoline V6 hybrid; CGEA or CGFA where assigned | 7P SUV; 4Motion; Original 8-speed automatic drivetrain with the assigned 0BU transfer case | Only the transfer-case retaining-ring location assigned 7P0521200A. Match transfer-case code, shaft/groove and exact original ring. This row does not establish compatibility with every final-drive or rear-axle ring location. One circlip supplied; seals, O-rings, shafts and protective rings are separate. |
| Audi RS3 | 2017–2020 | 2.5L turbocharged gasoline inline-five | 8V sedan; quattro; Seven-speed S tronic; assigned 0CP front bevel-box assembly | Circlip at position 28 in the matched 0CP front bevel-box assembly, adjacent to the specified seal and cover. Match installed gearbox identification and original 7P0521200A assignment. Not every shaft retaining ring; excludes other transmission and differential locations. |
| Audi TT RS | 2018–2022 | 2.5L turbocharged gasoline inline-five | 8S Coupe; quattro; Seven-speed S tronic; assigned 0CP front bevel-box assembly | Circlip at position 28 in the matched 0CP front bevel-box assembly, adjacent to the specified seal and cover. Match installed gearbox identification and original 7P0521200A assignment. Not every shaft retaining ring; excludes other transmission and differential locations. |
Installation and service guidance
Follow the factory procedure for access to the affected transfer-case or front bevel-box component. Keep the working area clean and handle the ring with the tool and technique prescribed for its design. Avoid overstretching or permanently distorting the retaining ring during installation.
Seat the ring completely in its assigned groove and inspect its engagement around the circumference. Confirm the position and retention of the mating component as directed by the service procedure before closing the assembly.
Replace separately required seals and other service components according to the applicable repair instructions. Restore any disturbed fluid or assembly settings to the specified requirements and perform the prescribed final checks.