GeorgeAdel

Hello, I am writing to urgently request your specialized engineering guidance regarding a highly unusual and critically severe mechanical seizure on a 2009 Škoda Fabia Combi Mk2 (1.6L Gasoline BTS Engine, 6-Speed Automatic Tiptronic Transmission - Aisin 09G). • Component in Question: Right-Side (Long) Inner CV Joint Cup (Transmission Side) The Problem: While attempting to replace the right front drive shaft, the inner CV joint separated, leaving the inner CV joint cup (stub axle portion) completely seized inside the differential housing. The internal circlip (snap ring) appears to have experienced a severe mechanical binding/jamming or deformation inside the differential splines, creating a total mechanical lock. Chronology of Failed Removal Attempts: We have strictly followed all standard automotive repair protocols, followed by heavy-duty industrial extraction methods, but the cup remains completely immovable. The following attempts have been made: 1. Standard & Specialized Pry Bars: We used dual pry bars and dedicated CV axle popper forks to apply balanced, opposing outward leverage. The cup did not budge. 2. Heavy-Duty Slide Hammer & Vice Grips: A professional slide hammer was securely locked onto the cup's ridge. Repeated high-impact blows failed to release the circlip. 3. Opposite Side Punching (Attempted): We completely removed the left-side (short) healthy axle to drive the seized cup out from the inside. However, this specific differential design features a center pin/plug (blind differential) preventing a straight punch from passing through to the back of the right cup. 4. Drilling & Pin Insertion: We successfully drilled two opposing holes through the heavy metal walls of the cup, inserted a thick, high-tensile steel bolt through it, and attached heavy-duty locking pliers linked to a slide hammer. The impact shattered the pliers, but the cup did not move. 5. Arc/CO2 Welding & Industrial Chain Pulling: We welded a massive high-tensile bolt directly into the inner cavity of the cup to achieve structural integration. We hooked it to an industrial iron chain and applied extreme hydraulic/mechanical pulling force. The force was so immense that the heavy-duty iron chain snapped completely, yet the CV cup did not move even a millimeter. Current Dilemma: The inner CV cup and the differential splines are now acting as a single, permanently welded mechanical unit due to the internal circlip jam. We have stopped applying further external pulling force to prevent cracking the aluminum transmission casing or destroying the internal differential bearings. We also want to avoid dropping the entire transmission if an on-car engineering solution exists. Given your deep manufacturing and engineering expertise with the Aisin 09G / VAG differential assembly, could you please provide us with: 1. The official factory service protocol for a totally seized internal circlip on this specific transmission. 2. Any specialized VAG dealer tool designed for this exact type of catastrophic seizure. 3. Your technical recommendation on whether splitting the cup longitudinally (on-car) is safe, or if dropping the gearbox is now mandatory to dismantle the differential. Thank you for your prompt attention to this highly challenging technical issue. I look forward to your expert guidance.