Renewing gasket between biturbo turbine housings: Audi 2.0 TDI (CKUB, CKUC, CFCA, CSNA)

🧭 Before you start

Fits: platform codes S1, 2H

• Renewed: seals, studs as required

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• Remove outer nut (3) on the regulating rod (1), break open the sealing paint and then unscrew the nut from regulating rod. Do not turn inner nut (2)!
• When pulling the connecting pipes apart, ATE brake cylinder paste ETKA (Electronic Parts Catalogue) can be used as a »lubricant«.
• Mark position of V-band clamp, and loosen bolt (1) of V-band clamp.
• In case of a V-band clamp, make sure it is seated correctly at the position marked during removal.

🔧 Engine codes this applies to

📐 25 workshop diagrams for CKUB

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Carefully release locking plate (5) on regulating rod (1) of vacuum unit with regulating flap potentiometer G584 from the bolts with sealing paint (4) using a screwdriver or similar, and remove the locking plate.
2. Remove outer nut (3) on the regulating rod (1), break open the sealing paint and then unscrew the nut from regulating rod. Do not turn inner nut (2)!
3. Unscrew the three hexagon socket head bolts (2) at the compressor inlet. Then, carefully pull off connecting pipe (1). [Note: When pulling the connecting pipes apart, ATE brake cylinder paste Electronic Parts Catalogue can be used as a »lubricant«.]
4. Mark position of V-band clamp, and loosen bolt (1) of V-band clamp.
5. Unscrew the three bolts (1) on flange near compressor bypass valve.

6. Unscrew nuts (1) on flange between stages.
7. Carefully pull apart the two components (A) and (B). When pulling apart, pay particular attention to bypass valve (arrow). [Note: Renew seals, gaskets and self-locking nuts.Check thoroughly whether all sealing plugs have been removed.Clean sealing surfaces.Renew studs as required.Always screw in lines initially, and then tighten them to specified torque.When fitting the connecting pipes, ATE brake cylinder paste Electronic Parts Catalogue can be used as a »lubricant«.Reapply sealing paint to all positions where it was damaged during removal.When assembling turbochargers, it is essential that the correct repair kit Electronic Parts Catalogue is used.] [Note: Use a commercially available stud extractor to remove studs from flange.Note the installation location of the studs.]
8. ⚠ When pulling both turbocharger stages apart, ensure that no pressure is exerted on the linkage or the vacuum units.When carrying the turbocharger, always hold it by the pipes and not by the vacuum units or the linkage.Bent linkage will impair the function of the turbocharger. Loading/stressing the vacuum units can damage them. — First, fit component (A) to manifold. Then, carefully guide section (B) towards component (A), and secure it with V-band clamp or three bolts, depending on the respective version.
9. In case of a V-band clamp, make sure it is seated correctly at the position marked during removal.
10. Secure both turbocharger stages by tightening self-locking nuts (1) from repair kit Electronic Parts Catalogue to specified torque in specified sequence.
11. Carefully fit connecting pipe (1), and start the 3 bolts (2). Then, tighten them to specified torque.

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