Overview - Camshaft Timing Chains

Fig 1: Exploded View Of Camshaft Timing Chains

Courtesy of AUDI OF AMERICA, LLC

1. Tensioning Rail
   • For the camshaft timing chain
2. Bolt
   • 9 Nm
3. Chain Tensioner
   • is under tension
   • Secure with the Locking Tool: T40435  before removing
4. Guide Pin
   • 20 Nm
5. Bolt
   • Tightening sequence. Refer to Fig 2.
   • Replace after removing
6. Adapter Sleeve
7. O-Ring
   • Replace after removing
   • Installed depending on the performance class
   • Lubricate with engine oil
8. Control Valve
   • 35 Nm
   • Left-hand thread
   • Check using the Vehicle Diagnostic Tester. Refer to Fig 4.
9. O-Ring
   • Replace after removing
   • Installed depending on the performance class
   • Lubricate with engine oil
10. Bearing Bracket
    • Removing and Installing. Refer to BEARING BRACKET, REMOVING AND INSTALLING .
11. Guide Rail
    • For the camshaft timing chain
12. Cylinder Head Cover
13. Camshaft Timing Chain
    • Mark the running direction with paint for reinstallation
    • Removing and Installing. Refer to CAMSHAFT TIMING CHAIN, REMOVING AND INSTALLING .
    • After working on the chain drive, the adaptation must be performed using the Vehicle Diagnostic Tester. Refer to PERFORM ADAPTATIONS AFTER COMPONENT REPLACEMENT .
14. Guide Rail
    • For the camshaft timing chain
15. Guide Pin
    • 20 Nm
16. Three Stage Chain Sprocket
    • Installation position. Refer to Fig 3.

Bearing Bracket - Tightening Specifications and Sequence 

Fig 2: Bearing Bracket Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

-- Tighten the bolts -1 to 6- in steps in the sequence shown:

Three Stage Chain Sprocket - Installed Position 

Fig 3: Chain Sprocket Crankshaft

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• Both surfaces -arrows- must align.

Checking the Control Valve 

Fig 4: Checking The Control Valve

Courtesy of AUDI OF AMERICA, LLC

• The piston -1- must be pushed in approximately 3 mm against the spring force. It must not become stuck while doing so.