Overview - Camshaft Timing Chains

Fig 1: Camshaft Timing Chains Exploded View

Courtesy of AUDI OF AMERICA, LLC

1. Chain Tensioner
   • is under tension
   • Secure with the Tensioner Locking Tool:T40267  before removing
2. Bolt
   • 9 Nm
3. Guide Pin
   • 20 Nm
4. Bolt
   • Replace after removing
   • Tightening sequence. Refer to Fig 2.
5. Adapter Sleeve
   • Depending on the version, not present on every bearing bracket
6. Control Valve
   • Left-hand thread
   • 35 Nm
7. Control Valve
   • Left-hand thread
   • 35 Nm
8. Bearing Bracket
   • Removing and Installing. Refer to BEARING BRACKET, REMOVING AND INSTALLING .
9. Cylinder Head Cover
10. Bolt
    • 9 Nm
11. Guide Rail
    • For the camshaft timing chain
12. 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 .
13. Guide Rail
    • For the camshaft timing chain
14. Guide Pin
    • 20 Nm
15. Three Stage Chain Sprocket
    • Installation position. Refer to Fig 3.
16. Tensioning Rail
    • For the camshaft timing chain

Bearing Bracket - Tightening Specifications and Sequence

Fig 2: Bearing Bracket Tightening Sequence

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-- 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

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