Overview - Camshaft Timing Chain, Engine With One Camshaft Adjuster

• After removing or replacing the chain drive components the adaptation values for the chain length must be adapted again. Use the Vehicle Diagnostic Tester 01 - Engine electronics, functions  , 01 - Chain length diagnostic adaptation  .

Fig 1: Exploded View Of Camshaft Timing Chain (Engine With One Camshaft Adjuster)

Courtesy of AUDI OF AMERICA, LLC

1. Bolt
   • For aluminum bolts: 4 Nm +90°
   • For steel bolts: 9 Nm
   • Replace after removing.
2. Chain Tensioner
   • Is under tension
   • Secure using the Locking Tool: T40267  before removing
3. Timing Chain Tensioning Rail
4. Guide Pin
   • 20 Nm
5. Bolt
   • Tightening Specifications and Sequence. Refer to Fig 2.
   • Aluminum bolt: Always replace after removal
6. Adapter Sleeve
   • Depending on the version, not present on every bearing bracket
7. Control Valve
   • 35 Nm
   • Left-hand thread
   • Different versions depending on the version.
   • Checking. Refer to Figure.
8. Bolt
   • Tightening Specifications and Sequence. Refer to Fig 2.
   • Always replace after removing
9. Washer
10. Bearing Bracket
    • Assembly instructions. Refer to Figure.
    • Removing and Installing. Refer to BEARING BRACKET, REMOVING AND INSTALLING, ENGINE WITH ONE CAMSHAFT ADJUSTER .
11. Camshaft Timing Chain Guide Rail
12. Camshaft Housing
13. Camshaft Timing Chain
    • Before removing, mark the running direction with paint
    • Removing and Installing. Refer to CAMSHAFT TIMING CHAIN, REMOVING AND INSTALLING, ENGINE WITH ONE CAMSHAFT ADJUSTER .
14. Camshaft Timing Chain Guide Rail
15. Guide Pin
    • 20 Nm
16. Three Stage Chain Sprocket
    • Crankshaft
    • Installation position. Refer to Figure.

Bearing Bracket - Tightening Specifications and Sequence 

Fig 2: Bearing Bracket - Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

-- Tighten the bolts in the steps shown in the sequence:

For Steel Bolts 

• Replace the bolts that were tightened with an additional turn after removing them.

For Aluminum Bolts 

• Replace the bolts that were tightened with an additional turn after removing them.