Overview - Camshaft Timing Chains, Engine Codes CXBA, CNSA, CXBB And CNSB

Fig 1: Camshaft Timing Chain Overview

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1. Bolt
   • 4 Nm +90°
   • 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 specification and sequence. Refer to Fig 4.
   • Replace after removing.
6. Control Valve
   • 35 Nm
   • Left-hand thread
   • Depending on the version, remove using the Assembly Tool: T10352/2  or Assembly Tool: T10352/4  .
   • Checking. Refer to Fig 2.
7. Bolt

   M 6 bolt

   • 8 Nm +90°

     M8 Bolt:

   • 20 Nm + 90°
   • Replace after removing.
8. Washer
9. Bearing Bracket
   • Depending on the version with adapter sleeve. Refer to the Parts Information for the allocation.
   • Tightening specification and sequence. Refer to Fig 4.
   • Assembly instructions. Refer to Fig 3.
10. Camshaft Timing Chain Guide Rail
11. Camshaft Housing
12. Camshaft Timing Chain
    • Before removing, mark the running direction with paint
    • Removing and Installing. Refer to CAMSHAFT TIMING CHAIN, REMOVING AND INSTALLING .
13. Camshaft Timing Chain Guide Rail
14. Guide Pin
    • 20 Nm
15. Three Stage Chain Sprocket
    • Crankshaft
    • Installation position. Refer to Fig 5.

Checking the Control Valve 

Fig 2: 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.

Bearing Bracket - Assembly Instructions 

Fig 3: Bearing Bracket - Assembly Instructions

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If a new bearing bracket -3- with adapter sleeve -4- should be installed, it must be checked before installing the bearing bracket in the hole -arrow- in the cylinder head -1-.

If the hole -arrow- is not designed for using the adapter sleeve -4- the adapter sleeve must be removed from the bearing bracket. For this hole the short bolt -2- should be used. Refer to the Parts Information for the correct bolt.

Bearing Bracket - Tightening Specifications and Sequence 

Fig 4: Bearing Bracket - Tightening Sequence

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If an adapter sleeve is installed, this will be moved with the bolt -1- in the cylinder head.

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

Bearing Bracket with Adapter Sleeve and Steel Bolts

Bearing Bracket without Adapter Sleeve and Aluminum Bolts

Three Stage Chain Sprocket - Installed Position 

Fig 5: Chain Sprocket Crankshaft

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

• Both surfaces -arrows- must align.