Overview - Camshaft Timing Chain, Engine With Two Camshaft Adjusters

• 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: Camshaft Timing Chains Exploded View

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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 4.
   • Aluminum bolt: Always replace after removal
6. Adapter Sleeve
   • Depending on the version, not present on every bearing bracket
7. Control Valves
   • 35 Nm
   • Left-hand thread
   • Different versions depending on the version.
   • Checking using the Vehicle Diagnostic Tester. Refer to Fig 2.
8. Bearing Bracket
   • Assembly instructions. Refer to Fig 3.
   • Removing and installing. Refer to BEARING BRACKET, REMOVING AND INSTALLING, ENGINE WITH TWO CAMSHAFT ADJUSTERS .
9. Camshaft Timing Chain Guide Rail
10. Camshaft Housing
11. Camshaft Timing Chain
    • Before removing, mark the running direction with paint
    • Removing and Installing. Refer to CAMSHAFT TIMING CHAIN, REMOVING AND INSTALLING, ENGINE WITH TWO CAMSHAFT ADJUSTERS .
12. Camshaft Timing Chain Guide Rail
13. Guide Pin
    • 20 Nm
14. 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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-- Tighten the bolts in the steps shown in the sequence:

For Steel Bolts 

For Aluminum Bolts 

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

Three Stage Chain Sprocket - Installed Position 

Fig 5: Chain Sprocket Crankshaft

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• Both surfaces -arrows- must align.