Overview - Camshaft Timing Chain, Engine With Two Camshaft Adjusters

Fig 1: Exploded View Of Camshaft Timing Chain (Engine With Two Camshaft Adjusters)

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1. Bolt
   • 4 Nm + 90°
   • Always 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 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 .
    • After procedures on the chain drive perform the adaptation using the Vehicle Diagnostic Tester
12. Camshaft Timing Chain Guide Rail
13. Guide Pin
    • 20 Nm
14. Three Stage Chain Sprocket
    • Crankshaft
    • Installation position. Refer to Fig 5.

Fig 2: View Of Control Valve

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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.

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.

Fig 5: Chain Sprocket To Crankshaft Installation Position

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• Both surfaces -arrows- must align.