Overview - Camshaft Timing Chain, Engine Codes CHHB, CNTA, CXCA, CXDA, CXCB, CXDB And DKFA

Fig 1: Camshaft Timing Chains Exploded View

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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 for bearing bracket with steel bolts. Refer to Fig 4.
   • Tightening specification and sequence for bearing bracket with aluminum bolts. Refer to Fig 5.
   • Replace after removing.
6. Adapter Sleeve
   • Depending on the version, not present on every bearing bracket
   • Pulled into the cylinder head with the bolt
7. Control Valves
   • 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.
8. Bearing Bracket
   • Tightening specification and sequence for bearing bracket with steel bolts. Refer to Fig 4.
   • Tightening specification and sequence for bearing bracket with aluminum bolts. Refer to Fig 5.
   • Assembly instructions. Refer to Fig 3.
   • Depending on the version with adapter sleeve. Refer to the Parts Information for the allocation.
9. Camshaft Timing Chain Guide Rail
10. Camshaft Housing
11. Camshaft Timing Chain
    • Removing and Installing. Refer to CAMSHAFT TIMING CHAIN, REMOVING AND INSTALLING .
    • Before removing, mark the running direction with paint
12. Camshaft Timing Chain Guide Rail
13. Guide Pin
    • 20 Nm
14. Three Stage Chain Sprocket
    • Crankshaft
    • Installation position. Refer to Fig 6.

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.

Tightening Specification and Sequence for Bearing Bracket with Steel Bolts 

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:

Tightening Specification and Sequence for Bearing Bracket with Aluminum Bolts 

Fig 5: Bearing Bracket - Tightening Sequence

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-- Tighten the bolts in the shown sequence -1 to 6- in steps:

Three Stage Chain Sprocket - Installed Position 

Fig 6: Chain Sprocket Crankshaft

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• Both surfaces -arrows- must align.