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Timing Chain: Service and Repair







Components of chain drive system, removing and installing

Note:
^ Cylinder bank 1 is located on the right-hand side when looking toward the front.
^ Cylinder bank 2 is located on left-hand side when looking toward the front.

1. Control housing
^ Cylinder bank 2
^ Lightly lubricate contact surfaces of oil seals before installing
^ Removing and installing, Refer to Camshaft, Engine, Service and Repair
^ Disassembling and assembling, Refer to Intake/ Exhaust, Service and Repair, Valve gear (Cylinder banks 1 and 2), Servicing, See Fig 8
2. 8 Nm
3. Pivot pin, 18 Nm
^ For tensioning plate item 4
4. Tensioning plate
^ For camshaft roller chain item 35
5. 20 Nm
6. Pivot pin, 18 Nm
^ For guide rail item 7
7. Guide rail
^ For camshaft roller chain item 12
8. Control housing
^ Cylinder bank 1
^ Lightly lubricate contact surfaces of oil seals before installing
^ Removing and installing, Refer to Camshaft, engine, Service and Repair
^ Disassembling and assembling, Refer to Intake/Exhaust, Service and Repair, Valve Gear (Cylinder banks 1 and 2) Servicing
9. Exhaust camshaft adjuster
^ Cylinder bank 1
^ Identification: B 1 and AS
^ Observe installation position to camshaft roller chain
^ Rotate engine only when camshaft adjuster is installed
^ Installing,Adjusting valve timing, Refer to Intake/Exhaust, Adjustments
10. 60 Nm - 1/4 turn (90°) further
^ Replace
^ Contact surface of sender wheel must be dry around bolt head when assembled
^ To remove and install, counter-hold with 32 mm open jaw wrench on camshaft, Refer to Camshaft, Engine, Service and Repair
11. Intake camshaft adjuster
^ Cylinder bank 1
^ Identification: B1 and E7
^ Observe installation position to camshaft roller chain
^ Rotate engine only when camshaft adjuster is installed
^ Installing, Adjusting valve timing, Refer to Intake/Exhaust, Adjustments
12. Camshaft roller chain
^ Cylinder bank 1
^ Mark direction of rotation before removing (installation position) - -
^ Observe installation position to camshaft adjusters
^ Installing,. Adjusting valve timing, Refer to Intake/Exhaust Valve, Adjustments
13. Pivot pin, 12 Nm
^ For tensioning rail item 14
14. Tensioning rail
^ For camshaft roller chain item 12
15. Seal
^ Replace if damaged or leaking
16. Chain tensioner, 40 Nm
^ For camshaft roller chain item 12
^ Only rotate engine when chain tensioner is installed
17. 60 Nm - 1/4 turn (90°) further
^ Replace
^ Counter-hold with T10069 to loosen and tighten, Adjusting timing, Refer to Intake/Exhaust, Valve, Adjustment
18. Sprocket
^ For camshaft roller chain items 12 and 35
^ Installing, Adjusting timing, Refer to Intake/Exhaust, Valve, Adjustment
19. Chain tensioner with tensioning plate
^ For roller chain item 23
^ Lock chain tensioner with drill bit (diameter: 3.5 mm)
^ Only rotate engine with chain tensioner installed
20. Securing plate
21. Sprocket
^ For roller chain item 23
^ Installing, Adjusting timing, Refer to Intake/Exhaust, Valve, Adjustment
22. Crankshaft sprocket
^ Integral part of crankshaft
23. Roller chain
^ Mark direction of rotation before removing (installation position)
^ Installing, Adjusting timing, Refer to Intake/Exhaust, Valve, Adjustment
24. Guide rail
^ For roller chain item 23
25. Locating pin without collar, 10 Nm
^ For guide rail item 24
26. 10 Nm
^ Insert with locking fluid D 000 600 A2
27. Intermediate shaft
28. Guide rail
^ For camshaft roller chain item 35
29. Pivot pin, 10 Nm
^ For guide rail, item 28
30. 9 Nm
31. Chain tensioner
^ For camshaft roller chain item 35
^ Lock chain tensioner with drill bit (diameter: 3.5 mm)
^ Only rotate engine with chain tensioner installed
32. Stop plate
^ For chain tensioner, item 31
33. Exhaust camshaft adjuster
^ Cylinder bank 2
^ Identification: B2 and AS
^ Observe installation position to camshaft roller chain
^ Rotate engine only when camshaft adjuster is installed
^ Installing, Adjusting timing, Refer to Intake/Exhaust, Valve, Adjustment
34. Intake camshaft adjuster
^ Cylinder bank 2
^ Identification: B2 and E7
^ Observe installation position to camshaft roller chain
^ Rotate engine only when camshaft adjuster is installed
^ Installing, Adjusting timing, Refer to Intake/Exhaust, Valve, Adjustment
35. Camshaft roller chain
^ Cylinder bank 2
^ Mark direction of rotation before removing (installation position)
^ Observe installation position to camshaft adjusters
^ Installing, Adjusting timing, Refer to Intake/Exhaust, Valve, Adjustment





Fig. 1 Marking roller chains
^ Mark roller chains before removing (e.g. with paint, arrow pointing in direction of rotation).

Note: Do not mark chain with a center punch or any similar means!





Fig. 2 Installation position: Intake camshaft adjuster to cylinder bank 1 camshaft roller chain
The copper link of the camshaft roller chain (arrow) must align with arrow -1- on camshaft timing adjuster.





Fig. 3 Installation position: Exhaust camshaft adjuster to cylinder bank 1 camshaft roller chain
The copper link of the camshaft roller chain (arrow) must align with arrow -1- on camshaft timing adjuster.





Fig. 4 Installation position: Intake camshaft adjuster to cylinder bank 2 camshaft adjuster roller chain
The copper link of the camshaft roller chain (arrow) must align with arrow -1- on camshaft timing adjuster.





Fig. 5 Installation position: Exhaust camshaft adjuster to cylinder bank 2 camshaft roller chain
The copper link of the camshaft roller chain (arrow) must align with arrow -1- on camshaft timing adjuster.
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