Remove The Control Chain

NOTIFICATION 

Timing not set correctly 

• Risk of engine damage 
• Rough running engine 
• Loss of engine power 

  → Do not use force when fitting the staking tool.

  → Make sure that the gap is equal on both sides.

  → When inserting the staking tools, do not use force to turn the camshafts against any resistance.

  → The engine must be exactly at top dead centre.

  → The opposite cylinder must be at ignition TDC.

1. > T40263 - Wrench a/f 21  (-2-  ) and > T40314 - adapter  (-1-  ) must be fitted on the crankshaft (-3-  ).

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   Tools on crankshaft

2. Use > T40263 - wrench a/f 21  and > T40314 - adapter  to turn the crankshaft clockwise until the marking on the vibration damper (-1-  ) is positioned at TDC  (-2-  ).

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   TDC marking on vibration damper

3. The markings on the camshaft actuators (cylinder bank 1) -1 and 2-  must be aligned with the reference points -Arrows-  on the camshaft housing. Turn the crankshaft further by one turn if necessary.

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   Markings on camshaft actuator (cylinder bank 1)

4. The markings on the camshaft actuators (cylinder bank 2) -1 and 2-  must be aligned with the reference points -Lines-  on the camshaft housing.

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   Markings on camshaft actuator (cylinder bank 2)

5. Remove stoppers on camshafts (-1-  ).
   1. 5.1  Release and disconnect quick connector (-3-  ).
   2. 5.2  Move vacuum hoses (-4-  ) aside so that the stoppers on the camshafts are accessible.
   3. 5.3  Unscrew screws on stoppers on camshafts (-2-  ).
   4. 5.4  Remove stoppers (-1-  ).

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      Stoppers on camshafts

6. Screw adapter T40331/2  (-1-  ) from tool set > T40331 - clamp camshaft  into the camshaft housing and tighten with 9 Nm ((6.5 ftlb.)  .

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   Adapter on camshaft housing

   Information 

   The camshaft clamp must be easy to insert and must not be fitted using a striking tool. 

7. Fit camshaft clamps > T40331 - camshaft clamp  (-2 to 5-  ).
   1. 7.1 Camshaft clamp 40331/1  (-3-  )

      Right cylinder bank 1:  insert with inscription "A" facing away from the engine.

      Right cylinder bank 2:  Insert with inscription "B" facing away from the engine.

      Turn the crankshaft back and forth slightly to do this, if necessary.

   2. 7.2 Right cylinder bank 1: Secure camshaft clamps T40331/1, T40331/4 and T40331/5  (-3 to 5-  ) using T40331/9  (-2-  ).

      Left cylinder bank 2: Secure camshaft clamps T40331/1, T40331/6 and T40331/5  (-3 to 5-  ) using T40331/9  (-2-  ).

      T40331/9  (-2-  ) must be screwed in by hand. Tighten screws on the camshaft clamps -Arrows-  to 9 Nm (6.5 ftlb.)  .

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      Camshaft clamp

8. Remove left bracket for engine mount -1-  .
   1. 8.1  Unscrew screws -2-  .

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      Bracket for engine mount, left

9. Secure the crankshaft.
   1. 9.1  Unscrew screw plug (-1-  ) from bore (-2-  ).
   2. 9.2  > T40069 - Locking pin  must be screwed into the bore (-2-  ) by hand.

      Turn the crankshaft back and forth slightly to do this, if necessary.

   3. 9.3  Tighten > T40069 - locking pin  to 20 Nm (15 ftlb.)  .

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      Securing crankshaft

10. Fit > VAS 261 001 - ring spanner insert, a/f 41  with > T90001 - counter-hold tool  on the camshaft actuator.

    The > T90001 - counterhold tool  can only be inserted at one position. To do this, the markings (-1 and 2-  ) on the camshaft actuator and chain housing must be aligned.

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    Special tool T90001 on camshaft actuator

11. Release camshaft actuator (-1-  ).
    1. 11.1  Counter the camshaft actuator (-1-  ) using > VAS 261 001 - ring tool attachment, a/f 41  (-2-  ) and > T90001 - counterhold tool  and loosen using > T90000 - socket E24  (-3-  ).

       Do not unscrew the camshaft actuator  (-1-  ) from the camshaft. 

    2. 11.2  Mark camshaft actuators and camshafts for re-installation using a colored marker.

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       Camshaft actuator

12. Lock both chain tensioners.

    Information 

    The chain tensioner piston is oil-damped and can only be pressed back slowly and with constant pressure.

    1. 12.1  Press the chain tensioner piston back fully using a screwdriver.
    2. 12.2  Fix the chain tensioner (-1-  ) in place using > T03006 - locking pin  (-3-  ).

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       Securing the chain tensioner

13. Unscrew control valves and remove camshafts actuators.
14. Remove tensioning rail (-1-  ).
    1. 14.1  Unscrew bearing pin for tension rail (-2-  ).
    2. 14.2  Remove tension rail (-1-  ).

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       Tension rail for cylinder bank 1

15. Remove timing chains together with tension rail.