Removing Timing Chain

NOTIFICATION 

Timing not set correctly 

• Risk of engine damage 
• Rough running engine 
• Loss of engine power 
  1. → Do not use force when fitting the staking tool.
  2. → Make sure that the gap is equal on both sides.
  3. → When inserting the staking tools, do not use force to turn the camshafts against any resistance.
  4. → The engine must be exactly at top dead centre.
  5. → The opposite cylinder must be at ignition TDC.

Information 

An offset from one tooth indicates a deviation from the setpoint value of approx. 6 mm.

If an offset is detected, the timing chain must be re-fitted.

1. Remove bearing saddle -1-  .
   1. 1.1  Unscrew screws -2-  .
   2. 1.2  Carefully loosen and remove the bearing saddle -1-  .

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   Bearing saddle

   Information 

   Unless otherwise specified, the engine must not be turned against the running direction of the engine. 

2. Turn the crankshaft as far as required using a suitable tool until the markings -Arrows-  on the camshaft timing gears are facing upwards.

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   Markings on camshaft timing gears

   Information 

   Once maximum pointer deflection is reached, the piston is at top dead centre (TDC). 

3. Move cylinder 1 to TDC position.
   1. 3.1  Prepare VAS 6079 - Dial gauge-2-  .
      1. 3.1.1 T10170A - Dial gauge adapter-1-  must be screwed fully into the spark plug bore of cylinder 1.
      2. 3.1.2  Insert VAS 6079 - dial gauge-2-  into T10170A - dial gauge adapter-1-  and clamp securely with a clamping nut.
   2. 3.2  Turn the engine slowly in direction of rotation of the engine until maximum deflection of the pointer on the VAS 6079 - dial gauge-2-  is reached.

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   Dial gauge on cylinder 1

4. Tighten the chain tensioner.
   1. 4.1  Unscrew screws -arrows A-  .
   2. 4.2  Insert T40243 - lever-1-  and secure with screws -arrows A-  .
      1. 4.2.1  Replace screws.
   3. 4.3  Press and hold the circlip -2-  on the chain tensioner.
   4. 4.4  Press T40243 - lever-1-  slowly in -direction of arrow B-  and hold securely.

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   Special tool for chain tensioner

5. Lock chain tensioner -1-  using T40267 - staking tool-2-  .

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   Locking chain tensioner

6. T40243 - Lever-1-  must now be removed.
   1. 6.1  Unscrew screws -arrows A-  .
   2. 6.2  Remove T40243 - lever-1-  .
   3. 6.3  Screw in and tighten new  screws -arrows A-  .

      Initial tightening 4 Nm (3 ftlb.) 

      Final tightening +90° 

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   Special tool for chain tensioner

7. Remove upper guide rail -1-  .
   1. 7.1  Release catch on upper guide rail -1-  .
   2. 7.2  Pull upper guide rail -1-  forward and remove it.

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   Upper guide rail

8. Remove chain tensioner for oil pump -1-  .
   1. 8.1  Press clamp in -direction of arrow-  and lock it using T40011 - locking pin-3-  .
   2. 8.2  Unscrew guide pin -2-  and remove oil pump chain tensioner -1-  .

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   Chain tensioner for oil pump

9. Loosen the guide and tensioning rail.
   1. 9.1  Remove guide rail -1-  .
      1. 9.1.1  Unscrew guide pins -3-  .
      2. 9.1.2  Guide side guide rail -1-  down and out.
   2. 9.2  Loosen tensioning rail -2-  .
      1. 9.2.1  Unscrew guide pins -4-  .
      2. 9.2.2  Guide tensioning rail -2-  downwards and leave it at this position.

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   Guide and tensioning rail

10. Remove camshaft timing chain.