Securing Chain Housing Cover

Information 

The > 9768 - electronic torque wrench, 2 - 100 Nm (1.5 - 74 ftlb.) must be used when tightening the chain housing cover.

The following parameters must be monitored for the M6 aluminum screws:

• Torque limits: > Lower torque limit 5.2 Nm (3.8 ftlb.) > Upper torque limit 9 Nm (6.6 ftlb.)
• Rotation angle window: > Minimum torque angle + 50° > Maximum torque angle + 95°

Example 1: The maximum torque of 9 Nm (6.5 ftlb.) is reached. The minimum torque angle is not below the 50° limit --> Installation is OK.

Example 2: The maximum torque angle of 95° is reached. The minimum torque does not fall below the 5.2 Nm (3.8 ftlb.) limit -> Installation is OK.

If the limits are exceeded when screwing in screws, the relevant screw must be replaced.

Information 

In case of repair, two aluminum screws must be changed to steel screws -15 and 30-  with aluminum washers -Arrows-  .

> Refer to the appropriate service information

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Steel screw with aluminum washer

Information 

The tightening specifications for the basic engine are stored centrally.

> 1X00IN TECHNICAL VALUES

/

> 2X00IN TECHNICAL VALUES

or

> 1001IN TIGHTENING TORQUES, TIGHTENING SEQUENCES AND ASSEMBLY OVERVIEWS .

Tightening torques and assembly instructions for other assemblies (e.g. chassis, electrics, transmission or body) or for peripheral engine equipment can be found in the corresponding documents.

1. Tighten the fastening screws to the relevant parameters in the sequence shown. >
   Fig 1: Chain Housing Cover Components Location With Torque Specifcation

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   Tightening specifications for chain housing cover

   1-30	Tightening sequence
   1-4	Aluminium screw M6 x 55
   5 + 6	Aluminium screw M8 x 55
   7-12	Aluminium screw M6 x 30
   13 + 14	Aluminium screw M6 x 55
   15	Steel screw M6 x 30 with aluminum washer 6.4 x 14 x 3 mm
   16-28	Aluminium screw M6 x 30
   29	Aluminium screw M6 x 55
   30	Steel screw M6 x 30 with aluminum washer 6.4 x 14 x 3 mm
   1-4 + 7-14, 16-29	> Initial tightening 4 Nm (3 ftlb.) > Final tightening + 90°
   5 + 6	> Initial tightening 10 Nm (7.4 ftlb.) > Final tightening + 90°
   15 + 30	> Tightening torque 10 Nm (7.4 ftlb.)
   Carry out further assembly work =>

2. Secure cable duct at the front right.
   1. 2.1 Route cable duct on the chain housing cover and fit the screw.

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      Securing cable duct

3. Clip vacuum lines on cable duct -Arrows-  .

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   Clipping in vacuum lines at the cable duct

4. Fit belt tensioner and deflection rollers on the chain housing cover. Also fit screws and cover. > Belt drive 
   Fig 2: Belt Drive Components Location

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   Belt drive

   1	Deflection roller
   2	Hydraulic belt tensioner; tensioner to lever, tensioning roller to tensioning lever
   3	Screw, M8 x 96; complete lever on chain housing cover and cylinder head; belt tensioner and chain housing cover at the console
   4	Deflection roller
   5	Dual poly-V-belt

5. On turbo engines, fit positive crankcase ventilation completely in front of the chain housing cover > One-way couplings for ventilation on turbo engines  .
   Fig 3: One-Way Couplings For Ventilation On Turbo Engines Components Location

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   One-way couplings for ventilation on turbo engines

   1	Turbocharger
   2	Check valve on vent line for oil mist separator and intake-air distributor
   3	Full-throttle ventilation one-way coupling => Cannot be refitted. When mounting for the first time, ensure that the markings are in the correct position relative to each other.
   4	Full-throttle ventilation one-way coupling to intake manifold => Cannot be refitted. When mounting for the first time, ensure that the markings are in the correct position relative to each other.