Installing Vibration Balancer (Crankshaft Pulley)

Information 

• A feather key is inserted into the crankshaft. When fitting the vibration balancer, make sure that the feather key slots into the groove in the vibration balancer. 
• The feather key must not fall into the engine. 

1. Install the vibration balancer.
   1. 1.1. Fit the vibration balancer at the crankshaft stub and press it on firmly.
   2. 1.2. The feather key -arrow-  must secure the vibration balancer.
   3. 1.2.1. If necessary, turn the vibration balancer back and forth -arrows-  until it is seated correctly on the crankshaft journal.
      Fig 1: Locating Feather Key

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      Fig 2: Fitting Vibration Balancer

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2. Always replace the hexagon-head bolt.
   Fig 3: Tightening Hexagon-Head Bolt

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3. Block the vibration balancer using a brace and tighten the hexagon-head bolt (a/f 27) to the specified torque. → Initial tightening: 100 Nm (74 ft lbs.)  → Torque angle: 180° 
   1. 3.1. Apply markings in order to get the exact torque angle.
      Fig 4: Turning Hexagon-Head Bolt

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      1. Start marking
      2. Marking on hexagon-head bolt
      3. End marking
   2. 3.2. Apply marking -2-  on the hexagon-head bolt exactly opposite the marking -1-  on the vibration balancer.
   3. 3.3. Turn the hexagon-head bolt 180 ° until the marking -2-  is exactly opposite the marking -3-  .