Installing Pulley (Vibration Balancer)

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Position vibration damper onto the crankshaft stub.
1. 1.1. Press the vibration damper slightly towards the engine, while at the same time turning it until it slips towards the timing-case cover.
  Information
  - A feather key is inserted into the crankshaft. When fitting the vibration damper (crankshaft pulley), ensure that the feather key slots into the groove .
  - The key must not fall into the engine .
  - Vibration damper (crankshaft pulley) and crankshaft stub must be cleaned .
2. 1.2. When doing so, be careful of the feather key. → Pulley on crankshaft stub
  
  Fig 1: Positioning Vibration Damper Onto Crankshaft Stub
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Fit the New central screw -arrow- hand-tight.

Fig 2: Locating Crankshaft Central Screw
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Counter-Hold Tool 9679/3 with the rectangular tube from Holding Wrench 9732 must be inserted into the vibration damper and turned until it locks.
Information

Protect the radiator fins using cardboard or a sheetmetal panel to prevent damage.

Cover wing and peripheral parts to protect them.
1. 3.1. Get another worker to use the counter-hold tool
  
  Fig 3: Identifying Vibration Damper Tool
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Using a torque wrench and a suitable socket, tighten the central screw → see Fig 4 and only carry out step-by-step Torque Tightening . Tightening Torque 20 Nm (15 ft. lb.) Tightening Torque 50 Nm (37 ft. lb.) Tightening Torque 100 Nm (74 ft. lb.)

Fig 4: Installing Torque Wrench On Central Screw
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Mark the vibration damper and central screw for torque-angle tightening using a water-resistant marker -3- .
1. 5.1. Make an initial mark on the vibration damper and central screw at the same position -1 and 2- .
2. 5.2. Make a final mark in accordance with the specified torque angle only on the vibration damper -3- .
  NOTE:
  Incorrect handling of tools
  - Risk of damage to the body
  → Only use tools approved by Porsche.
  
  → Always ensure that the tool is seated correctly.
  
  → Protect the body and interior of the vehicle from damage with protective covers.
  
  → Cover delicate components with cardboard or sheetmetal panels.
3. 5.3. Turn the torque-angle tightener step by step from the starting mark -1 and 2- on the vibration damper to the end mark on the vibration damper -3- (-direction of arrow- ). Torque angle 180°
Fig 5: Marking Vibration Damper And Central Screw
Courtesy of PORSCHE CARS NORTH AMERICA, INC.