Installing Pulley (Vibration Balancer)

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: Locating Crankshaft Stub
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Fit the new central screw -arrow- hand-tight.

Fig 2: Locating Central Screw In Crankshaft
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: Inserting Counter-Hold Tool In Vibration Damper
  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 ftlb.) Tightening torque 50 Nm (37 ftlb.) Tightening torque 100 Nm (74 ftlb.)

Fig 4: Tightening 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: Aligning Vibration Damper And Central Screw
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.