Installing Vibration Damper

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. 

1. Position vibration damper (crankshaft pulley) onto the crankshaft stub. Press the vibration damper slightly towards the engine, while at the same time twisting it until it slips towards the timing-case cover. When doing so, pay attention to the key.
   Fig 1: Positioning Vibration Damper Onto Crankshaft Stub

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2. New  central screw must be fitted hand-tight.
   Fig 2: Locating Crankshaft Central Screw

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   Information 

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

   Cover wing and peripheral parts to protect them.

3. Arm bracket 9679/1  is to be inserted into the vibration damper and turned until it locks. Have a second worker operate the arm bracket.
   Fig 3: Inserting Arm Bracket 9679/1 Into Vibration Damper

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4. Using a torque wrench and a suitable socket (width across flats 27), position at the central screw and only carry out the step-by-step torque tightening  .
   Fig 4: Positioning Central Screw Using Large Torque Wrench

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   Fig 5: Identifying Pulleys

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   1. Water pump pulley
   2. Screw, M8 x 16 → Tightening torque: 23 Nm (17 ft lbs.) 
   3. Vibration damper
   4. Screw, M18 x 1.5 x 72; use new screw; → Tightening torque: 20 Nm (15 ft lbs.)  , then → Tightening torque: 50 Nm (37 ft lbs.)  , then → Tightening torque: 100 Nm (74 ft lbs.)  , then → Torque angle: 180° 
   5. Power-steering pump pulley
   6. Screw, M8 x 16 → Tightening torque: 23 Nm (17 ft lbs.) 
   7. Tandem pump pulley
5. After tightening to the specified torque, mark the vibration damper and central screw for the torque-angle tightening using a water-resistant marker. To do this, make an initial mark on the vibration damper and central screw at the same position -1 and 2-  . Make a final mark in accordance with the specified torque angle only on the vibration damper -3-  .
   Fig 6: Tightening Vibration Damper Central Screw (Viewed From Above)

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   Fig 7: Tightening Vibration Damper Central Screw (Different View)

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→ 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.

→ 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.

Carry out the torque-angle tightening procedure so that the mark on the screw is turned from the initial mark on the vibration damper step-by-step (repositioning the tools repeatedly) to the final mark on the vibration damper -arrow-  . This concludes the torque-angle tightening procedure.

Fig 8: Tightening Vibration Damper Central Screw Using Tool

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