Removing Timing Chains

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NOTE: Incorrect handling of crankshafts

Risk of damage to the timing system

→ Never turn the crankshaft against the rolling direction or when the chain tensioner is removed.

→ Proceed carefully with your work.

→ Only turn the engine at the crankshaft.

→ Observe general warning notes and working regulations.

Loosen the timing chain.
1. 1.1. Unscrew the chain tensioner -9- . → 153519 REMOVING AND INSTALLING TIMING CHAINS ON V6 DFI ENGINES
2. 1.2. Unscrew the bearing pin -11- .
3. 1.3. Pull the tensioning rail -8- for the chain tensioner down and out.
4. 1.4. Remove guide rail -23- by unscrewing the fastening screws -20 and 21- .
5. 1.5. Remove timing chain from the camshaft controllers -4 and 25- .
Fig 1: Identifying Timing Chains Components
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Remove camshaft controller.
Information

Fix camshaft in place
- To loosen the fastening screws on the camshaft controller, counter the relevant camshaft with an open-ended wrench (a/f 27) .
- To prevent damage, remove the camshaft guide .
1. 2.1. Remove outlet camshaft controller -4- by unscrewing the fastening screw -22- . Counter the camshaft at the hexagon → Camshaft hexagon with an open-ended wrench when doing this.
  Information
  
  Fix camshaft in place
  - To loosen the fastening screws on the camshaft controller, counter the relevant camshaft with an open-ended wrench (a/f 27) .
  - To prevent damage, remove the camshaft guide .
2. 2.2. Remove intake camshaft controller -25- by unscrewing the fastening screw -22- . Counter the camshaft at the hexagon with an open-ended wrench when doing this.
  
  Fig 2: Identifying Camshaft Hexagon
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Information
- Always check all components, such as timing chains, sprockets, locking pins and chamfers for wear or damage. Always replace faulty components .
- Always replace all fastening screws for the sprockets .
- Before removing the timing chains, mark the running direction with a colored pen .
- Maintain the same timing chain running direction during re-installation .
- Never use a prick punch or file for marking .
Remove timing chain -3- .
1. 3.1. Remove oil pump sprocket -13- by unscrewing the fastening screw -14- .
  Block the crankshaft using Counter-Hold Tool T10069 .
  
  Fig 3: Identifying Counter-Hold Tool
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Relieve the drive chain -17- .
1. 4.1. Remove chain tensioner and tensioning rail -15- . To do this, unscrew both fastening screws -2- .
Remove the drive chain -17- .
1. 5.1. Remove the sprocket -12- from the oil pump shaft.