Removing Timing Chains

→ 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.

→ After working on the camshaft, re-set the valve timing.

→ Observe general warning notes and working regulations.

Fig 1: Overview Of Timing Chains

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

1. Relieve the timing chain.
   1. 1.1. Unscrew the chain tensioner -9-  . → Removing chain tensioner  .
   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-  .
2. Remove camshaft controllers.
   Fig 2: Removing Camshaft Controllers

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   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 with an open-ended wrench when doing this. . → Fig 2

      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.

      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 coloured pen. 
      • Maintain the same timing chain running direction during re-installation. 
      • Never use a prick punch or file for marking. 
3. 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: Blocking Crankshaft Using Counter-Hold Tool T10069

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.
4. Relieve the drive chain -17-  .
   1. 4.1. Remove chain tensioner and tensioning rail -15-  . To do this, unscrew both fastening screws -2-  .
5. Remove the drive chain -17-  .
   1. 5.1. Remove the sprocket -12-  from the oil pump shaft.