Preliminary Work

Secure engine on assembly support. → 1001IN SECURING ENGINE ON ASSEMBLY SUPPORT (MOUNTING BRACKET)
Remove turbocharger. → 213019 REMOVING AND INSTALLING TURBOCHARGER
Remove upper part of oil pan. → 175019 REMOVING AND INSTALLING OIL GUIDE HOUSING
Remove intake-air distributor. → 244619 REMOVING AND INSTALLING INTAKE-AIR DISTRIBUTOR
Remove camshafts. → 150520 REMOVING AND INSTALLING CAMSHAFTS
Remove timing-case cover. → 153319 REMOVING AND INSTALLING TIMING-CASE COVER
Remove timing chain. → 153519 REMOVING AND INSTALLING TIMING CHAIN
Remove deflector rail and tensioning rail on the cylinder head. → 154719 REMOVING AND INSTALLING GUIDE AND TENSIONING RAILS
Loosen fuel connection line on the fuel collection pipe.→ 243019 REMOVING AND INSTALLING FUEL DISTRIBUTOR PIPE
Disconnect electric connector -1- on the high-pressure sensor.

Fig 1: Disconnecting Electric Connector On High-Pressure Sensor
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Disconnect electric plug connections.
1. 11.1. Outlet hall sender -1- and intake hall sender -4-
2. 11.2. Hydraulic valve for valve lift adjustment -2-
3. 11.3. ONLY BANK 1cyl. 1-3: Coolant temperature sensor -3-
  
  Fig 2: Identifying Electric Plug Connections
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Disconnect coolant vent line -1- on the relevant cylinder head.
1. 12.1. Unscrew screw -2- and pull off line.
  
  Fig 3: Identifying Coolant Vent Line
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Remove crankcase vent line -1- .
1. 13.1. Unscrew screw -2- .
2. 13.2. Pull line out of the crankcase and remove line.
  
  Fig 4: Exploded View Of Crankcase Ventilation - 4WD
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
  
  Fig 5: Exploded View Of Crankcase Ventilation - 2WD
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Loosen secondary-air line at the cylinder head.
1. 14.1. Unscrew screws -4- .
2. 14.2. Remove seal -5- .
  
  Fig 6: Exploded View Of Air Injection System
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.