Component Overview

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Fig 1: Identifying Cylinder Head Torx Screws

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

External Torx screw, M6 x 25
External Torx screw, M6 x 80
Cylinder-head screw, internal Torx M12 x 1.5 x 140
Cylinder-head screw, external Torx M12 x 1.5 x 140

Make sure that the twelve displacement bodies -1- are in place on cylinder bank 1-3.

Fig 2: Locating Piston Markings And Displacement Bodies
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Fit a new cylinder-head gasket. Check that the dowel sleeves are installed correctly.
Carefully place cylinder head in position.
Information
- The tightening sequence must be strictly observed.

Fit two external Torx screws (M12 x 140) and six internal Torx screws (M12 x 140) and tighten according to tightening specifications.

Fig 3: Tightening Sequence For Cylinder Head Screws

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Sequence	Designation	Thread	Tightening method	Value
1	Cylinder head screw, internal and external Torx	M12 x 1.5 x 140	Torque	5 Nm (3.5 ft. lb.)
2			Torque	50 Nm (37 ft. lb.)
3			Loosen all screws
4			Torque	5 Nm (3.5 ft. lb.)
5			Torque	12 Nm (9 ft. lb.)
6			Torque angle	60°
7			Torque angle	60°

Screw in four external Torx screws (E10) - three M6 x 25 screws -1- and one M6 x 80 screw -2- - on the inside of the cylinder head and tighten according to specifications.
→ Tightening torque: 13 Nm (9.5 ft. lb.)

Fig 4: Overview Of Screws For Cylinder Head 1-3
Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Fig 5: Overview Of Screws For Cylinder Head 4-6
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Screw in external Torx screws (E10, M6 x 25) on the outside of the cylinder head and tighten according to specifications.
→ Tightening torque: 13 Nm (9.5 ft. lb.)
Coat hydraulic tappets with new engine oil and guide into original installation position.
1. 7.1. Installation position of switching tappets -1- (intake side) and dowel pin -2- .
  
  Fig 6: Identifying Intake Switching Tappets
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
2. 7.2. Installation position of switching tappets -1- (outlet side) and dowel pins -2- .
  
  Fig 7: Identifying Outlet Switching Tappets
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.