Installing Cylinder Head

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Information

If cold or excessively low-tempered components are sealed to each other by applying sealant, leaks can occur because of condensed water forming or components distorting. Components must be uniformly at least → Temperature: 17°C .

Install cylinder head.
Information
- It is best to use only a spatula and acetone to clean the sealing faces. Ensure good ventilation because of the acetone!
- Use a cleaning cloth to wipe the sealing faces clean and remove any grease .
- Replace the cylinder-head gasket .
- Replace the cylinder-head screws with new ones .
1. 1.1. Thoroughly clean all sealing faces before assembly.
2. 1.2. Cylinder head gasket Must Always Be Replaced .
3. 1.3. Always observe tightening sequence (1-20) for cylinder-head screws -1 to 20- and tighten to the specified torque.
  1. 1.3.1. Tighten cylinder-head screws to an initial Tightening Torque of 15 Nm (11 ft. lb.).
  2. 1.3.2. Tighten cylinder-head screws to 30 Nm (22 ft. lb.).
  3. 1.3.3. Then tighten all cylinder-head screws a Second Time to 30 Nm (22 ft. lb.).
  4. 1.3.4. And finally, tighten the cylinder-head screws to a torque angle of 180°.
    
    Fig 1: Identifying Cylinder Head Tightening Sequence
    Courtesy of PORSCHE CARS NORTH AMERICA, INC.
  1-6 - Pistons of cylinders 1-6
  
  1-20 - Tightening sequence for cylinder-head screws → Initial tightening: 15 Nm (11 ft. lb.) → Tightening Torque: 30 Nm (22 ft. lb.) → Torque angle: 180°
Secure the timing case to the cylinder head. -1- Fit both M8 screws → Tightening Torque: 23 Nm (17 ft. lb.) .

Fig 2: Identifying Lower Timing-Case Cover Screws
Courtesy of PORSCHE CARS NORTH AMERICA, INC.