Installing Cylinder Head

NOTIFICATION 

Dirt and contamination 

• Risk of damage to units or components 
  • → Protect components from dirt and contamination.
  • → Clean or replace dirty components.

1. Fit new cylinder-head gasket. Check that the dowel sleeves are installed correctly.
2. Carefully place cylinder head in position.

   Information 

   • The tightening sequence must be strictly observed. 
3. Install cylinder head. Fit and tighten M12 screws according to specifications.
   • Step 1: > Initial tightening 5 Nm (3.5 ftlb.) 
   • Step 2: > Tightening torque 50 Nm (37 ftlb.) 
   • Step 3: > Loosen all screws 0 Nm (0 ftlb.) 
   • Step 4: > Initial tightening 4 Nm (3 ftlb.) 
   • Step 5: > Subsequent tightening 12 Nm (9 ftlb.) 
   • Step 6 - Screws -1 and 2-  : > Torque angle 65° 
   • Step 7 - Screws -3 to 6-  : > Torque angle 60° 
   • Step 8 - Screws -1 and 2-  : > Final tightening torque angle 65° 
   • Step 9 - Screws -3 to 6-  : > Final tightening torque angle 60° 

   After final tightening, the screws -1 and 2-  are tightened to a 130° torque angle and the screws -3 to 6- are tightened to a 120° torque angle! 

   Fig 1: Cylinder Head Screws Tightening Sequence

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Tightening sequence for cylinder head, cyl. 1-2 and cyl. 3-4

4. Fit and tighten screws in the chain housing according to specifications.
   1. 4.1 Cylinder head 1-2, screw M6 x 25:  > Initial tightening 5 Nm (3.5 ftlb.) 

      Final tightening:  > Torque angle 45° 

   2. 4.2 Cylinder head 3-4, screw M6 x 65 -1 (right illustration)-  : > Initial tightening 5 Nm (3.5 ftlb.) 

      Final tightening:  > Torque angle 70° 

   3. 4.3 Cylinder head 3-4, screw M6 x 25:  > Initial tightening 5 Nm (3.5 ftlb.) 

      Final tightening:  > Torque angle 45° 

   Fig 2: Chain Case Screws Tightening Sequence

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Tightening sequence for chain case screws, cyl. 1-2 (left illustration) and cyl. 3-4 (right illustration)

5. Coat hydraulic tappets with new engine oil and insert in original installation position.