Porsche 996 TT Repair Manual page 561

• Initial tightening to 30 Nm (22 ftlb.).
• Loosen all screws again in reverse order.
Tighten screws to 20 Nm (15.0 ftlb.)
•
• Retighten screws to 20 Nm (15.0 ftlb.)
• Retighten screws with torque angle of 1 x 90°.
Location Thread
Cylinder−head
nuts
996420, 996421, 996450, 996451, 996620, 996621, 996650, 996651, 996840, 996841
15 70 23 Installing cylinder head
einordnung
Tightening torque Nm (ftlb.)
30 Nm (22 ftlb.), then loosen; 20 Nm (15.0 ftlb.); then retighten all screws
again to 20 Nm (15.0 ftlb.) +90° torque angle
498