Figure 2.20. Cylinder head and valves (12-valve engines): 1 - Cylinder head mounting bolt; 2 - Cylinder head; 3 - Cylinder head gasket; 4, 10 - Valve crackers; 5, 11 - Spring plate; 6, 12 - Spring; 7, 13 - Spring seat; 8, 9 - Inlet valve; 14 - Exhaust valve; 15 - Valve stem seal; 16 - Inlet valve guide; 17 - Exhaust valve guide; 18, 19 - Inlet valve seat ring; 20 - Exhaust valve seat ring; 21 - Cylinder head