Remove the cylinder head covers, the camshaft supports and the camshafts (Removing the camshafts).
Loosen the eight plugs (11) and collect seals (12).
Using an M6 screw, withdraw the shafts (13) of the opening rocker arms (3) on the exhaust and intake sides.
Remove the opening rocker arms (3).
Using the pawl of the rocker arm spring tensioning kit no. 88713.2069 installed between the spring and the inner wall of the cylinder head, move the straight end of return springs (15) and (16)
and insert it in the drilled shaft.
Springs (16) and (15) must be removed from inside the swinging arm hole.
Use the shaft to slide the end of the spring into its rest position.
Using an M6 screw, withdraw the shafts (17) of the closing rocker arms on the exhaust and intake sides.
Remove the closing rocker arms (6) and (5), the springs (16) and (15) with the spacers (18).
Remove the sealing rings (14) from the ends of the valve guides.
Repeat the same procedure for the other cylinder head.