Removing
1. Remove the valve cover as described in Chapter 4.
2. Using a 10mm Allen wrench, remove the two cylinder head bolts that also secure the left and right rocker arms to the head.
3. Evenly and gradually loosen the four valve train mounting bolts a half turn at a time. until the pressure of the valve springs on the rocker arms is released. Remove the bolts, marking the location of the oil shield, which is mounted on the top of the right support, and lift the valve train assembly from the cylinder head (see illustration).
4. If necessary, the valve train assembly can be disassembled by removing the circlip from one end of the rocker shaft and removing the various components from the end of the shaft. Lay out all the components in the correct order so as not to mix them up during assembly (see illustrations).
Inspection
5. Having disassembled the valve mechanism, inspect the working surfaces of the rocker arms and shaft for the presence of worked out places and scratches. If there are visible signs of wear, the corresponding rocker arm and/or shaft must be replaced.
Installation
6. If the valve train has been disassembled, reassemble it in the reverse order of removal and secure all components with a circlip. Make sure the circlip is properly seated in the groove and that all rocker arms rotate freely on the shaft.
7. Lower the valve mechanism to its working position on the cylinder head, making sure that all rocker arm adjustment screws are correctly located at the ends of their respective push rods (see illustration).
8. Insert the four bolts of the valve mechanism and, having correctly placed the oil shield in the right support, tighten them evenly and gradually with the tightening force regulated specifications (see illustrations).
9. Insert two bolts of fastening of a head of the block of cylinders fixing also the left and right support, and tighten them at first the moment of an inhaling. Stage 1 (see specs), and then trust on the specified in Specifications for stages 2 and 3 corners. If necessary, follow Chapter 6, paragraph 26.
10. Adjust valve clearances as described in Section 1.
11. Install the valve cover as described in Chapter 4.