1. Remove the cylinder head cover.
2. The roller with rocker arms is attached to the head with 10 bolts. Loosen the bolts 1/4 turn, in order from the center to the periphery. Loosen the bolts but do not remove.
3. Remove the rocker roller.
4. If the rocker arms will not be removed, then leave the 4 extreme bolts in place (otherwise the assembly will fall apart). If the rocker arms are to be removed for repair, follow the description in section 6.
5. When installing, finger-tighten the bolts and tighten to the specified torque, making 1/4 turn per step.