Please refer to the section "Camshaft, removal and installation". The camshaft can be removed after removing the rocker arms, their axles and struts as an assembly.
For all SOHC engines
1. Disconnect the cable from the negative battery terminal.
2. Remove the valve cover and bring cylinder number one to top dead center.
3. Remove the rocker arm assembly mounting bolts. The bolts should be loosened two turns each in a crisscross pattern (as shown in Fig. 76 and 77) so that the load on the rocker arm-to-axle connections is reduced evenly to avoid damage.
4. Remove the rocker arms from the axles. Leave the rocker arm mounting bolts in place as you release the axles so that the bearing caps, springs, and rocker arms remain on the axles.
5. If you need to disassemble the rocker arm kit, remember the locations of all the parts for subsequent correct assembly.
To install:
6. Coat the camshaft cams and journals with grease.
7. Reinstall the rocker arm assembly and tighten the bolts lightly by hand. Tighten them two turns each in the proper order, making sure the rocker arms do not interfere with the proper movement of the valves. Tighten the 6mm bolts to 12Nm and the 8mm bolts to 22Nm.
8. Install the valve cover and connect the cable to the negative battery terminal.
For DOHC engines
1. Disconnect the cable from the negative battery terminal.
2. Remove the valve cover and bring cylinder number one to top dead center.
3. Remove the camshaft drive belt cover and the belt itself.
4. Remove the camshaft bearing caps and the camshafts themselves.
5. Remove the rocker arm assembly.
To install:
6. Make sure the keyway is facing up. Loosen the valve lock nuts and adjusting screws before installing.
7. Place the rocker arms on the support bolts and valve stems.
8. Install the camshafts and seals. The seals are installed with the spring side facing inward.
9. Note that the camshaft posts are marked with the letters "I" and "E" and are numbered sequentially to ensure proper installation. Do not use oil to lubricate the surfaces of the posts that are mated with the seals. Apply liquid sealant to the mating surfaces of posts #1 and #6 of the camshaft.
10. Install the camshaft struts.
11. Tighten them temporarily.
12. Using a suitable size mandrel, press the seals onto the camshaft.
13. Tighten all bolts two turns each, starting with the bolt on the 13th pillar. Move from bolt to bolt in an expanding spiral, tightening each one two turns and, having reached the edge, move on to the 13th bolt again until all bolts are tightened to 12 Nm.
14. Adjust the valve clearances.
15. Install the valve cover.