please help me with this, considering that is impossible to place two or three separators per valve, to accomodate a sharing of the stress around the valve circumference, and knowing that i can only place one 5mm nylon separator per valve,...do you think that i am on the risk of bending the valve rod ?
Interesting idea, but the usual way to assemble a head is cam first, rockers/rockershaft second.
First you put in the cam with plenty of lub on the bearing surfaces.
Then put in the rocker shafts, assembling each rocker system in a row, all intake then all exhaust, rotating the cam so that the rocker being added is unloaded. You have to pound the rocker shafts with a soft mallet, but no other special tool is required.
The rocker shaft needs to be slightly out of place to add the retainer clips for each rocker, but all one shaft can be done a once.
it was time to introduce the camshaft, so i prepared the head for it, a stable surface, my carpenter table with a wonderful opening in the middle, the head was over two thick long wood pieces to let the valves move freely, and i strongly fixed it with two vices to avoid tilting when using the screwdriver method
yes, i decided to try the screwdriver method as the haynes explains it, just pressing the valves to provide free space for the camshaft to pass through the rockers
starting was not a problem, here you can clearly see the two lateral 10mm thick long wood pieces, that avoid the valve heads hitting the table underneath when you press the springs sequentially
a view of the screwdrivers placed to press the springs: i used three of these as a basis, and an additonal one occasionally
i used a steel plate that lays underneath the table to support the cables that fix the screwdrivers, an additonal problem was that as all the parts were covered with oil, you can imagine how slippery was the cable, so grabbing it was a real problem...
it is impossible to explain the process, you have to check the way in which the camshaft is going to move, and see the rockers that will provide obstacles to that movement, but the degrees of freedom of the system are really a lot, because you must take advantage of the lineal displacement of the rockers too, so there is not a unique solution
it is a pain to advance every centimeter, rotating, moving the rockers, tensioning one, then the other, placing more cable to support the screwdrivers, watching your face realising the big tension that is bending those screwdrivers,...
a pause for dinner, and when i returned it seemed easier,...
done,...yes, but, never again !!
i do not have 12 screwdrivers, but that would have been probably the solution,..., maybe for the next car,...who knows ?