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Join Date: Aug 2006
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The key to setting the proper preload, is being able to find 0 lash. 0 lash is when all the slack is taken out of the valvetrain, so there is no slack between the cam lobe, lifter, pushrod, and rocker.
Rotate the engine in it's normal direction, and right when the exhaust valve moves, stop the rotation. Now you're ready to adjust the intake valve. Loosen the retaining nut, until the rocker arm is loose. Now, slowly tighten the nut with one hand, and spin the pushrod with the other. Just as soon as you feel a small amount of tension on the pushrod, stop tightening the nut. This should be 0 lash. It should be the point where there is no slack (lash) in the valvetrain, but not tight at all, if that makes sense. You may try it several times to get a feel for it.
Once you get to 0 lash, tighten the nut another 1/2 turn to set your preload. Now you're done with that valve.
Now, continue turning the engine until the intake valve cycles fully open, and then closes about 1/2-2/3 of the way, and set that valve the same way. Find 0 lash, then set the preload. Do this for all the cylinders, and you're good. Easy stuff.