I have been Re-doing the lifters preload and after researching the zero lash, i have found a couple of lifters which show resistance when i going to add the 1/2 turn preload.
On the others,the adjusting screw turns very loose when i,m adding the preload.
1) back off all adjusters
2) prelube engine by hand - rotate as mentioned
3) zero lash using up-down method
4) add 1/4 turn and tighten nut
5) once you have adjusted them all, look at the length of the adjusters - they should all be very close in length. If not - you have a problem !!
If you can prelube the motor that's fine, you should still be able to feel "zero" with your up/down method - just use a gentle touch.
It is very common to adjust lifters without removing the intake and valley tray.
Also, and this may sound dumb BUT make sure the pushrod is in the lifter.
What brand are the rockers?
