Setting Valve Lash Please Help
Thread Starter
Staging Lane
Joined: Oct 2011
Posts: 73
Likes: 1
Setting Valve Lash Please Help So I'm chasing a valvetrain tick and decided to check my pushrods and relash all my rocker arms. I followed shbox's method of doing it with the engine off with either #1 or #6 TDC. All stock components.
I've gone over all the valves with #1 being TDC, but something doesn't seem right. Compared to the rocker arms I haven't touched, the ones that I've retightened don't wiggle left and right like the others, and the amount of threading i've used on the stud is less than the untouched arms too. I've only been tightening beyond zero lash an additional 3/4 of a turn.
Is it possible that with my 165k mile engine, the rocker arm nuts came loose and thats what allowed that freeplay in the arm? Or did I mess up setting zero lash? (I've been moving the pushrods up and down while tightening and then setting preload when I can't move them anymore).
Also, I didn't remove the studs in this process and retorque like I see on Alldata because I didn't think it was necessary. Should I have?
I've gone over all the valves with #1 being TDC, but something doesn't seem right. Compared to the rocker arms I haven't touched, the ones that I've retightened don't wiggle left and right like the others, and the amount of threading i've used on the stud is less than the untouched arms too. I've only been tightening beyond zero lash an additional 3/4 of a turn.
Is it possible that with my 165k mile engine, the rocker arm nuts came loose and thats what allowed that freeplay in the arm? Or did I mess up setting zero lash? (I've been moving the pushrods up and down while tightening and then setting preload when I can't move them anymore).
Also, I didn't remove the studs in this process and retorque like I see on Alldata because I didn't think it was necessary. Should I have?
10 Second Club
Joined: Oct 2007
Posts: 2,630
Likes: 28
I do way less than 3/4 of a turn. After you spin the engine over to do other rockers, the ones that were once tight will bleed a little oil out of the lifter since there is no oil pressure. Then that same rocker will wiggle and click now. I start at zero lash and then tighten an additional 1/16th of a turn. 3/4's of a turn will work just fine for 99% of us, but if you have a big hydraulic cam and spin it very high, you'd be better off with less preload.
Thread Starter
Staging Lane
Joined: Oct 2011
Posts: 73
Likes: 1
I do way less than 3/4 of a turn. After you spin the engine over to do other rockers, the ones that were once tight will bleed a little oil out of the lifter since there is no oil pressure. Then that same rocker will wiggle and click now. I start at zero lash and then tighten an additional 1/16th of a turn. 3/4's of a turn will work just fine for 99% of us, but if you have a big hydraulic cam and spin it very high, you'd be better off with less preload.
