Valve Lash Pad Replacement

[fastd]

trying to set valve lash.

a couple of things:

1. can't get one valve (exhaust) lashed wider than .007 (trying for .010); can this be resolved by anything other than replacing with a smaller lash pad? doesn't this seems like a strange problem; how does the previous owner get all but one valve right?

2. i believe i have a schneider stage iii cam - is anywhere on the 180 degrees of the heel of the cam "heel" is ok to set the lash? does it matter if its not TDC, or the lobe center isnt pointing towards the sky? The reason i ask is that it feels like maybe the lash is changing even when i am on the 180 degree heel arc...is that possible?

3. most importantly, how do i replace the lash pad without removing cam and/or the least amount of effort.

Thank you,

fastd

[Jeff G 78]

Something is wrong. Either something isn't seated properly, or the ball stud isn't threading in and out right, or ??? You should be able to run the ball stud down to the point that there is a huge lash.

First, is it running down all the way? If not, you found the issue. If it is, check to make sure the lash pad isn't turned sideways. If it is, the rocker will not be seated properly in the lash pad and will cause the lack of adjustment range.

If you need to remove a lash pad, simply use a large flat screwdriver to open the valve and remove the pad. Rotate the engine so that the cam lobe in question is pointing up and then remove the spring holding the rocker to the ball stud. Just use your fingers and pull it over the end of the rocker. Now put the screwdriver under the cam with the blade on top of the valve spring cap. Position the shaft of the screwdriver so that it is on the cast portion (not the lobe) of the cam and pry up on the handle. The valve will open and you can remove the rocker. Once the rocker is out of the way, you can remove the lash pad.

To answer your other question, no, the cam doesn't have to be perfectly aligned. There is about a 120° window where you are on the base circle with no valve lift.

Edited May 14, 2013 by Jeff G 78

[siteunseen]

I had one fall out after a rebuild and Jeff helped me to get it back. I couldn't explain the procedure like he can. Way to go Jeff!!!

[fastd]

follow up this: i replaced the valve lash pad (.180 with a .175) and my problem was solved.