AZGhost623 Posted October 16, 2013 Share Posted October 16, 2013 (edited) So two weeks ago this happened AGAIN. Another rocker popping off. This time I was stranded and had to be towed home engine wouldnt run at all. I fixed it again the next day, and I set all the valves to 8 thousandths from what a local datsun mechanic told me, and compression tested all cylinders which tested to be between 220-230 across all 6. So I have no clue about this valve train. All I know is that it supposedly has this cam (spec sheet attached, which I doubt because of no rough idle), the P90 head has been shaved .080 with the shims and such. I have since ordered from Schneider new double hylift springs, and new retainers. Should I get new lash pads (what size?) and rockers as well? All the rockers look just fine from what I could tell I didnt see any weird wipe patterns or damage on the rockers or cam. I Appreciate any kind of assistance to help get my valve train setup right. Edited October 16, 2013 by AZGhost623 Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted October 16, 2013 Share Posted October 16, 2013 If your lash pads are thicker than.....i think, 0.170", you can't use the stock retainers. To find the correct thickness you just have to set it up and check the wipe. Quote Link to comment Share on other sites More sharing options...
AZGhost623 Posted October 16, 2013 Author Share Posted October 16, 2013 its got stock retainers it in now.. Quote Link to comment Share on other sites More sharing options...
Leon Posted October 16, 2013 Share Posted October 16, 2013 I run stock retainers with .200" and .220" lash pads without issue. Quote Link to comment Share on other sites More sharing options...
Xnke Posted October 17, 2013 Share Posted October 17, 2013 Check for a sticking valve. That will chuck rockers every time. All I can say about running tall lash pads in stock retainers is that it is only a matter of time and revs. I did it for two years before I lost the first one. Quote Link to comment Share on other sites More sharing options...
AZGhost623 Posted October 17, 2013 Author Share Posted October 17, 2013 well I am replacing the retainers, and and springs with brand new parts from schneider. So hopefully that will make a difference. Plan to tackle it this weekend and hopefully have some really good results afterwards with no more failures like that. Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted October 17, 2013 Share Posted October 17, 2013 If your lash pads are thicker than.....i think, 0.170", you can't use the stock retainers. To find the correct thickness you just have to set it up and check the wipe. I'm pretty sure it's thinner lash pads that cause problems with retainers because the rocker will contact the the retainers with super thin lash pads. Quote Link to comment Share on other sites More sharing options...
AZGhost623 Posted October 19, 2013 Author Share Posted October 19, 2013 So I got my parts in, and the box it came in was a bit confusing contradicting the website. So I sent Jerry an email over at schneider, and he responded pretty quick. The hy-doubles part 68025 says on the box 110# seat pressure. But on the website it said 125#. Jerry responded saying that lash pads at 1.75 = 110# and at 1.70 = 125#. Why would smaller lash pads equal more spring seat pressure especially at such a small difference in size? Quote Link to comment Share on other sites More sharing options...
Xnke Posted October 20, 2013 Share Posted October 20, 2013 He's got spring height goofed with lash pad thickness. 1.75" installed height = 110lbs seat pressure. 1.70" installed height = 125lbs seat pressure. Quote Link to comment Share on other sites More sharing options...
AZGhost623 Posted October 21, 2013 Author Share Posted October 21, 2013 Yep I sure did. I just got done replacing all that stuff so hopefully I should be good to go now. The lash pads determine where its wiping at on the lobe.. Have no idea what my installed height is.. how do you measure that? Just get out a ruler? lol Quote Link to comment Share on other sites More sharing options...
Xnke Posted October 21, 2013 Share Posted October 21, 2013 Measure from the spring seat to the spring retainer with a spring height caliper Quote Link to comment Share on other sites More sharing options...
AZGhost623 Posted October 22, 2013 Author Share Posted October 22, 2013 (edited) I was being a bit facetious with the ruler comment, I assumed it was some special tool. Measuring them out while installed, they are at different heights. I assume thats in relation to the valve stem length since its being held up by retainers from the new springs? Should I check it again in a few weeks after driving it to see how the springs react to being hot and cooled? I retained the stock shims that were previously installed. If I need to replace the shims, is there a kit out there that has various shim sizes? I only had 1 intake that measured out correctly out of all 12. Edited October 22, 2013 by AZGhost623 Quote Link to comment Share on other sites More sharing options...
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