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Originally Posted by svopaul
Actually it's not "when you can't turn the pushrod by hand anymore" that is too tight. You tighten it up until the pushrod starts to give resistance to spinning...if it stops completely and you can't sping it then it's too tight. Then it's 3/4 turn past Zero preload  |
No, you're right. The preload really has nothing to do with how tight the pushrod "feels." because if you try your method with a new, non-pumped lifter, it will tighten freely until it bottoms out. That's why it's critical to just have the pushrod against the spring in the lifter. Then it's at zero preload...but it takes a fine-touch.
I also am leery of the 1/4 up to a full turn I hear people talk of. I've tried both & it's noisy on some rockers, quiet on others. I've found a good balance at around .020-.030 in which case you should measure the thread pitch to find true preload. Just clarifying...Good thread.