Join Date: Oct 2000
Location: Robbinsdale, MN
I've heard the suggestion that, to avoid pumping up stock type lifters above 5500 rpm, you just tighten 'til the noise disappears and basically leave them there, or maybe an 1/8 of a turn past that, rather than the full 1/4 to 1/2 turn for the recommended .020 to .040 lash. This gets rid of the clatter, but prevents valve float at higher r's.
Any thoughts? (Before I fire up my new engine??!! I spun the pushrods as I adjusted the nuts 'til I felt the slightest resistance, and then gave another 1/8, or slightly less, of a turn.)
I've talked to mechanics who say they do all adjustments on a non-running engine, and maybe not even hot - that it just doesn't matter that much. Of course they're usually working on someone's grocery-getter. All the components involved are steel or cast iron. The diffences in coefficients of thermal expansion (which would cause the change in clearance) should not be that great.
Also, is there any good way to avoid an oily mess when setting lash on a running engine? I've only been involved in the process on a running engine once (watching someone else do it) and there was oil squirting everywhere.