No, no, no. They are hydraulic. You do not tighten anything. If the lifters are clattering, then you likely let it go way too long and now they are not pumping up. There is no fix for that short of rebuilding the engine and boiling the block. Change the oil next time.
December, 1, 2011 AT 4:37 PM
If your oil was extremely dirty you might have a clogged oil port. Hydraulic lifters are not adjustable