Tighten adjuster 3/4 turn once I take the slack out and feel resistance while manually turning the push rod.
I have experimented with 1/4, 1/2 and 1 turn on the noisy one which hasn't eliminated the the cold engine clack.
I have also attempted to adjust the clacking lifter while the cold engine was running, but couldn't make it go away.
It goes away once the engine is warmed up.
