A steel pipe of length 1.8m, outside diameter of 116mm, wall thickness of 8mm, is subjected to an axial compressive load of 180kN. Assuming E=200GPa and v=0.3, find a)the shortening of the pipe, b)the increase in outside diameter and c)the change in wall thickness. Anyone?

I have a 1992 Nissian Pickup, I rebuilt everything and purchased a refurbished head from advanced auto. After getting the engine going it seems as though the lifters are knocking. Are these adjustable? If so where is the adjusting screw?