How to replace the hydraulic lifter

 

Most of the Sonatas have manuall lifters (not hydraulic) and you have to remove the cam. Which engine?

 

2.4 liter

 

Not sure if I have to remove the cam I've been trying to find a video on YouTube for the same year make or for the same make and model and that's almost damn near impossible so then I went to online for manuals and this is the best thing that came up with was this website

 

What confuses me is when I go to buy the new lifters there are two of them on the bottom side and 2 on the top side or left or right however when you're looking at it now what side I need to replace or is the best to replace all four

 

I have a 2011 2.4l the lifters are not hydraulic. Why do need to replace them? They are adjustable with replaceable shims. The cam must be removed to replace the lifter on all 2.4l
There are 4 lifters per cylinder.