I was doing some research about removing and installing hydraulic valve lifters. I watched some videos on Youtube and found this one quite informative. However, there are a few questions I should ask. There is a hole in the lifter body (which I have specified with the letter A) and another hole in cylinder head (Hole B).
In the video (between 4:55 and 5:00), he installs a newly cleaned lifter but why didn't he align the two holes (A & B) together? 1 - If the hole B is the channel for supplying oil to the lifter, how can the lifter be filled with oil if it is installed in the wrong position?
2 - Why didn't he fill the lifter with oil first before installing it on the cylinder head?
3 - If a 16 valve engine has 12 good and 4 bad lifters, is it possible to replace only the 4 faulty ones and keep the good ones?