on the link that was posted to youtube, with you saying this is the noise... the comment listed below the video (on youtube) say he had a mechanic sort it out, turned out to be the timing was out on a pulley, you had your cambelt done and now suddenly a problem occurred.... I would concentrate on looking at getting your timing checked before replacing PCV, flywheel etc... I could be sadly mistaken and read all wrong! once you fixed it, post up what it was