strange sound from the engine

[LTUDSM]

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does anybody knows,what is that sound???? or where should i look for it??? i thought it was a tensioner pulley,i replaced new tensioner and idler pulleys,along with new auto tensioner and t-belt. my second thought was the lifters,so i bought a set od revised lifters,put them in,and yeaah, sound still there (((

edit:
i read something about it on the forum,and some guys saying ,that the sparkplugs has to do something with that engine noise.as you can see in a video,i took the wire from num 4 cyl and no changes on the idle were made.....

here i updated video today, the sound comes ,as soon as i start my engine,and it doesn't go away no mater if i rev or not......

<embed width="448" height="361" type="application/x-shockwave-flash" wmode="transparent" src="http://i136.photobucket.com/player.swf?file=http://vid136.photobucket.com/albums/q184/marka_bucket/Video020.flv">

 

[BigTerbo]

deff,i put Permatex red thread lock and tight the bolts to 100 lbs,so im positive,that the flywheel doesn't have anything to do with that

you said that the clutch broke..... are you sure there wasnt any pieces of the clutch in the bell housing or something like that.... that maybe the flywheel is hitting as it spins???

 

[LTUDSM]

neaaah,i cleaned the whole bellhousing with the gasoline,cause it had some sh*t in it.so nothing is inside the bellhousing

when i have time,ill take the oil pan off,and the bearings,then ill make pictures and post in here,so everyonecould see,them and say theyre opinion

 

[LTUDSM]

ok i took the oil pan off,and found some metal shavings.One of my rod journal (2nd cyl) was kinda red blueish (overheated) so i took the journal off,and the scratches were inside the bearing.The rod journal looks like new,so that means that i didn't spun a bearing,it looks like i melted by not having enough oil in there.Also my crank needs to be polished.Would i be able to take the crank off from the bottom without taking the whole engine out???

 

[LTUDSM]

anyone???