Hard knocking from 1.8T AEB
 

Let me tell this little story from the beginning...
One week i got my car from timing belt change (also other belts and tensioners and oil + filter), it was working like charm. Later same night car started to tick.
5 Days later when i was on way to work it started to run with 3 pistons only. I changed spark plugs to NGK Platinum plugs, one plug was missing this "bend" that comes over the spike. I started it and YES! ticking sound was gone.
Later i was going to see my friends, i got 200 meters from home and again running with 3, then it shutdown completely. I waited for a while and started the engine, it ran with three pistons and i tried to drive it to home. Suddenly it started to make really loud knocking and i shut the engine.
It was towed to workshop. One broken/stuck lifter was found and replaced it (how do you call it when things kinda weld together?).
Still same sound but runs fine with 4 cylinders now.
Today oil pan was open but no loose on connecting rod bearings was found.
It's been there now a month. I really would like to get it back to road.

Here is sound sample from it:

http://tinypic.com/player.php?v=j5h2...5#.UqyqgfTd_Z9

I got no good answers from finnish Audifinns forum, so i tried from here.

oh that does not sound good at all.. I'd first double check the timing belt - Make absolutely sure it's correct at Top Dead Center (TDC) for the cams and the crank.

Timing has been checked three times already :D It's as close as it can be

EDIT. Does anybody have somekind of xray photo of these oil tunnels? I could check if these have somekind of garbage in it.

Cylinder head was disassembled from the motor. This broken spark plug bend was between piston and cylinder head. So i think we finally found the problem!

Yikes.. Well, glad you figured it out, and that it wasn't a mangled valve!

Yes, all valves was straight and ok!