I have D16Z9 and some time ago randomly appeared high-pitched noise from timing belt side. Later it disappeared for a week, but then it started again. When starting totally cold engine it remains quiet for 2-3 minutes and then squeak appears. Like I said it comes from timing belt side and it is not from timing belt tensioner, water pump, alternator or power steering pump. I changed timing belt tensioner and water pump (they counted only 10k km, but looking for a problem, I changed them too), also tried to start engine without alternator and power steering pump belts. However, sound remains.
Here's a short video of the sound:
So what it can be? Timing belt? Oil pump? Any ideas? Thanks!

 

Check the idler pulley and the power steering pump and belt.

 

Already tried to start engine without power steering pump belt and the sound remains. Also, I replaced belt tensioner, but nothing changed. If You're talking about crank pulley, I guess there's nothing to squeak, because there's no bearing on that pulley.

 

There's a timing belt tensioner and an idler pulley for the A/C belt. Did you replace both?

 

I replaced timing belt tensioner. I don't have an A/C. Are You talking about this pulley?

If yes, so I didn't changed that, but I guess there's nothing to squeak in that pulley, because there's no bearing.

 

That's the crank pulley. Do you have an A/C compressor and belt?

 

No, I don't have an A/C.

 

Use an engine stethoscope to pinpoint the squeaking noise.

 

That doesn't sound like a belt squeak, sounds like metal on metal. Do you have those spacers that go betwen the crank gear and the oil pump?

 

I guess You're talking about spacers with concave (I marked them in red)? I do have that spacers.