911sc 3.0 Problem
 

noise, what could it be?
20120411_184433.mp4 - YouTube

Are you talking about the clunking/rumble? Sorta like a thump thump with no real timing to it.

I'm sorry I do not understand the angielsku.Problem noise only occurs on cold engine

Take the fan belt off and try it for a very short while (no cooling)

ok thank you

That sounds like it could be your alternator bearing going. They make funny noises when they start to go and yet the alternator will still work. Take the belt off and rotate it by hand and see what kind of sound you get.

Also check for play in the shaft movement.

SteveKJR