Change Peugeot 307 SW HDI 1600 Auxiliary Correa

I need to change the auxiliary strap of my Peugeot 307 SW Motor HDI 1600 - 110CV year 2007, someone can tell me how the belt is unbelieved.

Hello, I am a mechanic and time behind I had that problem.
The vehicle was a Citroen C4 HDI 90 hp. It is the first time that it happened to me, I had to go to the house and that they set up the belt.
This strap is elastic and in the house they have users to mount it without problem, since as you say, it does not have a tensioner.
Not to ride them, you can load the belt.

Thank you Xexare, but I think it's not elastic, I haven't looked at it in depth either because I haven't disassembled anything to see it well. I have been looking for and all that I find are other types of engines that are not Peugeot 307 SW HDI 1600 110CV year 2007 just like mine and carry different types of tensioners, in mine I have not seen any tensioner, I think everything has to be to weave the belt in the alternator, but I have not seen how. That's why I ask if someone would know how to do it to be able to disassemble it.