Its done, i used the 1/2 drive socket on it with a breaker bar, like you said, but i had to bump the engine four times before the bolt got lose.
(at the begining i has afraid, but everything went ok)
Yes its true, Now i need to undo the mount anyway to get the belt off.
i´m gonna do it this afternoon.
To put the ckanshaft bolt again, i have to used the drive socket with a breaker bar again?