Yes....if you want to trust your engine's timing to chance
Doing it properly really requires the right tools.
I've always been confused why, on modern engines, the job is no longer just 'line up the pulleys, remove belt, fit new belt' but is now 'unbolt the non-keyed cam pulleys, line up the camshafts, fit new belt, retighten the pulleys'.
Why would it not be possible to mark up the pulleys, and fit the new belt without moving the pulleys? I've heard that the old belt may have stretched; the assumption would be that the new belt must be the same length as the old belt was when it was fitted, and therefore, why should the pulleys need repositioning on the cams?
Also - is there a crank pulley marking or flywheel marking for TDC, or must we use the DTI/TDC indicator in a spark plug hole?
Thanks for any light you can shed on this eternal mystery, which I have carried through ownership of a Stilo, a 166, and now the 156.