The timing belt looks brand new on my 3.4 DOHC, thank goodness.
However, I know I'll have to change it someday so I've been reading up on it for the hell of it. I'm still a bit foggy on some issues:
1. Why isn't it a matter of marking all the pulleys, loosening the tensioner, removing the belt, and reinstalling the new one making sure the pulleys haven't moved?
2. What's the actual function of the cam hold-down tool? If to keep the camshafts from moving, why couldn't you do this from the front without pulling the plenum and valve covers?