I've found that a flex-head 1/2" drive ratchet with a longish handle - something like this - comes in pretty handy .
It's not the equal of a monster breaker bar, but the handle's long enough to provide a little extra "oomph", and the flex head makes it, well, flexible.

With a drive extension, it works great for rotating the OM617 (valve adjustments, accessing the drain plug on the torque converter, etc.).

I save the torque wrench for torquing things to specification.