see post #13....
http://www.peachparts.com/shopforum/1843786-post13.html

I find it hard to believe that the starter can put out 200ft lb.............

Diesel starters typically exceed 200 ft/lbs. But it's not just the starter torque that counts, it's the torque at the crankshaft. The starter/flywheel gear relationship must be considered, also.

Oh ah yes I didnt think about that part.

Just jam the fly wheel.

Swap in a manual transmission. :D

How do I get to these holes?

I gave this a little though. Again for me a dangerous thing. If one were to apply say a hundred pounds constant air pressure to a cylinder either through the glow plug hole or injector hole.
With the piston at bottom centre. And the valves still closed even if it meant backing off the adjustment on the valves for that cylinder. It could easily resist your heavy torque application on the bolt. This could be used for removal of the bolt as well I imagine. Quicker and easier for me than pulling the starter on a 617. Just a thought.

I managed to jam a 6" socket extension into the pulley from behind...so it jammed against the block and held it solid. I applied force with my torque wrench up to 110lbs....then I moved it up to 150 (max)....then I adjusted the wrench well beyond maximum..... (it goes quite a ways past 150) and got it to click at that setting too(that was NOT easy!)....then I clicked it, and gave one huge Yank on it, and called it good.....its gotta be around 200ft/lbs with that much force. So it is all set. Wshew. Disaster averted, and huge expense.