According to the Aftermarket engine catalog I am looking at, The T6 used the Farmall M/ McCormick Deering W6 C-248 engine. The Early T6 Series 61 used the C-263 from the Super M, Super MTA, 400, Super W6, Super W6-TA and W-400. The Late T6 Series 61 used the C-281 from the 450. The TD-6 and TD-6A used the D-248, the TD-6 Series 61 used the D-263 and later the D-281 and lastly, the TD-6 Series 61 used the D-282 from the 560, 660, 656, and 706.
I would imagine that you have either the D-248 or the D-263. They are readily available from the wheel tractors, and most of the parts are still available as well. If not operated properly, there was the distinct possibility of cracking the complex head casting (which used 3 valves per cylinder; 1 intake, 1 exhaust, and 1 starting valve to uncover the sparkplug) The heads, from what I've heard are NOT readily available. They were excellent on fuel, though.
Did the starter make any noise like it was engaging something when you pressed the button? It is possible the starter locked in the flywheel teeth, in which case, you simply unbolt it and put it back in. More than likely though, if there was a large bang when it was parked, something catastrophic occurred in the motor and that is the problem. Next would be to try a pry bar on the ring gear or a handcrank or pipewrench on the crankshaft. You may want to consider removing the pan and/or the valve cover and see what you've got. If something is jamming it up, trying to turn it over will only wreck more usable parts. Putting some hydraulic/ automatic transmission fluid or penetrating oil in the cylinders couldn't hurt either. The starting valves must be open in order for it to reach the rings through the spark plug holes, though.
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