Curiousity got the better of me and I pulled the pan off my dump truck. The crank broke just aft on the #2 main. The result was catastrophic. The rear wall is ripped clean out of the block and #3&4 rods are as a result bent.
Fred's post on this forum is concerning alignment of the transmission and all engine components is vital to the long term durability of a T engine. That being said, I am amazed at how forgiving these engines are considering they are all at least 80 years old. Looking at my crank it is obvious that it was cracked for a long time. In fact it appears that only about 25 percent of the crank's cross section was intact just prior to the failure. So in addition to alignment, have everything magnafluxed! It will save you a headache. My new engine will be built with all the advantages of what we have learned on this forum and by experience.
I would add that they should be x-rayed as well as magnafluxed. When my crank snapped there was a 25% void at the break point that would not have shown up when magnafluxed because there was no crack. I too am amazed that the crank survivied 98 years at only 75% of it's intended diameter.