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If engine had a catastrophic failure, any number of things could have happened. Broken crank is just as common as spun bearing on these 6.2s. Dropping the oil pan is a good start in accessing engine condition, and a lot easier than getting torque converter off, it will also give you better...

It is possible the crank shaft broke, it has happened on these trucks ,with 6.2s and low gearing, esp when the harmonic ballencer is going out and trying to drive at highway speeds, already at top of max RPMs. If you have just spun bearing, logical solution in most cases is still to look for a...

If the engine is seized for some reason, most of our advice does not apply. I guess that should not be ruled out, but I can't think of how it would be caused by the original symptoms in this thread. Burn connecting rods off crank? You give a lot of good advice here, but I can not picture...

You could undo the glow plugs as mentioned before to eliminate compression resistance. Then a little applied force or light prying. Also you can use ( I think it is 15mm) low offest or combo wrench, box end, to put on one of the bolts that you can reach, as there are 6 bolts, the are two or...

I don't think you should assume you need to do the Heli coil yet. From your picture it looks like the broken starter bolt should come out and threads may be OK. Often times they come out with little resistance. I'd start with a reverse drill bit, more than half the time that works. Next...

My guess is flex plate got bent when starting with only one bolt. It should have same clearance on both sides.

Not to mention the Heli coil starter mount thread repair and broken block at starter mount flange lesson. Had the first one, know a guy who junked an otherwise running engine over the second. I reccomend changing both bolts every time I change the starter if I was not the mechanic putting in...