Crankshaft falls out when adding piston

[froggy]

So, I have gotten most of the parts in my block, but when I go to put a piston in, it breaks off the crankshaft EVERY time. It's screwed in all the way, and it even popped off with the oil pan over the crankshaft. What do I do to keep it on while adding piston?

[MrVein]

did you tighten all 3 main bearings?

also i think it helps to align it if you put engine backplate on.

[froggy]

Yes. All bolts have been tightened down and the engine backplate is on the rear, as well. Bahh can't figure this dang thing out!

[Marcomies]

What happens to the three bearings when the crankshaft falls out and can you really just pop the crankshaft back in place after that?

[froggy]

I don't think I have any of the bearings installed. Those are the little rusty looking U shaped pieces, yes? Maybe that is my problem, then

[Ⓡ | Fry]

Yes that is your problem.