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good work
I looked at the first crank and decided to make some changes for the second crank. I increased the dwell of "steam" entry and exit. I also made both the supply and exhaust ports on the rear of the crank.
I also re-made the cylinders (not shown) without the exhaust porting at the bottom of the piston stroke.
After some tweaking, the engine will run on compressed air at about 15 psi.
I made a wooden base.
And that's it folks. This engine is done. Look for it listed in the finished engine section (running on both compress air and steam...I hope on steam.)