The Bolton 9 engine is assembled, almost completely. The valves are approximately correctly timed. I can turn it over by hand, just. There are a few tight spots.
So today I mounted the entire engine in a lathe, oiled all bearings and slides, and tentatively ran it for a few minutes. The lathe was set at 60rpm, in back gear.
All seemed OK, so I ran it for about 30 minutes. Then increased the rpm to 90 for another 30 minutes. After that the tight spots still exist, but much less pronounced.
I kept a check on bearing temperatures with a laser thermometer, and none were running more than a degree or two different from any others.
The test did show that a low pressure cylinder drag link is touching the condenser, and will need some relief. Also the high pressure cylinder eccentrics need to be repositioned a little on the crankshaft. But nothing major. And it was very nice to see everything moving in quite an impressive manner.
I will upload a video when the upload speeds are reasonable.