Running in the Triple Expansion Engine

by John

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.