Very exciting report. I have restored a few big model steam engines and
have seen many issues. The Screw underside of the Cylinder may be an
inspection hole for perfect adjusting the position of the piston or it is just a
train hole if you storage for longer time. Often these old engines have
all steel Cylinder, Piston, Connecting Rod and the rust is not far away
if there is not a perfect maintenance after use. The Slider must be free
floating and will be pressed to the surface by the steam - never mount too
tightly. Im am sure, that the rough run comes from inaccuracy of the Piston,
Piston rings, Cylinder, Stuffing box and Connecting Rod and TIMING. All others
like bearings etc. are not so important. Straightforwardness is the solution.
Hope you will get it to a smooth running - after all the engine is in a good
condition to restore. The Cylinder cover has to be made from scratch - that will
be an other nice job.
good luck, Arnold
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