Hey all from a long-time reader and learner!  With the discussion
earlier this year about rebuilding the sliding valves on an air motor,
it occurred to me that I haven't seen anything related to _adjusting_
the valves, and thought I'd get input.

My old (December 1910) Aeolian player piano has a 3-valve air motor.
About five years ago one of the wooden upright members holding the
crankshaft broke.  I was able to get new ones made, and while
reassembling it I seem to have messed up the alignment of the three
sliding valves.

On this air motor, the wood valves are connected to the rods on the
crankshaft, and have small adjusting wood knobs on threads.  Twisting
the knobs raises or lowers the sliding valve.

So, after getting the wood support in, I must have twisted or
messed with these knobs, as the motor started making a 'click' sound
once a revolution, with a barely-noticeable pause in crank motion.
My question, and one I have not been able to find online, is how do
I get these sliding valves back to a good position?

Yes, the motor was rebuilt about 15 years ago.  After going through
two climate moves and a long string of non-playing, I believe it's time
for another rebuild.  I'd like to at least temporarily get it up and
running well enough to play a roll before having to find someone to
help rebuild it.

Cheers,

Mike Morrey

 [ MMD articles on this topic are indexed at
 [ http://www.mmdigest.com/Archives/KWIC/T/timing.html 
 [ and http://www.mmdigest.com/Archives/KWIC/R/rebuilding.html 
 [ -- Robbie