This should be done after you have set the set screws in
eccentric down solid on the shaft. Then, at any time should your
eccentric slip, you have only to bring it back to the chisel mark and
fasten it, and you are ready to go ahead again.
This is for a plain or single eccentric engine. A double or reversible
engine, however, is somewhat more difficult to handle in setting the
valve. Not that the valve itself is any different from a plain engine,
but from the fact that the link may confuse you, and while the link may
be in position to run the engine one way you may be endeavoring to set
the valve to run it the other way.
The proper way to proceed with this kind of an engine is to bring the
reverse lever to a position to run the engine forward, then proceed to
set your valve the same as on a plain engine. When you have it at the
proper place, tighten just enough to keep from slipping, then bring your
reverse lever to the reverse position and bring your engine to the
center. If it shows the same lead for the reverse motion you are then
ready to tighten your eccentrics securely, and they should be marked as
before.
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