You may imagine that you will have this to do often. Well don't be
scared about it. You may run an engine a long time, and never have to
set a valve. I have heard these windy engineers (you have seen them),
say that they had to go and set Mr. A's or Mr. B's valve, when the facts
were, if they did anything, it was simply to bring the eccentrics back
to their original position. They happened to know that most all engines
are plainly marked at the factory, and all there was to do was to bring
the eccentrics back to these marks and fasten them, and the valve was
set. The slipping of the eccentrics is about the only cause for a valve
working badly. You should therefore keep all grease and dirt away from
these marks; keep the set screws well tightened, and notice them
frequently to see that they do not slip. Should they slip a I/I6 part
of an inch, a well educated ear can detect it in the exhaust. Should
they slip a part of a turn as they will some times, the engine may stop
instantly, or it may cut a few peculiar circles for a minute or two, but
don't get excited, look to the eccentrics at once for the trouble.
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