I know that it is a common custom
in the field to bring the engine to a center by the use of the eye. You
may have a good eye, but it is not good enough to depend on for the
accurate setting of a valve.
HOW TO FIND THE DEAD CENTER
First, provide yourself with a "tram." This you can do by taking a 1/4
inch iron rod, about 18 inches long, and bend about two inches of one
end to a sharp angle. Then sharpen both ends to a nice sharp point.
Now, fasten securely a block of hard wood somewhere near the face of the
fly wheel, so that when the straight end of your tram is placed at a
definite point in the block the other, or hook end, will reach the crown
of fly wheel.
Be certain that the block cannot move from its place, and be careful to
place the tram at exactly the same point on the block at each time you
bring the tram into use. You are now ready to proceed to find the dead
center, and in doing this remember to turn the fly wheel always in the
same direction. Now, turn your engine over till it nears one of the
centers, but not quite to it. You will then, by the aid of a
straight-edge make a clear and distinct mark across the guides and cross
head.
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