The brasses on wrist pin and
cross-head will probably require your first and most careful attention,
and of these two the wrist or crank box will require the most; and what
is true of one is true of both boxes. It is, therefore, not necessary
to take up both boxes in instructing you how to handle them. We will
take up the box most likely to require your attention. This is the
wrist box. You will find this box in two parts or halves. In a new
engine you will find that these two halves do not meet on the wrist pin
by at least one-eighth of an inch. They are brought up to the pin by
means of a wedge-shaped key. (I am speaking now of the most common form
of wrist boxes. If your engine should not have this key, it will have
something which serves the same purpose.) As the brasses wear you can
take up this wear by forcing the key down, which brings the two halves
nearer together. You can continue to gradually take up this wear until
you have brought them together. You will then see that it is necessary
to do something, in order to take up any more wear, and this "something"
is to take out the brasses and file about one-sixteenth of an inch off
of each brass.
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