You should be very
careful not to get your box too tight, and don't imagine that every time
there is a little knock about your engine that you can stop it by
driving the key down a little more. This is a great mistake that many,
and even old engineers make. I at one time seen a wrist pin and boxes
ruined by the engineer trying to stop a knock that came from a loose
fly-wheel. It is a fact, and one that has never been satisfactorily
explained, that a knock coming from almost any part of an engine will
appear to be in the wrist. So bear this in mind and don't allow
yourself to be deceived in this way, and never try to stop a knock until
you have first located the trouble beyond a doubt.
When it becomes necessary to key up your brasses, you will find it a
good safe way to loosen up the set screw which holds the key, then drive
it down till you are satisfied you have it tight. Then drive it back
again and then with your fist drive the key down as far as you can. You
may consider this a peculiar kind of a hammer, but your boxes will
rarely ever heat after being keyed in this manner.
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