Suppose
the steam blows out of one cock all right, and when we bring the engine
to the other center no steam escapes from this cock, then we know that
something is wrong with the valve, and if the eccentrics are in their
proper position the trouble must be in the steam chest, and if we open
it up we will find the valve has become loosened on the rod. Again
suppose we put the engine on a center, and on giving it steam, we find
the steam blowing out at both cocks.
Now what is the trouble, for no engine in perfect shape will allow the
steam to blow out of both cocks at the same time. It is one of two
things, and it is difficult to tell. Either the cylinder rings leak and
allow the steam to blow through, or else the valve is cut on the seat,
and allows the steam to blow over. Either of these two causes is bad,
as it not only weakens your engine, but is a great waste of fuel and
water. The way to determine which of the two causes this, is to take
off the cylinder head, turn engine on forward center and open throttle
slightly. If the steam is seen to blow out of the port at open end of
cylinder, then the trouble is in the valve, but if not, you will see it
blowing through from forward end of cylinder, and the trouble is in the
cylinder rings.
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