THE CYLINDER AND CYLINDER PACKING.
The old fashioned packing rings are perhaps, all things considered,
the most reliable cylinder packing in use, and the exceptions to the cases
in which they will answer all purposes are very few. Where the cylinder
is round and smooth, the packing rings should be turned in the cylinder,
and when the packing is set, once in every four or six weeks, it is essential
that the packing rings should be kept clean. When the steam begins to "blow
through," as it is termed, or pass between the rings and follower-head,
the rings should be taken out and cleaned, and the defect will generally
be remedied. The blowing maybe detected by a close examination when the
follower-head is off. Should the cleaning not be effectual, however, it
will be necessary to grind in the rings, to do which, the piston must be
taken out of the cylinder, and placed in a clamp or vise. The bottom rings
are then to be ground to the back follower-head, the top ring to the bottom
ring, and the follower-head
to the top ring. Cylinder packing should be ground as little as possible,
consistent with securing a good bearing upon the follower-heads and rings.
In order to try them after they have all been ground in, the rings should
be placed on the follower-head, and the latter screwed down hard. Then
by tapping the rings with a hammer handle it will be ascertained whether
they are loose enough to move quite freely. Should they bind they must
be ground still more until they work with entire ease.
1 - Introduction
2 - Locomotive
3 - The Fireman
4 - Advice to Young Engineers
5 - Tramming and Center Marking
6 - Adjusting Side and Main Rods
7 - Pumps and Pump Valves
8 - Cylinder and Cylinder Packing.