Cut off a piece of steel rod of the proper
length and unsolder the ends. The rod pieces must then be assembled on the
rod, and with it be centred on the paper and held in position while the
parts are soldered together.
OTHER DETAILS.
Adjusting the Guides.--Put the connecting rod in place on its pins, and
revolve the crank until the guides have taken up that position which allows
the crosshead to move freely. Then mark off the holes for the guide
holding-down screws, and drill and tap them.
Packings.--The glands and piston should be packed with asbestos string.
Don't be afraid of packing too tightly, as the tendency is for packing to
get slacker in use. The rear end of the cylinder should be bevelled off
slightly inside, to allow the packed piston to enter easily.
Joints.--The cylinder head and valve chest joints should be made with
stout brown paper soaked in oil or smeared with red lead. All screw holes
should be cut cleanly through the paper, and give plenty of room for the
screws.
[Illustration: FIG. 66.-Vertical section of force pump driven by engine.]
When making a joint, tighten up the screws in rotation, a little at a time
so as not to put undue strain on any screw.
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