Wait an hour or two, and go
round with the screw-driver again.
Lubrication.--When the engine is first put under steam, lubrication
should be very liberal, to assure the parts "settling down" without undue
wear.
The Pump.--Fig. 65 shows in section the pump, which will be found a
useful addition to the engine. (For other details, see Figs. 53 and 54.)
Its stroke is only that of the eccentric, and as the water passages and
valves are of good size, it will work efficiently at high speed. The method
of making it will be obvious from the diagrams, and space will therefore
not be devoted to a detailed description. The valve balls should, of
course, be of gun-metal or brass, and the seatings must be prepared for
them by hammering in a steel ball of the same size.
In practice it is advisable to keep the pump always working, and to
regulate the delivery to the boiler by means of a by-pass tap on the feed
pipe, through which all or some of the water may be returned direct to the
tank.
The tank, which should be of zinc, may conveniently be placed under the
engine. If the exhaust steam pipe be made to traverse the tank along or
near the bottom, a good deal of what would otherwise be wasted heat will be
saved by warming the feed water.
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