arker, and tighten up set-screws. To set a
go-ahead eccentric, use the back-up one on that side for the marker. If
the eccentric had been keyed on, would move the cam until the key-way in
the axle came in line with the slot in the cam. Knowing the position of
the eccentric in relation to the crank pin, an inspection would show
where it belongs. The eccentrics are usually opposite the third spoke in
the driving wheel from the pin, sometimes ahead of the pin, in other
cases back of the pin, depending on whether it is an inside or outside
admission valve, a go-ahead or back-up eccentric.

63. Q. What should be done in case of a broken eccentric strap or rod?

A. For a go-ahead strap or rod take down all broken parts, disconnect
valve rod, cover ports, and come in on one side. It is safer to take
down also the back-up strap and rod on that side. If the back-up strap
and rod is broken, it is possible to secure the bottom end of the link
so it will not turn over, work the engine full stroke ahead, proceeding
with full train until the main line is clear.

64. Q. How should the engine be disconnected if the lower rocker arm
became broken? If link block pin?

A. Would remove broken parts; if moving link would strike anything
connected with the rocker box or broken arm it would be necessary to
take down both eccentric straps and rods. Block valve central over ports
and come ahead on one side. If a link block pin was broken, it might be
possible to put a bolt in there to do the work, otherwise block the
valve on the center of its seat and if the link will not clear the lower
end of the rocker arm take down the eccentric straps and rod. In any
case where necessary to take off the eccentric rod always take off the
strap also.

65. Q. For what breakdown is it necessary to take down the main rod? The
side rod?

A. A broken main crank pin, broken main rod or strap, broken piston rod
when near the middle of the rod, broken cross-head or guide, broken
valve or seat when steam cannot be kept out of the cylinder. Side rods
must come down for broken side rod, broken main pin, or broken side rod
pin affecting that rod.

66. Q. If it is not necessary to take down the main rod of disabled side
of the engine, how would you arrange to lubricate the cylinders?

A. If cylinder and piston are in good shape and it is possible to block
the valve to admit a small quantity of steam into the back end of the
cylinder, oil from the lubricator wil