r for a slide valve; or taking off front head for a piston
valve. Disconnect the valve rod from rocker arm and block valve stem so
it cannot blow out of the gland or let valve work back. Loosen cylinder
head in order to provide for lubricating cylinder so as to leave the
main rod up on the disabled side and proceed on one side. If unable to
cover the open steam port it would be necessary to disconnect the main
rod on the disabled side, blocking the piston at the proper end of the
guides so live steam coming into the cylinder would not move it.

57. Q. If a slide valve is broken, what can be done to run the engine on
one side?

A. Remove the steam chest cover, place a thin board between the valve
and the steam passages in the seat, replace steam chest cover,
disconnect valve rod, and if able to lubricate the cylinders leave up
the main rod and proceed on one side.

58. Q. If one of the bolts connecting the two parts of a built-up link
on Stephenson gear breaks or is lost, how would you proceed?

A. If temporary bolt cannot be supplied, take down the forward part of
the link, disconnect and remove link block, fasten valve to cover ports,
and proceed. If moving link will clear rocker arm or other parts of the
machinery after link block is taken out, it will not be necessary to
disconnect eccentrics.

59. Q. What should be done in case of link saddle pin breaking?

A. Remove the broken parts and block the disabled link in such a
position that the entire train could be started, using a very short
block above the link block in the link slot and a longer one below it.

60. Q. With one link blocked up, what should be guarded against?

A. Reversing the engine or moving the tumbling shaft arm down so the
link on the disabled side can strike it.

61. Q. How can it be known if an eccentric has slipped on the axle?

A. By the uneven exhaust of the engine and a thorough inspection to
determine the cause.

62. Q. Having determined which eccentric has slipped, how should it be
reset?

A. Place the engine on the center on disabled side and if a back-up
eccentric has slipped, would place the reverse lever in full forward
gear and mark the valve stem flush with the gland; then place the
reverse lever in full back gear and move the slipped eccentric until the
mark on the stem returns to its original position, taking notice that
the throw of the eccentric is on the other side of the axle from the
go-ahead eccentric used as a m