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 marker, 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.