![]() ![]() Rules for Timing Locomotives with Walschaert Gear This condition is also a must for checking the length of eccentric rod (2) and position of the eccentric crank (1). If the radius of the link was not equal to this distance, it would be impossible to move the radius rod from top to bottom of the link without moving the valve and it must be possible to do this without moving the valve for accurate valve setting. The radius of the expansion link is the length of the radius rod measured from the center of its connection at the combination lever, to the center of the bearing on which the link swings. In most layous of Walschaert gear, the expansion link is located approximately halfway between the centers of the main driving axle and the valve stem guide (10), to which the combination lever (12) is attached. With Walschaert valve gear the length of the radius rod (8) and the eccentric rod (2) is dependent on the fore and aft location of the expansion link (7).
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