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SP&S #273
Astoria RR
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Installing Crown Stays
Saturday, March 15, 2014 by MCAll winter and into the spring we have been installing crown stays in the boiler. As noted previously, the crown stays have tapered threads on the firebox end. This requires reaming the hols with a tapered reamer, then tapping with a tapered tap, and finally threading the staybolt up into place. To complicate matters, the bolts vary in length depending upon their position. This required measuring each of the holss and working out a matrix for length and position of each of them. In addition, those at the front end of the firebox are flexible stays, requiring the manufacture and placement of a ball nut on the upper end to fit in the cup and permit flexing.
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