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Installing Crown Stays
Tapered tap inserted in the crown of the firebox

Installing Crown Stays

Saturday, March 15, 2014

After the hole in the crown of the firebox has been reamed with the tapered reamer it is threaded with a tapered tap. In this picture the tap has been inserted (lead threads are threaded up into the already threaded hole in the boiler). At this point a little cutting oil and a bit of brute strength enable us to cut the threads. You can see an orange mark on the tap which is used as an indicator of how deep to cut the threads. This depth is critical as about 1/4 inch of the staybolt must be left exposed so that it can bee peened over. Note the staybolt that have already been placed (the hex head is used to insert the staybolt and will be cut off before peening).

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Astoria Railroad Preservation Association
P.O. Box 541
446 W. Marine Dr.
Astoria, Oregon 97103
(503) 325-5323

An Educational Non-Profit Corporation
Dedicated to Promoting Public Awareness of Railroad History
Through the Preservation and Operation of Vintage Railway Equipment.

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