Drive Pin InstallationSaturday, December 2, 2017 by MC
On Saturday we met at K Manufacturing to install the new drive pins into the driver wheelsets. John had ordered a Dewar of liquid nitrogen (LN2) to be used to cool the pins and shrink them so they could be inserted into the cast steel wheels. The pins which were machined to the same diameter as hole in the wheel, were immersed in the LN2 until they had shrunk about 0.005" in diameter. This allowed them to be slid into place. They then expand to fill the hole as they warm. There is a 1/4in flange on the bottom of the pin that will be peened over (on the inside of the wheel).
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