1The material used for the Liberty engine piston pin was S. A. E. No.
2The piston pin on an aviation engine must possess maximum resistance to wear and to fatigue.
3The finish heat treatment of the piston pin consisted in quenching in oil from a temperature of from 1,525 to 1,575°F.
4Hollow connecting-rods are used, and the lubricating oil for the piston pins passes from the crankshaft through the centres of the rods.
5After this quenching, all piston pins are tempered in oil at a temperature of from 375 to 400°F.
Translations for piston pin