Piston Pin

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Piston pin joins the piston to the connecting rod, machined in the form of a tube from a nickel steel alloy forging, casehardened and ground.
Piston pin (wrist pin) used in modern aircraft engines is the full-floating type, so called because the pin is free to rotate in both the piston and in the connecting rod
piston-pin bearing. 
Piston pin must be held in place to prevent the pin ends from scoring the cylinder walls.
 A plug of relatively soft aluminum in the pin end provides a good bearing surface against the cylinder wall.

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