The Nissan Xterra Piston experiences the pressure of the burning gases inside the engine, converting it into rotary motion to turn the wheels. The component, which moves vertically in the cylinder, uses its Piston rings to create a seal between its surface and the cylinder wall to contain pressure and manage oil control. A wrist pin connects the Piston to a connecting rod, which transforms the Piston's reciprocating stroke into rotary movement at the crankshaft that drives the transmission and axle shafts. Factory units are made from lightweight aluminum alloy, cast or forged to provide strength and heat resistance. In applications such as Xterra marketed by Nissan, the Piston needs to withstand prolonged high temperatures while being lightweight. The rings may be made from ductile iron, steel, or cast iron, depending on position, and may have coatings such as plasma moly or chrome to resist wear and reduce friction. Various designs use floating pins that are held by clips. The treatment on the skirt surface can reduce scuffing and reflect heat that helps in the durability of the Nissan Xterra powertrain. The reliability of the Nissan Xterra for use under various driving circumstances is important.
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