What is engine wrist pin?

The engine wrist pin, also known as piston pin or gudgeon pin, is a cylindrical metal component that connects the piston to the connecting rod in an internal combustion engine. The wrist pin is located inside the small end of the connecting rod and the piston's top end and is designed to pivot on the axis during the up-and-down motion.

The wrist pin's function is to keep the piston properly oriented during the firing stroke and to prevent the piston from becoming dislodged from the connecting rod. It also helps to transmit the force generated by the combustion of fuel to the connecting rod and crankshaft.

Wrist pins are typically made of hardened steel or titanium to withstand the forces and heat generated by the engine. They come in different diameters and lengths depending on the engine's size and performance requirements. Worn or damaged wrist pins can result in engine problems, including decreased power, increased noise, and decreased fuel efficiency. Regular engine maintenance and component inspections can help identify and address any potential wrist pin issues.