Full floating piston pins allow motion between the pin and which components?

Full floating piston pins allow motion between the pin and which components?

• A. The piston and the crankshaft
• B. The piston and the large end of the connecting rod
• C. The piston and the small end of the connecting rod
• D. The pin and the engine block

Answer: (C)

Full-floating piston pins are not fixed to either the piston or the connecting rod. They pass through the piston boss and the small end of the connecting rod and are retained, but they can rotate and slide relative to both parts. This design lets the pin move as the piston and rod articulate during the engine cycle, making the interface between the pin and the piston and the pin and the small end of the rod the key points of relative motion. The crankshaft and engine block aren’t what the pin slides against, and the large end of the rod is connected to the crank rather than the pin itself.

Full-floating piston pins are not fixed to either the piston or the connecting rod. They pass through the piston boss and the small end of the connecting rod and are retained, but they can rotate and slide relative to both parts. This design lets the pin move as the piston and rod articulate during the engine cycle, making the interface between the pin and the piston and the pin and the small end of the rod the key points of relative motion. The crankshaft and engine block aren’t what the pin slides against, and the large end of the rod is connected to the crank rather than the pin itself.