Final answer:
The most common method to secure a full-floating piston pin in the piston is using a clip, specifically a circlip or G-clip, which allows necessary movement while preventing the pin from sliding out.
Step-by-step explanation:
To secure a full-floating piston pin in the piston of an engine, the most common method used is a clip. A full-floating piston pin should have the freedom to move both within the piston boss and the connecting rod's eye. This movement reduces stress and wear in high-performance engines.
The pin is typically held in place using a circlip or G-clip inserted into a groove at each end of the piston pin's surface. This type of retention prevents the pin from sliding out and damaging the cylinder wall while allowing it the necessary freedom of movement.