What component keeps the piston rings in their correct position?

• A. Grooves
• B. Lands
• C. Piston crown
• D. Piston pin

Answer: (A)

Ring grooves cut into the piston are what keep the piston rings in their seats. The rings are placed in these grooves, which locate and retain them as the piston moves in the cylinder, maintaining proper sealing and allowing for controlled expansion with heat. The lands—the surfaces between grooves—provide a backing surface for the rings and help define the sealing area, but the actual positioning mechanism is the grooves themselves. The piston crown is the top surface that seals the combustion chamber and doesn’t position the rings, while the piston pin connects the piston to the connecting rod and has no role in ring placement.