Answer :
Final answer:
Piston rings should be checked for their fit in both the piston ring grooves and the cylinder to ensure optimal engine performance and longevity.
Explanation:
Piston rings should be checked for fit both in the piston ring grooves and in the cylinder. The rings play a critical role in sealing the combustion chamber, controlling oil consumption, and regulating heat transfer from the piston to the cylinder wall. To ensure proper fit in the grooves, rings should not be too tight or too loose; they should fit snugly but still be able to move freely. For checking in the cylinder, a ring should be inserted into the cylinder bore and a feeler gauge used to measure the gap in the ring. This is to ensure that there is adequate end gap and the rings can expand when the engine warms up without causing issues like scuffing or breaking.
