🔍 Key Concepts

• Piston ring function in sealing combustion gases and controlling oil • Why incorrect ring end conditions can cause cylinder damage or loss of compression • Standard pre‑installation checks recommended by diesel engine manufacturers

💭 Think About

• Which ring characteristic most directly affects how it will expand when heated inside the cylinder and how it fits into the ring groove? • If the ring is too tight in this particular way, what happens when it expands under operating temperature? • Which of these options is normally measured by placing the ring alone in the cylinder bore and using a feeler gauge?

✅ Before You Answer

• Verify which parameter is specifically checked with the ring set squarely in the cylinder bore, not on the piston. • Confirm which option is directly related to allowing for thermal expansion of the ring ends. • Eliminate any choices that are usually factory‑controlled dimensions rather than a normal mechanic’s pre‑installation check.