🔍 Key Concepts

• Cylinder liner function in a diesel engine • Effect of scoring (grooves/scratches) on sealing between piston, rings, and liner • Relationship between ring/liner condition and compression, blow-by, and lubrication

💭 Think About

• Think about what happens to the seal between the piston rings and liner when the liner surface is damaged or grooved. • How would damaged liner surfaces affect the movement and wear of piston rings as they slide up and down? • Which option describes a direct mechanical consequence of poor sealing and rough surfaces, rather than a secondary system effect like cooling water or peak pressure?

✅ Before You Answer

• Verify which choices deal with direct wear of moving parts versus changes in operating conditions (pressure, temperature). • Ask yourself: does liner scoring act more on the rings and cylinder seal, or on the cooling water side of the liner? • Eliminate any choice that would require a leak path across the liner wall (from combustion space to cooling water) and consider if scoring alone can realistically cause that.