🔍 Key Concepts

• Function of an oil scraper ring in a diesel engine piston • How oil returns from the cylinder wall to the crankcase/sump • Difference between ring flexibility, thermal expansion gaps, and oil control features

💭 Think About

• Think about what an oil scraper ring is supposed to do to the oil film on the cylinder liner during the piston's stroke. • Consider where the unwanted excess oil should go after it is scraped off the liner by this ring. • Ask yourself: do slots mainly affect side thrust, flexibility, expansion, or the path for oil movement?

✅ Before You Answer

• Identify the primary job of an oil scraper ring compared with compression rings. • Check which option specifically provides a pathway for oil rather than just changing ring shape or stress. • Make sure the choice you select directly connects to controlling and routing excess lubricating oil rather than general mechanical behavior.