What is the role of the scraper ring in the piston ring pack?

What is the role of the scraper ring in the piston ring pack?

• A. Seals combustion gas.
• B. Scraper and oil control rings regulate oil and provide lubrication retention.
• C. Provides structural support for the piston.
• D. Acts as a piston pin retainer.

Answer: (B)

The scraper ring is part of the oil control portion of the piston ring pack. Its job is to scrub excess lubricating oil off the cylinder wall as the piston moves, helping to keep oil from flooding the combustion chamber. It works with the rest of the oil control ring assembly to regulate the oil film on the wall and to retain lubrication where it’s needed, returning the excess oil to the crankcase. This combination minimizes oil consumption and ensures the rings and piston skirt stay properly lubricated.

The scraper ring is part of the oil control portion of the piston ring pack. Its job is to scrub excess lubricating oil off the cylinder wall as the piston moves, helping to keep oil from flooding the combustion chamber. It works with the rest of the oil control ring assembly to regulate the oil film on the wall and to retain lubrication where it’s needed, returning the excess oil to the crankcase. This combination minimizes oil consumption and ensures the rings and piston skirt stay properly lubricated.