🔍 Key Concepts

• Function of piston compression rings in a diesel engine (sealing, heat transfer, oil control) • How cylinder lubrication affects deposits and ring movement • What conditions can cause rings to stick in their grooves (carbon, varnish, sludge)

💭 Think About

• Think about which option would most likely cause buildup of deposits that could glue the ring into its groove. • Which choice would increase the chance that oil and contaminants collect and harden around the ring instead of being swept away? • Consider whether each option would make the ring move more freely or restrict its free movement in the ring groove.

✅ Before You Answer

• For each choice, ask: does this condition promote carbon or sludge deposits around the ring? • Recall that compression rings must move freely in their grooves to seal properly—what would prevent that? • Be sure you understand the difference between mechanical action of the ring (movement) and lubrication amount/quality before choosing.