After a long period of operation, a wear ridge, caused by piston ring action, will develop near the top of the cylinder liner. This ridge must be removed during maintenance in order to prevent __________.
• Piston ring travel and wear ridge location in a cylinder liner • What happens to rings and ring lands when they hit a solid step during movement or when removing a piston • Effects of a ridge on initial seating and lubrication of new rings
• Visualize pulling a piston with its rings past a sharp metal step at the top of the cylinder. What parts are most at risk of physical damage? • Ask yourself: does a ridge mainly affect how much oil gets to the ring, or does it mainly create a mechanical obstruction or impact? • During normal operation versus piston removal, when is the contact with the ridge most severe and sudden for the rings?
• Identify which option describes mechanical damage caused by hitting a hard ridge • Separate options that talk about lubrication or seating quality from those that describe physical breakage or impact • Confirm which choice clearly involves damage to rings and ring lands during piston withdrawal past the ridge
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