Piston rings are replaced on the cylinder unit of a medium or slow speed diesel engine. All measurements of the cylinder liner and piston are within limits, as is condition of intake/exhaust valves. What is the end result of the ring replacement?
• Function of piston rings in diesel engines (compression sealing, oil control, heat transfer) • Difference between compression ratio (geometric, based on engine design) and compression pressure (actual pressure achieved in operation) • Relationship between ring condition and wear of cylinder liner over time
• Think about what changes physically when you only replace piston rings, but all liner, piston, and valves are already within limits. Does the basic engine geometry change? • Which of the listed effects would be seen immediately after correct replacement and break-in of new rings, and which would be more of a long-term effect? • How does improved sealing of the combustion chamber affect pressures and engine performance, assuming all other parts are in good condition?
• Verify whether compression ratio depends on moving parts clearances or on fixed engine geometry (bore, stroke, clearance volume). • Check which choice refers to a long-term wear effect rather than a direct, immediate result of proper ring renewal. • Confirm how restored ring sealing would influence compression test readings and overall thermal efficiency in the short term.
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