On a slow-speed diesel engine vessel you are supervising a routine piston pull on a cylinder with 10000 hours on the liner. The piston rod is disconnected. Why must the ridge on the liner be removed before lifting the piston?
• Cylinder liner wear patterns in slow-speed diesel engines • Effect of a wear ridge on piston rings and lands during removal • Relationship between piston travel and the untouched top of the liner
• Think about how the piston moves in the liner during normal operation. Does it ever reach the very top where the ridge forms? • What happens to the piston rings and ring lands if they are pushed past an area of the liner that has not worn with the rest of the bore? • Which option correctly describes what the ridge actually is, versus parts of other systems like exhaust ports or piston crowns?
• Verify what causes the ridge at the top of a cylinder liner in a slow-speed diesel. • Check whether the ridge is part of the liner material itself or part of another engine component like exhaust vents, trunks, or the piston crown. • Confirm which component would be damaged during piston removal if the wear ridge is not removed.
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