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51. You are analyzing the data used for trend analysis for a two-stroke main propulsion diesel engine on your river push boat. Although the engine has yet to experience a safety shutdown on high crankcase pressure, over time the crankcase pressure (which normally runs in a vacuum) has gradually become less negative. Which of the following failures would most likely be responsible for this condition?
Gradual reduction in crankcase vacuum, which is normally a vacuum, is most likely caused by worn piston compression rings, which increase combustion gas leakage into the crankcase over time.
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