During combustion, the sealing surfaces of a...

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Question 1 of 205eccefa1bacbc34ba4d47541

During combustion, the sealing surfaces of a diesel engine piston ring are considered to be the ring area in contact with the cylinder wall, in addition to the ring area in contact with the ring groove __________.

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🔍 Key Concepts

• Gas pressure path from combustion space to piston ring land and cylinder wall • How piston rings transfer combustion force to the piston through their contact surfaces • Difference between ring contact surfaces: top/bottom faces, back face, side (radial) face

💭 Think About

• Think about which ring surface actually passes combustion pressure from behind the ring to push it outward against the cylinder wall. • Visualize where carbon and wear marks appear on a ring that has been in service—what does that tell you about which faces are sealing during firing? • Which surface, if leaking, would most directly reduce the gas pressure that forces the ring against the liner?

✅ Before You Answer

• Identify which ring face is toward the piston land/combustion space and which face is toward the crankcase. • Consider how gas gets behind the ring to press it outward—through which gap or edge? • Verify which contact surfaces are normally described together when discussing ring gas sealing area in diesel engine texts.

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