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Which failure mode is accelerated when rapid diesel combustion overheats pistons?

A)Piston ring groove micro-welding
B)Pre-ignition knocking sensitivity increases
C)Cylinder head bolt fatigue failure
D)Connecting rod bearing oil starvation

💡 Explanation

Piston overheating during rapid combustion causes localized melting and material transfer to the piston rings through micro-welding, a form of adhesion, because temperature increases exceed the material's yield strength. Therefore, ring-groove failure accelerates, rather than increased knock, head bolt fatigue, or distant bearing concerns.

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