Which risk increases when lubricating oil supply to internal combustion engine crankshaft bearings is interrupted?

💡 Explanation

When oil supply is interrupted, boundary lubrication occurs in the crankshaft bearings which results in increased friction and heat, leading to excessive stress cycling, creating micro-cracks that propagate into metal fatigue and eventual failure. Therefore, crankshaft journal fatigue increases, rather than blow-by, head gasket failure, and valve seizure which relate to cylinder/valve issues rather than lubrication to rotating components.

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