Which risk increases when cylinder head temperature rises excessively leading to piston expansion in an internal combustion engine?

💡 Explanation

When cylinder head temperature rises excessively, piston expansion occurs reducing the intended clearance because the aluminum expands faster than the steel cylinder liner, potentially leading to piston seizure. Therefore, piston seizure results, rather than effects such as decreased viscosity, pre-ignition, or increased fuel consumption, requiring alternative thermal effects.

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