Which outcome occurs when an internal combustion engine's piston experiences excessive thermal stress due to coolant failure?

💡 Explanation

When a piston endures excessive thermal stress from coolant loss, thermal expansion exceeds material limits, initiating fatigue cracking at stress concentration points like valve reliefs. Therefore piston crown cracking results, rather than bearing failure, injector clogging, or impeller damage which arise from oil degradation or fuel issues.

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