Which risk is amplified if a turbocharged engine's exhaust gas recirculation (EGR) valve fails open?

💡 Explanation

When the EGR valve fails open, excessive hot, oxygen-depleted exhaust gas enters the intake manifold mixing with fresh air, leading to a high exhaust dilution increases cylinder temperature, thus raising the likelihood of pre-ignition. Therefore pre-ignition due to higher temperatures results, rather than other failures, which need distinctly different root causes.

• Which outcome occurs when excessive thermal stress weakens a marine diesel engine crankshaft?
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• Which risk increases when transformer oil undergoes prolonged thermal stress in a high-voltage substation?