Which risk increases when the wastegate in a turbocharged diesel engine fails closed during high load operation?

💡 Explanation

When the wastegate fails closed under high load, the turbocharger continues to increase boost pressure because it's not being bypassed, possibly causing over-boost and high cylinder pressures/temperatures, raising thermal stress. Therefore excessive cylinder head thermal stress increases, rather than lean mixture or other failure which doesn't involve high temps.

• Which heat transfer impairment results when desuperheating in a refrigeration cycle falters?
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• Which consequence results when excessive vibration occurs, exceeding a reinforced concrete beam's damping capacity?
• Which outcome occurs when a fiber optic transceiver's clock recovery circuit experiences excessive jitter?
• Which consequence results when inadequate core cooling occurs in a high-power electrical transformer?
• Which unintended consequence occurs when using leading-edge vortex generators on aircraft wings at high angles of attack near stall?