Which outcome occurs when fuel injectors in a diesel engine experience prolonged operating temperatures above design limit?

💡 Explanation

When diesel fuel injectors overheat, thermal expansion and varnish buildup cause the needle valve to stick because clearances are reduced and fuel thermal breakdown creates residue, leading to fuel starvation. Therefore, injector needle valve sticking results, rather than bearing failure, particle increase, or crankshaft wear which require different root causes.

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