Engineering · Diesel — Performance
A sudden DROP in exhaust temperature on one cylinder of a multi-cylinder diesel most likely indicates:
- AOverload on that cylinder
- BThat cylinder is not firing / not receiving fuel✓ Correct
- CExcess cooling-water flow only
- DNormal balanced operation
Explanation
A cylinder that stops firing (failed injector, fuel pump, or stuck valve) produces little heat, so its exhaust temperature falls noticeably below the others.
Authority: Diesel Engines (USCG engineering topic)
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