Why dose any diesel engine smoke black?

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Black smoke indicates that the fuel is not burned properly. The internal combustion process in diesel cars requires a certain mixture of fuel and air. ... This faulty process forms solid carbon residue, which causes a black smoke from the exhaust of the diesel engine when accelerating your car.

over-fueling is the primary cause of black smoke from the exhaust of a heavy duty diesel engine.  Excessive oil consumption due to worn valves and valve stem seals, worn or stuck/sluggish rings from deposits, and worn cylinder liners contribute to black smoke.

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the army does care about its soilders sir i think yout getting off on the wrong foot sir you need to respect our country were keeping the peole that want to d harm towards you out. so dont go saying we don't care cause we do