Why is diesel smoke black?

Answer

The black smoke that arises from a diesel motor is actually unburnt diesel fuel. There are many different causes of black smoke that can include over-fueling, dirty or worn injectors, poor fuel quality, incorrect valve clearance, and potentially more. Black smoke is the most common smoke to come from diesel engines.
Q&A Related to "Why is diesel smoke black?"
A common cause for a diesel truck to produce excessive amounts of black smoke is a dirty air filter. The air inlet is restricted which means there is not enough air entering the engine
http://www.ehow.com/list_7574696_causes-black-smok...
Black smoke is usually too much fuel or not enough air It may be as simple as a dirty air filter. Start with the easy stuff first. Good luck!
http://wiki.answers.com/Q/What_cause_black_smoke_i...
The black smoke says you aren't getting enough
http://www.chacha.com/question/why-does-a-diesel-t...
To get a Ford diesel to pump black smoke, users suggest getting bigger injectors or stacking them.
http://www.kgbanswers.com/how-to-get-a-ford-diesel...
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