A well - maintained diesel engine emits negligible amount of carbon monoxide and hydrocarbons though considerable amount of nitrogen oxides are emitted. Diesel smoke is another pollutant incase of diesel engines. The diesel smokes are of two types
(1) White smoke, and
(2) Black smoke .
The white smoke normally arises due to
( i ) Too low operating temperature.
(ii) Too long delay between the start of the fuel injection and beginning of combustion.
White smoke appears during starting and warming up. The black smoke appears after the engine has fully warmed up and accelerating or pulling under load. The black smoke is a suspending of soot particles in the exhaust gases. It results incomplete combustion of fuel. Blue smoke occurs due to excessive lubricating oil consumption. Its emission indicates a very poor condition of the engine, such as worn-out piston rings or valve guide etc. The blue smoke is not considered as a serious pollution.
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