Observe the "smoke" color and judge the fault: what's the matter with the blue smoke, black smoke and white smoke from the tractor engine?

At normal operating temperature, the exhaust smoke color of diesel engine should be colorless or light gray. The so-called colorless is not completely colorless, not as colorless as gasoline engine, but with light gray in colorless, which is the normal exhaust smoke color. The exhaust smoke color of diesel engine may be heavier at idle speed and at high speed and high load. Pay attention to observe the normal exhaust smoke color in order to have a clear understanding of the abnormal exhaust smoke color.
1. The main reasons for the white smoke emitted by diesel engine are as follows
(1) The engine temperature is too low, the diesel is not easy to compress and ignite, and the milky white smoke is discharged from the exhaust pipe.
(2) Injection time is too late.
(3) There is water in diesel.
(4) The injection interval angle of each cylinder is inconsistent.

(5) Poor atomization or low injection pressure caused by dropping oil from the injector during injection

2 the main reasons for diesel engine exhaust black smoke are as follows
(1) The air filter is blocked.
(2) The injection time is too early.
(3) Individual cylinders of the engine do not work or work poorly.
(4) The fuel supply of the fuel injection pump is too large or the fuel injection of each cylinder is uneven.
(5) Poor atomization of fuel injector.
(6) Excessive engine load

3. The main reasons for the exhaust of blue smoke from diesel engine are as follows
(1) Use inferior diesel oil, or the diesel oil circuit such as oil pipe and filter element is blocked.
(2) The engine oil is overfilled.
(3) The cylinder liner, piston and piston ring exceed the wear limit.
(4) Aging of valve oil seal.