During the high temperature maintenance of the long arm excavator, have you ever encountered the black smoke produced by the diesel engine? What I didn't see means you still have a long way to go from that old driver!
This paper analyzes the factors of black smoke in the maintenance process of long arm excavator.
(1) Insufficient compression force: valve, piston ring and cylinder liner wear, resulting in insufficient compression pressure, compression pressure and temperature below the standard, fuel combustion conditions deteriorated, easy to produce smoke and dust;
(2) Change of combustion chamber shape and volume: due to manufacturing quality and long-term use, the technical conditions of combustion chamber are reduced, and the change of compression gap will also change the shape and volume of combustion chamber, thus affecting the mixing quality of fuel and air, and worsening the combustion conditions. If the piston is installed in the opposite direction, the matching work of injector, combustion chamber and intake port will be affected, and good mixture will not be formed, and incomplete combustion will occur.