01. What is diesel engine overhaul
"Overhaul" refers to the replacement of the four supporting parts of the engine cylinder, bearing shells, seals, grinding or replacement of deformed parts. "Four sets" refer to cylinder liner, piston, piston ring, piston pin, piston pin snap ring, cylinder liner water stop ring and other parts.
02. Why overhaul the engine
It can be seen that the major overhaul is to replace the easily worn parts in the cylinder. So what are the most easily worn parts? First of all, several mating parts in the cylinder [piston - piston ring], [piston ring - cylinder liner] and [piston - piston pin].
Do you know when the construction machinery and equipment need to be overhauled?
Among these fits, the most easily worn one is the [piston ring cylinder liner] fit. There are three piston rings, two gas rings and one oil ring, which play the roles of gas sealing, heat conduction, lubrication and oil scraping. Once worn, it will leak air (causing the whole vehicle to be weak and difficult to start), and the engine oil will leak into the combustion chamber (emitting blue smoke and burning engine oil).
Do you know when the construction machinery and equipment need to be overhauled?
[piston - piston ring] matching is easy to deposit carbon. The piston chamber needs to run back and forth quickly. The impurities of mechanical wear and the carbides left by the impurities of air inlet accumulate in the piston ring gap. Over time, the piston ring will shift and slide, and then the cylinder liner will be damaged. The worst result is cylinder biting, cylinder pulling, cylinder disengagement, etc.
[piston and piston pin] generally, there is no problem. However, some cases of missing snap rings have been received, resulting in direct damage to the cylinder block.
03. Under what circumstances should the engine be overhauled
1. The whole vehicle is weak
2. Blue smoke
3. Oil burning
Of course, the above is not absolute. The final judgment should be made in combination with the use of the machine.
Do you know when the construction machinery and equipment need to be overhauled?
Generally speaking, when the machine is working in earthwork and under normal maintenance, 8000-10000 hours of overhaul is normal. If the mine, the crushing hammer, the use of low-quality filter elements, and the maintenance are not timely, it may need to be overhauled after 4000 hours. In addition, if the new car is worn early due to excessive work during the running in period, it will need to be overhauled in hundreds of hours.
Of course, if your construction machinery vehicle breaks down, it's best to find the after-sales service personnel first, or consult the technicians, so as to better judge whether the vehicle has a major fault!
