1. Cylinder liners cannot be pressed with cylinder heads. Some agricultural machinery operators do not install cylinder heads when installing cylinders. They directly install cylinder heads and press cylinder heads by tightening cylinder head bolts. In this way, when the cylinder sleeve is pressed into position, the pressure of the cylinder head all acts on the cylinder sleeve shoulder of only about 3 mm, which will cause the cylinder sleeve to break. The correct installation method is: Place the wood board on the upper end of the cylinder liner and tap the board with a hammer until the cylinder is in place.
2. Do not flush the fuel tank with compressed air. Before welding the gasoline tank, the gasoline in the tank must be washed. Some repair personnel use compressed air to flush the fuel tank. Because of the small size of the tank port, gasoline molecules may generate sparks in the case due to strong collisions, which may cause explosions and personal injury or death. Use cleaners to clean the fuel tank.
3, can not use the spring pad instead of locking piece. After the connecting bolts between the driven drum hub and the driven drum of the steering clutch of the Dongfang Hongyi 75 tractor are fastened, they are locked with locking plates. For ease of removal, some robots use spring washers instead of locking tabs, and some add a flat washer. Because the washer is thicker than the locking piece, the top of the connecting bolt rubs against the left and right side walls of the rear axle housing after assembly, plus the joystick is continuously pulled by the tractor during operation, and the rear axle shaft generates axial turbulence, and the corresponding position on both sides of the shell is ground out. A deep annular groove causes the strength of the casing to be greatly reduced. Once the tractor is overloaded, the rear axle housing can easily break from the ring groove.
4, can not be free to configure oil drain plugs. The oil drain plug on the oil shell is made of magnetic material, which can effectively absorb the iron scraps in the oil and reduce machine wear. Can not be made of ordinary steel or other screw plugs instead.
5. Do not warm the piston with an open flame. Some maintenance personnel in the replacement of the piston, in order to successfully assemble the piston pin, go down to the point of the diesel piston, plug some rags, and then ignite the direct heating of the piston. The harm to do this: First, the piston heat uneven, easy to deform; Second, after the rag burning ash is not easy to remove, will accelerate the cylinder sleeve piston ring wear; Third, it takes a long time to clear the cloth dust, the piston temperature will drop, install the piston When the pin is still hammered by hand, it will cause further deformation of the piston. The right way: Put the piston into 120°C oil or 100°C water, then take out and install the piston pin immediately.
6. Dilute sulfuric acid cannot be added when the storage battery is depleted due to insufficient storage capacity. When the battery is in use, the sulfuric acid in the electrolyte is not consumed, but it gradually shifts to the two plates as the discharge progresses, and the density of the electrolyte drops. As long as the battery is charged with a DC power supply, sulfuric acid will be precipitated from the plate and the electrolyte density will be restored. When the battery is undercharged, adding dilute sulfuric acid will not only increase the power but also damage the battery. The correct approach is to charge the lossy battery after it is unloaded.
7, can not be bent when dismantling and assembling hydraulic pipeline. The pressure loss caused by the bent hydraulic pipe will far exceed the normal value. The greater the pressure loss on the pipeline, the lower the effective pressure delivered to the parts that do the work. Moreover, after the pipe is bent, the flow rate and direction of the hydraulic oil at the bend suddenly change, and the resulting hydraulic shock has a great influence on the service life of the hydraulic pipe, and even causes the pipe to suddenly explode.
8, the length of diesel high-pressure tubing can not be arbitrarily changed. Because the diesel injection process time is very short, the high-pressure fuel pipe delivers diesel fuel to the injector at a certain pressure and speed through the pressure wave. Because the high-pressure fuel pipe has a certain degree of elastic deformation, its length and bore diameter directly affect the injection process of diesel fuel. . If the length of the high-pressure fuel pipe increases, its volume also increases, which not only increases the time for transmission of the pressure wave, but also causes changes in the fuel injection law, which leads to delays in the injection time and increases in the duration of the injection, which affects the normal operation of diesel combustion, resulting in diesel engines. The power drops and the heat loss increases.
9. Do not apply butter in the ring groove. In order to avoid misalignment of the piston ring during installation, some operators put grease on the ring groove of the piston ring to stick the ring, which is very harmful. When the engine is working, the butter forms a jelly when it is hot, which affects the elasticity of the piston ring, reduces the sealing performance, and produces carbon deposits, which aggravates the wear of the parts.
10. It is not allowed to install only one spring in the dual-valve spring diesel engine. On high-speed overhead diesel engines, there are two valve springs, one large and one small, which rotate in opposite directions. When one spring breaks, the other spring can still support the valve, preventing the valve from falling into the cylinder and causing an accident. The two springs rotate in the opposite direction. After one breaks, the other spring does not get stuck. This ensures that the other spring works normally. Some operators believe that since one spring is broken, there is still one spring to work, so when a spring is broken, it is not replaced in time, or even only one spring is installed. This is wrong, and it will destroy the spring. The original design required that not only the spring elasticity be weakened but also the valve locking tabs could come off, which would have serious consequences. Therefore, in a diesel engine using a double-valve spring, when a spring breaks, a new spring with the same specification must be replaced in time, and not only one spring can be installed.
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