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Engine Replacement Repair Six Attention
1, the assembly must pay attention to clean. If the machine body is mixed with mechanical impurities, dust, and oil sludge during assembly, it will not only accelerate the wear of the parts, but also easily cause blockage of the oil circuit, resulting in accidents such as the burning of the bearing bush and the shaft. If a new injector is replaced, the rust preventive oil must be removed from clean diesel oil at 80°C and then assembled for sliding test. 2, pay attention to assembly technical requirements. Repair personnel generally pay more attention to valve clearance, bearing clearance, etc. However, some technical requirements are often overlooked. If the cylinder liner is installed, the upper plane should be about 0.1 mm higher than the plane of the machine body, otherwise cylinder leakage may occur or Continuous failure of the cylinder head gasket. 3. Note that some fittings must be replaced in pairs. The three precision coupling parts of the injector needle valve coupler, plunger coupler and outlet valve coupler are to be replaced in pairs. This can generally be done. However, some other accessories do not pay attention to pair replacement, such as the replacement of gears, only the replacement of a more serious wear and tear, after assembly due to poor meshing, noise, increased wear and tear, the service life will be greatly shortened. If you change the cylinder liner, you should also replace the piston and piston rings. 4. Parts of variant products are not necessarily universal. Some diesel engine plants produce a number of parts of a certain type of variant product is not universal. For example, the crankshaft of the S195B diesel engine, main bearings, cylinder liners, pistons, intake and exhaust valves, valve guides, valve springs, and other components are not common. 5, different parts of the same model (parts) are not universal. When using the repair size method, an oversized part may be selected, but it is necessary to look for which level of the part is increased. If the crankshaft is used for the first time, only the bearing with 0.25mm increase can be selected. If the bush with 0.5mm increase is selected, the scraping amount of the bearing bush will increase, which will not only waste time, but also can not guarantee the repair quality, and will also greatly reduce the use of bearing bushes. life. 6, to prevent parts misinstalled, missing equipment. In the case of a single-cylinder diesel engine, there are more than one thousand parts, and most of them have certain installation position and direction requirements. If they are not noticed, they can be easily misplaced or missed. If the position of the swirl chamber insert is reversed, fuel cannot directly pass through the start nozzle, making the engine start difficult or not start at all.