A diesel engine is an engine that burns diesel fuel for energy release. The diesel engine adopts the method of compressed air to increase the air temperature so that the temperature of the air exceeds the spontaneous ignition temperature of the diesel fuel. At this time, the diesel fuel, the diesel fuel spray, and the air are mixed and burned. Therefore, diesel engines do not need an ignition system. At the same time, the diesel engine's fuel supply system is relatively simple, so the reliability of the diesel engine is better than that of the gasoline engine. Due to the non-detonation limit and the need for diesel self-ignition, the diesel engine has a high compression ratio. The thermal efficiency and economy are better than those of the gasoline engine. At the same time, the diesel engine has large torque and low rotational speed at the maximum power, which is suitable for the use of trucks.
Type 6135 diesel engine adopts type B integral piston type fuel injection pump. It is fixed to the bracket on one side of the diesel engine body with four bolts. The crankshaft of the diesel engine is driven by the timing gear. The camshaft of the injection pump is connected with the drive shaft of the fuel injection pump through a coupling. The lift of the injection pump cam is 10mm, the center distance of the sub-pump is 40mm, and the maximum speed of the fuel injection pump is 1000r/min. Due to the high rotational speed of the fuel injection pump and the “4-point support†installation and improper use and maintenance, it is easy to cause arc wear on the outside of the pump at the joint between the fuel injection pump and the bracket (the wear of the arc surface inside the bracket is relatively low). The pump body moves down, offsetting the axis of the camshaft and the axis of the injection pump drive shaft. The camshaft of the fuel injection pump is subjected to torsional, bending, and oscillating forces to generate additional alternating stresses, which ultimately leads to fatigue fracture of the camshaft.
The method of troubleshooting is generally a replacement repair. The surface roughness of camshaft journal of Model B 6 type diesel fuel injection pump is not greater than Ra 0.32, the hardness is not lower than HRC 45, the cylindricity tolerance is 0.10mm, and the full-length straightness tolerance is 0.05mm. If you can not find the cause of the broken camshaft, it will inevitably lead to break again. There are three emergency methods for on-site repair.
Part split spelling
Type 6135 diesel engine type B fuel injection pump body material is generally cast iron or aluminum alloy, although the material is different, its installation dimensions and internal structure are exactly the same. Therefore, in the B-type fuel injection pump of the 6135 type diesel engine that has been scrapped, the pump body, camshaft, and other parts that can be used are dismantled as required, and assembled into a complete B-type fuel injection pump. After commissioning, it is installed and used.
Additional parts method
In the field conditions, when the “original repair method†and “parts disassembly spelling method†cannot be used, the “add-on parts method†can be used. The specific methods are as follows: 1 Polish and polish the worn parts of the pump body with a guillotine and an emery cloth (the wear part is the mating surface with the bracket, and the end of the drive shaft of the fuel injection pump is worn more seriously); 2 The wear of the pump body after grinding is measured with a depth caliper. The depth of the part, the depth of wear is generally between 05 ~ 1mm; 3 made of copper or iron sheet made of additional pads, thickness determined according to the size of the measured wear part depth, width is equal to the thickness of the bracket, the length is equal to the pump The arc length of the wear part of the body; 4 The spacers shall be attached between the wear parts of the bracket and the pump body. The quantity shall be determined according to the measured depth value of the worn parts. Generally, it shall not exceed 3 pieces; 5 Test drive.
Original repair method
The root cause of camshaft fracture is the wear of the pump body. Therefore, the pump body can be welded by welding and brazing. The thickness and the area of ​​the heap are slightly larger than the amount of wear. After welding, the welding and polishing are used to polish and flatten the welding area, restore the original geometric shape of the pump body, clean the parts, and use it after installation and debugging. The original repair method can also use the method of metal glue to repair the pump body of the fuel pump, that is, apply the prepared metal glue on the wear area, and the thickness and the area of ​​the metal glue coating are slightly larger than the wear amount, and the metal glue is to be solidified. After 20 to 30 minutes, the area coated with metal glue is polished and cleaned, and the parts are cleaned. After installation and debugging, it can be used.
titanium iron
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