Repair of 6135 diesel engine B type injection pump camshaft

6135 diesel engine uses a B-type integral plunger pump. It is fixed on the bracket on one side of the diesel engine body by four bolts and is driven by a diesel engine crankshaft by a timing gear. The fuel injection pump camshaft and the fuel injection pump drive shaft are connected by a coupling. The lift of the injection pump cam is 10mm, the center distance of the minute pump is 40mm, the maximum speed of the injection pump reaches 1000r / min. Due to the high speed of the injection pump and the installation form of "4-point support" and improper use and maintenance, it is easy to cause abrasion of the arc surface of the pump body at the joint of the injection pump and the bracket (the wear of the arc surface in the bracket is relatively small) Pump down, so that the camshaft axis and injection pump drive shaft offset. Fuel injection pump camshaft torsion, bending and swinging and other forces generated additional alternating stress, eventually leading to camshaft fatigue fracture. Troubleshooting method, the general is to repair parts. 6135 Diesel Diesel B-type injection pump camshaft journal surface roughness of not more than Ra0.32, hardness not less than HRC45, cylindricity tolerance of 0.10mm, full-length straightness tolerance of 0.05mm. If you can not find the cause of the camshaft fracture, will inevitably lead to rupture again. There are 3 kinds of emergency methods for site repair. (1) The root cause of the camshaft fracture caused by the original repair method is the wear of the pump body. Therefore, the pump body welding, brazing to take "heap fill" method of welding, heap thickness and area slightly larger than the wear and tear. Welding after the use of methods of cutting and grinding the welding parts polished flat, restore the original geometry of the pump, cleaning the various parts, installed after commissioning can be used. The original repair method can also use metal glue make up the method of repairing the pump body, that is, a good modulation of the metal coating on the wear area, the thickness and area of ​​the metal coating slightly larger than the amount of wear, until the metal gel solidified 20 ~ 30min, the area coated with metal glue grinding and polishing, cleaning the parts, after installation debugging can be used. (2) Splitting parts 6135 Diesel B-type fuel pump pump material is generally cast iron or aluminum alloy, despite the different materials, the installation of the same size and internal structure. Therefore, we can scrap the 6135 Diesel B-type injection pump, according to the need to disassemble available pump body, camshaft and other parts, assembled into a complete B-type fuel pump, installed after debugging qualified use. (3) Additional Parts Act The "Additional Parts Act" may be used when the "Original Repair Act" and "Splitting Parts" can not be used under field conditions. The specific method is: ① with the file and emery cloth to wear and tear parts of the pump grinding (wear parts with the bracket with the surface, and by one side of the fuel pump drive shaft wear more serious); ② with a deep caliper to measure the wear and tear after grinding the pump The depth of the site, the wear depth is generally between 05 ~ 1mm; ③ with copper or iron made of additional pads, the thickness of the measured depth of the worn site to determine the size of the width approximately equal to the thickness of the stent, the length of approximately equal to the pump Body wear parts of the arc length; ④ system will be made of the gasket attached to the bracket and the wear parts of the pump body, the number should be measured according to the depth of the wear site to determine the value, generally not more than 3; ⑤ start after installation and adjustment Test the car. 6135 Diesel B-type fuel pump pump wear is mainly due to the relatively loose pump and bracket caused. Therefore, the following three aspects can be prevented. (1) Installation To be properly installed, pay attention to the following points: ① fixed bolt diagonal tight. If you set the two bolts on the outer side or the side of the body, you may change the adjusted advance angle of oil supply on the one hand, and may cause the axis of fuel injection pump camshaft to be offset from the axis of pump drive shaft. Additional alternating stress fatigue fracture. ② fixed bolts should be sub-2 to 3 times tight. ③ tightening torque bolts should be between 1.5 ~ 2.5N? M. ④ fixing bolts should be firmly in place. For example, the two fixing bolts near one side of the machine body are not tightly fastened due to the restriction of the installation position, and the two fixing screws on the outside are easy to tighten excessively. (2) Maintenance It is necessary to pay attention to the following three points in the process of using and maintaining: ① The quantity and quality of the oil in the injection pump should meet the requirements. Such as poor lubrication, ranging from the premature transmission parts of the pump wear, heavy bearing stuck, causing the cam to twist off. ② camshaft axial clearance to be appropriate, usually 0.03 ~ 0.15mm. Gap is too large, the camshaft wear and tear accelerated, diesel engine is not running smoothly, resulting in premature wear and tear of the pump. ③ fuel injection pump advance angle and fuel supply interval angle of each cylinder to meet the requirements, otherwise not only make the diesel engine power, economic deterioration, but also cause the engine starting difficulties, unstable operation, leading to pump wear and tear faster. (3) Check the timely 6135 diesel engine type B pump body and bracket loose, usually during the week to carry out maintenance inspection. If you find abnormal diesel engine or pump loose phenomenon, should be promptly checked tight.

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