| Oil pump and adjust the amount of the reasons for the uneven |
First, the reasons for uneven fuel pump supply 1. Debug status and conditions of use of different Injection pump test stand is in the debugging at room temperature, while the installed capacity use is the end of compression in the cylinder, the cylinder temperature of 500 ~ 700 ℃, pressure of 3 ~ 5MPa conditions of use, the difference is larger. Locomotive operation, the fuel pump and injector temperature reached 90 ℃, can also cause the viscosity of diesel dropped, so the plunger and the needle pieces of endoleak even more, back when debugging more than oil. According to the determination of the actual fuel injection pump fuel injected into the cylinder test bench debug only about 80% of the amount, although the pump commissioning staff will consider this factor, but not exactly grasp. In addition, the cylinder piston and valve train wear or confined the different levels of compression of each cylinder temperature and pressure will make a difference. Even if the fuel pump test stand debugged, installed after use, the cylinder fuel supply will produce uneven. 2. Debugging existing supply uneven Fuel injection pump test bench debug in, request the rated speed of each cylinder in the amount of oil under the unevenness should be "3%. The actual debugging process, because a dedicated test-bed high-pressure fuel injectors and tubing length, shape, diameter and so can not be fully consistent with the original machine, coupled with differences in debugging technology, fuel pump installed, the actual oil sprayed into the cylinder amount of unevenness is often> 3%. 3. Mechanical failure caused by uneven supply The long-term use locomotives, fuel pump drive coupling Songkuang or the gap is too large, drive gear wear, backlash increases, will also affect the uniformity of the cylinder oil. In addition, the high-pressure pipe joints due to vibration or tight enough frequent leakage, and tighten the joint force of the Ambassador and blocked off the metal tubing, it will also cause the uneven amount of cylinder oil. In addition, fuel pump and governor spring, where a strong force, large deformation, the work was undoubtedly the high frequency of the plunger spring. So the break frequency is higher. Light were reduced fuel injection, fuel injection quantity of each cylinder uneven, the cylinder fuel injection interval tolerance, injection start time delay; severe oil supply interruption can not even oil. Second, after the re-adjustment of fuel pump installed 1. Injection pump re-adjusted basis According to the cylinder exhaust temperature, pressure, or smoke color to determine the actual work and the extent of the combustion engine to determine the amount of oil in the tank too much or too little, too early or too late supply, and then re-adjust . By adjusting the oil supply and oil supply of each cylinder of time, so that each cylinder of diesel engine fuel injection pump in accordance with the principle of distribution according to oil, to eliminate the differences between the actual existence of each cylinder. 2. Injection pump re-adjustment technique (L) fuel pump installed, press the required standard tuned supply time and remove the exhaust manifold in order to observe the work of each cylinder. (2) start the engine, idle idle 2 ~ 3min, touching the cylinder exhaust port and cylinder head near the injector, if a cylinder temperature is too high, can initially determine the amount of the high side of the cylinder oil. (3) When the machine when the temperature exceeds 50 ℃, increase the throttle to keep the engine running at rated speed, while viewing the exhaust smoke color, attention to listen to the voice of the cylinder. If a cylinder of black smoke, indicating excessive supply, to construction machinery equipped with larger 135 series diesel engine, for example, adjust the gear lever can pump the oil to stop the direction of pull, release the locking screw on the adjusting gear , take a thin iron rod into the holes in the oil control sleeve, tapping with a hammer to make the right turn, could reduce the fuel supply, and vice versa increased. When a cylinder with crisp percussion, and the difficulty in starting, that oil began early; if a cylinder temperature high, and even a flame spray, it may be too late to supply the start time. Such as the 135 series diesel engine, the cylinder oil to adjust start time, the location is determined by the plunger pump. When the oil started too late, should adjust the nut and the screw rotation time some, oil started too early, then some of this tightening screw. (4) Check the fuel supply advance angle The general method can be used to check the oil supply advance angle, high-pressure pipeline will pump a joint release, will be connected to one end of the connector remove the injector, the tubing turned horizontal position, then tighten the high pressure pump tubing connector, pull the throttle to the maximum position, open the vacuum pan car, until the exit of high-pressure pipeline until the smoke a few drops of diesel. Wipe the outlet pipe of diesel, and then slowly turn the flywheel. At the same time to observe the pressure at the outlet of the oil pipeline surface, moving at the moment it begins to immediately stop the flywheel turning. At this point, water tanks or lines engraved on the body should be aligned with the flywheel only point between the former 16 ~ 20 °. If there are two previous oil spill in the aligned, indicating that fuel supply advance angle is too large, fuel prematurely; only if more than the oil spill, that fuel supply advance angle is too small, fuel too late. It should be noted is that for multi-cylinder diesel engine, need to install special glass and pointer, measure only the first cylinder on the compression point and the beginning of oil on the pulley when the fan arc between the two marks to determine the fuel supply advance angle is correct. At the same time also check the pump oil every single batch are the same, if different, adjustable gap between the plunger and the tappet or gasket between the pump and the thickness of the body, so that oil to reach the same batch. When the fuel supply advance angle is too small or too large to be adjusted, different models of fuel supply advance angle adjustment in different ways. 195 and 190 new diesel engine, fuel pump and the body through the change between the copper pads to adjust the fuel supply advance angle. Gasket oil change increased time later, and vice versa earlier. 190-1 and the 1105 diesel engine, fuel injection pump to adjust the column with the dynamic adjustment screw to adjust the fuel supply advance angle to the inside (outside) the supply time to tighten the screws become night (morning). 4115 diesel engine is then set by adjusting the spline gear and fuel pump to change the relative position of injection timing, and then set with the fuel pump spline spline shaft clockwise a hole, the fuel supply advance angle increased 3 ° , to oil early, on the contrary, counter-clockwise rotation of a hole, the fuel supply advance angle decreased 3 °, the oil time to change later. The notes of the above, check the cylinder exhaust temperature is consistent, if it can not restore the normal operation of the engine, you should measure the cylinder pressure is within the allowable range, if necessary, replace the piston rings or valve grinding, check the fuel injector atomization conditions and opening pressure is |
