Common Problems in Fuel Injection Pump 294000-0618 Commissioning

The technical condition of the injection pump is not only related to the condition of the parts, but also related to the adjustment factors, this article will introduce you to the fuel injection pump 294000-0618 common problems in the commissioning.

1. Fuel injection pump 294000-0618 common problems in commissioning

Fuel injection pump 294000-0618 adjusted on the test bench qualified, installed in the engine to use, often under power, unstable speed and black smoke and other phenomena.

(1) Idle fuel supply fails to meet the requirements. This situation occurs after the rated oil supply and unevenness of each cylinder is adjusted and qualified. Sometimes during the idle oil supply test, the unevenness of oil supply often exceeds the permissible value. This is caused by the wear degree and sealing performance of the plunger coupling is inconsistent, the oil outlet valve coupling sealing performance has differences, or the passing performance of the injector is inconsistent. In this case, the oil outlet valve coupling or injector can be adjusted, and then re-adjusted.

(2) The actual oil supply is insufficient. This situation, according to our experience, the main reason in the test bench for the test of the oil transfer pump, filter, high-pressure oil pipe. Injectors and other technical status and actual use is not exactly the same, the most important is the injector and fuel pipe through the ability and leakage and the difference in the location of the fuel tank. In addition, in the test on the pump head of the low-pressure oil chamber of the oil pressure is not enough attention, often in the test bench wrongly block the oil return port, and with its own oil transfer pump to the pump head oil supply, so that the low-pressure oil pressure is much higher than the corresponding pressure on the engine, resulting in the actual supply of oil is insufficient. Caused by the actual oil supply is not enough of another reason: the oil pump adjustment, oil temperature, diesel fuel grade and the engine actually work with the difference. For the wear of the plunger, according to the adjustment of the room temperature and the standard room temperature (20 ℃) between the error and the plunger wear, the appropriate increase in the amount of oil supply. Generally speaking the plunger sub with less wear, such as when the camshaft speed is 250 r/min and the plunger sub pressure reaches 34. 3 MPa, the oil supply quantity can be increased by about 11% to 13% on the basis of the standard oil quantity.

(3) The actual stopping speed is high. Fuel injection pump 294000-0618 on the test bench to stop supplying speed inaccuracy is due to: the test bench drive belt slippage, drive shaft from load to no load when the speed drop is too large, it is difficult to accurately read out the stopping speed, so should strengthen the maintenance of the fuel pump test bench and strict control of the test conditions. Carefully adjust the test bench transmission system, its drive shaft from load to no load, the speed drop should generally be controlled within the range of 5 ~ 10r/min is appropriate. If the break-in is not yet the end of the engine, its maximum idling speed is low, which is a normal phenomenon. Once the break-in is good, the speed will be normal. According to experience, generally do not have to rush to adjust the injection pump high-speed limit screw to improve the speed. There is a need to adjust, but also to the pump test bench for good.

(4) The actual oil supply is large. After starting the engine, found that the engine smoke, to confirm that other parts of no problem, the actual measurement of its oil supply than the prescribed value is large, from the injection pump, is the amount of oil supply in the adjustment of the error, should be more in the test bench to find the reason, such as the test bench on the high-pressure fuel pipe and the engine is different, especially on the test bench on the high-pressure fuel pipe, after many years of use, repeated dismantling, the diameter of the pipe mouth due to extrusion and deformation of the narrowing of the oil resistance to increase. Increase, we have had such a lesson, so the high-pressure oil pipe used on the test bench, should be regularly checked and corrected.