Lycyl's HOWO A7 No oil is released from the fine filter oil drain screw. Consult the service station. They say that the pressure inside the high pressure oil line cannot be reached. This situation can only be started several times before the injector can be sprayed when the high pressure oil line reaches the working pressure. Oil, the engine can catch fire. Then start and restart, but the engine is not on fire. Once again, the oil circuit is checked again, or the low-pressure oil path is checked first. There is no air in the primary strainer and fine strainer, and there are two reverse flow valves from the fine strainer to the high-pressure oil pump. Its role is to establish a certain level in the low-pressure oil circuit. The pressure, remove the first counter-flow valve found that the seal is not strict, with the mouth blowing a leak, after the restoration of the sealing function, remove the second is close to the high-pressure pump that check valve, open and found in the ball and tube There is a small piece of hard material at the seal of the road. After careful inspection, it is actually the adhesive glue dropping off at the junction of the paper core and the end cap in the filter. From the inspection process of the two reverse flow valves, it is seen that Filters are really harmful. Paper core and end cap come off, adhesive enters the tubing Advise everyone that, in particular, friends with electronically controlled engines in their hands, must buy genuine Euro III filters, do not buy cheap stuff, in fact, my filter did not spend less, are In the service station to buy, 唉 --- these black heart services. At this time, the fault code 639 on the instrument panel was still there. I thought I could start to find the problem, but it was not enough. From 9.30 am to 2:00 pm, the service station was still at a loss, and I used to work at the service station. A master of time judges the oil problem. Start to check the high pressure oil line, open the high pressure tubing screw, found through the pump oil, the high pressure tubing injector end oil without air, but not much pressure, each cylinder is the case, all the pipe joints screw tightened to restart the engine, still As always. The circuit is judged by the technicians to be no problem. At this time, the two batteries have been unable to work. After that, the two batteries will continue to operate. According to the program given by the service station, the pressure on the high-pressure oil line will continue to increase. After a few torments, it will not help. Luo Hao spent such a long time, in fact, just want everyone to understand the process, you do not blame. Now it is necessary to solve it. How can we solve it? Not afraid of everyone's jokes, it's really Mongolian, take pictures first Coupling screws in front of the common rail We took a closer look. At the front of the high-pressure common rail, there is a tubing connection screw. Gently loosen it and press the pump again. The loose screw removes a small amount of air and tightens it. The fault code 639 on the disk disappeared, and the key was turned on successfully. To sum up, from the very beginning, the pressure of the low-pressure oil line is not great. Check the reverse valve and find the foreign material. Its malfunction is mainly caused by the inferior filter. Then, during the exhaust process, a small part of air enters the common-rail system. Seeing that a very small amount of air entering the common rail system means that it does not allow working pressure in the high pressure oil line to cause the engine to fail to start. Fault code 639 seems to represent air in the common rail. Forgot to tell everyone that my car is the HOWO A7 380. I do not know if this fault code 639 is common with other brands. Not afraid of everyone joking, this troubleshooting is blindfolded. But I feel like I can be considered a little bit of experience. Speak up to let everyone know that if there is a little help for everyone, it is my original intention. Again, don't try to use cheaper filters. Poor quality filter Especially the national engine. From the above it can be seen that I am a victim of poor quality products, because I have a fuel injector on the engine, it is not cheap.
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Inferior products cause the engine not to catch fire diagnostic experience
After changing the oil and three filters, pump oil, exhaust, start the engine more than ten times, do not catch fire, listen to the sound is no oil feeling, this time found fault code 639 on the instrument panel, view the vehicle manual and engine manual On the fault code table, there is no such one, or check the oil road.