Rebirth of the Auto Giant

Chapter 170 Learned another trick

In fact, Zhang Taiqin knew the result in the morning, but he didn't say it clearly. He asked the two apprentices to follow their own ideas and go through the whole process. This would have a more profound effect than solving the problem first and then preaching.

"Start by following the oil line, looking at the fuel tank, the fuel pipe, and then the two thick and thin diesel filter cores," Zhang Taiqin said.

The two apprentices removed the fuel pipe from the fuel tank to see if there was any problem. When they removed the diesel filter element, they were stopped by Zhang Taiqin, "The customer of the diesel filter element said that it had just been replaced less than a month ago, and the diesel used was all diesel from regular sources."

, the probability of blockage after only one month is not high, there is no need to disassemble the two filter cores." Zhang Taiqin said, looking at Lu Junying

After the two of them put the oil pipes back, Zhang Taiqin explained: "These two diesel filter cores are single-use filter cores, which have good filtering effects. However, there is a disadvantage. It is easy to deform once you remove it, which will affect the internal components."

Damage to the structure can easily lead to uneven sealing of the contact parts and poor sealing of the rubber ring, leading to oil leakage." Zhang Taiqin said.

When Lu Junying heard this, he stared at the high-pressure pump and said, "Master, the only thing left is the high-pressure oil pump."

"That's right." Zhang Taiqin responded.

"Great." When the two heard the master's words, they knew they were getting closer to the truth. After working for a long time, they found out that it was a problem with the high-pressure oil pump.

"Remove the oil pipe of the low-pressure oil pump and take a closer look," Zhang Taiqin warned.

"Okay." They were getting closer and closer to the truth. The two of them were a little excited. Lu Junying picked up the No. 17 opening wrench and held the pipe while lifting it up and twisting it counterclockwise. The oil pump joint was removed. Lu Junying

I took it off and looked at it carefully. There was a small thing inside. I poured it out and took a look. It didn't matter if I didn't look at it. When I saw it, I shouted excitedly: "Master, look!"

Lu Junying's offering of treasure seemed to shake out a joint filter net from the joint and handed it to Zhang Taiqin's eyes.

This is a metal filter screen installed inside the oil pump joint. Its function is to filter out impurities entering the oil pump and reduce wear of the oil pump and high-pressure oil pump.

"Well, now it seems that the problem is caused by the blockage of the filter network." This is also a common fault, especially now that the quality of diesel is poor. This fault accounts for a particularly high proportion of service cases.

In fact, Zhang Taiqin thought of this problem at the beginning, but he didn't point it out clearly. He asked the disciples to investigate it bit by bit according to their own ideas. Only in this way can they be impressed, and the effect would be better than solving it directly.

The fault point has been found and the two of them are very happy.

This time, the master didn't do anything. They investigated it all by themselves. The whole process was found out by the two of them based on their own ideas.

"Clean it and then install it." Zhang Taiqin said happily, watching the two apprentices clean it with diesel oil and install it, and then use the manual oil pump to drain the air inside.

The two of them knew these basic common senses after following Zhang Taiqin for so long.

"Okay, I'm going to start the car." Lu Junying looked particularly excited. After installing it, he turned around and got into the cab to start the car.

"Dudu——" Sure enough, it clicked as soon as it hit.

"Success, master!" Lu Junying shouted excitedly.

Zhang Taiqin frowned, "Get out of the way, I'll try." After Zhang Taiqin said that, Lu Junying got out of the way, sat in the cab, drove the car out, and turned around to come back.

"Don't you think this car is shaking a lot?" Zhang Taiqin got down and started idling the car and said to his two apprentices.

"Master, when you say that, I really feel that the engine is vibrating badly." Jiang Xingxin said.

Then Zhang Taiqin came with two apprentices to check the exhaust gas, and found that the color of the exhaust gas was normal and there was no black smoke.

"It's not just the shaking that's severe. I tried it just now and the horsepower dropped and the speed was unstable. This shows that there are other faults." Zhang Taiqin said, asking Lu Junying to turn off the engine and stop the car.

"Check each cylinder to see if there is any problem with the high-pressure oil pump of each cylinder. If it is normal, then check the fuel injector of each cylinder." Zhang Taiqin looked at the time and it was not too late. No matter what, he was going to car today.

Fixed.

The two people followed the master's instructions, disassembled the high-pressure oil pipes of each cylinder, and started the car while checking.

"Master, there is no oil coming out of the second cylinder. It seems that there is a problem in the high-pressure oil pump of the second cylinder." Jiang Xuxin loosened the high-pressure oil pipe of the second cylinder and asked Lu Junying to start it continuously. When he saw that there was no oil coming out of the second cylinder, "Stop!"

"Then he shouted loudly to Lu Junying in the cab.

"Have you found the fault point?" Lu Junying walked to the engine and asked.

"Credit, go and activate it and let Lu Junying take a look." Zhang Taiqin said.

The two of them exchanged words and both saw the fault. Then it was time for the master to take action.

Zhang Taiqin opened the second cylinder and took out the plunger assembly. He checked again and found that the plunger spring was broken, causing no oil supply. "Did you see that?" Zhang Taiqin took out the plunger spring that was broken into two sections and placed the plunger assembly neatly.

Said together.

The two squatted down and observed carefully.

"Master, this seems to be the first time we have encountered this kind of problem." Jiang Xingxin said looking at the plunger spring in front of him.

"Yes, this is the first time I have encountered it. Please remember this phenomenon. Maybe you will encounter it again in the future."

"The failure of the high-pressure oil pump is the most common failure of the diesel engine. In addition to the broken stuck spring of the plunger coupler, there are also low injection pressure, broken pressure regulating spring, clogged nozzle hole of the needle valve coupler, and injector needle valve

You will still encounter failures such as stuck parts and so on in the future," Zhang Taiqin said.

When the two heard what the master said, they had never even seen it, let alone repaired it. Jiang Chengxin asked worriedly: "Master, we have never dismantled this high-pressure pump, and we don't know about the problems you mentioned.

, what if we meet each other outside?"

"Yes, Master, I can't let customers say I don't understand, that would be too embarrassing." Lu Junying added.

"If you know it's embarrassing, just study hard from now on. No one is born with it." Zhang Taiqin glared at the two apprentices, and then said: "When I go back, there will be faulty parts brought back by the service, and I will teach you how to disassemble and reassemble them."

There are some common faults. If it doesn’t work, replace the entire high-pressure oil pump assembly." Zhang Taiqin said with a smile.

"Hey, this is a good idea. Just replace the assembly. I like it." Lu Junying said with a smile.

"There is no other way. If there are some minor problems, just replace the assembly. If the old parts are returned to the manufacturer and they don't agree to return them, then our factory will have to pay for it ourselves. It also shows our level.

It’s too bad, so if you don’t have any other option, don’t replace the assembly until the last step, which is a shame for yourself.” Zhang Taiqin lectured.

"Well, that's more convenient, but it doesn't show our true abilities, which is a bit embarrassing."

"That way I would look down on myself." Jiang Chengxin said.

"Okay, bring the plunger coupling and plunger spring we brought here, and let's replace them. It's getting late. We need to finish it before get off work. The customer will use the car tomorrow." Maybe it's a few hearty meals.

Because of this, Zhang Taiqin saw that it was not too early and hurriedly rectified all the faults before getting off work so that customers could use the car tomorrow.

Finally, I took the new plunger assembly and plunger spring that I brought and replaced them, started the car together, and solved the problem of insufficient power and no vibration when starting, and the car returned to normal.

"Master, is the plunger assembly also broken?" Lu Junying carefully observed the surface of the plunger and found that there was no wear and tear.

"Teach you a lesson again." Zhang Taiqin said: "This plunger assembly is not bad, but since the plunger spring has been replaced, it has been replaced by the way. How can the user know whether it is bad or not? It is not up to us to decide whether it is good or bad.

That's all." Zhang Taiqin said.

"Master, you are too insidious, but I like you." Jiang Chengxin said.

"That's not right!" Lu Junying scratched his head and said, "Master, the plunger parts are not broken. If you return to the supporting factory, won't you expose it? Will the other party accept it?"

Zhang Taiqin smiled and praised: "Not bad, you can think of this step." Then he used a sentence that the two of them did not expect: "Who asked you to return this plunger assembly to the manufacturer as a three-pack? It is an accessory.

Sold to users.”

Hearing the master's words, the two apprentices shouted in unison: "Learned another trick."