Hongshan Auto Repair Shop is a family workshop-style mom-and-pop shop not far from here, which is very small in scale and naturally not high in technology. Pen, fun, pavilion www. biquge。 info

Hearing Meng Wentian's words, Guo Qiulan was stunned for a moment, and wanted to say something, but she didn't say it: Boy, don't you want me to hang that banner? Now that you have come to Hongshan Automobile Repair Factory to repair a car that you can't repair, why do you retreat? Zeng Ninghai What kind of car will they repair, except for Master Xu Sanfan, they are just a few apprentices, that is, they inflate tires and give mechanics a hand.

She vaguely felt that something was wrong today, and blamed herself for not insisting on taking down the banner just now. She even regretted a little that she listened to Meng Wentian's words and did something big before the Spring Festival.

She thought so, Zeng Ninghai, Liu Wenbo and others also thought so. Originally, they wanted to come over to see how Meng Wentian repaired the car, but after listening to Meng Wentian's words, several people couldn't help but glance at each other, and their pace involuntarily slowed down a lot.

Liu Wenbo stubbornly said, "I'll take a look first." ”

He returned from the army and during his service repaired military trucks on the Tibetan line. But his skills are not very high, and he is not enough to get a technician certificate. Knowing that the car had been repaired by someone else but had not been repaired, he was naturally a little timid.

He was timid, and the two apprentices, Zeng Ninghai and Wang Debao, were even more daring.

Seeing them cowering, Guo Qiulan glanced at Meng Wentian depressedly again.

Liu Wenbo climbed into the cab, restarted the engine, and drove it to the open space in front of the workshop to make a U-turn and drive it onto the road. A few minutes later, he drove the truck back, turned off the engine, jumped out of the car, and said with some uncertainty: "It should be the steering machine......

Before his words fell, the driver retorted with great certainty: "It can't be a problem with the steering machine...... , The master of Hongshan Automobile Repair Factory has checked the booster pump, hydraulic oil or something, and there is no problem. I also spent 100 yuan to change the hydraulic fluid. …… It's a shame on me. ”

Meng Wentianchao's Liu Wenbo, who was a little embarrassed, asked: "When you turn the steering wheel, do your hands feel heavy?"

The driver hurriedly replied: "Not heavy, not heavy at all." ”

But Meng Wentian did not give up his inquiry about Liu Wenbo, and his eyes were still looking at him. After all, the expression ability of truck drivers is not necessarily strong, and many truck drivers deliberately conceal the degree of failure before starting maintenance, and wait until the two sides negotiate the maintenance price before talking about more serious problems, and it is even more shameful that they have been concealing it, so that you can not find it out and always say that it is not repaired.

Seeing that Meng Wentian continued to stare at him, waiting for himself to explain further, Liu Wenbo smiled embarrassedly and continued: "The steering wheel rotation is indeed not heavy, and the degree of throwing the steering wheel is not large. ”

Meng Wentian said: "The steering wheel is not heavy, which means that the booster pump is fine, and the hydraulic oil and filter element are fine." …… , Liu Gong, if it wasn't for the problem of the steering machine, do you think there are any other problems?"

Liu Wenbo shook his head, but said uncertainly: "It's not the problem of the direction machine?...... , whether the steering lever is broken, or the pressure of the front and rear tires is uneven. ”

Meng Wentian smiled and said to Zeng Ninghai: "Tell me your opinion." ”

Zeng Ninghai glanced at Guo Qiulan a little flustered, and replied uncertainly: "Maybe the braking system does not reset, and a certain tire has a brake when it is driven." ”

Meng Wentian snorted and said, "Since everyone has said so many problems, let's verify and eliminate them one by one." ”

Liu Wenbo and Zeng Ninghai were all surprised: you must know that this kind of rural truck is not worth much, and farmers are reluctant to pay, if they replace parts or something, maybe they can make a little more hard money from the difference in the price of parts, if the fault is repaired purely by hand, and the driver may only be willing to pay a little money, thankless. Examine all the possible causes, how can we have so much time? And it's not worth it.

The truck in front of me was covered in mud, and it would take a lot of time and effort to open it to check it, and it would make it dirty.

Seeing their embarrassed looks, Meng Wentian said: "You can first eliminate those places that have been repaired or inspected by the Hongshan Auto Repair Factory, and start from the parts you have in mind. ”

Listening to Meng Wentian's words, Guo Qiulan had a strange feeling in her heart, feeling that the young man in front of her was simply a highly skilled and well-established senior technician. He seemed to be lecturing Liu Wenbo and them, yes, he spoke in a tone like a teacher taking students to practice.

The truck driver was also stunned when he heard this: Could it be that this kid can repair cars, and his skills are higher than others'?

Liu Wenbo shook his head and denied: "Who knows what places they repaired or inspected, I guess this driver doesn't know." ”

Meng Wentian put away his smile and said, "If you want to improve your skills, then you need to think more, do more, and watch more." If you don't even know where others have moved, it means that you don't care at all. This kind of dirty truck, as long as it moves, it will definitely leave a lot of traces, if you put your heart into it, how can you not find it?"

Listening to Meng Wentian's words, several young people showed shame on their faces.

Only Guo Qiulan was happy in her heart, because she had long been dissatisfied with these young employees getting by, they had never regarded car repair as their own business, let alone studied technology.

Meng Wentian said to the three of them: "You follow me, we will treat it as a broken car that we have just taken over today, and we will observe and judge together." …… When we receive a faulty car, we should first judge whether the fault is localized or vehicle-based, or implicated. Localized faults are naturally easy to solve, such as broken window glass, which is replaced. The overall fault can also be said to be solved, and from the time of taking over, I was already mentally prepared and decided to overhaul the faulty car. The most troublesome thing is implication, until the cause of the fault is determined, you don't know the size of the failure, and you don't even know how to start......"

Not only Zeng Ninghai and the three of them listened carefully, but also Guo Qiulan and the truck driver listened very seriously.

Walking to the rear wheel, Meng Wentian said to Zeng Ninghai and them: "The inflation of the tires can also affect the deviation of the truck. …… , Zeng Gong, tell me, why does the inflation of the tires make the car deviate?"

Zeng Ninghai thought for a while with a bitter face, and said, "Is it that the under-inflated tires can't roll and drag the car?"

Meng Wentian nodded and said, "Yes." The rolling friction of the under-inflated tire is large, and this friction is transmitted to the differential on the rear axle, and the torque distributed by the differential to the tire is small, so it will naturally not run fast. As a result, the tires run fast on one side and the tires on the other side run slowly, can the truck not deviate?...... In addition to causing different rolling friction of the tires, the lack of air pressure can also produce a reason for the car to deviate, can you tell?"

Zeng Ninghai touched the back of his head and shook his head embarrassedly: in fact, he couldn't even say the professional word rolling friction for a while.

Liu Wenbo behind him said: "Is it because of insufficient inflation that the outer radius of this tire is smaller than the normal outer diameter of the tire?"

Meng Wentian smiled and agreed: "Yes! When the tire pressure is insufficient, the radius of the deflated tire will be short, and the tire circumference will be small." Even if the left and right tires rotate at the same speed, the distance taken by a deflated tire in one turn, that is, the circumference, is naturally shorter than that of another tire. One runs a long distance and the other runs a short distance, so won't the truck go off?"

Several people nodded in realization.

The truck driver said happily: "Little master, what you said is so good, I can understand it! Next time I have to pay attention to it, and I can't let the two sides of the tire inflation be different." ”

Meng Wentian smiled and said: "Actually, not only the tire pressure, but also the pattern on the surface of the tire, if it is different, it will also affect the rolling friction, and it will also cause the truck to deviate." ”