Chapter 123: Peeling off the cocoon, Jiang Hui shows off his power
“Judging from the current situation, there is no obvious wear and tear on the clutch plate of this gearbox. The problem should not be with the clutch plate.”
“Then let’s take a look at whether the various sensors and solenoid valves are loose.”
“In many common engine and gearbox failures, some parts are often not installed. Well, it caused the interface to become loose and the parts could not function properly.”
Jiang Hui ignored Kato Hiroyuki, who, after listening to Jiang Hui’s words for a long time, was also impressed by Jiang Hui’s technical strength. I have a basic understanding.
When the previous maintenance workers learned that the Crown used an electronic injection engine and an automatic transmission, they basically didn't even have the courage to take it apart to confirm the problem.
This situation is similar to the failure encountered by the American Liaison Office in Beijing.
But Jiang Hui was not only confident in repairing it, but also looked very skilled in the dismantling process.
Although Kato Hiroyuki was curious about why a young man like Jiang Hui was so familiar with the engines and gearboxes of new international models, he did not ask any more questions.
Seeing that there seemed to be little point in staying at the scene, Kato Hiroyuki finally left.
"Master, the little devil is gone."
Chen Chenxing saw Kato Hiroyuki walking away quietly and immediately said something to the side.
"It's better to leave. Let's quickly rule out the situation and repair the gearbox first."
Jiang Hui glanced at Kato Hiroyuki, who was about to disappear in the far corner, and prepared Solve the problem first and then think about other things.
“Well, there will be engine failure that needs to be repaired later. If you want to go back early today, you really need to hurry up.”
On the way here, Jiang Hui had already roughly mentioned today's arrangements.
Work hard in the morning and wrap up after lunch. Today’s car repair task is over.
“We will then take a look at the installation of these parts. Preliminary confirmation is that there are no problems.”
“Although these parts cannot be completely ruled out, there will be no problems, but before other problems are sorted out, We will not make further confirmation on the sensor and solenoid valve for the time being.”
“After all, it is difficult for us to confirm whether it is damaged through simple visual inspection.”
"It can only be judged by confirming the fault changes and other obvious fault phenomena after replacing it with new products..."
Jiang Hui continued to explain the situation to Chen Chenxing while quickly troubleshooting various problems.
“Let’s take a look at the transmission oil pump. Failure of the transmission oil pump will cause the hydraulic system to fail to work properly, affecting the shifting function and lubrication effect of the transmission.”
“It is considered a transmission failure. There are often problematic parts inside. "
Say Cao Cao, and Cao Cao will be there.
Just when Jiang Hui said that the gearbox oil pump often had problems and he removed it from the gearbox, he immediately discovered that the entrance to the oil line was full of dirt and impurities.
“Look, the oil circuit of the oil pump is blocked by impurities, dirt, etc., which will cause the oil pump to be unable to supply oil normally and affect the work of the gearbox.”
“The gearbox does not shift gears when the accelerator is pressed. , nine times out of ten, it was caused by a gearbox oil pump failure."
Jiang Hui's words made Chen Chenxing breathe a sigh of relief.
The fault has been found. It seems that today's car repair task can be completed successfully.
"Master, this oil pump is clogged. How should we clean it?"
Once the problem is found, we must consider how to solve it.
"This is not that complicated. Just take it apart and clean it, but you must be very careful during the disassembly process."
As Jiang Hui said, he changed tools and started to act.
“We need to loosen the oil pump bolts in a symmetrical and intersecting order to avoid damaging the aluminum alloy oil pump front end cover.”
"During disassembly, be careful to handle the front end cover and casing of the oil pump to prevent damage."
"After disassembly, use a clean rag and brush to thoroughly clean all metal parts of the oil pump."
“After cleaning, apply a little automatic transmission oil on the parts. When reassembling, be sure to ensure that all parts are installed correctly to avoid damaging the oil pump or other parts of the gearbox.”
In less than twenty minutes, Jiang Hui completed the disassembly, cleaning and reassembly of the oil pump, and then reinstalled the 4AT gearbox on the car.
Then Jiang Hui did not start the vehicle directly to confirm whether the gearbox fault had been eliminated, but continued to explain the Crown's 2.6L EFI engine with Chen Chenxing.
"We have just made a preliminary judgment that the engine failure is a sensor failure that causes the ECU to cut off the oil for protection, causing the engine to stall."
"The first thing to do now is to confirm whether each sensor is installed in place, and whether any of them is It's loose."
"The problem can be easily solved by finding the loose sensor and reinstalling it." With Chen Chenxing's help, Jiang Hui began to disassemble the engine.
Some sensors can be seen directly without disassembling any parts, but some require disassembling some parts before they can be seen.
Of course, whether it was necessary to disassemble the engine or not, Jiang Hui would do it.
On the one hand, it made Kato Hiroyuki realize that the fault of their vehicle was quite serious and it would be very laborious to repair. It was normal that other maintenance workers outside could not fix it.
On the other hand, it is also a process of teaching and self-learning.
Such a good opportunity cannot be missed.
“Engine sensors are an important part of the automobile engine management system. These sensors work together to provide key data support for the normal operation and optimal control of the engine, ensuring that the engine can operate normally under various working conditions. Work efficiently, reliably and meet emissions and performance requirements"
"There are nine common types of sensors on car engines. Let's confirm them one by one."
This basic knowledge has no technical content at all for Jiang Hui, but it is very rare for Chen Chenxing knowledge points.
The cultural level of Chinese car mechanics is generally not very high. It is very difficult for them to properly summarize various experiences and leave written records.
More often, they summarize and pass on their experience through word of mouth through the master-disciple relationship.
This kind of summary is often full of personal color and lacks systematicity.
It is very rare and very rare for someone like Jiang Hui to sort out various knowledge points and questions in a set, so that people can clearly understand the situation.
“The first one is the air flow sensor. Its working principle is to convert the air flow information into an electrical signal by measuring the air flow entering the engine.”
“It is to determine the engine progress. The key sensor of air volume provides accurate air volume data for the fuel injection system to ensure the appropriate fuel mixing ratio..."
"This is the camshaft position sensor. By detecting the position and angle of the camshaft, Produces corresponding signals, which are used to determine the opening and closing moments of the valve and ensure the normal valve timing of the engine..."
"This is the coolant temperature sensor. As the name suggests, its function is to measure the temperature of the engine coolant. Temperature, output corresponding electrical signal ”
"The engine's ECU combines information from the coolant temperature sensor to control the operation of the cooling fan, adjust the engine operating temperature, and correct the fuel injection amount and ignition advance angle..."
Jiang Hui disassembled the engine while finding various components Sensor location.
"Master, it seems that this sensor is not installed properly!"
Just as Jiang Hui pointed at a sensor and introduced it, the sharp-eyed Chen Chenxing had already felt that there was a problem with the installation of the sensor.
Jiang Hui directly shook his hand and said, "Yes, the throttle position sensor is loose."
"The function of this sensor is to monitor the opening of the throttle valve and convert it into an electrical signal."
"Its function is to reflect the engine load status and provide throttle opening information to the control unit. It is used to adjust the fuel injection amount and ignition advance angle. "
"Once a fault occurs, the ECU has no way to obtain an accurate signal. For the purpose of protecting the engine, it will send out a signal to shut down the engine. "< br>
“This can be regarded as a new fault that is prone to occur in EFI engines.”
Jiang Hui breathed a sigh of relief. The problem was easily solved. Today’s $1,600 was relatively easy to get.
Of course, even though the problem was found, it was already past eleven o'clock, so we definitely had to have lunch before talking about it.
The lunch at the Japanese embassy is definitely much richer than eating casually outside.
After all, Japan in this era is really not short of money.
People wave their money and "buy, buy, buy" all over the world. The main increase in sales of various luxury goods such as LV is contributed by Japanese people.
“Is the stalling of the EFI engine mainly caused by a sensor failure?”
After finding the problem, but unable to repair the car so quickly, Chen Chenxing naturally had more time to learn other maintenance knowledge from Jiang Hui.
"It's definitely not like this. This time I will judge that it is a sensor failure, and I will judge it based on some information from the fault light."
"We need to comprehensively sort out the EFI engine The problem of stalling should start with the working principle of the electronically controlled fuel injection system. "
"Why have I been asking you to read more books like "Automotive Structure" and "Principles of Internal Combustion Engines" during this period, and more. Go to the supporting factory to understand the situation, because if you know the working principle of each part, you can better understand the cause of the failure and the repair method. "
There is still some time before lunch, so Jiang Hui is ready. Explain to Chen Chenxing about repairing the car.
Chen Chenxing has helped him a lot during this period, and this apprentice is still very qualified.
Since he is so interested in repairing cars, let him teach him a lesson.
Maybe in the future Chen Chenxing can go out and open a car repair shop, or even a car modification factory, and there will be some intersection with his own car empire.
(End of this chapter)