Siheyuan: I am different He Yuzhu

He Yuzhu jumped off the Dodge truck, dusted off his hands, and said to the repairman Hu Baokui with a smile: "Master Hu, now that we have a scrapped truck, we can finally get started. Although many parts of this car have been dismantled, the most important engine is still preserved. Let's start with the engine."

Hu Baokui narrowed his eyes at the truck and said, "Deputy Director He, just give me your orders. We'll do whatever you say."

"Okay, I'm going to be very aggressive. If I do something wrong, you must remind me in time. Then let's remove the engine from the engine compartment first, and then completely disassemble the engine to see what's wrong with the engine that caused it to be scrapped and cannot be repaired."

After He Yuzhu finished speaking, Hu Baokui said to the workers next to him: "Okay, stop standing there and get to work."

Under the command of Hu Baokui, the workers loosened the screws that fixed the engine in a short time, and then carefully used a manual crane to slowly lift the engine out of the engine compartment in front of the truck.

While the workers were dismantling the engine, He Yuzhu ran back to the logistics office to get the work clothes he had prepared, changed into them, and hurried back to the repair shop. When He Yuzhu arrived at the repair shop, the workers had just lifted the engine out of the truck's engine compartment and put it on the ground.

After completing the acceptance formalities, Fan Youxiang saw He Yuzhu wearing a work suit and asked curiously, "Deputy Director He, why are you dressed like this?"

He Yuzhu smiled and said, "Chief Fan, since I applied to my superiors for permission to copy the Dodge truck, I have been learning about trucks on my own. No matter how much knowledge I read in books, it is not as intuitive as personal practice. So I want to use this opportunity to disassemble the engine to verify the results of my recent study."

After listening to this, Fan Youxiang said with admiration: "Deputy Director He, you are amazing. You can actually learn truck knowledge by yourself by reading books. I can't do that. I am a rough man. I get sleepy when I read books. I know many words in the book, but I can't understand them when they are put together."

After listening to Fan Youxiang's words, He Yuzhu laughed and said, "Chief Fan, you are such an interesting person. Well, Chief Fan, I won't chat with you any more. I have to go over and learn from the workers. You should get busy too."

Fan Youxiang hurriedly said, "Deputy Director He, if there is anything you need cooperation with, just let me know."

"Chief Fan, you are too polite. I won't be polite when I really need help." After saying that, He Yuzhu came to the dismantled engine.

When the workers saw He Yuzhu wearing the same work clothes as them, they couldn't help but admire him from the bottom of their hearts. He Yuzhu saw Hu Baokui squatting on the ground observing the engine, so he squatted down and observed it carefully.

The engine in front of me is a six-cylinder gasoline engine, which is cast iron as a whole. According to the information He Yuzhu found in the library, the maximum power of this engine is 118 horsepower (2800 rpm) and the displacement is 5.4 liters. It is equipped with a five-speed manual transmission and has a maximum speed of 64 kilometers per hour when loaded with a load of three tons. The engine in front of me should have been produced by America around 1945, which is more than 10 years ago. It has higher horsepower than the engine of the CA-140 truck produced by the Northeast Automobile Factory this year.

Alas, I can only say that Xiaguo's industrial foundation is still too weak. No, to be precise, there is basically no industrial foundation. It is just poor. Western countries have been on the road for nearly 70 years since the first industrial revolution. How can they easily catch up with the accumulation of nearly years? Fortunately, before I traveled through time, after more than years of hard work, many fields have caught up with Western countries, and even surpassed them in some fields. Since I am here, I will also contribute a little bit of my own strength.

After looking at it for a while, He Yuzhu said to Hu Baokui, "Master Hu, let's not just look at it, let's take it apart directly. Once we take it apart, we will know what the problem is."

"Okay, I'll listen to you and let's get started. Xiaotian, go get the tools for dismantling the engine." Hu Baokui turned around and instructed Tian Jianghao.

When Tian Jianghao heard what Hu Baokui said, he quickly ran to the tool storage area in the repair shop, and then came back with a large box of tools. He Yuzhu saw Tian Jianghao put the tool box aside, so he walked over to the tool box and tried to find a wrench to remove the engine cover.

Tian Jianghao saw this and asked hurriedly: "Deputy Director He, what are you going to do?"

He Yuzhu smiled and said, "I must have come to the toolbox to get the tools!"

Tian Jianghao said anxiously, "What are you doing with the tools?"

"Oda, I must have taken the tools to dismantle the engine, what else can I do."

Tian Jianghao looked at Hu Baokui and stopped talking. He Yuzhu turned to look at Hu Baokui and asked, "Master Hu, what's wrong? Can't I disassemble the engine?"

Hu Baokui smiled and said, "Deputy Director He, Xiaotian didn't mean that. Disassembling an engine is a dirty job. Xiaotian was just afraid that you might get your clothes dirty. After all, once an engine is disassembled, it will be covered with oil stains. Look at the clothes of our maintenance workshop workers, there are few oil stains on them."

"What's wrong with the oil stains? Isn't it normal to have oil stains when doing this? I used to wear oil on my apron when I cooked in the cafeteria. I can just wash it. If I can't wash it, it won't affect my wear. Okay, Xiaotian, don't worry about it. Don't worry, my clothes are dirty, and I won't ask you to help me wash them. Master Hu, just tell me what size wrench you use."

Hu Baokui stopped talking and said directly, "You need a No. 14 wrench to remove the engine cover. Xiaotian, find the No. 14 wrench and hand it to Deputy Director He."

Tian Jianghao quickly opened the toolbox and found wrench No. 14 and handed it to He Yuzhu. He Yuzhu took the wrench and came to the engine and asked, "Master Hu, are the screws on the engine forward or reverse?"

"In reverse."

After listening to this, He Yuzhu took the wrench and stuck it on the screw and started to twist it in the opposite direction. While twisting the screw, he said to the maintenance worker next to him: "Hey guys, do you know the working principle of the engine?"

The maintenance workers looked at each other and shook their heads. He Yuzhu looked at Hu Baokui who was also tightening the screws. Hu Baokui answered directly and generously: "Deputy Director He, I have only disassembled the engine. As for the working principle of the engine, I don't know. If you know, please tell us later."

"Okay, after I take the engine apart, I'll use it to explain it to you all."

The two men quickly removed all the screws on the engine cover. He Yuzhu and Hu Baokui each lifted one side of the engine cover and gently lifted it off the engine. After the cover was removed, the engine combustion chamber was exposed to everyone. He Yuzhu stretched out his hand and pushed the piston, but found that it could not be pushed at all. Then He Yuzhu tried to move the engine's power output shaft, but it still did not move. Combining the knowledge he learned from books, He Yuzhu speculated that the piston in a cylinder might be stuck on the cylinder, which caused the piston to not move normally.

He Yuzhu looked up at Hu Baokui and asked, "Master Hu, can this be repaired?"

Hu Baokui observed it for a while, then reached in and pressed the piston of the engine, only to find that it did not move. He then frowned and replied, "Deputy Director He, this is the first time I have encountered such a situation. I don't know if it can be repaired."

He Yuzhu stood up and said to the workers watching nearby: "Everyone come closer, I will first explain to you the working principle of the engine, and then I will tell you about the problem of this engine."

Seeing this, the workers hurriedly approached He Yuzhu and surrounded him. He Yuzhu asked, "The engine in front of you is a 6-cylinder gasoline engine. Gasoline engines are a type of reciprocating piston internal combustion engine. Diesel engines are also reciprocating piston internal combustion engines. Reciprocating piston internal combustion engines mix fuel and air and burn them in their cylinders. The heat energy released generates high-temperature and high-pressure combustion gas in the cylinders. The expansion of the combustion gas pushes the piston to work, and then the mechanical work is output through the crank-connecting rod mechanism or other mechanisms to drive the driven machinery to work."

A worker asked, "Deputy Director He, it's obviously a gasoline engine, why is it called a reciprocating piston internal combustion engine?"

"Why is it called a reciprocating piston internal combustion engine? This is related to the principle of engine movement." He Yuzhu pointed to the piston in the engine and said, "This thing is called a piston. After the engine starts, the gasoline burns in the area above the piston, and then pushes the piston down. When the gasoline in this cylinder is fully burned, the piston reaches the bottom of the cylinder. When the piston of this cylinder moves to the bottom, it will push up the pistons in other cylinders. When the piston of this cylinder reaches the bottom, the gasoline in the cylinder with the piston at the highest point next to it will burn, and then the burning gasoline will push the piston down. The piston keeps moving up and down in the cylinder, which can keep the engine working continuously. That's why the gasoline engine is called a reciprocating piston internal combustion engine. Do you understand?"

"Understood." All the workers answered in unison.

Tian Jianghao raised his hand after everyone finished speaking and asked, "Deputy Director He, how did the gasoline get in and how did it catch fire?"

"Oda, this is a good question. This is what I'm going to talk about next. I just told you about the working process of the piston inside the engine cylinder. Next, I'm going to tell you about the working principle of the engine. There are four steps in the operation of the engine. The first step is to take in air. When taking in air, the carburetor at the inlet end of the intake pipe mixes air and gasoline in a certain proportion, and then supplies them into the cylinder through the intake pipe. After the intake is completed, it is the second step, which is compression. The piston moves upward to compress the gasoline and air that have just entered the cylinder. When the piston compresses the gasoline and air to the limit, it is time to proceed to the third step."

"The third step is to do work, which is combustion. When the gasoline and air in the cylinder are compressed to the limit, the spark plug on the engine cover will emit sparks, which ignite the mixture of gasoline and air. The ignited mixture will expand due to heat, which can push the piston down. The fourth step is exhaust. In the third step, when the piston reaches the lowest point, it will move back. At this time, the exhaust port on the top of the cylinder will open, and the exhaust gas inside can be discharged from the cylinder."

"Of course, I'm only talking about the general steps. In practice, the engine requires the coordination of many parts, such as the ignition time of the spark plug, the closing and opening of the intake and exhaust ports, etc. These all have certain rules. Once we understand these principles, we can start to imitate the engine. But don't feel pressured. We now have a physical object to refer to. We don't need to start from scratch. We just need to imitate the current engine, which is easier than the person who first invented the engine."

"According to what I've read in books, the engine piston can be moved with just a slight push. The piston of this engine can't be moved at all. I suspect the piston is stuck in the cylinder, which is why it can't be moved. As long as we can pull the piston out, we might be able to fix the engine."

Hu Baokui asked, "Deputy Director He, I just tried pushing it with my hands, but it's stuck so tightly that I can't move it at all. How can we pull the piston out? If we force it out, I'm worried that it will damage the engine cylinder. By the time the piston is pulled out, the engine will be completely scrapped and there will be no value in repairing it."

He Yuzhu touched his chin and thought for a while before saying, "Master Hu, have you heard of thermal expansion and contraction? If we put the engine casing on the fire to heat it, the casing will expand due to the heat, and the diameter of the cylinder will also increase. In this way, we may be able to pull the piston out. But before trying, we still have to remove the bottom shell to determine whether there is a problem with the piston."