Chapter 73 On-site teaching

The master and apprentice came to the repair shop. Li Guangyuan and Wei Jianan were inside. Seeing Master Li Wenkai coming, they stood up and greeted Li Wenkai.

It was already dark, and the battle was around the night. The winter in Yanjing was very dark. At around 8 o'clock, the lights were already everywhere. The cold wind was howling, and the heavy snow was like a dart in the master's hand, flying arrows with cold air.

"This ghost weather is so cold. Tomorrow, Shen Zhengjun, you go to the unit's logistics department to see if you can put a coal stove in there." Li Wenkai said.

Originally, I could buy it myself, but this is the unit, so it is reasonable to ask the unit to pay. Although I don’t lack food and clothing, I am very short of money.

"Okay, I'll do it when I go to work tomorrow." Shen Zhengjun responded.

"Close the door." Li Wenkai said, "Let's start repairing the car."

When Li Guangyuan and Wei Jianan heard this, they were going to start repairing the Benz and shut the door and not let others see it.

Li Guangyuan ran over quickly and clanged, closing the door.

Li Wenkai opened the front engine cover and pointed to a nameplate behind the engine and introduced: "Before this, let's take a look at the data of this car and the whole vehicle. This nameplate all contains basic data such as manufacturing, factory, factory date, etc."

"This is a Mercedes-Benz W116 produced in the fall of 1978 last year. The body size is 4960mm long, 1870mm wide, 1410mm high, 2865mm wheelbase, and 1665kg body weight."

"The power of 193 horsepower is slightly inferior to the North American version of the 450 se model. At the same time, Mercedes-Benz released the 450 se model, which extended the wheelbase by 100 mm on the basis of the 450 se to provide more legroom for rear passengers."

"The Mercedes-Benz W116 is a Mercedes-Benz first luxury model produced in 1972-1978. It is a milestone in the development history of Mercedes-Benz S-Class, and the most important model in history - the code name w116."

Li Wenkai introduced the basic situation of Mercedes-Benz W116, including R&D back and basic supporting facilities. Thinking of a new milestone technology used in this car, Li Wenkai continued: "In this car, a new technology is also used - an anti-lock braking system, called abs in English."

The abs system is the crystallization of the technology developed by Mercedes-Benz and Bosch, and has made outstanding contributions to the active safety of automobiles.

The four people on one side were confused.

"Master, what is an anti-lock braking system?" Zhou Aiguo asked.

"Good question, anti-lock braking system, as the name suggests, is the most new technology of brake brake system. In the traditional brake system, that is, Jiefang Yuejin truck, the brakes used are all kicked down. Driven by the brake sub-pump, the two brake pads are directly opened, creating a huge friction with the inner side of the wheel hub, thereby producing a braking effect. This brake system has one disadvantage, that is, the wheels will directly lock the wheel hub, and the wheels will continue to slide forward in a complete braking state, especially in the sudden brake on rainy days, which can easily cause the vehicle to lose control and slide sideways and cause a car accident. All experienced masters who have made Jiefang Yuejin will not kick directly when stepping on the brakes, but will avoid this situation."

"The anti-lock braking system, working principle, when braking, the abs can quickly determine the locking state of the wheel according to the speed signal transmitted from each wheel speed sensor, and close the normally open input solenoid valve on the wheel to keep the braking force unchanged. If the wheel continues to lock, the normally closed output solenoid valve will be opened. The braking pressure on this wheel will quickly move down due to the emergence of a pipeline through the brake fluid reservoir. The two states of opening, closing, opening and closing are constantly reciprocating. In such a high frequency, the vehicle will prevent the vehicle from locking the wheel completely due to excessive braking force. The vehicle will continue to slide forward in the rolling and sliding state, with the slip rate being about 20%, to ensure the maximum adhesion between the wheel and the ground."

Li Wenkai introduced the basic situation of the bas. Seeing the two apprentices confused, Li Wenkai said: "You only know that there is such a thing now. This is the latest technology. It is only available in Mercedes-Benz cars and not in trucks. For you, its work is equivalent to the same principle as the driver stepping on the brake dozens of times in a very short time. Remember that its abbreviation is abs. If someone asks or sees it in the future, it is enough. As for repairs, when the time is ripe, I will teach you." Li Wenkai said.

"Okay." After Zhou Aiguo said to Shen Zhengjun, he took out his notebook from his pocket and recorded it.

This made Li Wenkai very satisfied. After the two of them recorded it, Li Wenkai continued to talk about launching this engine.

"This is a 4.5-liter V8 engine with a maximum power of 225 horsepower (165kw)/5000rpm and a maximum torque of 378n·m/3000rpm." Li Wenkai said, pointing to the data on the engine nameplate.

"Master, this is all in English!" Shen Zhengjun was amazed as if he was reading a book of heaven, looking at the dense English words on the nameplate.

At the same time, the four of them sighed in their hearts that their master (brigade commander) was so good at English that they could understand all this.

"Did you see these '4.5l' and 'v8'?" Li Wenkai said, pointing to the engine's nameplate.

The two of them squeezed over and saw the nameplate nodding.

"You two come and have a look, too." Li Wenkai said to Wei Jianan when he looked at Li Guangyuan standing aside.

"Thank you, Brigade Commander!" The two of them said gratefully to Li Wenkai when they heard Li Wenkai's words.

The two knew that Li Wenkai took this opportunity to teach his apprentice on the spot tonight. He was just an auditor. He didn't expect that the brigade commander cared about him so much and asked him to watch it too.

The two were a little flattered.

Although the two did not understand English, they also knew Arabic numerals. They nodded and then retreated.

Li Wenkai continued to popularize science and said: "The '4.5l' here refers to the engine displacement. What is the specific displacement? It is a very professional thing. Generally speaking, it is the sum of the combustion chamber volumes in all cylinders of the engine. Remember, it is the volume. Of course, if you use it more professionally, this statement is not accurate. For you, this is enough to understand it in this way." Li Wenkai paused for a moment, and saw that his current apprentice finished recording, and then said: "This 'v8' refers to the engine arrangement form. For example, the common liberation leap forward is inline, which is usually omitted. The word v means that the engine cylinder and crankshaft are arranged in a V shape, divided into two rows, with a total of 8 cylinders." Li Wenkai said, pointing to the two rows of rocker arm covers.

Both apprentices are laymen, so Li Wenkai was very patient when explaining the most basic data of these engines.

"The 8 cylinders are divided into two rows evenly. How much is each row?" Li Wenkai looked at Shen Zhengjun and asked.

"Master, isn't this bullying? No matter how stupid I am, I know it's 4." Shen Zhengjun scratched his head and replied embarrassedly.

"Haha." The others laughed.

Li Wenkai spoke patiently, and the two of them listened very seriously, and they kept recording there from time to time. Li Wenkai also stopped and waited until they recorded it before continuing.

Next, Li Wenkai talked about the basic names of maximum power, maximum torque, and cylinder bore.

At the same time, the names of the components that can be seen when exposed outside of the engine are pointed out, such as starting point machine, engine, brake fluid tank, how to check engine oil, etc., are known for the most basic engine maintenance.

"Okay, I'm talking about some of the most basic names of the engine. Next, let's talk about the failure of this car."
Chapter completed!