At this time, all the workers came back from lunch. When they saw the situation here, they all gathered around.
Li Changjiang was holding his own water cup from a can bottle, drinking from it, and looking this way. He had put the scrapped label on this engine. He couldn't repair it no matter how hard it was, so he had to give up.
Now, Qin Zhenhua just applied a few rounds of sealant and said it was repaired, but Li Changjiang didn't believe it either.
"When we repair equipment, we not only have to do it with our hands, but also with our brains." Since I was allowed to say it, I said it myself: "If you start to dismantle it without analyzing the reason clearly, the machine will only get worse and worse. Liu
Master, do you think so? If the army had just come up and dismantled it like this, this fine engine would have been destroyed."
With Zhao Guodong as his backing, Qin Zhenhua certainly had no scruples. He told what happened just now. You asked Liu Dajun to come up and dismantle it, just to dismantle the engine!
"Don't talk about this, tell me how you repaired it." Liu Jianzhi's face looked ugly. Do you want to be depressed again today? Huh, how is this possible? Qin Zhenhua is obviously talking nonsense, avoiding the important and ignoring the light. You want to talk about how to repair.
Yes.
"I looked through the maintenance records, and almost everything that could be replaced has been replaced. The cylinder was even reground. If it is repaired again, it will have no value," Qin Zhenhua said.
This is an internal repair, and all parts are at the original price. If it is an external accessory, such as the kind of car repair in later generations, the price is easily tens or even hundreds. If you replace it with a few parts, it will be cheaper than buying new.
An engine is even more expensive.
Now, everything that needs to be replaced has been replaced, but it still can't be repaired, so of course it will be scrapped.
"However, we have already replaced everything that needs to be replaced. It is said that there is no problem, so I finally noticed it." Qin Zhenhua said: "I found traces of oil leakage in the crankcase. This trace is very new and should have been recently.
The oil just leaked, so I concluded that its loss of power must be caused by leakage in the crankcase."
"Don't be ridiculous, even if the crankcase is leaking, what does it have to do with the engine's lack of power? It's not a piston ring leaking," Liu Jianzhi retorted.
"Really?" Qin Zhenhua said: "It seems that Master Liu is still unfamiliar with the principle of the engine. If the crankcase leaks, it will cause the air pressure inside the crankcase to decrease. In this way, the reciprocating motion of the piston will be resisted.
This results in a reduction in the engine’s power, and no matter what other components are replaced, it is impossible to make it reach the rated power!”
Qin Zhenhua used a piece of chalk on the ground to draw the basic structure, and then drew a few arrows. Everyone understood that the air pressure inside would react on the piston, causing greater resistance to the normal operation of the piston!
"In addition to reducing power, air leakage will allow air to enter the crankcase. Under the crankcase is the engine oil, which will oxidize the engine oil and further reduce the power of the engine. Moreover, once the engine oil jumps out, in the engine running at high speed, it will
Spontaneous combustion may occur! When we repair the engine, we cannot ignore any small oil leakage. However, if the oil leakage in the crankcase is so serious, wouldn't anyone notice it?"
"Old Li, this guy is talking about you!" Liu Jianzhi glanced at Li Changjiang and said coldly, it was Li Changjiang who repaired the car last. Now Qin Zhenhua said this, it was a slap in Li Changjiang's face.
"Yes, that's it!" Who knew that Li Changjiang ignored Liu Jianzhi's words at all, but looked at Qin Zhenhua excitedly: "You are right, we later lost confidence in cultivation and gave up on the oil leak here. Who knew
The problem actually lies here, get on the bench, let’s get on the bench and try it!”
Li Changjiang doesn't care if Qin Zhenhua embarrasses him. Repairing machines depends on technology. He will obey whoever has better technology. What Qin Zhenhua says now makes sense!
The motor in the workshop was buzzing, and the overhead crane lifted the engine and slowly lifted it to the stand.
The fuel tank was connected, the gas was manually pumped, the power output shaft was connected correctly, and the engine was started amidst the sound of the motor.
"Increase the accelerator!" Li Changjiang shouted.
Zhao Guodong, Li Changjiang, and Qin Zhenhua were all gathered at the front of the machine, now staring at the numbers on it.
"Three hundred horsepower!"
"Three hundred and fifty horsepower!"
"Four hundred horsepower!"
Sure enough, there has been progress. Just by sealing the crankcase, the power has been increased to 400 horsepower!
"Four hundred and fifty horsepower!"
The power of the engine is related to the speed. The higher the speed, the greater the power. Now I am watching the engine power continue to increase. When it reaches 450 horsepower, it is ready for installation, even if it is used as a backup.
The engine is provided to the troops and replaced when needed, which is better than scrapping it directly!
"Four hundred six, four hundred seven!"
Finally, it stabilized to 480 and stopped moving.
Amidst the roar of the engine, Liu Jianzhi was dumbfounded. This guy really got it right! He only applied sealant and the output was close to 500 horsepower!
"You lose. The 520-horsepower engine can only reach 480 horsepower now. Where is the remaining 40 horsepower?" At this moment, Liu Dajun shouted.
Have you repaired it? Of course not! If it does not reach the design value, it has not been successful! Now, only a layman like Liu Dajun can say this.
It is normal for the engine to fail to reach the original value during maintenance. If it can be repaired to this level, it is definitely enough.
Qin Zhenhua's hand lifted the engine's throttle lever up to the stalling position. The engine purred a few times and stalled, and the roar in the workshop disappeared.
"There are still forty horsepower left because of the engine oil problem. As I just said, the engine oil has been oxidized and cannot provide the best lubrication performance. Our engine is supercharged and the lubrication is not good. The supercharger
It cannot achieve the highest efficiency. If you replace it with new lubricating oil and clean the oil circuit, it will definitely be no problem to increase the power to 500 horsepower!" Qin Zhenhua turned his head and looked at Liu Jianzhi: "Master Liu, what do you think?"
At this point, Liu Jianzhi could only bow his head: "Yes, yes, replace it with new engine oil and it will almost meet the standard."
The entire machine was replaced with everything that could be replaced, and it was almost as good as new. After replacing the engine oil, it was able to reach the calibrated value.
"So, you also think that my skills are good enough to be evaluated as a technical expert in the workshop?"
Ah? I never said that! I still want to comment! For a moment, Liu Jianzhi didn’t know what to say, and Zhao Guodong was watching it with his own eyes!