At this time, all the workers came back from lunch, and when they saw the situation here, they all gathered around.

Li Changjiang held his canned and bottled water cup, drank it, and looked this way, the scrapped label of this engine was put on by him, and he couldn't fix it no matter how he repaired it, so he had to give up.

Now, Qin Zhenhua put on a few rounds of sealant and said that it was repaired, but Li Changjiang didn't believe it.

"When we repair equipment, we don't just have to use our hands, we also have to use our brains." Since I let myself say it, then I said: "If you haven't analyzed the reason clearly, you can only dismantle it and start dismantling, then the machine can only get worse and worse, Master Liu, do you say yes?" If the army came up like this and dismantled it just now, this good engine would have to be dismantled. ”

With Zhao Guodong as the backing, Qin Zhenhua of course has no scruples, and he told everything just now, if you let Liu Dajun come up, you just want to dismantle this engine!

"Don't talk about this, tell me how you cultivated it." Liu Jianzhi's face is ugly, do you want to eat deflated again today? Hmph, how is this possible, Qin Zhenhua is obviously talking nonsense, avoiding the important and trivial, you can talk about how to cultivate it.

"I've looked through the maintenance records, and almost everything that can be replaced has been replaced, and the cylinders have even been re-ground, and if they are repaired, there is no value." Qin Zhenhua said.

This is internal repair, all kinds of parts are the original price, if it is an external accessories, such as the kind of car repair in later generations, the whole is more than dozens or even hundreds, and replacing a few parts is more expensive than buying a new engine.

Now, everything that should be replaced has been replaced, and it still can't be repaired, so of course it will be scrapped.

"However, we have changed everything that should be changed, and there is no problem, so I finally noticed this." Qin Zhenhua said: "I found that there are traces of oil leakage in the crankcase, which is very new, and it should be the oil leakage recently, so I deduced that its lack of power must be caused by the crankcase leakage." ”

"No kidding, even if the crankcase is leaking, what does it have to do with the lack of engine power? Again, it's not a piston ring leak. Liu Jianzhi retorted.

"Really?" Qin Zhenhua said: "It seems that Master Liu is still not familiar with the principle of the engine, if the crankcase leaks, it will cause the air pressure inside the crankcase to decrease, so that the reciprocating motion of the piston will be resisted, which leads to the reduction of the power of the engine, no matter what other parts are replaced, it is impossible to make it reach the rated power!" ”

Qin Zhenhua was on the ground, using a piece of chalk, to draw the basic structure, and then draw a few arrows, everyone understood that the air pressure inside would react on the piston, so that the normal operation of the piston would be subject to greater resistance!

"In addition to reducing power, air leakage will allow air to enter the crankcase, and under the crankcase is the engine oil, so that the oil will oxidize, further reducing the power of the engine, and once the oil jumps out, in the high-speed engine, it may produce spontaneous combustion! When we repair the engine, we can't let go of any small oil leakage, but the crankcase oil leakage is so serious, doesn't anyone see it? ”

"Lao Li, what did this kid say about you!" Liu Jianzhi glanced at Li Changjiang and said coldly, it was Li Changjiang who repaired it in the end, and now Qin Zhenhua said this, he was slapping Li Changjiang in the face.

"That's right, that's it!" Who knows, Li Changjiang didn't pay attention to Liu Jianzhi's words at all, but looked at Qin Zhenhua excitedly: "You're right, we lost confidence in the cultivation later, so we gave up the oil leak here, where do you know that the problem is actually here, let's try it on the stage!" ”

Li Changjiang doesn't care about Qin Zhenhua embarrassing him, repairing the machine, that is, depending on the technology, whoever has good technology, he will serve whom, the current Qin Zhenhua is very reasonable!

The motor in the workshop hummed, and the overhead crane lifted the engine and slowly hoisted it to the position of the bench.

The fuel tank was turned on, the hand pumped gas, the PTO shaft was connected correctly, and with the tom tom of the motor, the engine was started.

"Boost the throttle!" Li Changjiang shouted.

Zhao Guodong, Li Changjiang, Qin Zhenhua, they were all gathered at the front of the machine, and now, staring at the numbers on it.

"Three hundred horsepower!"

"Three hundred and fifty horsepower!"

"Four hundred horsepower!"

Sure enough, there was progress, just by sealing the crankcase, it had already 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 power of the engine continue to improve, when it reaches four hundred and fifty horsepower, it already has the conditions for installation, even if it is provided as a spare engine for the troops, and when it is needed, it is better than scrapping it directly!

"Four hundred and six, four hundred and seven!"

Eventually, it stabilized to four hundred and eighty and stopped moving.

In the roar of the engine, Liu Jianzhi was dumbfounded, and he really made this kid right! He just put the sealant on it, and it was close to 500 horsepower!

"You lost, five hundred and twenty horsepower engine, it can only reach four hundred and eight now, and what about the remaining forty horsepower?" At this moment, Liu Dajun shouted.

Have you fixed it? Of course not! If you don't reach the design value, you won't succeed! Now, only a layman like Liu Dajun can say this.

In the maintenance of the engine, it is normal to not be able to reach the original value, and it is absolutely enough to be able to repair it to this extent.

Qin Zhenhua's hand lifted the throttle lever of the engine up and lifted it to the position of turning off the engine, the engine snorted a few times, turned off, and the roar in the workshop disappeared.

"There are still forty horsepower left, because of the problem of oil, I just said, the oil has been oxidized, can not provide the best lubrication performance, our engine is supercharged, the lubrication is not good, the supercharger can not reach the highest efficiency, change to new lubricating oil, clean the oil circuit, five hundred horsepower must be no problem!" Qin Zhenhua turned his head and looked at Liu Jianzhi: "Master Liu, what do you say?" ”

At this point, Liu Jianzhi could only bow his head: "Yes, yes, change to a new engine oil, and it can almost meet the standard." ”

The whole machine has been replaced, and it is almost the same as the new one, and then the oil is changed, and it can really reach the calibration value.

"So, do you also think that my skills are excellent and I can evaluate the technical experts in the workshop?"

Yes? I didn't say that! I still want to rate it! For a moment, Liu Jianzhi didn't know what to say, Zhao Guodong watched it with his own eyes!