What is the compression? The pressure in the combustion chamber at the end of the compression stroke. It can bleed through the piston rings or through the valve mechanism. In the first case, the repair involves only the replacement and the second is quite possible to do without it. Let's consider such situation on the example of the engine of VAZ.
First of all, it should be said that this procedure is called "lapping the valves". In the process of operation on the valve seats formed soot, which prevents them from closing completely. Thus, lapping of the valves avoids this problem. How to determine what they need lapping? The answer is simple. If you fell the compression in the cylinders, then this operation is simply necessary. The fact that the valves need lapping in such engines, a resource which is already a little exhausted, and the unit is already not full of energy.
Initially between the saddle and the belt, the valve formed by the gap due to wear of the latter. As “cotton” when the closure is quite strong, over time, the edge goes astray and broken geometry fit. Then the gap gets unburned mixture, which is simply consueta on the corbels of the valves, which makes the gap even more. Usually such problems happen mostly with the exhaust valves, because the intake "polished" of the incoming flows. In addition, there are no obstacles to air flow, and at the time when the temperature is highest, the valves are in the closed state.
Now just how is lapping the valves. VAZ categorically denies the owners of these cars to perform the grinding by the drill. According to them, so it is impossible to produce the desired force. But the fact is that stress is something just not required. If it is to make, the saddle will be worn unevenly. In this case, the valve would be inaccurately centreman that will lead to the appearance of the gap on one side. It is fraught with the above consequences. And still lapping valves with a drill may not be as efficient as possible when using the special set.
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It is made in three stages. Their sequence depends on the grit of lapping compound that is changing in the process. If lapping of valves in a drill, then clamped the pin with the same diameter as the rod. One end of the hose is put on this pin and the other on the valve. Then the saddle and the belt is lubricated with paste, and then exhibited a small speed of rotation. If they are too young, it's not terrible - slightly increased running time.
If they are large, there is a risk of overheating and saddles, and valves. Then they will have a distinctive blue stripe. This is a sure sign of overheating. After the initial processing is erased paste, then rubbed the next smaller grit. After applying a third paste surface is carefully cleaned with kerosene. Then you need to grease with engine oil and repeat the lapping procedure, following the “speed”. It provides tight closing.
Well, after that, the compression in the cylinders will increase significantly. It should be remembered that the engines, compression ratios less than 8, very sensitive to it. It greatly affects the ease of use, so grinding of valves can be carried out even between overhauls, for example, after 20 000 km.
Article in other languages:
AR: https://tostpost.com/ar/cars/21251-how-is-lapping-the-valves.html
BE: https://tostpost.com/be/a-tamab-l/38785-yak-pravodz-cca-pryc-rka-klapana.html
DE: https://tostpost.com/de/autos/38341-wie-ist-das-l-ppen-der-ventile.html
ES: https://tostpost.com/es/coches/38110-c-mo-se-realiza-el-asentamiento-de-las-v-lvulas.html
HI: https://tostpost.com/hi/cars/22841-lapping.html
JA: https://tostpost.com/ja/cars/20824-how-is-lapping-the-valves.html
KK: https://tostpost.com/kk/avtomobil-der/39186-alay-klapandardy-ys-ylau.html
PL: https://tostpost.com/pl/samochody/40811-jak-jest-docieranie-zawor-w.html
PT: https://tostpost.com/pt/carros/40487-como-feita-a-lapida-o-de-v-lvulas.html
TR: https://tostpost.com/tr/arabalar/35684-nas-l-yap-l-r-al-t-rma-vana.html
UK: https://tostpost.com/uk/avtomob-l/39604-yak-provodit-sya-pritirannya-klapan-v.html
ZH: https://tostpost.com/zh/cars/25395-how-is-lapping-the-valves.html
Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."
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