Why do valves bend in an 8 valve engine? Signs, causes and consequences of a broken timing belt

Firstly, the contingent of owners and employees of the service consisted of immigrants from the southern republics who actively help us live in central Russia. Some treat them without any suspicion, because they have a firmly established reputation as honest, friendly and hardworking people. Don't you agree???
Secondly, I can’t imagine how it’s possible to catch a tow truck on the Moscow Ring Road at 7 am on the road (without calling it by phone first).
However, for some reason many people avoid dealing with such services.
But for some reason I didn’t finish writing the continuation of the codeforfood story.
He will correct me somewhere, but from his words everything looked like this:
the next day he received a call from the service center and was informed that they had carried out diagnostics. They reported that the valves were bent and, as a result, major renovation engine (50-70 thousand).
Since we mainly service our cars from one reliable and experienced private mechanic, Uncle Kolya (who specializes in engines), he decided to pick up the car and consult with him. We, like naive people, discussed all this in his topic and didn’t understand why he didn’t do it right away or didn’t take the car to his yard.
It was expensive to call a tow truck, so he and his friends arrived in another car to tow the broken car.
Something like this picture appeared before his eyes: the engine was disassembled, removed (damn, it’s actually hard to pull it out without special equipment, and if the bridge is in the way from below, then they pull it out through the top) and lay in the trunk. For “diagnostics” they demanded 8,000 rubles (!!!). To do this, you don’t need to remove the engine or disassemble it; Uncle Kolya would diagnose this for a maximum of 500-1000 rubles. I had to pay and have the car towed to the house.
Why did you pay 9,000 rubles? For someone to simply tell you: “the valves are bent” and dismantle the engine? Why the fuck should you disassemble it and pull it out for this? It became clear to me that this was a pure scam. It may be that the valve is not bent there at all (on some types of cars this does not happen when the timing belt breaks). We'll find out soon enough.
But unexpectedly, from my friend from work I learned his story, which is like two peas in a pod similar to the story of codeforfood.
His uncle is a very experienced man in the auto repair business. His friend (by the way, an Armenian) called his uncle and said that he was being scammed at a service center in Anino and needed help. His uncle told him if he was a normal person, that he went to this service because it has a very bad reputation.
The scheme is approximately the same. He was standing on the Moscow Ring Road, a tow truck picked him up and offered to take him to a service center in Anino. They insisted that he leave the car overnight (as if we were already closing), in the morning they called him and said that something needed to be replaced - the price was 10,000 rubles. When he arrived to look at the car, the engine had already been disassembled and was lying in the trunk (damn, what kind of style is this - disassembling the engine and putting it in the trunk). He agreed. Then they called him the next day and said that they had discovered another problem. The final price will be 35,000 rubles. When he came to pick up the car, it turned out that he owed 35 thousand plus 10 thousand, and if he didn’t agree, then he had to assemble the engine, and that would also cost money. In short, the money pumping began. After that, there was a call to a friend, a support group of 5 people arrived, a difficult conversation took place, the car was returned with an apology, while trying to get out of the situation “beautifully” - something like in the movie “Boomer”, when the main characters meet and part ways with a local group.
My uncle told my friend that this service was a scam. It looks decent, but they are not engaged in repairs, but in screwing up, sabotaging and siphoning off money. There is also something like a car market, a spare parts market, etc. nearby.
The scheme is simple - their tow truck runs along the Moscow Ring Road in this area, notices cars standing on the side of the road and convinces their owners to take the car to this service. Then what I wrote above begins. I’ll find out the exact address later, exit from it through a gas station. There is quite a large service there, but it belongs to people from the same republics and the work pattern there is also the same
I googled a little “car service in Anino” and came across similar stories.
Be careful, don't let yourself get screwed. Never set foot in such places. Don't feed these devils.
reviews on the Internet
http://www.aremont.ru/services/varshavskii_tehcentr.html?allcomments
http://avtotochki.ru/poi/view/97755328853/
http://avtotochki.ru/poi-review/view/9090908883/
http://avtotochki.ru/poi-review/view/1460269326873/
http://www.superstor.ru/index.php/component/joobb/topic/167-

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For which I congratulate you, those who have a working day tomorrow are actually unlucky. ... which cars, or rather the engines of which cars, do not bend valves when they break. .... Golf 3 1.8 volume AAM they say it doesn’t bend, I haven’t checked it myself, the timing belt is on...

On what cars with what engine, when the timing belt breaks, does the valve not bend, do you just install a new one and move on? | Topic author: Raisa

Valeria  On all 16 valve engines domestic production valve bending when the timing belt breaks

Yaroslav engines that do not bend: 11113,21083,21124,11183 and a very small number of 21120Valentina
engines on which it bends: 11111,21080,21081,21120,11194,21126. With the exception of a small number of 21120Love on all these engines, the valve and piston meet when the timing belt breaks. Quantity bent valves depends on the luck of the owner. There were cases from 2 to 16.

Polina Toyota gasoline with 5 A engine

Alexey Natalya) VAZ: 8cl. 1.5l.; VAZ: 16cl. 1.6l. Nexia8kl. 1.5l. VAZ 2105. Ford Sierra.

Boris  S3 Toyota engine

Sasha  TOYOTA drive your dream)

Zoya  The valves bend on all modern engines. Our 16-tiklopovye as luck would have it, 1.5 16ve bends 100%

Arthur  In any case, I wouldn’t check... even knowing that it shouldn’t be bent.
After all, the belt will break 100% at night, on a business trip or with the family on the highway, when overtaking and as far as possible from a populated area. And the temperature will be -25..30 outside.

Artem bends everywhere on modern 16 valve engines because he wants to get maximum engine power. What's the difference between oppression and oppression? if for timing belt Keeping an eye on it won’t cause any problems, and even more so if you buy a foreign car, this topic is not relevant at all.

Dmitry 2109 1.5 engine.

Alexander  Adjust the valves and they won’t bend.

Oksana Tavria, ZAZ CHANCE with 1.3L does not oppress

On which cars does the valve not bend? - Forums about cars in Russia...

May 25, 2013 - Dear forum members, I would like to learn more about such a problem as bent valves when the timing belt breaks. What cars... [Without flooding] Do valves bend when the timing belt breaks on D17A...

Valves are an integral part of the gas distribution mechanism vehicle. It should be noted that these devices are quite important, since they ensure the release of exhaust gases and create compression during ignition and injection of fuel in the engine cylinders. Modern engines provide different options for their installations.

1. Operating principle of valves

The valves are sufficient simple device, so the principle of their operation will not be difficult even for a beginner. They are driven by the camshaft, which is located at the top of the block head. Using this device, valves open and close. The camshaft unwinds and uses special ovals to press the valve, which eventually opens. When the shaft stops pressing, the valve closes. The camshaft operates on a chain or belt drive, which guides the operation crankshaft car.

The crankshaft and camshaft undergo a mandatory synchronization stage. This is done so that the movement of the piston and the opening of the valves coincide in the same sequence: when the piston moves down, the valves open, and when the piston moves up, the valves close. Thus, pressure is created in the combustion chamber. After this, the air-fuel mixture is ignited, and the piston is directed downward under pressure. This cycle is repeated many times.

2. The reason why valves bend

It is important to note that the situation when valves bend does not depend on how many valves there are in the engine. The cause of the malfunction is quite simple: the timing chain or belt breaks. The chain itself breaks quite rarely, since in most cases it stretches, and the chain sprockets simply jump.

The camshaft will stop abruptly when a break occurs. will continue to push the pistons. Thus, those valves that burn in the combustion chamber and those pistons that go up will meet at the top point, and pistons with sufficiently high energy will break and bend the valves. Fixing this breakdown will be quite expensive, since it will be necessary to pull out all bent elements from the motor. In addition, the block head itself may be damaged, in which case it will be necessary to replace it.

3. Why the belt breaks and how to protect yourself from it

The most common reason is simply not following the belt replacement instructions from the device manufacturer. Often, when the vehicle is under warranty, the replacement will be successful, but when a car enthusiast wants to independently ensure the performance of his car, big troubles can arise if one saves on replacing this device.

The pump may also fail. Some car models provide for the device to be engaged in the belt, and when it fails, the system simply jams, as a result of which the belt wears out in a matter of hours. A poor-quality belt is also the root cause of the malfunction. That is why it is necessary to take high-quality, albeit expensive parts. The camshaft may also become unusable. If it is made of metal, you can immediately say that such an element will fail after some period of time, which, of course, is almost impossible to predict. Plus, the tension rollers of the gas distribution system may also fail. They simply fall off or jam, causing the belt to fly off or break and the valves to bend.

There is only one way to avoid this. You simply need to follow the instructions and promptly change the belt, tension rollers and other elements of this system, which manufacturers prescribe according to regulations. All parts must be purchased only from high-quality automotive stores and services that are official dealers.

4. Are there valves that cannot bend?

Such options exist in modern automotive world, but they are very rare. Previously, there were domestic devices that had never known such a disaster before. Unfortunately, there are practically none of them now. However, you can resort to solving the problem by tuning power units. The point is quite simple: Instead of conventional pistons, options with recesses on top are installed. The method is quite effective, since in the event of a break, the valves will lower into these pits, and failure will be prevented. The driver will only need to install a new belt, as well as synchronize the car’s camshaft and crankshaft.

However, this method is not always effective. The thing is that such pistons will contribute to the loss of part of the engine power internal combustion, because such a piston will be heavier than an ordinary piston, which will affect the compression force. That is why not all motorists recognize and resort to using this method.

5. How to find out if the valves on the engine are bent

Many motorists are wondering how to distinguish a bending valve from a non-bending one, or how to determine the performance of the valve. Unfortunately, there is no answer to this question, since the valves cannot be visually detected as a malfunction. Nowhere are there any references, inscriptions, or notes that would lead to the comprehended truth. Of course, you can stop by an official workshop, where specialists will check the equipment, which, of course, will be quite an expensive pleasure. It is advisable to do diagnostics of your vehicle every 20-30 thousand kilometers, where the inoperability of such elements will be determined.

VAZ cars of the 2112 family were produced with one of four engines. Two of them are 8-valve, two more are 16-valve. 8-valve engines have pistons with grooves, and therefore the valves cannot bend. But this property does not apply to any Lada passenger cars: almost all have 8-valve engines during the transition. It is known which engine The VAZ-2112 never bends the valves - the engine 21124 (1.6 16v) ​​remains the same.

Look how difficult it is to change valves on the Ten. All steps in one video

We are talking about engines 2111 and 21114. They are injection engines, and the shape of the pistons was inherited from the carburetor engine 2110.

ShPG elements (pistons) 2110-1004015

Actually, the same pistons were installed on three different 8-valve valves: 2110, 2111 (1.5 8v), 21114 (1.6 8v). Piston article number – 2110-1004015.

Two deep recesses ensure that any of the valves, intake or exhaust, cannot “meet” the piston surface even if the timing belt breaks.

The standard 8-valve valves on the VAZ-2112 do not bend the valves, no matter what some owners say. Sometimes, and if the valves fly out more than VAZ provides, then there will be no guarantee against bending. Therefore, follow the regulations.

And the following is provided:

• Intake valve lift – 9.4 mm;
• Exhaust valve lift – 8.95 mm.

We give values ​​taking into account the thermal gap. Whoever exceeds them will receive the result.

Do 16 valve engines bend?

ShPG elements (pistons) 2112-1004015 and 21124-100401504

In pistons 2112-1004015, the grooves are actually made. The likelihood of bending is reduced, but it is not reduced to zero. Therefore, always pay attention to the rollers when at 16 valve engine.

The VAZ-21124 engine is one of those 16-valve engines that do not bend their valves. The grooves are made so that no valve meets the piston.

Articles:

• 2112-1004015 – piston of the VAZ-21120 engine (1.5 16v);
• 21124-100401504 – piston of internal combustion engine VAZ-21124 (1.6 16v).

Don't make the wrong choice.

Motors 21124 are in short supply!

One of the most favorite engines in the 12 is the 124. It doesn’t bend valves, drives great, and what else do you need?

The number of VAZ-21124 engines produced over the entire period is difficult to calculate. Maybe it even exceeds the number of 20 engines. Engine 21124 had a Euro-4 version, and this engine, regardless of the version, is in short supply. Prices also remain high. Well, the less voluminous 16-valve engine is rated lower, despite the fact that it is more powerful!

Nobody needs used engines that bend their valves now. It can’t get jammed, the belt will break and the owner “got” into trouble. Draw conclusions.

Video with an example of tuning: increasing the volume from 1.5 to 1.6

Car owners encountered the problem of valve bending even on the first G8 models. The 1300cc engine installed on them bent the valves when the belt broke.

This problem is associated with several reasons, such as jamming of the pump and tension rollers, wear or poor quality of the timing belt.

When the timing belt breaks, the camshaft stops in the position in which the break occurred, and the crankshaft, continuing to rotate, pushes the pistons towards the open valves. As a result, they collide, leading to damage to the valves and pistons.

Such a collision can damage not only the pistons, but also the cylinder walls and connecting rods. In this case, car repairs will be very expensive and time-consuming.

On some types of VAZ car engines, this was avoided. In such engines, special recesses for the valves are cast on the pistons, so if the belt breaks, a collision does not occur.

Several types of engines were installed on the Lada. Let's look at which of them are dangerous and which are safe and why the valve on Kalina bends when the belt breaks.

Types of engines affected by this problem

1. Eight-valve, model 21116, volume 1.6 liters, equipped with a lightweight piston group. Due to the lightening, the pistons became very thin and there was simply no room left for the valve casting. When such pistons collide with a valve, the entire piston group usually suffers.
2. Sixteen-valve, model 21126, with a volume of 1.6 liters, is installed on the more expensive Kalina class of cars. On this engine, collision of pistons with valves is also inevitable.
3. The sixteen-valve model 11194, with a volume of 1.4 liters, is one of the most economical, but, unfortunately, is also susceptible to this problem.
4. Sixteen-valve, model 21127, volume 1.6 liters. This new engine, created on the basis of the previous model 21126. Installed recently. It is more powerful, but also remains on our “dangerous” list.

Types of engines not affected by this problem

1. Sixteen-valve, model 21124, with a volume of 1.6 liters, is considered one of the most reliable. It was installed on the twelfth model of Lada. With this engine you will not have any problems with the gas distribution mechanism.
2. Eight-valve, model 11183, 1.6-liter, proven engine, distinguished by its reliability, ease of maintenance and availability of spare parts. Also falls into the category of safe.

A few tips on how not to find out if the valves on Kalina are bent and not end up with expensive repairs

In order to try to avoid damage to the gas distribution mechanisms, it is necessary to promptly replace the timing belt.

It is not enough to change one belt. Be sure to change the tension rollers along with it and monitor the condition of the pump. If necessary, it must also be replaced.

Never skimp on spare parts. Choose your timing belt carefully. It should not have any irregularities, stripes or seams.

When purchasing a water pump and tension rollers, choose only well-known and trusted manufacturers.

By following these simple rules, you will never know whether the valves on a Kalina car are bent, and how much it costs to overhaul the engine.

I would like to hope that this article will help avoid problems, usually associated with oversight technical condition car. With the correct attitude towards the operation of the elements of the gas distribution mechanism, such problems should not arise.

Of course, for many experienced car owners, the question such as “whether the valves on a Priora are bent” has long been studied. But there are many new drivers who do not have information on this matter. It is for such car enthusiasts that this post will be written.

It is worth noting that several engine modifications were installed on Lada Priora cars. And of course, the answer to the question about bent valves will depend on what power unit is installed on your car.

On which Priora engines do the valves bend?

1. VAZ 21126 is a classic Priorov engine, which was the first on these cars. Thanks to changes in design, namely lightening connecting rod-piston group, there is no room left for the valve recesses in the pistons. As a result, when the timing belt breaks, which sometimes happens on Priora, the valves are bent, and sometimes even the pistons are damaged.
2. The VAZ 21116 engine is a simpler 8-valve engine that Priora inherited from Granta. By appearance practically no different from a conventional 8-valve injection engine, but inside there are again lightweight pistons, which leads to the already familiar consequences in the event of a timing belt break - valve bending. But it is worth noting that the load on the timing belt of 8-valve engines is slightly lower than that of 16-valve engines, and on such power units such problems are less common.
3. VAZ 21127 is an improved 126 engine that no longer develops 98, but as much as 106 hp. Of course, here, too, the valves bend when they meet the pistons, because by increasing the power, it was impossible to increase the pistons in order to make the necessary recesses. In fact, the piston remained the same, and the changes affected only the intake receiver.

On which engines does the valve not bend when the timing belt breaks?

It so happened that only one engine was available for the Priora, which did not suffer from the problem of bent valves. This is model 21114, which was mainly installed only on the “standard” package, that is, the cheapest versions. But in recent years, it is simply impossible to find a Priora with such engines, since this reliable unit was replaced by the 116th from Granta.

In general, everything leads to the fact that piston group They are constantly being lightened and refined, making engines more powerful and at the same time economical. And of course, this happens to the detriment of the reliability and reliability of the engine when the timing belt breaks. Well, to make sure that the valves on the Priora bend, you can watch a special video review below, which even shows an example with a belt that simply jumped a few teeth.

As you can see, even when the belt jumped several teeth, all of them were already bent intake valves. I think that the answer to the questions on this topic has been received and if you have anything substantive to add, you can unsubscribe below in the comments.