Which VAZ engines do not bend valves? Bent valves on the engine: why and what to do about it Which engines bend valves

Welcome, friends, to the DIY auto repair website. Experienced car enthusiasts know that a broken timing belt can lead to dire consequences. In particular, there is a high risk of “meeting” valves that have already come out of their seats and pistons rising by inertia.

The result is deformation of vital engine elements, as well as an urgent need to visit a service station and carry out major repairs. But does the valve always bend when the timing belt breaks? Should we be afraid of this?

There are so-called non-interfering engines, in which valves and pistons will not collide and where a belt break will have no more effect than a new timing setting. Belts drive belt have two sides. The inner gear is the one that drags the elements that need to be perfectly synchronized. The outer surface is smooth, and on this surface are supported the tension rollers that force the belt, and other elements, such as the water pump, that do not need absolute synchronicity.

A little history

The new “tens” were immediately equipped with 8-valve engines with volumes of 1.5 and 1.6 liters. The first power units (from the perspective of the problem we are describing) were ideal, and the valves did not bend. Although earlier models like eight and nine with a volume of 1.3 had this problem. The reason was that the piston structurally could not “meet” the valves.

The timing belt is an optional preventative maintenance item, although changes will take longer over time and will be one of the most expensive vehicle maintenance items. Respect for time is important to avoid belt failure, which deteriorates over time.

There are a number of conditions that make it advisable to pay more attention to the condition of timing belts and, if necessary, change them at an early stage. For example, those who make a lot of short trips and in the city should take special care, as should those who live in extreme climates, or park a car on the street or move in very dusty, rainy or dirty environments.

Over time, a more modern VAZ 2112 model appeared in the “ten” family, equipped with a one and a half liter engine with a 16-valve engine. It was from this moment that the problems began. Many car enthusiasts and specialists could not understand why the valve bends.

In fact, the reason was in the design of the power unit. On the one hand, the appearance of a 16-valve head made it possible to increase the car’s power to 92 “horses,” and on the other, a broken timing belt invariably led to a collision of pistons and valves, as well as deformation of the latter.

When replacing a belt, it is important not to waste or replace all the peripheral components. So we have to change all the tensioners and the water pump if it is driven by a belt. It is also recommended to replace the camshaft and crankshaft seals to avoid possible leakage due to deteriorating camshafts in the future. In the case of countershaft shafts, the drive belts and the necessary bearings also need to be replaced.

After that, I had to go to a service station and have the car undergo expensive repairs. The design fault lay with the pistons themselves, which lacked the necessary recess. As a result, the timing belt break always ended in the same way.

Updated car engine

A similar oversight was taken into account and more advanced 16-valve 1.6-liter engines were installed on new VAZ 2112 cars. Structurally, the power units were not very different, but one feature was still present. In the new engine, the pistons had certain recesses, so the problem described above was eliminated.

Bypassing these items could mean that someone has defects post hoc, which would imply reimbursement for all the labor, which is the most expensive part of replacing a timing belt. Removing and assembling a timing belt is a complex task and should preferably be carried out by specialized personnel. This requires some know-how and the appropriate tools. Failure to follow the steps correctly can result in breakdowns and breakdowns that can easily reach all four digits.

Mechanical valve problems begin to occur when the engine is subject to overheating, lack of lubrication, or over-torque. Bent valves not only damage pistons, but also valve guides, camshafts, and camshaft components. If your engine's drive belt breaks while driving, severe damage to the internal engine can occur. This is especially true if your vehicle is equipped with an interference engine. Interference motors have tight tolerances between valves and piston caps.

Over the next few years, car enthusiasts began to forget about bent valves and became accustomed to the reliability of the new 16-valve engines. But the updated Priora model with a 1.6-liter power unit was an unpleasant surprise - the valves also bent when the timing belt broke.

At the same time, the final repairs were much more expensive. On the other hand, the developers made the belt as wide as possible to minimize the likelihood of the belt breaking. The only unlucky ones were those car enthusiasts who received a defective belt or those who did not take care of their “iron horse” at all.

Engine overspeed

Once the timing belt is damaged, the engine continues to rotate long enough for the pistons and valves to touch. Damage may include bent valves, broken pistons and damaged engine heads. Depending on the engine your vehicle is equipped with, there is a maximum RPM that your engine can safely run. When the maximum RPM is exceeded even for a short time, engine damage may occur, including bent valves.

Unfortunately, even on the new 1.4-liter Kalina engines with 16 valves, repairs cannot be avoided if the belt breaks while driving. So monitoring the state of this node is mandatory.

On which VAZ engines does the valve bend, and on which ones does not?

Let’s draw intermediate conclusions and also highlight the most “dangerous” and “safe” models from the perspective of probable valve deformation in the event of belt damage:

When the engine accelerates excessively, the valves can "stretch" and come into contact with the pistons. When overspeeded, the engine cannot maintain proper timing and allows the valves to contact the top of the pistons and cause severe damage to the piston and valves to flex.

Problems such as lack of lubrication and engine overheating can also cause bent valves. If you continue to run the engine while it is overheating, the engine's internal tolerances are reduced to the point that the valves can stick to the valve guides, causing the valves to contact the pistons. Likewise, when there is insufficient lubrication, it can cause the valves to stick to the guides, causing the valve to bend when it hits the pistons. In engines with overload valves, lack of lubrication and overheating can cause the lifters to stick, resulting in two bent valves and bent lifters.

1. Which VAZ engines bend valves? This category includes car engines of the following model range - 21127, 21116, 2112, 1194.

2. Which VAZ engines do not bend valves? More reliable are the engines of such VAZ models as 1183, 21114, 21083, 21124, 21126 (they bent until 2013, but now they don’t), 21128.

The current problem has caused a lot of controversy among car enthusiasts. Many owners of “problem” VAZs are interested in what to do to prevent the valve from bending. In fact, there are several recommendations.

When rebuilding an engine, care must be taken to ensure that proper clearance is provided between the pistons and valves to ensure that the valve reliefs on the piston caps are properly aligned with the intake and exhaust valves. Be careful when milling the heads to ensure that the valve is supported in the direction of the piston. Specification for lifting the control valve before assembling the exhaust valve. If any of these specifications are incorrect, you may cause bent valves when the engine is first rebuilt.

Find out that a modern car has several hoses that can stick or clog and even a terrible pressure when opening the gas cap. Previously, a carbureted car needed one hose to feed the engine, but nowadays the engine requires at least two, and any defect in them can cause your car to fail, stall, or even consume more fuel at its best. leaks. The tank is an example of this issue as it clearly shows the existence of most hoses and their fundamental functions for good engine performance and allowing gases that were previously released into the environment.

They are as follows:

1. First, try to periodically assess the condition of the timing belt and replace it at the first sign of damage. The appearance of cracks, contact with engine oil on the surface, excessive stretching, peeling of the edges - all this is a reason to install a new timing belt and not wait for a break.

2. Secondly, if the engine is expected to be repaired, then you can change the pistons, and in some cases, the crankshaft. In addition, some experts recommend (as a solution) installing a new camshaft.

The main hose is the fuel pressure line that takes the pressurized fuel to the groove that feeds the injector jets, but pay attention to the filter that stays on that line and its maintenance because if it gets clogged, the fuel won't reach the pressure and flow correctly into the nozzles. In addition, it is important to evaluate the general condition of the pressure hose for possible folds or wrinkles that impede the flow of fuel, but we cannot help but point out possible leaks that often occur even inside the tank, since there is a small hose that directs the fuel collected by the electric pump, onto the cap, and that very often cracks or leaks are found in the clamps, which ultimately create a loss of pressure in the system.

But here, of course, you can’t do without consulting specialists. After this, flashing and removal of the catalyst may be necessary.

If you get a car with bent valves, then don’t despair ahead of time. The ideal solution would be maximum attention to the engine and more frequent timing belt replacement. Even this will be enough to minimize risks.

When there is a loss of the required pressure for the engine to operate properly, the vehicle may fail or deteriorate, fuel consumption will be high due to low pressure, since the electronic injection module will have more injectors, and at low pressure, the fuel flow will be changed and poorly controlled.

The return hose is responsible for the unnecessary engine starting fuel that is released by the throttle body, but be careful as this regulator also has a screen that can become dirty and this can prevent the fuel from flowing properly and create a defect in the system. Fuel feedback has been used in the past to increase fuel pressure in unofficial methods that allowed a gasoline engine to run on alcohol, and it is always worth checking to see if there is an external component in the return hose that was used for this function, or even if For some reason the hose is not bent or obstructed.

As for replacing components and expensive repairs, these costs, as a rule, are not justified. Good luck on the roads and of course no breakdowns.

Often the phrases flash in the conversations of car enthusiasts: “I got in for repairs, the belt broke, the valves were bent.” Of course, in such cases we are talking about the timing belt. In order to understand the causes of the “catastrophe”, let us consider in general terms the interaction of the connecting rod-piston group and the gas distribution mechanism.

The returning fuel is routed to the pump bowl or housing so there is no shortage of fuel to the last drop within the system, but unfortunately the pump bowl or reservoir is not handled very well by some unsuspecting professionals who may break or not care about its proper assembly. which can allow the lack of fuel with low levels or curves because the fuel can roll and the pump traps air instead of fuel.

The most common fuel leak occurs at the fuel pump assembly seal, especially after replacing the primer pump due to the common practice of not replacing the pump liner, which can allow a leak when the tank is filled to the maximum or even a persistent smell of fuel that is exhaled by the pump seal. Fuel couplings on the pump cover are also often abused when moved and are always evaluated.

This interaction is strictly coordinated, otherwise normal operation of the engine cannot be ensured.

Operating principle of the valve-piston system

Let's take the compression stroke as an example. When the piston, compressing the combustible mixture, approaches top dead center, it comes almost close to the combustion chamber (on diesel engines, to the surface of the head). If at this moment any of the valves are not closed, then loss of compression will be the lesser evil. Most likely, the valve, the rod of which is rigidly held by the rocker arm (or camshaft cam) from above, will take the impact of the piston.

The gases absorbed by the container will be burned by the engine, and this process is controlled by the injection module, which controls the valve that allows these gases to be absorbed by the engine. Fuel supply hoses, which direct fuel from a bottleneck into the reservoir, are victims of drying and road objects that often get thrown around the wheel and require visual inspection whenever the vehicle undergoes inspection or when the smell of fuel is detected.

A strong fuel odor can also come from the fuel cap or its bottleneck, since this cap is not indestructible, therefore timeless, since it is one of the busiest components due to reserves. The cap seal is in most cases located in the neck itself, and this neck can break or the rubber seal fails. The fuel cap still needs to be replaced, allowing fuel to evaporate through the key entry slot, and this is very common.

The valve bends in the event of a collision between the valve and the piston

In very rare cases, the manufacturer provides recesses in the piston crown to avoid collision. From what has been said, I hope it is clear why the valve bends when the timing belt breaks: the camshaft stops rotating, some of the valves remain in the open position, being a “convenient target” for pistons moving by inertia.

Now that you know the function and major drawbacks of fuel lines, it's interesting that you talk to your mechanic about reviews to evaluate these important components. Existence had brought us there at this moment, now it depended on us to look and understand. He came to the end of the laboratory visits, even those that had been reserved earlier, in the days when he was working on earthquakes with other laboratory machines. We were there for two days, but he stayed there after we left. In general, from a phone call later, we realized that we had been working on it for almost a week.

The coherence of the timing with the crank mechanism is ensured by the precise installation of gears or sprockets. To do this, installation marks are made on them and on certain points of the engine.

According to the type of torque transmission, the gas distribution mechanism drive can be:

Belt
Chained
Geared

Let's look at their common malfunctions, which can lead to bending of the valves.

Timing drive device

Consequences of a broken timing belt

Some inquisitive motorists are interested in the question: is it possible to bend the valves with a starter? The answer is easy! Just do not install sprockets or gears “at the marks” - and the key is to start! If the engine starts, you will immediately learn to recognize the symptoms bent valves. Although, if you don’t “miss” too much, then everything can be corrected by assembling the timing drive according to the rules.
If just one valve is bent, the engine will run rough. Even if it is a V-shaped “six”, you will hear it.
If, after restoring the camshaft drive, the engine runs smoothly and develops the same power, then you are lucky and the manufacturer prudently supplied pistons with sufficient recesses in the bottoms. But, unfortunately, this is not always possible. First of all, when designing a motor, the designer strives to combine many seemingly contradictory qualities of his “brainchild”. For example, such as efficiency and power. This may, to some extent, justify the fact that on 16-valve engines the valves often bend when the timing belt breaks.

Such problems are especially acute for creators diesel engines, in which compression and the necessary swirl of the fuel mixture determine the power characteristics. Therefore, the combustion chamber is located at the bottom of the piston and often has a whimsical shape.

However, behind this lies the precise calculation and modeling of vortex flows on a computer. Such chambers are called undivided and making recesses for the valves is impractical from the point of view of high-quality atomization and maximum efficient combustion of the fuel mixture. The piston is almost close to the head of the block. Therefore, it is not yet known for certain whether there are diesel engines on which “the valves do not bend.” Although, perhaps, human genius coped with this disaster.

Repair

Bent car engine valves

Never try to repair bent valves in any way!
Replacement, and only replacement!

If you straighten the valve “by eye”, you risk getting yourself into even more trouble. A valve restored by hand is unlikely to be aligned with the guide bushing and will press tightly against the seat. And if you want to straighten the rod “a little”, it will work like a pump, pumping oil into the combustion chamber - no cap will hold it.
It would be prudent to troubleshoot other parts as thoroughly as possible. After all, an impact can damage guide bushings and valve seats. There are known cases when connecting rods were bent. Breakage of rocker arms is also not uncommon.

Models of VAZ engines whose valves are not “afraid” of timing belt breakage:

VAZ 2111 1.5l; VAZ 21083 1.5l; VAZ 11183 1.6l (8 valve); VAZ 2114 1.5l and 1.6l (both 8 valve)

It is known that old 8-valve Opel engines (such as those on the DAEWOO Nexia and Chevrolet Lanos) also calmly endure this trouble.

As a rule, if a person has bent at least one valve on his favorite car, even just once, such a person already begins to understand that even “hardware” does not have iron patience and will try to become a good owner of his “horse”.

In conclusion, it would be useful to add - keep an eye on your car, do not doubt whether there is a reason to “look under the hood”.

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 brought into action 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 is guided by the operation of the car's crankshaft.

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. 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 existed domestic devices who had never known such trouble 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 camshaft and crankshaft of the car.

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 the craftsmen will check the equipment, which, of course, will be quite 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 on a 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 not a single 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

Continuous improvement of the internal combustion engine in order to increase and improve fuel efficiency forced engineers to seriously rework the design of modern diesel and gasoline engines. Changes also affected the device piston group and combustion chambers. These modifications were made to maximize the efficient filling of the cylinders and their high-quality ventilation, that is, to obtain improved gas exchange.

If in the early stages of development the most common engine was with two valves per cylinder (1 intake and 1 exhaust valve), today an increase in the number of valves per cylinder is everywhere observed. Such changes are well illustrated by the most common version of the car with four cylinders. Previously, such engines were often 8-valve, with one. Today, such a unit is often a 16-valve version with two camshafts (for intake and exhaust valves), can be equipped with a variable valve timing system, etc.

Read in this article

Broken timing belt/chain: main reasons

If we compare modern engines with their predecessors, today's engines have more power and shorter service life. Regarding the problem of valve bending, it is precisely to achieve greater efficiency from the engine that the distance from to is minimal. Even a slightly open valve bends as the piston rises to TDC. It turns out that various technical innovations in engine building did not in any way affect the well-known problem, which is inherent in the vast majority of engines, regardless of the type of motor and manufacturer. We are talking about bending of valves when the drive belt breaks or.

An important rule when operating a car is to monitor the condition of the timing belt and replace it in a timely manner. The belt should not have any delaminations, cracks or other defects. Also, various technical liquids are not allowed to come into contact with its surface. The appearance of squeaking, squeaking and other extraneous sounds will require the owner to check the tension and condition, as well as the tension and other rollers.

To answer the question of when to change the timing belt, you need to study the operating instructions for a particular car. Often on new cars the belt is changed after 60 thousand kilometers traveled or after 2-3 years (whichever comes first). A planned replacement with an original belt involves the next replacement every 50 thousand km. It is advisable to select non-original belts with caution and change them every 40 thousand km.

Now a few words about the chain drive. The timing chain requires less attention, since replacing the chain on average is necessary once every 150-200 thousand km. and more. In this case, it is necessary to monitor the chain tension, the condition of the tensioner and chain guide. Increased noise during engine operation, the appearance of a metallic clang and other signs will indicate the need to immediately check these elements.

So, let's return to the belt, which is less reliable compared to the chain. The timing belt most often breaks for the following reasons:

belt wear as a result of long-term use or use of a low-quality product;
jamming (water pump);
jamming of the crankshaft, camshaft;
malfunction tension roller, jamming of timing rollers;
destruction of the timing belt as a result of contact with its surface motor oil;
mechanical damage after contact with sharp edges, camshaft gears;

Why do valves bend when the timing belt or chain breaks?

Despite the improvements, the general traditional principle of operation of the timing belt and valve mechanism engine remains unchanged. As you know, raising the piston to TDC (top dead center) means that at the specified moment the valves are closed. This is necessary to create pressure and seal the combustion chamber.

If the timing belt breaks, then the valves simply do not have time to close, which means they collide with the rising piston. When the timing belt breaks, the camshafts immediately stop. This immediate stop occurs for two reasons:

since the drive force from the belt or chain disappears;
the camshaft cams themselves are retarded by return springs;

As for the crankshaft, this element continues to rotate by inertia. The inertial rotation of the shaft does not depend on what gear and at what speed the car was moving, at what speed the engine was running, etc. still cranks crankshaft. In other words, if the timing belt breaks, then the timing mechanism immediately stops and the valves remain open, while the crankshaft continues to rotate and the moving pistons hit the valves that are open at this time.

The result of a broken belt is that the piston meets the valves, after which the valves immediately bend. Often the valve stem is bent, although sometimes various deformations of the valve disc are also possible. Less common is damage to the piston itself, which is also a consequence of a broken belt and bent valves.

Engineers and automakers are well aware of this problem. To prevent the consequences of a broken timing belt/chain, some old internal combustion engines had special grooves for the valves on the piston. These grooves actually provided the necessary free space, which allowed the open valves not to collide with the upward moving piston. In such motors, after the valve drive broke, the valves did not bend.

Modern engines also have characteristic recesses on the piston. It is worth noting that these grooves avoid the risk of damage to the valve while the engine is running. If the timing belt breaks on such engines, the indicated grooves do not prevent the valves from bending, that is, the valves still bend even if there are special grooves on the piston.

On which engines the valves bend: how to find out

Due to the seriousness of this problem and the high cost of subsequent repairs, many car enthusiasts are concerned with the question of how to find out whether the valve on the motor bends or does not bend when the timing belt breaks. To more accurately find out and determine whether the valves are bent on a particular engine, you can use the following recommendations:

Study in detail the technical documentation for the engine from the manufacturer. Let us add that a visual inspection, as well as various data from the tables, still does not provide 100% confidence that the valves will not bend if the drive belt breaks. It is also not recommended to blindly trust statements on specialized auto forums or rely on information from other more or less authoritative sources. In other words, the reliability of any data must be questioned and double-checked.
Another way is the so-called “physical” test, which allows you to find out for yourself whether the valves are bent. This method allows you to determine the likelihood of valve bending, that is, confirm or refute the possibility of valve contact with the piston.

In order to find out whether the valve bends or does not bend, you will need to remove the timing belt. Next, the piston in the first cylinder is set to the TDC position, after which the camshaft of the gas distribution mechanism is rotated 720 degrees. If no stop is observed during the rotation of the camshaft, then it is necessary to carry out a similar check by alternately raising the pistons in all other cylinders of the internal combustion engine to TDC. If the camshaft does not rest anywhere, then there is a high probability that the this engine the valve does not bend when the belt breaks.

Regarding the various technical information, which is presented in tables, as well as referring to the experience of auto mechanics and ordinary drivers, the summary data allows us to note:

valves often do not bend on simple 8-valve engines;
valves are usually bent on 16-valve and 20-valve engines;
valves bend on almost all diesel engines;
valve bending occurs on most engines in the event of a timing chain break, that is, on engines with a timing chain drive;
valves usually bend on engines of small cars with a displacement of 1.1 to 1.4 liters;

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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. The number of 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 For everyone modern engines valve bending. Our 16-tiklops, depending on your luck, 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...