VAZ engines designation does not bend the valve. Which VAZ engines do not bend the valve? What is a "plug-in motor"

29.12.2021

The automotive industry knows thousands of engine options that are not very pleasant to operate. In particular, on such power units, when the timing belt breaks, the valves are bent, which meet the pistons in a chaotic inertial motion. The bending of the valves will have to be treated by replacing them, as well as by rebuilding the entire upper part of the engine. It will cost the owner of even an inexpensive domestic car more than 15,000 rubles. Therefore, if there is such an opportunity, it is better to choose power units in which the valves do not bend when the belt breaks. Today we will consider domestic developments in the field of engines for cars. It turns out that in this regard, the engines on domestic cars were quite adequate. Many of them did not know such a problem as bent valves for various problems.

In general, AvtoVAZ has designed quite interesting power units. Yes, most of them had less potential and consumed a lot of fuel. But in fact, it turned out that the engines did not require any maintenance at all. They just served for years without causing any problems or negative situations. In many units, even the oil was not changed, pouring 30-40 thousand cheap mineral water once, which could be obtained during the Soviet Union. So it is not worth scolding the engines of the first VAZ models, up to the VAZ 2108 and 2109. It turns out that this was the best time for the domestic auto industry, which showed the maximum potential and the minimum of problems in use.

VAZ engines from 2101 to 2106

Often, VAZ used the simplest technologies in old cars. The developments of the 70s of the last century served in fact until recently, because the latest version of 2106 was taken out of production just a few years ago. It is very interesting that there were engines throughout the entire range of these cars, which received many important advantages in operation:

power units often had 8 valves, as well as places for folding them in case of problems;
the timing belt or chain was of quite high quality, it went 50-60 thousand kilometers (or more than 200 in the case of a chain);
the engines worked in all weather conditions without problems, received a lot of positive feedback from experts;
some export cars have become popular in highly civilized countries around the world.

At the time of development of each of the VAZ cars in the range of 2101 - 2106, the transport was simply amazingly good. Even today, after 40 years from the release of some models, you can find cars in the secondary market with engines that will never bend the valve, and the power unit is not afraid of other problems. These are the features of the old VAZ developments.

VAZ 2107 engines with timing chain

Most of the VAZ 2107 power units, including all the latest engine modifications, had special timing chains, which serve quite adequately and do not fail for years. You can drive about 200-250 thousand kilometers on one circuit, then replace it simply because the motorist's conscience began to remind of maintenance.

It is important to remember that if the chain starts to give out some unpleasant sounds, it should be changed at that very moment. But even if the chain breaks, most modifications of the VAZ 2107 engine will not cause the valves to bend. Therefore, the owner of this car can be completely calm about the safety of the engine of his car.

VAZ 2108 and VAZ 2109 - a whole era in Russian cars

Hatchbacks, which were popularly called "Chisels", gained fame as reliable and durable cars, they were produced until our time, they were assembled in Ukraine for several years, but have completely lost the relevance of their appearance and technology. Today you can buy on the secondary market an excellent version of the "Nine" of a completely fresh year of release in perfect condition. The engine in this car has the following features:

there were in the history of the model a power unit for 1.1, 1.3 and 1.5 liters with a carburetor, as well as a 1.5-liter injection unit;
all engines were protected from the influence of the timing belt rupture, the valves in the power unit did not bend;
the car had quite adequate engine reliability - this unit was the last one to break in the car;
all competitors presented at one time were scattered with advanced design, excellent comfort and other benefits.

At the very beginning of their production, VAZ 2109 and 2108 cars were a real revolution in the domestic automotive industry. Buyers of such cars have become real lucky people in the eyes of acquaintances and friends, exactly the same as buyers of the latest Mercedes models today. And there were certain logical reasons for this, such as the incredible reliability of the main nodes.

VAZ 2110 - "Tenth" family and new problems

"Dozens" in the VAZ model line appeared a long time ago, but they gained popularity in 1998. Ten years later, they were taken out of production, giving way to novelties of domestic development. Today "Ten" is considered to be quite adequate transport with certain problems in assembly. On these models, the engines were installed different and they had different characteristics:

The 1.5-liter 8-valve simple powertrain did not bent the valve, but showed only 72 horses of power;
a modified 1.5-liter engine with 16 valves began to actively bend these same valves;
a more modern 1.6-liter power unit in an 8-valve version of the valve should have spared, but it did not;
you will also not wait for a cheap repair after a timing belt break on the most powerful 1.6-liter 16-valve engine VAZ 2110.

The entire family of "Tenth" models was quite high quality and reliable, but the further the plant tried to keep up with the power, modernity and relevance, the more trouble the car got. The most durable and high-quality engine was 1.5 with 8 valves and 72 horses, but the latest models with powerful 16-valve units received only problems, judging by the reviews of car owners.

The modern era of VAZ engines - the main problems

For Lada Kalina, the lineup of power units was slightly modified. This car became the first in the family of a new generation of VAZ, received all engines that bend the valves when the timing belt breaks. Lada Granta also received three types of power units that actively bend the valve. All budget VAZ power units in a modern version of the valve are bent. Priora and Largus offer the following types of engines:

the base Priora engine is a 98-horsepower power unit, the only one that spares the valves in the modern VAZ model line;
the second power unit has the same design, but 106 horses, and these extra 8 horses will cause the valves to bend;
1.6-liter 8-valve engine of French origin on the Largus does not bend the valve;
but his twin brother with 16 valves actively bends them when the timing belt breaks and mercilessly turns the upper part of the unit.

These are the contradictory and unusual characteristics in modern cars of the VAZ concern. But do not forget about one more important company representatives. The Lada 4x4 car offers a good 1.7-liter power unit with 8 valves, which has protection against kinking of these same valves. The unit, though not too powerful, is quite reliable. We offer you to watch a small overview of VAZ engines with recommendations for their operation:

Summing up

VAZ cars can hardly claim the title of optimal and best solutions even in their price range. But today, Granta or Kalina are often the only possible purchase for a Russian family. The sharp increase in prices for other new cars is responding to the need to buy specifically domestic developments. It should be noted that AvtoVAZ is carrying out colossal work on updating its equipment, but even such work has not yet yielded the desired results.

In modern VAZ lines there is only one own engine that does not bend the valve. This is a 98-horsepower unit on the Priora. However, everything here is arranged in such a way that you may not be lucky, so 16 valves will have to be changed after the belt breaks. In other engines, valves and other parts will have to be changed unambiguously after a belt break. It is much cheaper to monitor the condition of the roller and belts by replacing all these parts in a timely manner.

Every time before buying a car, we think about its engine size, how many "horses" under the hood, what fuel consumption, we compare the car by color, interior trim, as well as various elements of the exterior. Of course, these questions are important, but no less important is such a parameter as the drive of the gas distribution mechanism, in short, the timing belt.

Reference!

The timing belt is an engine element that acts as a link between the crankshaft and camshaft on any modern car.

Renault Logan engine options

Consider this option that you are going to purchase, the popular Renault Logan people's car. The designers of the Renault concern equipped the cars (except for the top-end configuration) with two types of engines that have passed all kinds of technical tests and have the indices K7J, K7M, which speaks of 1.4 and 1.6 liter 8V engines (valves), respectively. A car of the "LUX" class has a 1.6-liter engine with a 16-valve "head" with the K4M index. In each of them, a belt protrudes in the form of a timing mechanism drive. And about which engine to choose in the material:

Now we will consider each engine separately and figure out in which of them, when the timing belt breaks, the valves will bend.

K7J - 1.4-liter 8-valve engine (valve bends)

The most popular engine among the domestic consumer of the valve is oppression

The four-stroke four-cylinder gasoline engine K7J, evolved in our time straight from the 80s of the XX century. Due to the fact that the engine is a continuation of the line of engines of the previous generation, it has a distinct feature in the form of an outdated design with increased fuel consumption. However, this does not prevent it from remaining one of the most maintainable engines in the lineup.

This engine does not have hydraulic lifters, so every 15-25 thousand kilometers it needs a valve adjustment procedure. And periodically there are oil leaks at the crankshaft oil seal.

Bent 3 valves out of 4

Some "loganovodov" this engine prefer its more powerful version K7M.

K7M - 1.6-liter 8-valve engine (valve bends)

Less popular 1.6-liter 8-valve engine - K7M

The K7M engine from Renault is structurally no different from its predecessor K7J. , the same liquid cooling and combined lubrication system. The same problem with oil leakage and lack of hydraulic lifters remained - we adjust the valves.

Bent valve

However, if you look at the technical characteristics, then this engine has a 10.5 mm increased piston stroke (due to the fact that the block height is changed), as well as the largest engine displacement and flywheel.

Nevertheless, all of the above advantages did not help in any way to save the engine valves, if the timing belt breaks, they are oppressed.

K4M - 1.6-liter 16-valve engine (valve bends)

The valve on the K4M engine is bent

A distinctive feature of this "top" engine from the previous ones is two lightweight camshafts in the cylinder head and a new piston system. From this, the power in comparison with the K7M has increased by 20 hp, while the economy and stability in operation have increased. On the K4M engine, there is no problem with adjusting the valves after a certain mileage interval, since the aforementioned hydraulic lifters are already present there.

The timing drive is still carried out using a belt and, in the same way as on previous engines, when it breaks, it bends the valve.

Causes!

The timing belt can break for various reasons.

From the foregoing, we realized that on all types of Renault Logan car engines, when the timing belt breaks, the valves are bent. And below we will describe the reasons why cliffs occur at all and how to avoid this.

Timing belt wear (low quality or technical wear), oil ingress, etc.
Various foreign bodies get under the belt
Pump jams
The tension roller (s) jammed or released
Seizes the crankshaft or camshaft

In order not to worry about the condition of the timing belt, you must constantly monitor its external condition, the degree of tension, replace it according to the regulations or change immediately if it has any damage. Make sure that oil and other liquids do not get on the belt (this is the beginning of premature wear).

It was once a piston and part of an engine

If, when the timing belt breaks, only the valves are bent, we can say that this is great luck. In some situations, with such a breakdown, the pistons themselves and the surfaces of the cylinders may suffer.

Symptoms and behavior of the car in which it is necessary to replace the timing belt

As a result of increased loads or wear of the connecting rod-piston group, the timing belt can jump one turn, as a result of which,. This phenomenon is a symptom to check the condition of the belt and the correct installation.

Repair cost

Specifically, in each situation, depending on the state of the engine, after stopping it due to a break in the timing drive, auto mechanics will calculate the cost of repairs strictly individually.

Considering the usual example of a broken belt in a K7J engine, the average cost of repair (with materials) will be approximately 10-15 thousand rubles.

Greetings to you friends on the do-it-yourself auto repair site. Experienced motorists know that a broken timing belt can lead to dire consequences. In particular, there is a great risk of "meeting" the valves that have already come out of the seats and the pistons rising by inertia.

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

There are so-called non-interference engines in which valves and pistons will not collide and where belt breaks will not have more consequences than a new distribution setting. The drive belt belts have two sides. The inner one is jagged and is the one that drags the elements that need to sync perfectly. The outer surface is smooth, and tension rollers are supported on this surface, which cause the belt to be exposed, and other elements, such as a water pump, that do not need absolute synchronization.

A bit of history

On the new "tens" 8-valve engines with volumes of 1.5 and 1.6 liters were immediately installed. The first power units (from the point of view of the problem we are describing) were ideal, and the valves did not bend. Although on earlier models of the type eight, nines with a volume of 1.3 this problem was. The reason was that the piston constructively could not "meet" the valves.

The timing belt is an optional preventive maintenance item, although changes to it will be prolonged over time and will be one of the most expensive maintenance operations on a vehicle. Respect for time is important to avoid belt breakage that deteriorates over time.

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

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

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 power of the car to 92 "horses", and on the other hand, a break in the 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 peripheral elements. Thus, 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 deterioration of the camshafts in the future. In the case of countershaft shafts, it is also necessary to change the drive belts and the required bearings.

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

Updated car engine

A similar oversight was adopted and more advanced 1.6-liter 16-valve engines were installed on the new VAZ 2112 cars. Structurally, the power units did not differ much, but one feature was still present. In the new engine, the pistons had certain notches, so the problem described above was eliminated.

Bypassing these elements could mean that someone has posterior defects, which would imply reimbursement of the cost of all labor, which is the most expensive thing in replacing a timing belt. Dismantling and assembly of the toothed belt is a complex task and should preferably be carried out by specialized personnel. This requires some know-how and related tools. Incorrect steps can lead to breakdowns and breakdowns that easily reach all four digits.

Mechanical valve problems begin to occur when the engine is exposed to overheating, lack of lubrication, or kinking. Bent valves not only damage pistons, but also valve guides, camshafts and camshaft components. If your engine's drive belt breaks while driving, serious damage to the internal engine can occur. This is especially true if your vehicle is equipped with a jamming engine. Noisy motors have tight tolerances between valves and piston caps.

Over the next few years, motorists began to forget about bent valves and got used to the reliability of the new 16-valve motors. But the updated Priora model with a 1.6-liter power unit was unpleasantly surprised - the valves also bent when the timing was broken.

At the same time, the final repair was much more expensive. On the other hand, the developers made the belt as wide as possible to minimize the chance of belt breakage. Only those motorists who got a defective belt or those who did not watch their "iron horse" were unlucky.

Overspeed in the engine

After the toothed belt is damaged, the engine continues to rotate long enough for the pistons and valves to touch. Damage can include bent valves, broken pistons, and damaged engine heads. Depending on the engine equipped with your car, the maximum RPM that can safely run on your engine. When the maximum RPM is exceeded even for a short time, engine damage can 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 in motion. So monitoring the status of this node is mandatory.

On which VAZ engines the valve bends, and on which not

Let's draw intermediate conclusions, as well as highlight the most "dangerous" and "safe" models from the point of view of the likely deformation of the valves in case of damage to the belt:

When the engine accelerates excessively, the valves can "stretch" and come into contact with the pistons. When overspeed, the engine is unable to maintain a suitable timing and allows the valves to come into contact with the top of the pistons and severely damage the piston and valves to bend.

Problems such as lack of lubrication and engine overheating can also cause the valves to bend. If you continue to operate the engine while it overheats, the internal tolerances of the engine are reduced to the point that the valves can stick to the directional valves, 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 as it hits the pistons. On motors with overload valves, lack of lubrication and overheating can cause the elevators to stick, resulting in two bent valves and bent tappets.

1. What kind of engine valve bend? This category includes motors of cars of the following model range - 21127, 21116, 2112, 1194.

2. What kind of VAZ engine does not bend the valve? Motors of such VAZ models as 1183, 21114, 21083, 21124, 21126 (bent until 2013, and now not), 21128 are more reliable.

The current problem has caused a lot of controversy among motorists. Many owners of "problem" VAZs are interested in what to do so that the valve does not bend. In fact, there are several recommendations.

When rebuilding the engine, care must be taken to maintain proper clearance between the pistons and valves to ensure that the valve reliefs on the piston caps are correctly aligned with the intake and exhaust valves.Be careful when milling the heads to keep the valve in the direction of the piston. Check valve lift specification prior to exhaust valve assembly. If any of these specifications are incorrect, you could cause valve flex when the engine is rebuilt first.

Find out that a modern car has multiple hoses that can stick or clog and even get terrible pressure when you open the tank cap. A carbureted car used to need one hose to feed the engine, but nowadays the engine requires at least two, and any defect in them could cause your car to fail, stop, or even consume more fuel without saying the greatest opportunity. 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 the admission of 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 the surface of engine oil, excessive stretching, peeling of the edges - all this is a reason to install a new timing belt and not wait for a rupture.

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

The main hose is the fuel pressure, which picks up the fuel under pressure to the groove that feeds the injectors to the injectors, but pay attention to the filter that remains on this line and its maintenance, because if it gets clogged, the fuel will not reach pressure and the correct flow into the nozzles. In addition, it is important to assess the general condition of the pressure hose for possible folds or wrinkles that impede the flow of fuel, but we cannot fail to point out possible leaks that often occur even inside the tank, since there is a small hose This directs the fuel collected electrically pump, onto the cap, and very often cracks or leaks are found in the clamps, which ultimately create a pressure loss in the system.

But here, of course, one cannot do without consulting specialists. After that, you may need to flash and remove the catalyst.

If you got a car where the valve bends, then do not despair ahead of time. The ideal solution would be maximum attention to the engine and more frequent timing belt replacement... Even that will be enough to keep the risks to a minimum.

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

The return hose is responsible for unnecessary starting fuel that is discharged from the throttle, but be careful as this regulator also has a screen that can get dirty and this can interfere with proper fuel flow and create a defect in the system. Fuel feedback has been used in the past to increase fuel pressure in informal methods that allowed a gasoline engine to run on alcohol, and it's always worth checking if there is an external component in the return hose that was used for this function, or even if For whatever reason the hose is not bent or obstructed.

As for the replacement of units and expensive repairs, these costs, as a rule, do not justify themselves. Good luck on the road and, of course, no breakdowns.

Often in the conversations of motorists, phrases flash: "I got to be repaired, the belt broke, the valve was 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 inside the system, but unfortunately, the pump bowl or reservoir is not well handled by some unsuspecting professionals who can break or give a damn about its correct assembly. which can allow no 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 seal of the fuel pump assembly, especially after replacing the pump fill, due to common practice not to replace the pump liner which can leak when the tank is full or even the constant smell of fuel that is exhaled by the pump seal. Fuel couplings on the pump cover are also frequently misused when moving and are always rated.

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

The principle of operation of the valve-piston system

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

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

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

The valve bends in the event of a collision of the valve with the piston

In very rare cases, the piston crown has recesses in the piston crown to avoid collisions. From the above, 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 disadvantages of fuel lines, it is interesting that you talk to your mechanic in reviews to evaluate these important components. Existence brought us there at that 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 worked on earthquakes with other laboratory machines. We were there for two days, but he stayed there after we left. In general, on the phone made later, we realized that we had been working on it for almost a week.

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

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

Belt
Chain
Gear

Consider their common malfunctions, which can lead to bending of the valves.

Timing drive device

Consequences of a broken timing belt

Some curious motorists are interested in the question: is it possible to bend the valve with a starter? The answer is easy! Just do not set the sprockets or gears "according to the marks" - and the key is off! If the engine starts, you will immediately learn to recognize the symptoms of kinked valves. Although, if you do not "miss" much, then everything can be fixed by assembling the timing drive according to the rules.
If only one valve is bent, the engine will run unevenly. Even if it's a V-shaped "six" - hear it.
If, after the restoration of the camshaft drive, the engine runs smoothly and develops the same power, then you are in luck and the manufacturer has prudently supplied pistons with sufficient indentations in the bottoms. But, unfortunately, this is not always possible. First of all, when designing a motor, the designer achieves a combination of many seemingly contradictory qualities of his "brainchild". Let's say such as economy and power. This can to some extent serve as an excuse for the fact that on 16-valve motors, the valve often bends when the timing belt breaks.

Such problems are especially acute for the creators of diesel engines, in which the compression and the necessary swirling of the fuel mixture set the power characteristics. Therefore, the combustion chamber is made in the piston crown and often has a whimsical shape.

However, behind this is the accurate calculation and simulation 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 the most efficient combustion of the fuel mixture. The piston comes very close to the block head. Therefore, it is not yet known for certain whether there are diesel engines on which "the valve does not bend". Although, perhaps, the human genius coped with this disaster.

Repair

Curved auto engine valves

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

If you straighten the valve "by eye", then you risk making yourself more trouble. The hand-rebuilt valve is unlikely to be aligned with the guide bushing and will press firmly against the seat. And if you want to "slightly" trim the rod, then 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 carefully as possible. After all, a blow can damage the guide bushings, valve seats. There are cases when the connecting rods were bent. Breakage of rocker arms is also not uncommon.

Models of VAZ engines, the valves of which are not "afraid" of breaking the timing belt:

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

It is known that the 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 in his favorite car bent at least one valve, even once, such a person already begins to understand that even "glands" do not have iron patience and will try to become a good master of their "horse".

In conclusion, it will not be superfluous to add - watch your car, do not hesitate if there is a reason to “look under the hood”.

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

See how difficult it is to change valves on a Ten. All steps in one video

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

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). The piston article number is 2110-1004015.

Two deep grooves ensure that any of the valves, intake or exhaust, can not "meet" the surface of the piston, even if the timing belt breaks.

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

And the following is provided:

Intake valve lift - 9.4 mm;
The lift of the exhaust valve is 8.95 mm.

We quote the values taking into account the thermal gap. Whoever exceeds them will get the result.

Are 16-valve engines bent?

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

In pistons 2112-1004015, the grooves are indeed made. The probability of kinking is reduced, but it is not reduced to zero. Therefore, always pay attention to the rollers and 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 no valve meets the piston.

Items:

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

Make no mistake when choosing.

Motors 21124 are in short supply!

One of the most beloved engines on a 12-ke is 124. It does not bend the valve, it rides well, but what else is needed?

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

Used motors that bend their valves are no longer needed by anyone. It cannot jam, the belt will break and the owner "got" on the capital. Draw conclusions.

Tuning example video: 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 redesign the design of modern diesel and gasoline engines. The changes also affected the device of the piston group and the combustion chamber. These modifications were made for the most 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 was the engine with two valves per cylinder (1 inlet and 1 exhaust valve), today there is an increase in the number of valves per cylinder. Such changes are well illustrated by the most common version of the automobile with four cylinders. Previously, such motors 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.

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Broken timing belt / chain: main causes

If we compare modern motors with their predecessors, today motors have more power and less resource. As for the problem of bending the valves, it is precisely to achieve greater recoil from the motor that the distance from to is minimal. Even a slightly open valve bends during the lift of the piston at TDC. It turns out that various technical innovations in engine building did not in any way affect the well-known problem that is inherent in the vast majority of engines, regardless of the type of engine and manufacturer. We are talking about the bend of the valves when the drive belt breaks or.

An important rule during the operation of the car is to monitor the condition of the timing belt and its timely replacement. The belt must be free of delamination, cracks or other defects. Also, it is not allowed to get various technical liquids on its surface. The appearance of a squeak, squeak 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 when you need to change the timing belt, you need to study the operating instructions for a particular car. Often, on new cars, the belt changes 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 choose non-original belts with care and change every 40 thousand km.

Now a few words about the chain drive. The timing chain requires less attention, since the replacement of the chain is, on average, 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 the chain damper. Increased noise during engine operation, the appearance of a metallic clang and other signs will indicate the need for an immediate check of these elements.

So, back to the less reliable belt in comparison with the chain. The timing belt most often breaks for the following reasons:

belt wear as a result of prolonged use or the use of a poor quality product;
jamming (water pump);
wedging of the crankshaft, camshaft;
malfunction of the tension roller, jamming of the timing rollers;
destruction of the timing belt as a result of engine oil getting on its surface;
mechanical damage after contact with sharp edges, camshaft gears;

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

Despite the improvements, the general traditional principle of operation of the timing and valve train of the engine remains unchanged. As you know, raising the piston at TDC (top dead center) means that at the specified moment the valves are also 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 piston rising up. When the timing belt breaks, the camshafts stop immediately. This immediate stop occurs for two reasons:

since the driving 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. turns the crankshaft anyway. In other words, if the timing belt is cut off, then the gas distribution mechanism stops immediately and the valves remain open, while the crankshaft continues to rotate and the moving pistons hit the open valves at this time.

The result of a broken belt is that the piston meets the valves, after which the valves are immediately bent. The valve stem is often bent, although sometimes various deformations of the valve disc are also possible. Less commonly, damage to the piston itself can be found, which is also a consequence of a belt break and bending of the valves.

Engineers and automakers are familiar with this problem. To prevent the consequences of breaking the timing belt / chain in some old ICEs, special grooves for the valve were made 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 a break in the drive, the valve did not bend.

Modern engines also have distinctive piston notches. It should be noted that these grooves avoid the risk of damaging the valve while the engine is running. If the timing belt breaks on such motors, these grooves do not save from bending the valves, that is, the valve still bends even if there are special grooves on the piston.

On which engines the valve bends: how to find out

Due to the severity of this problem and the high cost of subsequent repairs, many motorists are concerned about the question of how to find out if the valve motor is bending or not bending when the timing belt breaks. To more accurately find out and determine whether the valves bend on a particular engine, you can use the following recommendations:

Study in detail the technical documentation for the engine from the manufacturer. We add that a visual inspection, as well as various data from the tables, still do not give 100% confidence that when the drive belt breaks, the valve does not bend. It is also not recommended to blindly trust the statements on specialized auto forums or rely on information from other more or less authoritative sources. In other words, the validity of any data must be questioned and rechecked.
Another method is the so-called "physical" check, which allows you to find out yourself if the valves are bent. This method allows you to determine the likelihood of valve bending, that is, to confirm or deny the possibility of contact between the valve and the piston.

In order to find out whether the valve is bending or not bending, you will need to remove the timing belt. Further, 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 in the process of cranking the camshaft, then it is necessary to make a similar check by alternately raising the pistons in all other ICE cylinders to TDC. If the camshaft does not rest anywhere, then there is a high probability that the valve on this engine will not bend when the belt breaks.

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

often the valve does not bend on simple 8-valve motors;
usually valves bend on 16-valve and 20-valve engines;
valve oppression on almost all diesel engines;
bending of the valves occurs on most engines in the event of a break in the timing chain, 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;