What can I do to avoid bending the valve. On which VAZ engines does the valve not bend? Full list

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 engines are equipped with grooved pistons, and therefore 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 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 the Ten. All steps in one video

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

ShPG elements (pistons) 2110-1004015

Actually, the same pistons were installed on three different 8-valve: 2110, 2111 (1.5 8v), 21114 (1.6 8v). The piston article is 2110-1004015.

Two deep recesses ensure that any of the valves, inlet or outlet, cannot "meet" the surface of the piston even if the timing belt breaks.

Regular 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 stronger than provided by the VAZ, then there will be no guarantee against bending. So follow the rules.

And the following is provided:

• Inlet valve lift - 9.4 mm;
• Exhaust valve lift - 8.95 mm.

We give the 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 indeed made. The probability of bending is reduced, but it is not reduced to zero. Therefore, always pay attention to and rollers when 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 designed so that no valve will meet the piston.

Articles:

• 2112-1004015 - engine piston VAZ-21120 (1.5 16v);
• 21124-100401504 - ICE piston VAZ-21124 (1.6 16v).

Make no mistake when choosing.

Motors 21124 are in short supply!

One of the most favorite engines on a 12-ke is 124. It does not bend the valve, it rides great, but what else do you need?

The number of VAZ-21124 engines produced for all 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 version, is in short supply. Prices also remain high. Well, a less voluminous 16-valve is rated lower, despite the fact that it is more powerful!

Motors with mileage that bend their valves are no longer needed by anyone. It cannot jam, the belt will break and the owner "hit" the capital. Draw your own conclusions.

Video with an example of tuning: increase in volume from 1.5 to 1.6

Once I wrote about the PRIORS engines, they asked me - "", read it very informatively. In this article, I promised to talk about the very principle why this happens on some engines, but not on others. In general, about the breakdown process itself, today I will try to put everything on the shelves, just for you “newbies”. I will not pull let's go ...

So valves are part of G azodisp R divisive m vehicle mechanism (timing). It should be noted that the part is quite important, without them there would be no exhaust gases, and compression would not be created in the cylinders during fuel injection and ignition. In modern engines, there are a different number of them from 8 to 32. But in most cases, options with are used, they are the most common of all.

Principle of operation

“Makes” them work by opening and closing the camshaft, which is located on top, in the head of the block.

It spins up and, thanks to special ovals, presses the valve - it opens, or releases it - it closes. In turn, the camshaft runs on a belt or chain drive from the crankshaft.

The camshaft and crankshaft are necessarily synchronized so that the opening of the valves and the movement of the piston coincide in a certain sequence - when the piston goes down, the valves open (“burn” into the chamber), when the piston rises, they close (go up), thus creating pressure in combustion chamber, then the candles ignite the mixture and the pressure piston goes down. This cycle is repeated many times. Here is a short video clip of work for understanding.

This is an ideally working scheme, with due maintenance(timely replacement) everything will go many thousands of kilometers.

The reason why the valve bends

I would like to note that this can be both on 8 and on 16 valve engines. The reason is simple - it's a broken timing belt or chain. In fairness, it is worth noting that the “chain” very rarely breaks, basically it stretches and the “hooking” sprockets begin to jump, which can also be the reason.

When a break occurs, the camshaft stops abruptly, but the crankshaft continues to push the pistons. Thus, the valves are lowered "burned" into the combustion chamber, the piston also goes up - which should not happen during normal operation. They meet at the “top point” and the piston, having high energy, simply bends or breaks the valves. As you can see, everything is quite banal.

Such a breakdown is very expensive - you need to “half” the motor and pull out the bent elements, sometimes even the block head itself suffers (but rarely), so it will also need to be changed. You can also find damage to the pistons (the valve breaks through it), but here it’s still more serious, you will need to remove the camshaft and pistons with “rods”.

Why the belt breaks and how to protect yourself from it

1) The most common reason is simply not following the instructions for replacing the belt from the manufacturer. As a rule, if your car is under warranty, then the replacement will be under warranty, but if you service it yourself, then many people forget or save on replacement. It "gets out" sideways.

2) Poor-quality belt, now there are just a lot of fakes, especially for our VAZs. In reality, they don’t go even 5,000 kilometers (it happened several times in a company car), so take better proven options. Or change to a service station with a guarantee.

3) The pump fails. In some car models, it is also engaged in the belt, and if it fails, then it simply wedges, it will wipe the belt in a matter of hours.

4) The camshaft itself wears out. It is made of metal and it is clear that after some time it will wear out (it can jam), although a lot of time must pass (high mileage).

5) The tension rollers of the timing system fail. They can fall off, they can jam - in any case, the belt will either break or it will fly off - there is only one end, it will bend the valves.

There is only one defense guys. Change the belt in time, as well as the tension rollers and other elements of this system, which are assigned to you according to the regulations. Take “consumables” at official or trusted station stores, because fakes go much less than originals, here you risk every thousand kilometers, in general, a belt is not a spare part that is worth saving on.

Are there options that won't bend?

Of course there is, but now they are very rare. Once again, I advise you - there are models of motors that “didn’t bend” before. However, unfortunately now there are practically none. Therefore, many spend - such tuning of power units.

The essence here is also trite, simple - they put instead of ordinary pistons. Then even if a break happens, the valves will simply sink into these holes and nothing bad will happen. It will be necessary to put a new belt and synchronize the camshaft and crankshaft.

"Healthy" - you say. BUT why then such pistons are not put on all models? After all, it is 100% protection.

Again, everything is simple - such pistons eat up part of the engine power, and decently. There is still debate about how much. Some say that by about 5 - 7%, and this, excuse me, is DECENT! The thing is that such a piston is heavier, and the compression is not as effective. That is why many have abandoned this decision. Many - but not all!

Of course, for many experienced car owners, the question of whether the valve bends on the Priore has long been studied. But there are many newcomers among drivers who do not have information about this. It is for such motorists 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 machine.

On which Priory engines does the valve bend?

1. VAZ 21126 is a classic prior engine, which was the first on these machines. Due to changes in the design, namely, the lightening of the connecting rod and piston group, there was no room left for valve recesses in the pistons. As a result, when the timing belt breaks, which sometimes happens on the Prior, the valves are bent, and sometimes even the pistons are damaged.
2. The VAZ 21116 engine is a simpler 8-valve engine that Priore got from Grants. In appearance, it is practically no different from a conventional 8-valve injector, but inside, again, lightweight pistons, which leads to already familiar consequences in the event of a timing belt break - valve bending. But it is worth noting that the load on the timing of 8-valve engines is somewhat lower than that of 16-cell engines, and on such power units such problems are less common.
3. VAZ 21127 is an improved 126 engine that develops not 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 at the same time 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 Priora, which did not suffer from a problem with valve bending. 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 Priora with such engines, since this reliable unit was replaced by the 116th from Grants.

In general, everything leads to the fact that the piston group is constantly lightened, refined, making the engines more powerful and at the same time economical. And of course, this happens to the detriment of the reliability and reliability of the motor when the timing belt breaks. Well, to make sure that the valve bends on the Priore, 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 a few teeth, all the intake valves were already bent. I think that the answer to questions on this topic has been received, and if you have something to add on the merits, you can unsubscribe below in the comments.

I welcome you friends to the DIY auto repair site. Experienced motorists know that a broken timing belt can lead to sad consequences. In particular, there is a high risk of “meeting” of valves that have already left their seats and pistons rising by inertia.

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

A bit of history

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

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 that moment that the problems began. Many motorists and specialists could not figure out 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 hand, broken timing belt invariably led to a collision of pistons and valves, as well as deformation of the latter.

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

Updated car engine

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

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

However, the final repair was much more expensive. On the other hand, the developers have made the belt as wide as possible to minimize the chance of belt breakage. Unlucky only for those motorists who got a defective belt or those who did not follow their “iron horse” at all.

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 state of this node is mandatory.

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

Let's draw intermediate conclusions, and also highlight the most "dangerous" and "safe" models from the position of probable deformation of the valves in case of damage to the belt:

1. Which VAZ engines bend valves? This category includes motors of cars 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 (bent until 2013, but now not), 21128.

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.

They are the following:

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 engine oil, excessive stretching, peeling 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 the pistons can be changed, and in some cases the crankshaft. In addition, some experts recommend (as a way out) the installation of a new camshaft.

But here, of course, one cannot do without the advice of 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 this will be enough to minimize the risks.

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

Every time before buying a car, we think about what engine size it has, how many “horses” are under the hood, what fuel consumption, we compare the car by color, interior trim, as well as various exterior elements. Of course, these issues 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 the option that you are going to purchase, loved by everyone people's car Renault Logan. The designers of the Renault concern equipped 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 indicates engines with a volume of 1.4 and 1.6 liters 8V (valves), respectively. A luxury car has a 1.6-liter engine with a 16-valve “head” with the K4M index. In each of them, a belt acts as a drive for the gas distribution mechanism. And about which engine to choose in the material:

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

K7J - 8-valve engine with a volume of 1.4 liters (valve oppression)

The most popular engine in the domestic consumer valve oppression

Four-stroke four-cylinder Gas engine K7J, has 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 clearly prominent feature in the form of an outdated design with increased fuel consumption. However, this does not prevent him from being one of the most maintainable engines in the line.

On the this engine there are no 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 out of 4 valves

Some "logans" prefer this engine to a more powerful version of the K7M.

K7M - 8-valve engine with a volume of 1.6 liters (valve oppression)

Less popular 1.6-liter 8-valve engine - K7M

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

bent valve

However, if you look at specifications, then this engine has an increased piston stroke by 10.5 mm (due to the fact that the height of the block has been changed), as well as the largest engine volume and flywheel.

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

K4M - 16-valve engine with a volume of 1.6 liters (valve oppression)

Bent valves on the K4M engine

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 increased by 20 hp compared to the K7M, while at the same time increased efficiency and stability in operation. On the K4M motor, there is no problem with adjusting the valves after a certain mileage interval, since the aforementioned hydraulic compensators 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 bend. And below we will describe the reasons why cliffs occur at all and how to avoid it.

• Timing belt wear (poor quality or technical wear), oil ingress, etc.
• The ingress of various foreign bodies under the belt
• The pump is stuck
• Idler roller(s) stuck or loose
• Stuck crankshaft or camshaft

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

It was once a piston and part of an engine

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

Symptoms and behavior of the car in which the timing belt needs to be replaced

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

Repair cost

Specifically, in each situation, depending on the condition of the engine, after it stops due to a broken 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 repair cost (with materials) will be approximately 10-15 thousand rubles.