Greetings gentlemen! If you consider yourself a real driver, repair skills should be of an exceptionally high level, well, a maximum of average. A seasoned car enthusiast is equivalent in nothing to a punctured wheel or an engine repair. Of course, even an experienced one does not always dare to climb into the engine, but at least how the screws are tightened on the cylinder head (cylinder head) - he should know!

In this procedure, the key to success is the tightening torque of the cylinder head bolts, which must be correct! Agree, everything related to engine repair is basically a topic that is difficult to explain, but I will still try. Today, using examples of different power units, I will try to explain all the nuances in an accessible language: effort, bolt tightening procedure, etc.

The main signals for action

It is extremely important to establish the need for a tightening in time! If oil seeps between the head and the block, this could mean several "diagnoses":

1. The cylinder head gasket is worn out - This is mainly due to periodic overheating of the engine.
2. Deformed cylinder head.
3. Incorrectly tightened screws - it all depends on the qualifications of the repairman.
4. The bolts just loosened a little - their ordinary lifting will help, but only correctly performed.

Today these are modern cars (from 2010) do not need such a procedure, earlier in the days of the USSR, everything was completely different, and the cars were different!

Just think: then the process of broaching the cylinder head was an obligatory point of the debut maintenance in our state.

From all this, we can conclude that the most susceptible to the weakening of the bolts of the head of the machine of the old generation, that is, the classic and this applies not only to "Zhiguli"!

So, if you are the happy owner of a Moskvich, UAZ, Volga or ordinary VAZ, go for it!

If you are lucky and only need to tighten the bolts, you need to know correct order twisting them. Otherwise, the metal will be unnecessarily stressed, which means that distortions that devalue the whole procedure cannot be avoided. On classic engines, as well as 402 and 406 models, tightening is carried out in 2 approaches:

• Reception No. 1 - screws from 1 to 10 are tightened with a torque of 3.5-4.1 kgf.m.
• Reception number 2 - the same elements give in to the force with a torque of 10.5-11.5 kgf.m.
• Tighten the bolt 11 last with a torque of 3.5-4.0 kgf.m.

In the photo, you can see a clearer sequence of tightening the motor with 8 valves, which must be repeated.

The procedure for tightening the bolts VAZ 2108-09 Samara

Here everything is practically the same, we start from the middle, but instead of two, we perform 4 approaches:

• Approach # 1 - all bolts in sequence, as in the picture, are tightened to a torque of 2.0 kgf.m.
• Approach # 2 - the tightening force of the cylinder head bolts is equal to a torque in the range of 7.5-8.5 kgf.m.
• Approach # 3 - turn the bolts 90 degrees.
• Approach # 4 - we repeat the previous point.

I draw your attention to the fact that before starting such a procedure, it is advisable to clean power unit, I have already told in one of the previous publications. You can also find technology there, so there shouldn't be any problems.

Owners of 16-valve priors, as well as VAZ 2114 and VAZ 2112 with a similar power plant, you need to perform almost the same steps:

• Stage №1 - broaching along the sequence indicated in the photo with a moment of 2.0 kgs.m.
• Step # 2 - re-tighten the bolts 90 degrees.
• Step # 3 - Rotate the bolt 90 degrees again.

Please note: re-use of old bolts on such motors is allowed, but only those whose length does not exceed 95 mm. Bolt measurements are carried out in conjunction with the washer.

Main tool

Of course, the whole operation cannot be performed with an ordinary wrench, or rather, it can be done, but only with a socket wrench. However, the tightening torque cannot be set. Therefore, be sure to obtain a torque wrench before proceeding. Its price ranges from 600 to 3000 rubles - you can buy it once!

It's not difficult to use it:

• Set the holder to zero position (the reading of the device should be equal to the initial position of the holder.
• Controlling the readings of the key, we begin to twist the holderif the numbers do not change, the bolts are stretched, which is the norm. When the readings went uphill, it meant insufficient stretching. In this case, only after stabilization is the adjustment carried out.

Of course, do not forget - to get down to work without the original manual for a specific car, whether it be a Priora or any other car, is extremely undesirable, but if suddenly it was not at hand, I provided you with the minimum of necessary data. Long life for your car and peace of mind for its owner! And let's get any model as soon as possible and there will be no problems !!! Subscribe to my blog, stay tuned, there are many more informative and interesting things ahead, see you in the next article!

The cylinder head is the most important part in a car engine. It is located on top of the cylinder block and plays a large role in the engine of the car. The cylinder head is melted from an aluminum alloy, the attachment to the cylinder block is strong due to special mounting bolts.

Perform direct repair of this part thoroughly, if you do not follow the tightening rules, you can break the tightness of the connection between the cylinder head and the block. Some car owners independently perform cylinder head repair, neglecting the rules, due to which the tightness of the connection is lost, oil leaks, the gasket breaks through, and sometimes even the compression in the engine decreases. Do not neglect the rules and requirements when installing the cylinder head.

It is also worth remembering that excessive tightening force in some cases causes deformation of the cylinder head housing itself. When tightening the cylinder head bolts, observe the tightening torque of the wheel bolts, follow the tightening pattern and technology.

When to tighten the cylinder head

Many modern cars no longer require cylinder head bolts to be tightened, but older models domestic auto industry need a timely tightening, especially before a technical inspection of your car.

If you open the hood of a car and see that moisture has accumulated in the places of the cylinder head bolts, an urgent tightening of the bolts is necessary. Leaking grease can cause moisture to build up in these areas.

The broken block structure leads to the relaxation of the bolts. Most often, the violation of the structure occurs due to engine overheating, which also needs to be dealt with.

Cylinder head leaks are a common cause of incorrect bolt tightening. The tightening torque of the bolts is recommended to be made after the vehicle has traveled a certain mileage.

After the renovation worksconnected to the engine and the engine cylinder, the cylinder head bolts must be tightened.

Previously, the cylinder head bolts were tightened directly on the first technical inspection cars, new cars are less and less exposed to this manipulation.

Tightening torque for cylinder head bolts

Depends on the version of your car, on older domestic cars There are only two of them, on more modern versions there are already 4. Having decided to self-tighten the cylinder head bolts, prepare a warm enough room, or if you are going to make repairs in the warm season, choose a day with weather conditions when the temperature reaches more than 20 degrees Celsius. If you carry out repairs in the cold season, prepare a heated room in which it will be convenient to work.

During repair work, do not forget to clean all bolts, connections from dirt, excess oil, especially if a gasket has leaked in the structure. After each tightening manipulation, it is advisable to wait 20 minutes for the metal to return to its original shape in order to avoid overheating and deformation of the metal case.

It is advisable to see the tightening torque on the cylinder head of your car in the original manual of your car, or ask an experienced mechanic competent in these matters. Be sure to drown your car's model and year so you don't go wrong.

Observe the correct order of tightening the cylinder head bolts, otherwise the work will have to be redone, your efforts will be in vain.

How to properly tighten the cylinder head

First, find the original manual for your vehicle. Even if you bought a car hand-held, you can find a manual on the Internet. Carefully study everything you need when tightening the cylinder head, namely:

• what bolts you need to tighten the cylinder head;
• what tightening force a separate moment requires (each one needs a different force);
• the order of tightening the cylinder head.

AT modern cars special spring bolts are used that do not require additional tightening, pay attention to this. Such parts, with effort and an attempt to tighten them, can not only deform, but also damage the parts located nearby. Be careful to find out which bolts are on your car.

During repair work, put a special gasket that does not shrink the bolt, this will eliminate the need to pull the bolts.

For self-tightening of the moments, you will definitely need a special key, the movements of which will have to be done with an accuracy of millimeters, which the manufacturer indicates in the instructions for the car. Forget the thought that the tighter you tighten the bolt, the better it will hold, and so on, in this case you will have to follow the instructions clearly, otherwise you risk damaging the car engine, which will lead to more expensive repairs.

Working with a torque wrench

At the beginning of installation, set the torque wrench to the position called zero by mechanics. This position is the moment when the key readings are equal to the initial bolt position. Look carefully at the numbers at the time of the beginning of the fastener, remember, or better write down.

With slow and careful movements, start turning the key and carefully monitor the indicators, if the moment remains in the same place, then the fasteners have succumbed to stretching. If the moment changes sharply, then you need to achieve the movement of the bolt. A sharp increase in torque indicates that the holder is not fully stretched. Then the installation will have to be done after stabilization.

If, when tightening, the torque begins to decrease sharply - the fasteners are deformed, replacement is inevitable.

Driving on country roads immediately after the track has a detrimental effect on engines domestic cars... When driving, the engine of the car constantly heats up and cools down, which has a bad effect on high-quality fastening. Bolts become loose, causing breakage, oil leakage. Sudden temperature changes negatively affect the correct fastening of the bolts. Responsibly replace this small but important car part.

Here is a table of the torques not to be exceeded when tightening.

How to control the tightening torque

There are special methods for controlling the correct tightening of the bolts so as not to overdo it and not tighten them enough. Apply a torque to the bolt that is equal to the bolt breakaway moment, namely at the beginning of the turn, control the bolt breakaway moment. When the torque does not increase, you are doing everything correctly, the bolt has begun to stretch.

When you apply the wrong moment, the bolt stretching may not work, therefore, you should clearly follow the instructions, which says which moments should be applied to which bolts. These requirements are due to the operation of the cylinder block, each of the cylinders operates in a constant heating and cooling mode.

In conclusion, I would like to wish those who decide to independently repair the cylinder head, patience and good luck in this difficult matter. Remember all the nuances of the procedure, do not neglect the important rules for repairing your own car.

The tightening torque of the VAZ 2112 cylinder head (16 valves) is very important, since deformation occurs with an uneven installation of the head. This leads to the fact that after disassembly, it will be necessary to grind at least 2 mm from the surface of the block head. If you observe all the tightening torques, then you will not have to sharpen the head, and if you need to do this, then no more than a quarter of a millimeter.

Head design

So that the hydraulic pushers work in normal mode, oil is supplied to them from the lubrication system. It is supplied through special channels in the engine block and cylinder head. The oil passes through these channels and to lubricate the necks on camshafts... There is a valve in the channel, with which the oil is not drained from the top after the engine is turned off. This allows the system to operate normally until it stops completely.

Camshafts

When repairing the head, it is imperative to check the condition of the camshafts. When assembling, follow the instructions and maintain the tightening torque of the VAZ-2112 cylinder head (16 valves). Such a motor is installed on the Priora - it is quite powerful, has excellent characteristics and does not require frequent maintenance. Two camshafts drive intake and exhaust valves.

The camshafts rotate in special sockets that are located in the head itself. The difference between the camshafts is that there is a small belt on the intake. It is located near the very first support. To prevent axial movement, there are thrust collars - they are located on both sides of the support in front. There are self-tightening seals on both camshafts in front.

How to repair

1. A device for compressing valve springs. You can use both "store" and homemade. The main thing is to make it convenient to work.
2. Device for pressing out valve stem seals.
3. Tube-shaped mandrel for cap installation.
4. 10 keys, hex keys, tweezers and screwdrivers.

Perform the following manipulations:

1. Carry out all the steps to remove the head and camshafts.
2. Remove all valves using a special device.
3. Remove the valve stem seals.
4. Replace and lapping valves. It is necessary to change the valves if there is damage - burnouts, violation of geometry. Be sure to sign on which sockets you rub the valve - otherwise the tightness will be broken.
5. Collect all valve drive mechanisms - hydraulic pushers, springs, fix them with crackers.

All assembly steps are carried out in the reverse order, only one feature must be taken into account: adhere to the recommended tightening torque for the VAZ-2112 cylinder head (16 valves). The photo shows the tightening sequence.

How to tighten the cylinder head bolts

Be sure to tighten the tightening according to the scheme given in the article. In order to tighten the bolts, you need to follow a few simple steps:

1. Install a new head gasket, place it on the centering sleeves.
2. Install the head and screw on the bolts of its fastening.
3. Start tightening with a torque of 20 N * m. If the scale is in "kgf / m", then divide by 10.
4. In the second run, you need to turn all the bolts 90 degrees according to the scheme.
5. For the third run, they turn another 90 degrees.

Do not use bolts with a length of 95 mm or more. In general, the procedure is quite simple, but a torque wrench is required - without it, it will not work to withstand the correct tightening torque of the VAZ-2112 cylinder head (16 valves).

Pay attention to a rather serious and very significant moment in the field of servicing the mechanism of the machine as a whole and its units separately. If there is confidence in the serviceability of fragments, connections, engine units, then there is no way to feel on the road in a state of complete protection from various situations.

Not only your own life, but even the level of safety of many other people who had to be on the road at the same time as you, is a guarantee of the quality of car setup. The cylinder head in this case can be called the main part in the engine.

Cylinder head broaching

Both a professional car mechanic and a driver who has quite a few hundred kilometers behind him will be able to carry out a simple broaching of the cylinder head. This requires a little skill, a set of locksmith tools, patience and a desire to service your car with your own hands.

What determines the need to broach:

• First of all, the need for a technical inspection specified by the legislation.
• The second very important reason for motorists is the appearance of moisture, which accumulates in the area of \u200b\u200bthe fastening of the head and cylinder block. This phenomenon is characteristic of oil leaks.
• When the engine overheats, the head may warp significantly, which also requires repair.
• Abnormal bolt tightening or need to replace gaskets.

Significant convenience is another innovation in the modern automotive industry. Today's versions of automotive engines do not require broaching. Nevertheless, on our roads there are still a lot of old VAZs, Muscovites, UAZs, which cannot do without such a service condition and such an important technical procedure.

Therefore, for the owners of these respected models, you need to know some points of the broach and its features.

Broach order

In this video, you will be shown the cylinder head tightening diagram. Recommended for viewing!

Mastering all the details of this technology is required solely for your vehicle to be safe and reliable on the road. This order of operations must be observed solely in order to accurately dock the actual head and the cylinder block itself.

In order to avoid the appearance of various distortions, excessive stress of metal fragments, broaching should be performed according to the following rules.

We stabilize the bolts using two points:

1. The first approach is to tighten bolts 1 - 10 by means of a torque of 3.5 - 4.1 kgf * m.
2. Experts consider the second call to work with the same bolts, but with tightening by means of a torque of 10.5 - 11.5 kgf * m.
3. The last, third moment is the tightening of bolt 11, with a torque of 3.5 - 4.0 kgf * m.

Carrying out these simple manipulations with a locksmith tool will allow your car to be a reliable companion on the road. When tightening the head in the VAZ 2108 - 09, Samara model, the order and sequence of tightening corresponds to the classical methods, only in four passes.

All stages are completely similar, except for turning the bolts twice to 90 0.

Basic principles

Outwardly, this procedure is quite simple, but when performing it, you need to know the following. After tightening, you need to conduct a control examination. This requires a torque wrench. The milestone is as follows.

If, after a sufficiently strong application of force, the bolt begins to stretch, then all mechanical moments are conducted in exact accordance with the technological regime.

1. When a torque of 20 kgGcm has been applied to the bolt, and fluidity has not been achieved, the bolt should be replaced, it is made of high strength metal.
2. When a significant reduction in the bolt appears, you should think about its complete replacement, since it is completely destroyed.
3. Other nuances of this technological procedure are described only in the instructions for a specific brand of machine.

In this situation, close attention should be paid to the level and condition of all bolts, especially if this is already a serious enough and long-operated mechanism. State standards categorically prohibit the repair and use of used, old connecting structures.

In this case, you can always be let down by the spring bolts, that is, those that already require replacement. Considering the possibilities self repair car, you should be sure to follow the basic principles of operation, which suggests guidance material.

Only thanks to the advice of a professional motorist or the advice received on the manufacturer's website, you can always pull the cylinder head of your own iron assistant.

The main thing that is required on the road is comfort and a state of confidence in your favorite car and your own strengths.

Hello again :) However, I am often asked, “do I need a second cylinder head broach? ”. There are many who believe that they put the head on, tightened it and do not touch it anymore.

In the process of my rather long work as a minder, and this is already more than a quarter of a century, I was convinced from my own experience that if you are too lazy to stretch the head through the time set for pulling it, then after a while, and this largely depends on the driving style driver and distance traveled at once, you have to shoot.

Usually the gasket burns out within a year, and if a person travels a long distance, then after a month. Therefore, my advice is this: you cannot go far with the head not extended, otherwise you will have to take it off on the road. But you know, I noticed that if the equipment came directly from the factory, then after the mileage set for broaching, the heads rarely weaken. It is possible that the material of the gasket that is put there is different.

So how long does it take to pull the cylinder head? On average, after a thousand km. mileage. This is written in the instructions and this is confirmed by practice. In the instructions for so. it is also written that after ten thousand it is necessary to stretch again or check the broaching of the head.

Well, in most cases, one broach was enough. But rarely, of course, but there were cases that when the gasket burned out, the head was weak even after one broach. In my opinion it all depends on the material cylinder head gaskets, Which shrinks strongly, and which does not sag at all.

The physics of this phenomenon, namely the weakening of the head broach, is obvious. Usually, the cylinder heads are aluminum, and the bolts or studs are still steel. When heated, the coefficient of expansion of aluminum is greater than that of steel, and when the engine heats up, the head expands and squeezes the gasket like a press, and when it cools down, it also releases the gasket, and the bolts are esessno loosened.

There is a rule: you cannot pull a hot engine, only a cold one. I will tell you a list of engines that you need to stretch from my experience with which I dealt, namely: zmz405,406,409. engines Zmz-402, UAZ 417.421. Engines zmz 511,512,523, zil-130, Ural.

I will not say about others, but usually VAZ heads rarely sink. I can’t say anything about foreign cars either, because I didn’t go through a lot of them, but I don’t want to f *** in vain. That's all for now.

So what is our conclusion? But to what! stretch out the heads in time!Otherwise the gaskets will burn to hujam!

There is more to come. In order not to suffer with the repeated broaching of the head, you have to disassemble almost half of the engine in order to make sure that it has not weakened, but otherwise it happens. Depends on the gasket material. You can't guess right away.

In order not to re-stretch the heads, you can put a metal package. You can read about that. And although I wrote about the UAZ-patriot, this may apply to many engines. Good luck friends!