Head broach. Tightening GBC: Detailed description and important nuances

19.11.2019

Cars VAZ of the family of 2112 were produced with. These engines have the cylinder head with inlets. Other differences, in theory, no. And therefore will be the same if we talk about any 16-valve internal combustion engine. The tightening is performed in three receptions, although there are another option in repair books (it is for 8 valves).

The item with the title of the GBC is attached to the cylinder block with 10 screws. They are turned away by the proton key "on 10". Presented on the first photo.

Disposal sequence (1-10)

Standard Screw Length - 93 mm. If the screw was pulled out at least up to 95 mm, it is replaced by a new one (AvtoVAZ requirement).

When installed, another scheme is used (photo 2). Each screw is lubricated machine oilOtherwise, efforts will be reduced "No."

The order of tightening the head is indicated on this photo

Tightening Tightening Bolts Cup Cover

For VAZ-2112 Tightening Tightening GBC Normated:

The first passage is an effort of 20 N * m;
Each screw is crucified by 90 degrees to the right;
Waiting for 20 minutes, then the screws are finished 90 degrees.

First, the effort is very small. But at "Step 3" to cope with the work will be difficult. Use the lever.

Why do you need guide bushings

Before mounting, the CFC performs actions: clean the threaded holes, as well as all holes for the sleeve (photo 1). , and only then.

Everything is ready to install a GBC

Metal parts adjacent to the laying must be degreased. We looked at the tightening scheme, but the GBC itself should be installed correctly:

We place the GBC on the cylinder block;
Shifting the item in different directions, we achieve the bushings in the recess.

After "Step 2", the screws can be wrapped.

Sealant

No sealing compounds when installing laying are not used! Solidol, Dziatim and other lubricants are not needed. The main thing is the metal must be deguted. BUT .

Cover CBC and tightening her bolts

The metal cover, installed on the GBC, should not pass the air. At the points of contact with other details, tightness should be maintained too. Therefore, the sealant is applied to the edge of the lid. An example is shown in the photo.

Cover CBC before installation

Here you need to apply the materials: Lokatet-574, Anacrol, etc. Screws on the lid spin the "8" key.

Unscrew the screws in any order. Their quantity is 15 or 14. When installing, it is better to observe the sequence shown here below.

Cover tightening order marked with numbers and arrows

Replacing the screws are usually not required - the load is too small. We wish you success.

Typical misconceptions

If the bolts are elongated strongly, they are wrapped in four receptions. At "Step 2", the tightening torque will be 70-85 N * m. All this is common misconceptions that are not applicable to the 16-valve engine.

All the steps in one video: Replacing the gasket GBC

The head of the cylinder block (GBC) is one of the most important nodes. car Engine. From how it is installed and adjusted, the operation of the motor, its stability, reliability and efficiency depends on.

In our article we will tell how quickly and without special spending to independently install the head of the cylinder block on the VAZ family cars.

The first condition is correct and reliable installation GBC is cleanliness landing. Carefully clean the plane of the block on which the GBC is placed. Cleaning is first carried out by a sharp object, and then with special car cleaning agents that will help remove the residues of antimony, oil.

Pay special attention to the holes in which the studs are screwed. They fall into them, water, garbage. And then, when the GBC is attracted by stiletto to the block, they can make microcracks in the cylinder block due to the fact that when screwing the studs, excessive pressure is formed. When the motor is heated through these microcracks, produce gases, gases are trying to lay the gasket between the GBC and the block, and the water from the cooling system will go to the oil. Overhaul engine repair you are provided! And this is at best. Therefore, it is recommended to thoroughly check the holes before screwing the studs and be sure to get into it, taking a clean rag and using a screwdriver to get to the bottom.

When the location for the cylinder head is cleaned, proceed to the installation. Installation of GBC begins with proper Installation Gaskets, which is located between the GBC and the cylinder block.

The block holes must clearly coincide with the laying holes, only in this case its installation is considered correct.

And the head of the cylinder block should be well cleaned from nagar, dirt, oil, toosol. If there are suspicions that the GBC was overheated or other exposure, which led to deformation, then it is checked on a special device and then, if necessary, polished.

When installing the GBC, it happens that the gasket "moves", so follow it.

The GBC is considered to be established in place when she "stood up" on the guides, and the hoses, wires do not interfere. After that, start the screwing procedure. In order not to confuse the bolts, they need to be labeled in advance. The inner bolts are smeared by oil, so they are difficult to confuse with outdoor, it will be a kind of tag.

If you do not have a pneumatic or power tool, you can fasten the GBC bolts to the old, kind knocker.

The bolts are only intimidated by the bolts, but do not finally be delayed, there is a special, dynamometric key. Only with it will control the correct tightening moment, which is recommended by the manufacturer.

The second moment of the tightening should not exceed 8 kg. The order of the tightening remains unchanged, from the center to the edges, in pairs. After the bolts are tightened by 8 kg, we carry out two trust, both 90 °. First we pass the bolts for the first time, turning the dynamometer key 90 °, then the second time.

After the final tightening, the head of the cylinder block is considered mechanically installed, but not yet working. So that it turns out to be a worker, it is necessary to connect all the "perfyri", i.e. Hoses, nozzles, and so on. It is recommended immediately to return to it to it, connect the temperature sensor wire and set the timing tag.

After proceeding with the installation of valve glasses. Before installing, they are necessarily cleaned from dirt and lubricated. Clean and blurred glasses should easily become in place.

In order not to confuse the sequence of planting glasses, removing them, they are positioned in a certain order. After installing the glasses, be sure to smear the "bed" to which the camshaft will then fall.

Something useful for you:

The lubricated and pure camshaft is placed in place. You can fix it immediately with the gland. Experienced locksmiths in order to simplify the process of setting camshaft marks, sometimes the Dedovsky method is still used. During the installation of the camshaft, the first and third camshaft neck should look at you.

Then we set the camshaft cover. Lubricate the places where the camshaft will lie (bed), and do not forget about one nuance. At the ends, you need to remove the old sealant, and put a new one, then it will be well kept oil.

By setting the second part of the cover, repeat the process. Now I'm caught in nuts, and do not forget about the washers that should be under each nut.

The tightening torque of the camshaft caps should not exceed three kilograms. Experienced repairmen over time can produce tightening process without a dynamometer key. Then the tin protective cover is placed.

Then we put the gear camshaft, but before that make sure that you have not forgotten to put on the camshaft, which holds the gear from scrolling.

Bolt firmly fix the gear in its place. Be sure to make sure that the labels on the gear and CFC coincide.

Then we throw the timing belt, but it is recommended to put a tension roller. Install a special washer in front of the roller. You should not forget that the video is not worth tightening to the "madness", it should be bludging freely on the rod.

When dressing the timing belt, do not forget to check the coincidence of labels on the camshaft gear and on crankshaft shaft. When the timing belt is dressed, by twisting tensioner roller We achieve the desired belt stretch.

After tensioning to the desired indicator (the belt turns around its axis by 90 °), we tighten the smoothly control nut.

The next tribler, which needs to be properly installed in the grooves. It is necessary that after installing a traver in the grooves, the alignment of shafts was observed. Between the rubber and the GBC we mount the fuel pump, without forgetting to lubricate it with a sealant. So that the rod does not run into camshaft, it needs to squeeze a screwdriver. The housing of the gas station drive hexagon is dragged.

By pressing the housing with a slightly hexagon, I am intimidating the nuts and attract evenly. Then we already tighten the "seriously" hexagon. We establish a finally a rubber, which we have just tried out. Do not forget about sealant, which will exclude the leakage of the oil. Do not forget about the bar on which there is a ignition timing, because after starting the motor, it is possible to need to adjust the traver. We once again check the connection of wires and pipes, which forgot, connect.

The last touch is the installation of the valve cover and the timing belt casing. After the end of all works and checks, do not forget to fasten the cable throttle valve. GBC installed and ready to work.

Video: Installation of GBC VAZ. Step-by-step instruction

Pay attention to a rather serious and very significant moment of importance from the maintenance of the machine mechanism in the whole and its nodes separately. If confidence in the health of fragments, connections, engine nodes, then there is no possibility to feel on the road in a state of complete protection against different situations.

Not only your own life, but even the level of security status of many other people who had to be on the road at one time with you, is the key to the quality of the car adjustment. The head of the cylinder block in this case may be referred to as the main part in the engine.

Cylinder head broach

The professional car mechanic and the driver, who, behind the shoulders, quite a bit hundred kilometers, will be able to implement an easy-to-carry GBC. To do this, you need some skills, a set of plumbing tools, patience and desire to serve your own car with your own hands.

What determines the need to produce a broach:

First of all, the need for the legislation the need for technical inspection.
The second very important occasion of motorists consider the appearance of moisture, which accumulates in the fastener of the head and the cylinder block. Such a phenomenon is characteristic of oil leakage.
When overheating the engine, the head can significantly breed, which also requires repair.
Non-standard tightening bolts or need to replace gaskets.

Significant convenience can be called another innovation of the modern industry of the automotive industry. Today's version car motors Do not require a broach. Nevertheless, there are still a lot of old vases on our roads, Muscovites, UAZ, which without such a service condition and so important technical procedure They will not be able to do without.

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

Order of broach

In this video, you will be shown, the tightening scheme of the GBC. Recommended for viewing!

Mastering all the details of this technology requires exclusively to ensure that your car is on the road reliable and safe. Such an order of operations must be observed exclusively in order to accurately cut the head itself and the cylinder block directly.

In order to avoid the appearance of various distortions, excessive voltage of metal fragments should be broken down by the following rules.

We produce stabilization of bolts through two moments:

The first approach is to tighten the bolts 1 - 10 by means of the moment 3.5 - 4.1 kgf * m.
Specialists consider working with the same bolts, but with a tightening by means of 10.5 - 11.5 kgf * m.
The last one is the third moment - tightening the bolt 11, the moment of 3.5 - 4.0 kgf * m.

Conducting these simple manipulations with a plumbing 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 the tightening corresponds to the classic techniques, only in four right.

All stages are completely similar, with the exception of the bolts of twice to the level of 90 0.

Basic principles

Outwardly, this procedure is quite simple, but when it needs to be aware of the following. After the tightening you need to conduct a control examination. This requires a dynamometric key. The checkpoint is as follows.

If, after a sufficiently strong application, the bolt began to stretch, it means that all mechanical moments were carried out in accurately according to the technological mode.

When an application of the moment of magnitude in 20 kgsm took place to the bolt, and the fluidity was not achieved, the bolt should be replaced, it from the metal of increased strength.
When a significant reduction in the bolt appears, you should think about its complete replacement, as it is completely destroyed.
Other nuances of this technological procedure are described only in guidance materials to a specific machine brand.

In this situation, the most close attention should be paid to the level and condition of all bolts, especially if it is already quite serious and long exploited mechanism. Government standards categorically prohibit the repair and use of used, old connecting structures.

In this case, you can always bring the spring bolts, that is, those that already require replacement. Considering the opportunity independent repair Car should be guided by the basic principles of operation, which implies instructive material.

Only thanks to the advice of a professional motorist or consultation received on the manufacturer's website, you can always spend a stretcher of the GBC of your own iron assistant.

The main thing is that it is required on the road is the comfort and state of confidence in your beloved car and our own forces.

To do this, it is allowed to use only a dynamometric key - it allows you to accurately monitor the tension moment itself. After the instrument mentioned earlier, its holder must be installed at a mark - 0 (zero). Due to this, the initial position will be defined as a reference point.

Starting tightening the bolts, you need to follow the indicators from the very beginning. If the change has not happened, it means that it is most likely, the fasteners succumbed to stretching, which in general corresponds to the norm. Here you should not fear any problems. However, with a sharp increase in the moment it will be necessary to stabilize the stretching of the holder.

Tightening scheme

First of all, it is important to remember that it is necessary to pre-twist the bolts in this order:

the first two are installed on top and bottom to the central holes;
the third and fourth below, respectively, to the right and left of the average;
the fifth and sixth above also on both sides of the central;
seventh and eighth go to extreme left holes;
the ninth and tenths in the right.

the first stage - twisting is performed before the indicator of 2 kgf * m;
in the second round, the tight is carried out according to the above algorithm, with the difference only because the effort is made up to 8 kgf * m;
on the third pass, all the bolts turn clearly 90 degrees;
the fourth stage fully corresponds to the previous one, and is the final.

Afterword

Before giving a node again, it is necessary to check, in what condition all the bolts are. With the slightest inconsistency, it will be necessary to replace. It is important to understand that otherwise good result It turns out unattainable.

Also, do not postpone the replacement of the gasket, since subsequently such a minor problem will be wrapped with the need to repair all power installation. In severe cases, the entire engine is required. We also offer view video tutorial:

Tightening the head of the cylinder block is an important and responsible procedure. This operation is produced during the reverse engine assembly after removal. The correct tightening of the cylinder block bolts affects the health and performance of the power unit, as the head is part of the combustion chamber. In other words, after tightening, the GBC is a single integer with the cylinder block. A sealing gasket is additionally installed between the block and the block head. In the event that the head is prolonged incorrectly, the likelihood of damage to the GBC itself, the bolt of the block head and holes under the bolts in the bolt.

In some cases, leaks appear in the installation site. Also, in case of a loose fit of the block of the block, during operation, a breakthrough of exhaust gases can occur into channels and the engine, and the antifreeze in the oil is traveled to the oil and vice versa. As a result of the property lubricant And the coolant changes change, which can quickly output the engine. Next, we will talk about what the procedure for tightening the GBC bolts must be observed how the cylinder head bolts are tightened with a dynamometric key, as well as what should be the power of the head.

Read in this article

Cylinder head tightening on diesel and gasoline motor

No matter what type of engine is installed on a particular car (or), the head of the cylinder block of modern cars has a similar device. This element of the engine consists of a housing in which the mechanism of gas distribution is installed ( distributional shafts, intake and exhaust valves). Another feature of the GBC is that a part of the combustion chamber is made in the head. In the head housing, special channels are also performed, which circulates engine oil and working fluid cooling systems.

Proper adhesion of the head to the cylinder block provides tightness of the combustion chamber, cooling and lubrication channels, resulting in force aggregate gives maximum power and torque, provides better fuel efficiency and other essential performance features. In the event that the GBC is tightened incorrectly, cracks may appear in the head housing. The fact is that the GBC is made of aluminum alloys, while the head bolts are steel.

Taking into account the fact that engines internal combustion Significantly heated during operation, DVS parts are experiencing temperature expansion. As for the GBC, the aluminum head and steel bolts are expanding differently. It turns out if the head is prolonged incorrectly, then uneven voltage occurs in its case. For this reason, it is extremely necessary to observe the moment of tightening the bolts of the head of the cylinder block, as well as the sequence of the fastening bolts.

How to tighten the head of the cylinder block correctly

Let's start with the fact that for tightening the GBC you need to have a torque wrench. You should also prepare suitable heads for the key for the key and have a little clean motor oil. Before tightening the head fastening bolts, it is necessary to study the repair and operation of a specific TC. This recommendation is especially important, since the tightening force of the bolts on different motors is different. Some engines have a cylinder block, which is made of cast iron, while the other DVS get lightweight blocks from aluminum alloys.

Moreover, even on different motors of one manufacturer with an aluminum head and a cast-iron block, the degree of tightening of the head will differ anyway. Also in the manual will also be indicated by the order of tightening bolts of fastening. Turning to the process of covering the GBC, it should be remembered that each action is performed consistently. The main goal is to pull the tightening uniformly. The following are the basic recommendations.

During the installation of the head and further tightening, it does not matter whether you put the assembled part or mount one housing.
At the initial stage, you need to lubricate the fastening bolts with engine oil. To do this, you need to apply a small amount of lubricant on the bolt thread.
Then the bolts are inserted into the holes that are made in the head housing and the cylinder block, after which they are tightened by hand.
Next, the dynamometric key should stretch the bolts in a specific sequence and with the torque indicated in the manual. Usually the tightening is carried out in several approaches. First, the bolts are tightened with a little effort, after which it is additionally stretched another or twice.
Also remember, it is especially important to observe not only the effort, but also the order of tightening bolts. For example, during the installation of the GBC, the tightening of the fastening bolts is made from the center to the edges of the head. This approach allows to reduce the risk of damage to the head of the block and gaskets between the BC and CCC.
It is worth adding that after a run of about 1000 km on some cars the bolts must be additionally covered. It depends on certain constructive features of one or another If, when tightening, the so-called spring fastening bolts were used, then the attachment after installing the GBC is not required.

Common mistakes when tightening head

Note that the errors allowed during the installation of the cylinder head can cause damage to the head itself and the cylinder block. Also, after the start of operation of the OI, it is possible that serious malfunctions are possible, which are able to quickly output the engine. In some cases, the power unit may suffer so much that it will require overhaul Or replacing such a motor on a contract engine. In the list of different errors that lead to undesirable consequences, it is worth separately allocated: a bolt with a bolt to enter the mounting bolts, work with unsuitable or worn out nozzles to a dynamometer key, violation of the bolt line, the use of bolts that are not suitable for size.

Quite often, the hole under the fastening bolt in the cylinder block turns out to be scored mud, rust, etc. Attempts to clean the hole do not always give a positive result. As a result, tighten the bolts with due force can be very difficult. For this reason, the threads of the bolts are lubricated with oil. It is prohibited to pour oil into the hole itself to improve the lubricant. Such actions can lead to what a thread well collapses after twisting the bolt. In such a situation, the block of cylinders will need to be repaired or even change.

Also, an attempt to tighten the GBC without using a dynamometer key can also lead to problems. In this case, the tightening torque is often exceeded. The consequences can be the most different, but often the head mounting bolts break, after which there is a need to repeatedly disassemble the engine to remove fragments and repair of the cylinder block.

Tightening bolts GBC usually have a head under the hexagon, less often performed in the form of a square. If the nozzle turns out to be worn out, then during the tightening there is a risk of turning. As a result, the edges of the bolt head are "lick". In such a situation, the damaged fastener is difficult to spin or unscrew to replace. As for the selection of bolts, it is necessary to additionally take into account some features. In many repair manuals, you can find information that the bolts are allowed to be reused. As practice shows, optimally change the fastening elements on new after each removal of the GBC.

The fact is that after a tightening, the bolt becomes a little longer, that is, pulls out. For this reason, you should pay attention to the maximum allowable length of the bolt, which should be spelled out in the instruction manual. If there are no new bolts, then before installing, it is necessary to measure the available fasteners. In the case when the bolt turns out to be slightly longer compared to the maximum permissible indicator, then it focuses into the bottom of the hole in the cylinder block. The result becomes or breakage of the bolt, or the split of the block of cylinders itself.

Violation of the recommended repair manual concrete Engine The order of tightening of the fastening bolts causes excessive overvoltage in the cylinder head housing. Aluminum alloys, which are the material manufacturing material, are not adapted to such loads. The result becomes the appearance of cracks in the housing of the head. Through the cracks of a small size, gases leak occur, that is, the tightness of the combustion chamber is disturbed. The engine in this case loses power, is observed increased flow Fuel. If the cracks affect the channels of the lubricant or cooling system, then oil or antifreeze can fall into the combustion chamber, as well as external leaks.

Finally, we add that it is not excluded and the input of working fluids from one system to another (for example, Tosol enters oil channels). The malfunctions of this kind are quite serious, since violations of the normal operation of the lubricant or cooling system lead to the overheating of the engine, accelerated wear driving parts, engine jamming, etc.