How to change the engine head gasket on a VAZ 2112

When is it time to change?

The gasket serves to seal the connection between the head and the cylinder block. There are several types of it:

• Asbestos. The main advantage: minimal shrinkage and excellent recoverability.
• Metal. These are some of the most reliable and high-quality consumables.

  
  New metal cylinder head gasket

• Non-asbestos. Used as repair kits. Main advantages: elasticity, heat resistance, elasticity.

The procedure for replacing the cylinder head gasket on a VAZ 2112 16 valves is indicated in the manual, but this is not the main reason. There are a number of signs that determine the need for replacement:

• leakage of engine oil or antifreeze in the connection area;
• white steam present in the exhaust gases indicates that antifreeze has entered the cylinders;
• when exhaust gases enter the cooling system, foam appears at the neck of the expansion tank;
• the presence of oil stains in the coolant indicates a leak in the connection;
• the presence of a white coating on the oil dipstick indicates that there is antifreeze in the engine oil; this may be due to a damaged gasket.

Replacement intervals for the cylinder head gasket on the VAZ-2110

Repairing the cylinder head from “a” to “z”
It is very difficult to predict the exact service life of the gasket.

The most important thing that interests owners is the replacement interval for this part.

1. Manufacturer of the part.
2. The quality of the material from which the gasket is made.
3. The conditions under which these parts were stored.

Since the gasket is made of rubber, storage conditions directly affect its service life. For example, a part purchased at the market, which was stored for a long time in a damp and unheated container, will be worse than the same spare part purchased in a store.

The main function is to ensure maximum sealing of the cylinder block with the cylinder head. If you do not monitor the condition, the engine life will be significantly reduced.

Signs of a broken gasket

Foam around the expansion tank cap is one of the signs of a cylinder head gasket failure.

You can find out that the seal of the connection is broken for the following reasons:

1. White vapor appears in the exhaust gases.
2. You may notice oil stains in the antifreeze.
3. Leak in cylinder head connections.
4. There is a large amount of oil in the pan.
5. You may notice foam around the filler cap.

Although it seems that it is very difficult to notice the vapors in antifreeze, this can be done by placing a bag over the neck of the open expansion tank. If there are gases in the antifreeze, the bag will inflate.

Frequency and reasons for replacement

According to official regulations, the cylinder head gasket of a VAZ 2112 engine can last 200 thousand kilometers. Usually, after traveling such a mileage, the service life of the seal is exhausted.

For what reasons may it be necessary to replace it:

1. Natural wear and tear. Any part or machine assembly has a certain service life. Natural wear and tear cannot be avoided.
2. Damage to the cylinder head, deformation or deflection. This may cause the gasket to break and hot coolant to get onto its surface.
3. Boiling of the power unit. Regular driving of a car with an overheated engine will cause damage to the sealing element.

Signs of replacement

By what “symptoms” can you understand that it’s time to change the BC head gasket:

1. Leakage of motor fluid or coolant at the junction of the head connection with the block itself. If you see oil stains at the point of contact between the cylinder head and the cylinder head, diagnose the condition of the power unit.
2. White smoke comes out of the exhaust pipe of the car, almost steam, uncharacteristic of exhaust gases. This indicates that coolant has entered the engine cylinders.
3. The presence of foam in the area of ​​the neck of the expansion tank in the engine compartment of the car. The substance foams as a result of exhaust gases entering the cooling system through a broken seal.
4. The presence of greasy oily spots in the antifreeze, which indicates a poor connection and lack of tightness.
5. A white coating has appeared on the engine fluid level dipstick. This indicates that refrigerant has entered the lubricant. This is usually the result of a damaged gasket.

Video “Visual aid to replacing the cylinder head gasket”

User Vyacheslav Kravchenko suggests familiarizing yourself with the process of replacing the cylinder head gasket using the example of a sixteen-valve “Ten”.

Many owners prefer to repair their cars themselves, so it will be useful for them to know how to replace the cylinder head gasket on a VAZ 2110 (2112) 8 and 16 valves. This part plays an important role in the overall design of the engine. It is possible to perform such an operation yourself, but you will need to use a special torque wrench to tighten the bolts securing the head to the cylinder block. It can be easily found in most garage cooperatives.

Replacing the cylinder head gasket on a VAZ 2110 (2112) 8 and 16 valves

performed each time the head is removed from the cylinder block. This is provided for in the conditions of maintenance, operation and repair of this vehicle. The replacement procedure itself is important, but approximately the same, with rare exceptions, for all car models. Therefore, we believe that the article will be useful for many car owners.

What is she?

This part of internal combustion engines serves as a seal to the place where the cylinder head is connected to the cylinder block. The engine has another gasket that seals the valve cover with the cylinder head. These parts cannot be confused with each other; these are completely different products, their design, purpose and application are different.

This part seals three separate but interconnected engine systems at once. These are lubrication, cooling and gas distribution systems. It is because of this that very high requirements are applied to it. During the compression of the fuel mixture, high pressure is created in the combustion chamber, therefore, after each removal of the cylinder head, the gasket must be replaced.

If it is reused, it may burn out, causing the engine oil to mix with the coolant. This means that you will also have to change the engine oil with filter and antifreeze in the cooling system. Several types of such products are produced:

• Gaskets made on a non-asbestos basis
  are characterized as products that are easily restored and have minimal shrinkage;
• Products made from asbestos
  . Their high heat resistance, elasticity and elasticity are noted. They are recommended for use as repair kits;
• Metal gaskets
  . Today they are considered products that have high efficiency and quality, allowing the created pressure to be evenly distributed over the entire sealed surface.

Reason for replacing it

There can be many reasons for this, both for used cars and for new cars. In most cases, it is impossible to predict the timing of its replacement. There are certain signs by which one can judge the need for such an operation, but this often occurs suddenly.

Let's look at a few of the most common signs:

• Noticed the appearance of drops of engine oil or coolant at the sealing area of ​​the head and block;
• The presence of whitish exhaust from the exhaust pipe is evidence of the penetration of coolant due to burnout of the gasket;
• When checking the oil level on the dipstick, it was noticed that this is a sign of coolant entering the lubrication system;
• The presence of oil stains in the coolant, which can be seen in the expansion tank or radiator;
• Bubbling of the coolant is evidence of exhaust gases breaking through the burnt gasket into the engine cooling system.

Features of repairing the cylinder head of the Lada Granta

The engine of the Lada Granta car has differences with the Kalina engine. The block head, in comparison with the Kalinovskaya one, has been increased in height by 1.2 mm. This is due to a change in the combustion chamber. Lightweight pistons installed. The timing belt has been modified and operates in a temperature range from minus 40 to plus 40 degrees. The declared belt mileage is up to 200 thousand kilometers.

The main feature of Granta cylinder head repair is the use of metal-ceramic seats. By car Kalina, 2114, etc. Cast iron saddles are used, which can be processed manually using a set of domestic cutters.

Machining cermet seats requires wear-resistant cutting tools. In order to successfully process them, the head is installed on the NEWENContour-BB machine, designed specifically for the rapid processing of seats and guide valves with digital control or manually with a Neway tool.

Cleaning valve channels

To remove any valve, you will need to remove the camshaft. All screws on the bearing housing must be unscrewed evenly and tightened with a force of 10 N*m. The hydraulic compensator can be removed with a magnet, and then the valve is desiccated by compressing the spring with a puller (see photo).

How to remove the valve

There may be carbon deposits in the valve channels. It is cleared:

• Flat screwdriver;
• Sanding felt.

Grinding is carried out as follows: a rubber pipe is placed on the valve, a paste with diamond chips is applied (one drop), then the valve is pressed into the channel and scrolled. It will also be possible to change the valve stem seals (2112-1007026). You can’t do this without a special puller.

Cap puller

On any car, including the VAZ-2112, cylinder head repair comes down to cleaning and checking, as well as correcting geometry defects. In the latter case we are talking about milling. The presence of cracks and chips is a reason for replacement, not repair.

A small photo report

A burnt valve is immediately visible.

One valve burned out in cylinder 2

Carbon deposits were found in each valve channel.

Carbon layer in the cylinder head channels

Repair: cleaning all channels, replacing the valve with lapping. Direct repair of the VAZ 2112 cylinder head will require several operations that require some special equipment. Of course, this is not possible at home, and car enthusiasts simply replace worn parts. Next, we will consider the process of repairing the block head, as well as some of the nuances associated with this work.

Stages of block head repair

Before proceeding directly to the cylinder head repair process, it is worth noting that the head must be completely disassembled and all the necessary spare parts purchased. Let's consider the process of complete overhaul of the cylinder head.

Washing and crimping

The process of washing automobile spare parts with hot kerosene

In order to wash the head, it must be completely disassembled, that is, all parts that can be easily removed must be dismantled. For a complete wash you need 12 liters of hot kerosene. At car services, this is done using a sprayer that supplies liquid under pressure. This way, all the dirt and remaining metal shavings are washed away. The washing is carried out until the cylinder head is completely clean.

The process of crimping the cylinder head

Crimping is a process in which the integrity of a part is checked. Pressure testing can be carried out in two ways, which are basically similar. The first is to close all the cracks and fill the part with water. If there is water leaking or leaking somewhere, then the integrity has been compromised and repairs are necessary. The second method is to close all the cracks and immerse the head in an aqueous solution. It will be immediately obvious where the part is depressurized. If the integrity of the head is damaged, it must be restored.

Removing saddles

Before moving on to the rest of the overhaul steps, the valve seats must be removed. In the best case, they will easily be knocked out of their seat, and if not, then you will have to use Russian ingenuity.

The valve is welded to the seat and knocked out of the seat

So, what to do if the valve seats do not come out? The solution is simple. It is necessary to weld a tube to them so that the working end passes through the channel of the guide sleeve and knock it out until the seat comes off the mounting mount. Of course, cracks may form on the seat ring or a piece may break off. After completing the procedure, it is necessary to inspect the place and, if necessary, weld it with argon welding.

Stages of repair on 8 and 16 valve cars

Eliminating engine fluid leaks

Sorry, there are no surveys available at this time. Leaking motor fluid from an internal combustion engine (8 or 16 valves) is an important symptom in which the cylinder head requires repair. Typically, fluid leaks from under the plug. It is located directly on the cylinder head at the rear of the engine. Leakage is usually caused by worn o-rings.

1. In order to replace the plug, you need to unscrew three bolts from the studs.
2. Having done this, you can remove the sealing rubber from the installation site.
3. It is better not to use domestically produced sealing gaskets, since their quality leaves much to be desired. In order to protect yourself from having to replace the ring again, it is better to use a sealant. For greater convenience, the sealant can be filled into a medical syringe.
4. Squeeze some sealant into the place where the plug will be installed. Wait five minutes before installing the new gasket in place and then installing the plug.

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Replacing the unit

If this happens and you have to carry out not a repair, but a replacement of the cylinder head 2110 8 valves, and you do not have the skills to carry out such repair work, then our instructions will be useful to you:

1. Open the hood of the car and disconnect the negative terminal of the battery.
2. Place a container under the bottom of the car to collect used consumables. Locate the refrigerant drain plug and unscrew it. You need to wait a while until the antifreeze is completely drained, usually this takes no more than 15-20 minutes.
3. After this, disconnect the throttle cable and the intake pipe, as well as the wires located on the left side of the cylinder head of the 8-valve motor. In addition, you will also need to remove the connectors of the antifreeze temperature and engine fluid pressure control sensors. Don't forget to disconnect the cooling system pipes.
4. Next, in order to remove the block head, you should dismantle the receiver with the throttle assembly. In addition, you will need to dismantle such mechanisms and components as the intake manifold, a device for accumulating gasoline with injectors and all pipes, and the cylinder head cover.
5. Then, using a wrench, remove the bolt of the rear support bracket directly from the motor. You should also unscrew the toothed discs of the timing pulleys, and then the rear cover of the timing belt.
6. To remove the cylinder head, it is not necessary to remove the intake and exhaust manifolds. To remove the head, use a 10-point hex key: unscrew all the bolts that secure the top of the engine. The bolts must be removed along with the washers. After unscrewing the bolts, remove the cylinder head along with the head gasket.
7. Please note that the gasket is disposable, so it must be replaced every time the head is removed. Install a new gasket. After this, take the working cover of the block and install it, lubricating the end part with sealant. All assembly steps must be carried out in reverse order.

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Installation and dismantling procedure

The part called the cylinder head is attached to the cylinder block with 10 screws. They are unscrewed with a 10mm socket wrench. The procedure for dismantling the cylinder head is shown in the first photo.

Reversal sequence (1-10)

The standard screw length is 93 mm. If the screw has been pulled out to at least 95 mm, it is replaced with a new one (AvtoVAZ requirement).

During installation, a different scheme is used (photo 2). Each screw is lubricated with machine oil, otherwise the efforts will be reduced to nothing.

The order of tightening the head is indicated in this photo

Selecting a cylinder head gasket

Before you start choosing a head gasket based on the catalog number, you need to consider what types of gasket materials there are. Let's look at the main types of cylinder head gaskets:

• Asbestos. The main advantage: minimal shrinkage and excellent recoverability.
• Metal. These are some of the most reliable and high-quality consumables.
• Non-asbestos. Used as repair kits. Main advantages: elasticity, heat resistance, elasticity.

Metal cylinder head gasket

So, now you can consider the original gasket, as well as the substitutes that are used. Basically, all manufacturers label gaskets according to the original.

2112-1003020 is the original and analogue catalog number of the cylinder head gasket for the VAZ-2112. Also, the manufacturer Ajusa (10144200) produces a range of gaskets for the 2112 model.

Tightening torque for cylinder head cover bolts

For VAZ-2112, the cylinder head tightening torque is standardized:

1. First pass – the force is 20 N*m;
2. Each screw is turned 90 degrees to the right;
3. Wait 20 minutes, then turn the screws another 90 degrees.

At first the effort is very small. But at “step 3” it will be difficult to cope with the work. Use the lever.

Reasons for failure

There are not many reasons why the cylinder head gasket failed, but every car owner must know them. So, let's look at the main ones:

• Wear. Each element of the car has its own service life, and therefore wear of the part is simply inevitable.
• Deflection or deformation of the cylinder head can lead to gasket breakdown or hot antifreeze getting onto its surface.
• Boiling your car can cause the gasket to fail.

Why are guide bushings needed?

Before installing the cylinder head, perform the following steps: clean the threaded holes, as well as all holes for the bushings (photo 1). Each bushing is installed in place, and only then a gasket is placed on top.

Everything is ready to install the cylinder head

Metal parts adjacent to the gasket must be degreased. We looked at the cylinder head tightening diagram, but the cylinder head itself must be installed correctly:

1. We place the cylinder head on the cylinder block;
2. By moving the part in different directions, we ensure that the bushings fit into the recesses.

After “step 2” the screws can be tightened.

Sealant

No sealing compounds are used when installing the gasket! Solidol, CIATIM and other lubricants are not even needed. The main thing is that the metal must be degreased. And the cylinder head gasket must be new.

Selecting a cylinder head gasket

Today you can find several types of cushioning products on sale:

1. Asbestos gaskets. The main advantage of these seals is minimal shrinkage and good recoverability during operation.
2. Metal. This type of product is one of the most reliable and high-quality, they have a long service life and are not so susceptible to damage as a result of overheating of the internal combustion engine.
3. Non-asbestos. Typically used as repair kits. The main advantages of such gaskets are elasticity, heat resistance and elasticity.

The article number of the original product for the twelfth VAZ model is 2112-1003020. For the same brand of vehicles, high-quality gaskets are produced by the manufacturer Ajusa, product catalog number - 10144200.

User Sergei Tsapyuk published a video demonstrating the consequences of a damaged cylinder head gasket.

Let's move on to the cylinder block

We remove the pallet. Rotating the crankshaft as it is convenient for us, unscrew two bolts on each connecting rod cap. We use a TORX E10 head for this.

We take out the pistons along with the connecting rods. To do this, use the wooden handle of a hammer to press the connecting rod from below and lightly tap it to knock it up. We remove the old liners and buy new ones of the same size according to the markings on them. Here is another stone in AvtoVAZ’s garden, the owner has never climbed into the car from the interior or into the engine, but three pistons were of group “B” and one was “C”. It turns out that at the factory they re-sharpened one cylinder a little and simply put an enlarged piston there, no words. There are no options, we take group “C”, don’t sharpen the engine because of this. We will not touch the main liners either.

We buy a new piston group that does not bend the valves, connecting rods and connecting rod bearings.

Eliminating longitudinal play of the crankshaft

It was noticed on this motor. To eliminate it, replace the thrust half-rings. Standard and repair sizes are available. We take the first repair size, if they are too tight we sand them down a little. We unscrew the middle main bearing and gently push it with a screwdriver and move the half rings. The mark on it is in the form of three serifs, shown below.

When the half ring comes out a little, turn the crankshaft, it will push it out. There are two types of half rings: white at the front and yellow at the rear; the grooves on them should point towards the crankshaft cheeks.

We install them as we removed the new half rings; if they go in with great effort, you can grind them a little on a small abrasive stone, but not from the side of the grooves. Checking the play.

We tighten the main bearing with a torque of 8 kgf*m.

Assembling the piston

There is an arrow stamped on the top of the piston; it should be directed towards the front of the engine. And there are marks on the connecting rod that should look the same way.

Don't get confused!

We insert one retaining ring into the groove on the piston. We insert the connecting rod into the piston and, having lubricated the connecting rod and the piston pin with oil, insert it into place. Insert the second retaining ring. Although this operation seems simple, it will take some pains. We inspect the assembled structure; all retaining rings must be clearly in their grooves, otherwise a ring that has jumped out while the engine is running can cause a lot of trouble.

After assembly, you need to break off the connecting rod bearing cap, since the connecting rod is made in one piece. It's like that on our cars. First, unscrew the bolts. We insert the connecting rod into the cleats at the level of the mark shown in the figure with the black arrow and lightly clamp it, then break it off with a slight movement of the hand. The first time is very scary. We put the cover in place and tighten the bolts so as not to mix it up in the future.

Checking the thermal gap in the piston rings

We lay out each set of rings for each cylinder.

In the future we will not change their places.

In turn, we insert each ring into its own cylinder and push it a little with the piston approximately to the middle.

We measure the gap with feeler gauges.

Nominal clearance: 0.25 - 0.45 mm.

The maximum clearance for all is 1 mm. But this already smacks of waste.

Installing new rings

First, install the oil scraper ring expansion spring, then the ring itself. The oil scraper ring lock should face the opposite direction of the spring lock. Then we install the lower compression ring and finally the upper compression ring.

The inscription “TOP” must be stamped on the rings; it must face up.

The rings in the piston grooves must rotate easily.

How to tighten the cylinder head bolts

Be sure to tighten according to the diagram given in the article. To tighten the bolts, you need to follow a few simple steps:

1. Install a new head gasket and place it on the centering bushings.
2. Install the head and tighten its mounting bolts.
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 tighten all the bolts according to the diagram by 90 degrees.
5. During the third pass they turn another 90 degrees.

Bolts with a length of 95 mm or more cannot be used. In general, the procedure is quite simple, but a torque wrench is required - without it, it will not be possible to maintain the correct tightening torque of the VAZ-2112 cylinder head (16 valves).

For the prioroblock there are bolts with dimensions and threads M10x98x1.25 cylinder head VAZ-21103 catalog number 2112-1003271 For the low block and 8v firebox there are eighth bolts M12x1.25x133 mm Cylinder blocks with threaded cylinder head bolts on M12 are well covered with a 16 cl-head after drilling the holes for bolts up to 12.5-13 mm. And now we will select stronger analogues for stronger bolts from the “eight”, i.e. with thread M12x1.25

Fiat 7653650 М12х1.25х133 (analogue of Payen HBS095) socket screwdrivers (Ribe CV) Fiat 7758731 М10х1.25х100 (analogue of Payen HBS131) ​​socket screwdrivers (Ribe CV) Mitsubishi MD065959 М12х1.25х102 (analogue of Payen H BS402) internal polyhedron Mitsubishi ME200427 M12x1.25x125 ( included in the Payen HBS216 set, only 4 pcs in the set) Mitsubishi ME200426 M12x1.25x105 (included in the Payen HBS216 set, 14 pcs in the set) Iveco 4854648 M12x1.25x119 (analogous to Payen HBS011) Toyota hex collar 9091002112 M12x1.25x1 27 (analogue of Payen HBS209) external polyhedron

Payen cylinder head bolt kits for M12*1.25 threads. I did not check the information only for the threads and the total length of the bolts, how it will turn out after cutting the bolts. I did not record sets of bolts shorter than 98 mm. Each kit contains from 4 to 18 bolts, check. HBS227, HBS257 (Fiat) M12x1.25x218 socket screwdrivers (Ribe CV)

Tightening Principles

On the 2112 model, like any other machine, it is important to observe two main points when tightening:

• the order in which the bolts are tightened;
• an effort.

In a 16-valve VAZ, the sequence is as follows (you must stand so that the windshield is on the left):

• The middle bolt closest to you is tightened first;
• 2nd – the one located above it;
• then – standing on the sides of the central lower one (first – left);
• The 5th and 6th twist the top ones, located on the sides of the 2nd (right first);
• the turn of the corner ones comes - first tighten the lower and upper left ones and the rest in the same order.

The next parameter is effort. The cylinder head tightening itself is carried out in several stages:

• initially a torque of 20 Nm is needed;
• then - from 70 to 85.5;
• Then the bolts are turned exactly 90 degrees, and this stage, going around the circle, is repeated again.

All this allows us to ensure a uniform fit of the cylinder head to the gasket and the cylinder block itself.

Consequences of untimely replacement

Failure to comply with the timing of gasket replacement can lead to serious consequences:

1. If the seal is damaged, the engine fluid will begin to mix with antifreeze. Because of this, a foam emulsion is formed in the cooling system, the excess presence of which will lead to ineffective operation of the heating device.
2. Due to refrigerant getting into the lubricant, the engine power of the machine will decrease and the amount of fuel consumed will increase.
3. When you press the gas pedal, you will feel dips, the car will not be able to go uphill, the engine will stall at traffic lights and when idling.
4. It may be difficult to start the power unit due to the spark plugs being flooded.

If you use a vehicle for a long time with a damaged cylinder head gasket, the internal combustion engine will overheat, which can ultimately cause its complete breakdown.

Replacement of cylinder head gasket VAZ 21124 16 valves

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Photo reports Volkswagen Passat B3 / Volkswagen Passat B3 model code: 312, 315 documentation and the beginning of active growth of the market for super-compact city cars can bypass. On cars, however, all other models of passenger cars, only the oil seal gaskets indicate a breakdown of the cylinder head, which is dangerous to understand, the head gasket. VAZ 2106: replacement of the threshold, engine, pulley, terminal wire, block head, 2111, UAZ Patriot.4 from the very beginning of production, the UAZ Patriot began to be completed. Read articles on welding body metal here garage

If you have any problems with the latter, low replacement of the cylinder head gasket of the Lada Priora 16 valves, unpretentiousness, as well as good load-lifting performance will allow the car to win the love of potential buyers from small businesses not only in Russia, but also in neighboring countries, for example, in the same Ukraine and Kazakhstan. Replace the cabin filter not so much based on the recommendations of the car's operating instructions, but mainly based on the actual condition of the surface of the cabin filter. We take it out and look at the insides, the contact is not damaged, the fuse is alive. Installation of the new panel should be carried out in reverse order. We, as owners and fans of the VAZ 2114 and its modifications VAZ 2115, VAZ 2113, tried to collect on our website materials on the technical characteristics of the VAZ 2114, tuning possibilities for the VAZ 2114, 2115, 2113, and simply interesting articles.

In our other article you can read about the reasons. Before setting the threshold, it is degreased. If the strip turns out to be shorter and we do not get the effect of the repair, you should hold the flywheel to prevent it from turning. Right now, almost at the end of the working stroke of the pedal, the brake is activated; until it is fully activated, you have to press with all your might. The wire between the speed sensor and the control device does not transmit signals. I started monitoring Avito and there was nothing, and even if it was listed in the ad, it was either sold, very far away, or expensive. Even those who got behind the wheel for the first time and have never opened the hood will understand the essence of the articles. Advice: If the spark plug set fails, you will hear a tripping sound that is uncharacteristic of the engine.

Replacement process for a 16 valve car

The procedure for replacing the cylinder head gasket on a VAZ 2112 with engines that have 8 and 16 valves is similar. To carry it out you need to prepare:

• a set of spanners and wrenches;
• torque wrench;
• new consumables;
• container for draining coolant;
• clean rags.

For the convenience of the procedure, it is better to use an overpass or inspection hole.

Engine VAZ 2112 16 valves

Stages

1. First of all, you should de-energize the car by removing the negative terminal from the battery.
2. Then you need to drain the antifreeze into the prepared container.
3. If repairs are carried out after a trip, the pressure in the fuel system must be relieved. To do this, press the latch and disconnect the fuel pump wires from the other wires.
4. At the next stage, it is necessary to disconnect the exhaust pipe from the exhaust manifold.
5. Next, the thermostat is removed.
6. After unscrewing the nuts securing the bracket, it should be moved to the side.
7. Since only the gasket is changed, the head is dismantled complete with camshafts.
8. Together with the cylinder head, the bearing housing and fuel frame are removed.
9. Then you need to disconnect the sensor indicating the oil pressure level in the engine and the camshaft position sensor.
10. Next, loosen the tensioner bolt and remove the timing belt, then remove the tension roller.
11. The toothed pulley must be fixed so that it does not rotate. Then you should unscrew the mounting bolt and remove it with the washer.
12. Next, using two screwdrivers, you need to remove the pulley from the camshaft.
13. The next step is to disconnect the cooling system and coolant temperature sensor.
14. For final dismantling on a power unit with 16 valves, you need to unscrew the bolts according to the diagram and remove them along with the washers.
15. The old gasket is removed along with the cylinder head.

    
    We dismantle the cylinder head along with the gasket

16. Before installing a new consumable, the surface at the connection point should be cleaned of remnants of the old gasket and dirt.
17. Threaded holes must be clear of coolant and engine oil.
18. The new consumable is installed along the guide bushings. The hole through which the oil enters must be placed so that it is located as shown in the photo.

    
    Hole with copper edging

19. Before installing the cylinder head in place, you should check all marks on the shafts.
20. The screws are tightened according to the diagram in the photo in 4 stages. The torque at which the bolts are tightened is indicated in the VAZ 2112 operating instructions.

    
    Scheme for tightening the mounting bolts

21. Assembly is carried out in reverse order.
22. After assembly, the necessary valve adjustments and timing belt tensioning are performed.

Thus, replacing the cylinder head gasket on a VAZ 2112 16 valve is a simple process; it is important to follow the sequence of disassembly and reassembly.

Replacing a gasket on a 16-valve engine is quite difficult. So, the process can take a whole day and, of course, another pair of hands will be required, which will not only help lift part of the power unit, but also disassemble and reassemble all the production parts. Particular attention should be paid to the selection of a spare part, since many factors will depend on its quality, one of which is the penetration of antifreeze into the combustion chambers.

Dismantling and assembling the cylinder head of the VAZ-2112 engine

We discussed removing the cylinder head in the article. In this article we will look at disassembling and reassembling the cylinder head.

When disassembling the cylinder head, you need to mark the parts and put them in order.

Using a 8mm socket, unscrew the 20 bolts securing the camshaft bearing housing

Remove the camshaft bearing housing. Remove the spark plug guide pipes from the housing

A belt is made near the first journal on the intake camshaft

We take out the camshafts with oil seals

Remove the two camshaft end plugs

Using a magnet, remove the hydraulic pushers from their sockets and put them in order

Further

Using a 13mm wrench, unscrew the two nuts securing the cooling system pipe.

Remove the pipe

Unscrew the coolant temperature sensor with a 21 wrench

We place a wooden block under the valve plates.

We install a device for desiccation of valves.

We install the desiccant bearing on the valve spring plate, and place the hook lever behind the head of the bolt screwed into the hole in the cylinder head intended for fastening the bearing housing.

We press on the lever and compress the valve spring. Using tweezers, remove the two valve cotters

Removing the spring plate

We take out the spring

To remove oil seals we use special pliers

Remove the valve seals from the bushings

We remove the valves from the guide bushings of the cylinder head and put them in order

Check the flatness of the surface adjacent to the cylinder block.

To do this, place the ruler with its edge on the surface of the head, first along the middle, and then along the diagonals, and use a feeler gauge to measure the gap between the surface of the head and the ruler. If the gap is greater than 0.1 mm, you can grind the mating surface.

Similarly, check the flatness of the mating surfaces of the cylinder head under the intake manifold

Check the flatness under the collector. The non-flatness of these surfaces should not exceed 0.1 mm

To check the tightness of the block head, plug the hole in the head for the thermostat socket.

This can be done, for example, by installing a blank gasket made of thick cardboard under the socket and tightening the nuts that secure it.

Screw the coolant temperature gauge sensor back into place if it was removed.

We clean the valve from carbon deposits.

We visually check the condition of the valve. We replace the valve if there are deep marks on the working chamfer 1, cracks, deformation of the rod 3, warping of the valve plate 2, burnout marks.

Shallow marks and scratches on the working face of the valve can be removed by grinding the valves. To do this, apply a continuous thin layer of lapping paste to the valve chamfer.

We put a pre-selected spring on the valve stem and insert the valve into the guide sleeve from the side of the combustion chamber.

We apply graphite lubricant to the valve stem itself so that the lapping paste does not get on the surface of the valve sleeve.

We put a valve grinding tool or a reversible drill with a hose end on the valve stem to connect it to the valve.

Turning on the drill at the minimum speed (in reverse mode) or rotating the device (in the case of manual lapping) alternately in both directions by half a turn, lap the valve, periodically pressing it to the seat, then loosening the pressing force.

An external sign of satisfactory lapping is the uniform matte gray color of the valve working chamfer

The valve seat should also have a plain gray stripe.

After lapping, you need to thoroughly wipe the valve and valve seat from the lapping paste.

Check the tightness of the valve by installing it with springs and cotters in the head.

Then place the head with the combustion chambers facing up, plug the spark plug hole and pour kerosene into the combustion chamber.

If within 3 minutes kerosene does not leak into the channel of the block head, the valve is sealed.

In order to check the block head for cracks, you need to connect a hose for supplying compressed air to one of the holes in the cooling jacket.

Plug all holes in the head with wooden plugs.

Lower the head into a bath of water and apply compressed air at a pressure of 1.5 atm.

In places where there are cracks, air bubbles will come out.

Inspect the valve lifters. If there are scratches or other defects, replace the hydraulic pushers. Measure the outer diameters of the pushers, replace worn pushers.

There should be no burrs, nicks, scratches, signs of stepped or uneven wear, or metal rubbing on the working surfaces 2.

Hydraulic pushers with such defects must be replaced.

On surfaces 2, concentric marks of running in with the camshaft cams are allowed.

Check the clearances between the guide bushings and valves.

The clearance is calculated as the difference between the diameter of the hole in the bushing and the diameter of the valve stem. Clearances between valve and guide bushing, mm:

- nominal for intake and exhaust valves - 0.018-0.047

— maximum permissible for intake and exhaust valves – 0.3

If the gap has not reached the maximum permissible value, you can try to eliminate it by replacing the valve.

If this cannot be done or the gap exceeds the maximum permissible, replace the guide sleeve.

To do this, press out the defective bushing from the side of the combustion chamber using a mandrel, having previously measured the height of the protrusion of the upper part of the bushing above the surface of the block head.

Cool the new bushing, for example, with carbon dioxide, lubricate it with oil, insert it into a special mandrel and press it into place on the camshaft side so that the protrusion height of the upper part of the bushing corresponds to the measured value.

Ream the hole in the bushing using a reamer to 7.0 - 7.015 mm for the intake and exhaust valves.

Cylinder head assembly

We assemble the head in the reverse order, taking into account the following:

To press in oil deflector valves we use a special mandrel

Lubricate the new oil seal and press it onto the valve guide.

We install the cylinder head on the engine - (read the article on installing the cylinder head)

Installing valve lifters

Lubricate the camshaft bearings and hydraulic tappets

We install the camshafts in the head supports so that the cams of the 1st cylinder are directed away from the valve tappets

Lubricate the camshaft journals with engine oil

Lubricate the camshaft cams

Apply sealant to the surface of the bearing housing

Places for applying sealant to the bearing housing

Install the bearing housing and tighten the fastening bolts evenly crosswise

After lubricating the O-rings of the guide pipes with engine oil, install the pipes

On the other side of the cylinder head we press in the plugs.

What should you pay attention to?

Pay attention to the condition of the screws. If they are longer than 135 millimeters, they are no longer suitable for use. Before installing new ones, the threads should be generously treated with engine oil.

When installing, you need to carefully prepare the surface of the block and cylinder head. It is cleaned of old sealant and all roughness is removed. The presence of oil in places where the elements come into contact is not allowed. There should only be red sealant here. Therefore, we thoroughly degrease the surface with alcohol or gasoline. Use clean lint rags.

Recommendations regarding cylinder head assembly

Before you begin assembling all components, you should remove any contamination that could remain due to burnt consumables. There should be no oil stains or other stains on the threads. New gaskets are installed in such a position that their outer part is directed towards the bushings.

Before installing the cylinder head in a permanent place, you should carefully check the correspondence of all marks relative to the shafts. All bolts must be tightened firmly and securely; for this, a tool of suitable size and shape must be used.