Disassembly, repair and assembly of the cylinder head of the VAZ 2170 Priora

02/28/2022 12,835 VAZ Priora

Author: Ivan Baranov

Often, when overhauling an engine, it is necessary to remove, disassemble and reassemble the cylinder head. The article discusses how to remove the head on a Lada Priora 16 valves. Also included is a video with a detailed video report on the assembly and disassembly of the cylinder head.

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What is a cylinder head?

The cylinder head is one of the main components of the engine. It consists of a cover that serves to protect internal parts from external environmental influences. The cylinder head is made by spot casting from cast iron or aluminum alloy. To remove residual stress that occurs during the casting stage, the product is artificially aged using mechanical processing.

The lower part of the cylinder head is more expanded, thus it more reliably protects the insides of the block. The inside of the head is perfectly smooth. The unit consists of a large number of elements.

Structure of the Lada Priora cylinder head

In the upper part of the cylinder head there is space for camshaft bearing housings, valve springs, bushings and support washers, as well as for the gas distribution mechanism. Since the head consists of a large number of parts, the process of assembling and disassembling the cylinder head is very labor-intensive. Together, the parts of the unit convert the energy from fuel combustion into mechanical energy, which allows the vehicle to move.

When is it time to change?

When operating the car, you should constantly ensure that the cylinder head is sealed against the block itself so that there are no leaks of working fluids. Like all car components, the cylinder head requires regular maintenance. Parts that are under constant load require more attention. These include components of the gas distribution mechanism: valve seals, valves, camshaft seals, gasket. The service life of its components and assemblies depends on the quality of car maintenance.

Cylinder head repair

Replacement of consumables should be carried out according to the recommendations specified in the Lada Priora service manual. Oil seals and gaskets should be replaced as they wear out or if they are externally damaged. There are a number of operations that require dismantling the cylinder head: modification and grinding of seats, replacement of valves, crimping of valve seats and bushings, and others.

The cylinder head on a Lada Priora 16 cylinders must be replaced if chips, cracks, and signs of corrosion are detected during its visual inspection. During repairs, the following work can be performed:

• change gaskets;
• camshafts are being replaced;
• change hydraulic compensators if they are faulty;
• change bent valves if the timing belt breaks.

Let's get inside the car

Tuning VAZ 21124 includes changes to the internal world of the car. Replacing the pump and timing belt for VAZ 2110, 2111, 2112, Lada Priora, Lada Granta, Lada Kalina. (16 valves) is the pump leaking? How to change the pump on a 16 valve engine? Additional devices are installed in the VAZ interior and the old ones are improved; sports seats, a steering wheel and airbags are installed. For a chic look, the VAZ 21124 lacks door trim, new armrests, interior handles and wooden pockets.

In the world of car tuning design, there is a wide range of PVC fabrics for ceiling upholstery, many options for door cards and leatherettes, which differ in color and design.

beautiful in the new VAZ 21124 , especially in yellow, red or blue. Replacing the timing belt on an 8-valve Lada Granta engine directly with your own hands is almost no different from that performed on the 16-valve version of the domestic Lada Granta. Don't forget about podiums for speakers and columns; they come in different diameters, colors and models.

If desired, corner covers, door inserts, sun visors, decorative floor coverings can be installed in the interior; it all depends only on your imagination.

Tuning VAZ 21124 photo

Tuning the VAZ 21124 changes most of the car’s system, so this car can rightfully be classified as a high-speed car. It’s so nice when on the road, your car easily bypasses other cars, moves easily and does not make noise when accelerating quickly. Installation of a turbine on a VAZ 21124 . high-quality braking system, steering, improved suspension for maneuverability and easy handling - all this is called car chip tuning.

How to disassemble?

Removal, disassembly and assembly of the cylinder head for repair and modification consists of the following steps:

1. First of all, it is necessary to cool the engine and relieve pressure in the fuel system.
2. To de-energize the car, you need to disconnect the negative terminal from the battery.
3. Before removing the unit, the coolant must be drained.
4. Next, we dismantle the cylinder head and install it so as not to damage the valves for further repairs and modifications.
5. After unscrewing the fastening nuts, we dismantle the power unit support.
6. Next, we sequentially remove the fuel pipe bracket, phase sensors, coolant temperature sensors, emergency oil pressure warning light, and temperature indicator.
7. Then you should remove the thermostat with the gasket installed under it.
8. To avoid damage, remove the spark plugs.
9. Next, remove the camshaft bearing housing.
10. At the next stage, the camshafts and oil seals placed on their front ends are removed.

Removed camshafts

• The hydraulic pushers should be removed from the cylinder head holes.
• Now carbon deposits are removed from the combustion chambers.
• Next you need to inspect the unit. If cracks, scratches, chips, or traces of burnout in the combustion chambers are found on it, then it must be replaced.
• Burrs and nicks should be removed from the surface of the unit.
• Next, using feeler gauges and a ruler, you should check the evenness of the surfaces under the intake manifold and catalytic converter.
• Now you need to check the tightness of the cylinder head.
• Then we check the surfaces on which the camshaft journals rest, as well as the bearing housing. If there are any defects, it should be replaced.
• Then we wash the oil channels and check the tightness.
• The next step is removing the valves. If scratches, deformation of the rod or plate, or signs of burnout are found on the valves, they need to be replaced.


Checking the suitability of valves

• Next, remove the valve stem seals and, if necessary, replace them.
• It is necessary to check the condition of the saddles. If necessary, they are modified.
• Significant valve defects can be eliminated by reworking and grinding. After which the valves are ground in.
• Next, you need to check the condition of the valve springs and their elasticity. Replace if necessary.
• After checking all components and modifying the valves, you need to insert them into the cylinder head at the previously marked places, lubricating the rods with engine oil.
• Then the valve stem seals, camshafts and bearing housing are installed.
• Next, install the cylinder head in place.
• When installing the head, be sure to replace the gasket. The fastening bolts should be tightened according to the torque specified in the manual for the Lada Priora car.

Video “Cylinder head repair and configuration”

This video talks about repairing the cylinder head of a Lada Priora.

Cars of the VAZ-2112 family were produced with one of two 16-valve engines - 21124 and 21120. The displacement of these engines is different, and only one part called the “cylinder head” is used - it is designated by the numbers 2112-1003011. There are rumors that the cylinder head from the 21120 engine does not fit the 24th engine, but a reverse replacement is possible. However, there is only one article in the spare parts catalog, and it is suitable for two motors at once. Next we consider what actions to repair the VAZ-2112 cylinder head you can perform yourself. We will only talk about 16-valve engines.

An example of dismantling is shown in the video. Let's see.

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). The Priora is equipped with such a motor - it is quite powerful, has excellent characteristics and does not require frequent maintenance. Two camshafts drive the intake and exhaust valves.

The camshafts rotate in special sockets, which are located directly in the head. The difference between 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. At the front of both camshafts there are self-clamping type oil seals.

Dismantling the cylinder head

First of all, to get to the cylinder head, you need to remove the cylinder head cover. For different 16-valve engines, this operation is different, and the cover part numbers also look different: 2112-1003260 (-10) and 21124-1003260.

Engine cover VAZ-21124 (1.6 l)

You will also need to remove the timing belt - there are no differences between different engines.

Let's look at how the exhaust manifold can be detached from the cylinder head. On engine 21120:

Remove the exhaust pipe of the muffler: unscrew two nuts 1 (key “13”), remove the clamping bar, unscrew six nuts 2 (key “14”) and dismantle, not forgetting to turn off the oxygen sensor. The photo shows three of the six nuts.

Elements of the exhaust pipe

Everything important is under the screen

Now we will talk about engine 21124:

1. Disable both oxygen sensors. We unscrew the three nuts securing the protective screen (with a 10mm wrench) and disassemble the bracket by unscrewing the four nuts with a 13mm wrench.

How to disassemble the mounting bracket

Operation with additional muffler

Here we believed that the VUT hose was disconnected from the intake module. Finally, the spark plugs are unscrewed on any of the engines (a “16” tubular wrench).

The tightening torques for the mounting screws are given in another text. In general, on VAZ-2112 hatchbacks, cylinder head repairs begin by replacing the “extended” screws with new ones. The length should be 95mm or less.

The order of unscrewing (left) and tightening the mounting screws

Tuning yellow iron

The VAZ 21124 includes “yellow iron” tuning, in which stabilizers (for agility), reinforcements and braces (for road stability) are installed. However, be careful with counterfeits of these parts; at worst, they will damage the car, and at best, you will be throwing away a lot of money.

Feel like a real circuit racing driver with the VAZ 21124 hatchback . All you need is to install additional parts: a nameplate (symbols) on the handle of the car, neon lighting under the bottom of the car, an air intake on the hood and roof. The installation of front and rear bumpers with an aerodynamic body kit will add power to the car.

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.

Repairing engine 21126 VAZ 2170 Priora after timing belt break

Today we brought one of the old clients to the Priora, as it turned out, the jammed pump broke the belt and, as a result, the valves were bent.

But progress at AvtoVAZ does not stand still, and if on the engines of the tenth family the valves were simply bent, then on the Priora 126s the connecting rods also lose alignment and, if they are not changed, there is a high probability that the engine will begin to eat oil and, accordingly, your money. Glory to the designers of AvtoVAZ!

But every cloud has a silver lining, there are sets of pistons for 126 engines with grooves that do not bend the valves. In this article we will describe the procedure for repairing the cylinder head after a broken timing belt, as well as replacing the piston. Removing and installing the timing belt is described in this article, so we will not dwell on it in detail.

To perform this procedure, torque wrenches are required!

Conclusion

Thus, a major overhaul of the cylinder head of the 16-valve VAZ 2112 engine is being carried out. This process at a car service center will take 1-2 days, but in his garage a car enthusiast can spend much more time, since the lack of tools will affect him. Thus, it is recommended to carry out cylinder head repairs at car repair shops, where everything will be done much faster and with better quality. Of course, this will hit your pocket, since high-quality and major repairs of this part will cost on average about 7,000-10,000 rubles. along with spare parts.

Adjusting the tightening torque of bolts for a 16 valve car

Adjusting the tightening torque is a simple process, and after reading the material and video in this article, you can handle it yourself. It is enough to tighten it once and then you will be able to do it yourself and at the same time you will be able to help your friends if necessary. It is important to adhere to the diagram for cars with a 19-valve engine and observe the timing.

Required Tools

Scheme

The pattern for tightening on a 16-valve engine differs from the pattern for an 8-valve engine, so we will present both one and the other so that you can compare them.

Just don't get confused when you install. In any case, before starting work, check the instructions that came with the car. Tightening with different torques on a 16 valve unit occurs in 2 circles with different torques, and then another 2 circles with a rotation of 90 degrees. Nothing is difficult, which means you can cope on your own.

Stages

In order for self-tightening of bolts to be completed successfully and to last for a long time, a number of simple rules should be followed:

By following these simple rules, you can guarantee the best tightening and a reliable tight connection.

Place the cylinder head on the block, first making sure that the crankshafts and camshafts are set to the top dead center (TDC) position.

The tightening process itself takes place in 4 circles:

• 1st circle - moment 20 N m (2 kgf/m);
• 2nd circle - moment 69.4–85.7 N·m (7.1–8.7 kgf·m);
• 3rd circle - turn the bolts 90 degrees;
• 4th circle - another 90 degree turn.

As you can see, everything is simple. If you have any questions, watch the video. In terms of time, this work does not take more than twenty minutes, but it allows you to save a decent amount, which they will charge you at the service station.

Video showing cylinder head repair (1.5 l engine)

If, when starting the 16-valve Priora engine, you hear knocking noises in the engine compartment, which will disappear as the power plant warms up, then you should check the hydraulic compensators (HC). When every start of a cold engine is accompanied by a knocking sound, this is a clear sign of a worn hydraulic compensator. We will tell you how to replace expansion joints yourself. We will also look at a component such as the cylinder head check valve, which can also cause defects in the operation of compensators.

Hydraulic compensators are sensitive to the quality of lubricant. If mechanical impurities are present in the oil, the part may fail ahead of schedule. Faulty hydraulic compensators cannot be repaired. After installing new compensators, you may be upset by the knocking of the remaining main valves - this is normal, but not for a long time.

Meet the model

With the new engine, the unit was given the name VAZ 21124, this car intensively fights against the ecology of the external environment. In addition to everything, when the car starts, the traction at the bottom has become noticeable, and the engine now runs calmer, without large jumps. We often hear questions from owners of 16-valve engines: “What needs to be done to prevent the valves from bending in the piston?” In Veil 21124, this task will not exist for you, in the bottom of the piston there are holes and sports shafts that keep the rise of the piston under control, and don’t let the knocking and noise of the VAZ 21124 engine frighten you, this is its normal environment.

Upgrading a car is currently the most important goal for every modern and self-respecting driver. Tuning VAZ 21124 contains configurations of both the internal and external features of the car. Replacing the cylinder head gasket of a VAZ 2114 8 8 Kalina valves with your own hands). Styling the exterior of a car includes installing a body kit on the bumper fenders, sills, hoods and doors, this gives your car a special, sporty look, and also improves its aero performance. To create a sports car VAZ 21124 . It is impossible to do without replacing body elements with plastic material. Plastic parts reduce the weight of the car, making it easy to drive on the road. The final feature of a sports car is the installation of alloy wheels and sports tires.

Determining the faulty hydraulic compensator

Hydraulic compensators, which are also called hydraulic pushers, adjust the engine valve clearances on the Priora 16 valve. Below is a diagram of how the main body is dismantled and replaced, but first you should find out how to identify a defective part among the rest.

Checking compensators is carried out as follows:

1. In turn, press on each main body with a screwdriver. Check that the camshaft cam is facing the pusher with its back;
2. If the compensator is working properly, you will need to apply considerable force to press it;

There is another method - place the cams with the protrusions facing up. Now you need to check if there are gaps between the cams and the main body. When recessing the tested part of the Priora 16, it is necessary to compare the speed of its movement with the rest of the pushers. If you find a gap or the main body drops too quickly, then you should remove the pusher and inspect it for contamination.

Checking the cylinder head check valve

When disassembling the pusher, you will come across a cylinder head check valve, which contains a ball with a spring. Inspect the cylinder head check valve; if these elements are damaged, then only replacing the pusher will help. The cylinder head check valve along with its components can be replaced entirely, but these parts cannot be found in every car store. They are not in demand, as it rarely fails.

When you inspect the check valve, check whether it is dry or not. If the hydraulic compensator is working properly, then the check valve should be in oil. You can pour lubricant into it and see why the oil leaves.

Replacing expansion joints

Experts recommend letting the Priora with 16 valves sit for two days and not start it. This is done to ensure that all the HA lubricant flows into the crankcase.

After checking how many pushers in the system are malfunctioning, you can go to a car store and purchase new parts for the Priora 16 and some consumables: oil seals, camshaft plugs, anaerobic sealant.

Work begins with removing the air filter, wiring, which will prevent you from removing the coil and intake manifold. Also remove the throttle body. The most difficult thing will be to dismantle the collector - its mount is located under the generator. To get to it, you need to unscrew the generator fasteners and remove its belt. Using a suitable tool, move the Lada Priora generator to the side;

After such repair of expansion joints, the knock may remain. If a lot of time has passed and the defect does not go away, then it is worth checking the cylinder head itself. Perhaps the hydraulic compensators are knocking due to the lack of the required amount of lubricant. Check the oil channels in the cylinder head. If they are clogged, you will have to clean them.

Engine operation after replacing the main engine:

Signs of a burned out cylinder head gasket

This usually happens in the areas between the cylinders. This is the thinnest part of the gasket. And the degree of damage varies. Also, signs that the gasket requires replacement depend on which of the channels in the block wall is damaged:

1. Oil.
2. Cooling systems.
3. Both at once.

If the oil channel is damaged, engine oil will begin to enter the working cylinder. This will cause rapid oiling and failure of the spark plug. Misfires appear. The engine "troits". This sign is, in general, common to all options. Oil consumption increases.

If there is a breakdown in the cooling system, then with minimal engine heating, the coolant in the expansion tank bubbles. The impression is that the engine is “boiling”, although the temperature is normal. There is a copious flow of condensate from the exhaust, with the smell of coolant. Well, damage to two channels on the Priora leads to liquid getting into the oil pan. The oil turns gray and bubbly. This is immediately visible on the oil level dipstick. Compression in the cylinders of the Priora engine also drops.

Attention! If a burnout of the cylinder head gasket is detected, it must be urgently replaced. Do not put it off for a long time to avoid major engine repairs.

The Priora cylinder head gasket is made of special paronite and metal. When purchasing a replacement from a store, you should carefully check the part for cracks and breaks. Unfortunately, such defects are not uncommon.