Overhaul of VAZ 2109 engine

The power unit is the most durable part of a car when used correctly. But even it requires major repairs after a certain period of time. The timing of the overhaul depends on the timeliness of the technical inspection and ongoing repair work. With proper engine care, major repairs of the VAZ 2109 engine can be avoided until the odometer reaches 150,000 km. If you use the power unit irrationally, repairs may be required much earlier.

Overhaul of the VAZ 2109 (KR) engine involves disassembling the engine into parts, carrying out diagnostics, repairs, and, if necessary, replacing individual components and assemblies. Typically, engine components are repaired by metalworking the elements, then the crankshaft is ground, the cylinder head is milled, and the engine block is cleaned and processed. If you are the owner of an imported car, it is better to entrust this procedure to professionals - service station employees. And Lada Samara drivers can easily repair a VAZ 2109 engine with their own hands, knowing the technology and the sequence of work.

Factors for the need for CR

To identify the need for a major overhaul of the Nine, you need to monitor the “symptoms” of your specific car. There are cases when, to eliminate a malfunction, it is enough to make do with scheduled repairs or spot replacement of components. But in some situations, such “refreshing” is not enough, and a faulty unit requires a radical restoration.

It is a mistake to believe that the most important criterion by which the overhaul period of the Lada 2109 is determined is mileage. This is not entirely true. If the driver carefully operates the engine, carries out timely maintenance, replaces the oil filter, oil, and coolant, then even when the indicator reaches 100–150 thousand km on the instrument panel, the car is not in danger of major repairs. And it happens the other way around. With a relatively low mileage, but irrational use of the engine, diagnostics show the need to completely repair the power unit.

The mileage goes on, and the need for major repairs is indicated by specific signs:

• oil consumption increases;
• compression (compression) in the cylinders decreases;
• fuel costs increase;
• There is a knocking sound in the VAZ 2109 engine.

An increase in oil consumption in the absence of leaks indicates wear of the piston rings and the inevitability of major repairs. If the engine is breathing, that is, oil leaks occur, you can get by with scheduled repairs. The frequency of replacement is also affected by the condition of the guide bushings and oil seals.

The second factor is the deterioration of the crank mechanism (crank mechanism). The quality of performance of the functions of the crankshaft is indicated by the compression value (maximum pressure in the combustion chamber at the greatest compression of the piston). This indicator can be measured using a pressure gauge, which is fixed in place of the pressure sensor. In this case, the engine must be running. We compare the obtained values ​​with the passport compression indicators (for the VAZ 2109 it should be in the range of 9.5–13 atmospheres). If the measured value does not reach the norm, there is severe wear of the bearings or hydraulic pump.

You cannot ignore such signs as a decrease in the stability of the internal combustion engine, the appearance of characteristic sounds (tapping, tinkling) at idle speed, an increase in gasoline consumption and a decrease in traction. There are times when the engine smokes. If one of these symptoms appears, you can do without major repairs, but if the problems appear in a complex and the engine does not pull, then, most likely, diagnostics will show the need for extensive engine repairs.

If the unit is running to the point of emergency, the VAZ 2109 engine may need to be replaced.

Boring cylinder blocks

If a number of previous operations could be performed with one’s own hands, then to bore cylinder blocks it is necessary to hire a master who has the skills to work on special equipment.
The owners of the car take out the cylinder block and give it to the craftsmen for boring, and after restoration they put the cylinder blocks in their original place. The cylinder head has a sufficient margin of safety and a solid resource to operate it for quite a long time, and rarely breaks ahead of schedule. Cylinders are mostly repaired on a scheduled basis, but sometimes are subject to immediate repairs. For example, when you need to weld a hole in the block, which is formed by a break in the connecting rod mechanism.

Sometimes a car owner wants to bore cylinder blocks, not for routine repairs, but in order to increase engine power. Under the influence of such a process, which is called boosting, the combustion chamber increases in working volume, which leads to a significant increase in power. Before performing such an operation, all risks are carefully calculated, because forcing can bore both the block and the head so much that the walls of the head can become deformed and become unusable.

When boring cylinder blocks, expansion of the seat slots is provided - liners are used that have already been increased in size. To know exactly their parameters, you should consult with a specialist who will perform this operation. Determination of new sizes is carried out using a bore gauge.

The boring operation is carried out on a special machine at low speed, showing certain skills in this area. When boring, it is necessary to simultaneously adhere to the dimensions of the future cylinder, not to disturb its shape and adhere to the principles of high-quality processing

It is also very important to adhere to strict positions - the cylinders must be placed strictly parallel and perpendicular to the camshaft bed. And it is important that during boring there is an allowance left so that the axis does not move during honing - the final operation during boring to correct possible defects during the previous operation

This completes the overhaul of the VAZ 2109 engine and it is necessary to assemble and install the power plant in its original position. After the final stages of assembly and filling with antifreeze, technical oil and water for further operation, manipulation of the valves is certainly carried out. This operation will be the final one as part of a major overhaul of the power plant.

Engine overhaul is carried out after a certain mileage of the car. The engine can be replaced completely, or its individual parts are changed - to determine which parts have already worn out and need to be repaired, a thorough diagnosis is carried out. The fact that the engine needs a major overhaul is recognized by high oil consumption, compression checks and comparison with control ones in the cylinder. With characteristic engine sounds and a drop in power of the power plant.

When the owner took good care of his car and regularly carried out maintenance, changed the oil and air filters, then the timing of major repairs comes later. If the car owner neglected the needs of his vehicle, the need for major repairs would approach faster.

General overhaul technology

A major overhaul of the VAZ 2109 internal combustion engine is used to completely restore the nameplate technical characteristics of the power unit. The main stages of repair work are as follows.

1. Replacing piston rings.
2. Grooving of cylindrical rings.
3. Cleaning and processing of the crankshaft.
4. Replacing bearings.
5. Cylinder head repair.

During the repair process, the piston rings are replaced, and the cylinder rings are ground and finished. This must be done using turning equipment, so it is better to entrust this procedure to specialists. Due to the bore of the cylinders, it is necessary to replace the pistons with new ones; To replace the piston, special mandrels are needed.

The crankshaft often requires a good cleaning and treatment. Due to its structure, this element is susceptible to clogging with dirt and debris. When the lubrication hole is clogged, the crankshaft journals do not receive enough lubrication, which leads to a decrease in crankshaft efficiency.

It is necessary to replace the main and connecting rod bearings, because their wear causes Lada engine malfunctions. A very important step is repairing the cylinder head. Support plates, valves, and return springs are repaired (replaced).

When carrying out a major overhaul of an internal combustion engine, do not forget about the accompanying devices: generator, injector, fuel pump, thermostat. If malfunctions are also detected in their operation, the unit should be repaired or replaced.

Before you start working on the engine, you should decide what procedures you will perform yourself (disassemble, sort through, clean, process). It is better to entrust cylinder boring to a specialist. The quality of the repair also depends on the location where it is carried out.

It is most convenient to carry out the inspection in a garage with its own inspection hole.

Certain criteria are used to judge whether a VAZ 2109 engine needs to be overhauled:

• the first and most important sign is an increase in engine oil consumption, which ambiguously indicates practical wear of the piston rings; it is necessary to reconsider the guide bushings and oil deflector caps that have not developed their technical capabilities;
• The final life of the crank assembly, the most important of all engine parts, is checked by measuring compression in the cylinders. For this purpose, the pressure meter is dismantled and a pressure gauge is screwed into place - the power plant must be idling during the procedure. Readings are taken and the indicators are compared with control parameters - if the figure is much less than the control one, with a high degree of probability we can conclude that the bearings and hydraulic pump have exhausted their service life and require immediate replacement with new spare parts;
• With characteristic tapping sounds and unstable operation of the power plant at idle, the consumption of an increased amount of gasoline than usual and the inability to achieve full power in the operation of the power plant is recognized as a disorder in the operation of the engine. These moments signal problems in the units around the power plant, but based on the complex of all the signs, it is clearly possible to conclude that a major overhaul is to be done in the near future. When trying to delay major repairs, you need to diagnose the power plant, replace one of the unit parts, or simply tune the engine for full operation. If a set of such measures does not work and the problems remain, it will be almost impossible to dismiss the overhaul of the power plant. Unless the owner completely gives up on his iron horse and puts it in the garage.

Upon completion of a major overhaul, all regulatory characteristics must show restoration to the parameters specified in the certification:

• the piston rings are replaced with new spare parts, and the cylindrical parts are bored and processed on a special machine designed for this purpose;
• using special mandrels, the cylinder rings are mounted where they were before;
• the crankshaft journal is completely restored or substantially processed to the required size;
• the main and connecting rod bearings are replaced and the cylinder head is repaired;
• are overhauled or new support plates, valves and return springs are installed;
• Attachments such as generator, injector and gasoline pump are reviewed for wear.

Disassembly, repair and installation of the engine

To begin, drain the operating fluids and detach the attachments and auxiliary elements. Next you need to disconnect the unit from the gearbox. Now you can pull out the block using a hoist.

The piston group is replaced in most cases. If desired, it can be restored using special equipment, but this can be even more expensive. We insert the piston assembly with the connecting rod inside the cylinder. Then we place the connecting rod in the groove of the crankshaft journal, insert the liners, and lubricate all the parts. We mount the lower covers on the connecting rods (each connecting rod has its own cover).

We fix the oil pressure sensor and other auxiliary parts. This completes the installation of the VAZ 2109 engine.

The engine is overhauled in the following cases: destruction of the pistons due to a broken timing belt; natural wear of the piston group; compression loss in the cylinders.

Before starting work, you can think about tuning (improving) the engine. Whatever the car, it is possible to increase the number of horsepower, and without significant costs. Let's look at the main stages of repair work so that you have an idea of ​​what you will have to face.

Removing the engine from the car

This procedure cannot be avoided, since the motor must be removed, otherwise it simply cannot be completely disassembled. During the preparation stage, disconnect the battery to de-energize the power supply system. All attachments must be removed - carburetor, air filter, generator, starter, exhaust manifold, etc. Before dismantling the engine, you can also unscrew the cylinder head. Work with it will be carried out separately. Drain the oil from the crankcase, after which you will need a winch and assistants.

Four bolts secure the gearbox to the engine block. The engine and body on VAZ 2108-21099 cars are attached using one cushion. Suspend the engine on a cable and unscrew all the bolts, pre-treating the connections with penetrating lubricant to make work easier. For convenience, you can remove the hinges at the very beginning and move the hood to the side, this way you will have more space. After the final removal of the engine, you begin to disassemble it.

Now it’s worth talking about the requirements for each element of the motor.

DIY VAZ 2109 engine repair video

1. Remove the engine from the VAZ 2108, VAZ 2109, VAZ 21099 (see “Removing the engine”). 2. Place the engine on strong supports. 3. Carefully remove the gearbox. Make sure that the splined end of the input shaft does not rest on the diaphragm spring petals. 4. Remove the clutch from the engine (see “Clutch repair” in section 5 “Transmission”). 5. Remove the camshaft drive belt, the tension roller and the spacer washer installed under it (see “Replacing the camshaft drive belt on VAZ 2108, VAZ 2109, VAZ 21099 cars and adjusting the belt tension”) (see “Replacing the tension roller”) . 6. Remove the camshaft gear (see “Replacing the cylinder head gasket”).

7. Unscrew the four bolts (three of them also secure the water pump) and the nut securing the rear camshaft drive belt cover, and remove the cover.

8. Insert a screwdriver between the water pump housing flange and the block, and slide the water pump out of its seat. Remove the water pump. 9. Remove the head from the cylinder block (see “Replacing the cylinder head gasket”).

10. Unscrew the sixteen oil sump mounting bolts and remove the oil sump along with the gasket.

11. Unscrew the three bolts securing the oil receiver (spring washers are installed under the bolt heads) and remove the oil receiver.

12. Unscrew the bolt (a spring washer is installed under the bolt head) securing the oil level sensor in the oil sump. Remove the oil level sensor from the cylinder block. If necessary, rotate the crankshaft so that the crankshaft counterweight does not interfere with removing the oil level sensor.

13. Rotate the crankshaft so that the piston to be removed is at bottom dead center (BDC). Unscrew the two nuts securing the connecting rod cover.

14. Remove the connecting rod cover. If dismantling the connecting rod cover is difficult, first remove the connecting rod cover with gentle blows of a hammer. The cylinder number on the connecting rod cap may not be visible; in this case, mark the connecting rod cap with the cylinder number.

15. Push the connecting rod with the handle of a hammer into the cylinder and carefully remove the piston and connecting rod from the cylinder. At the same time, make sure that the lower head of the connecting rod does not touch the cylinder mirror, otherwise the mirror may be damaged. Remove the remaining pistons in the same way.

NOTE If you intend to remove the piston from the connecting rod, mark the piston with the cylinder number to avoid mixing up the pistons during installation. The cylinder number is stamped on the connecting rod, just like on the cover; if it is not visible, mark the connecting rod.

16. Remove the flywheel (see “Removing, installing and troubleshooting the flywheel”).

17. Remove six bolts (spring washers are installed under the bolt heads), remove the crankshaft rear oil seal holder and gasket.

18. Remove the timing pulley from the crankshaft. If the key does not fit tightly in the crankshaft groove, remove the crankshaft key so as not to lose it.

19. Unscrew the six bolts (there are spring washers under the bolt heads), remove the oil pump and gasket.

Cylinder block

In any case, it needs to be repaired. First of all, clean the entire surface of oil, dirt and other deposits. The repair consists of boring the sleeves to the required size. You cannot carry out this procedure yourself; it is better to trust a specialist. The lathe who carries out the boring must have the skills to operate the machine. Do not trust such a task to an inexperienced person. Its reliability depends on how correctly the overhaul of the VAZ 2109 engine is done.

There are two boring options: under the mirror and with a fine mesh. In the second case, honing is done - the entire inner surface of the liners is covered with thin lines. Some people claim that this gives a boost in power. But in reality, the picture is the opposite - the wear of the piston rings increases, since the surface of the cylinder is similar to an ordinary file. Fortunately, this continues for 10-20 thousand km, after which the sleeve takes on a mirror-like appearance. Moreover, the geometry is not always ideal. For this reason, it is better to carry out boring under a mirror.

Cylinder head repair

Continuing the repair of the VAZ 2109 engine with their own hands, they begin to repair the engine head. If the diagnostics revealed traces of poor-quality milling, and antifreeze leaked into the oil channel through scratches on the surface of the head. In order to restore the cylinder head, it should be removed and ground - a smooth surface will prevent oil from leaking and losing its professional properties.

Continuing disassembly of the cylinder head, remove the rocker with the spring base and examine the place where the rocker comes into contact with the spring. As the rocker wears out, its upper part becomes noticeably rounded - when installing the rocker obliquely, better regulation of the gap between it and the GDV shaft is necessary. And if the rocker itself is installed at an angle relative to the shaft, then it is no longer suitable and must be replaced with a new spare part. Then the valves and other parts are removed, the shaft and pushers with washers for adjustment are removed.

The condition of newly opened wells with pushers that operate inside them is checked. If the valve guide is severely worn during further operation of the machine, the pusher deviates from the specified trajectory, and the wells cease to be round and take on an unusual oval shape. In this case, it is no longer enough to change only the guides - it is better not to save money and buy a new cylinder head - in extreme cases, the head is processed on a boring machine and the bronze bushing is pressed.

Next, you need to start inspecting the studs and the integrity of the threads on them - if the threads are broken, it is better to replace the stud with a new one. Then the head will easily take its place, because a pin with a poor-quality thread is screwed in with considerable effort, and is even more difficult to unscrew. After restoration, restored or new spare parts are returned to their places along with a new cylinder head gasket.

Is it worth lightening the pistons?

If you are interested in the idea of ​​tuning in order to increase power, then the answer is clear: it is necessary to lighten the pistons! But if it is in your interests only to make repairs, then it is enough to install new ones. In any case, the increase in horsepower will be noticeable, as engine compression will increase. It is best to entrust the work of lightening to the same turner who is engaged in boring the cylinder block. As you can see, you cannot do a major engine overhaul with your own hands; you will have to resort to the services of specialists.

Crankshaft and its relief

This is perhaps the most massive element of the entire engine. If you only need to carry out a major overhaul of the VAZ engine, then you can limit yourself to replacing the main and connecting rod bearings. But if you are looking to increase power, you will need to do a lot of work. Moreover, it will again be impossible to do without the services of a turner. After all, only by using professional equipment can you get rid of “excess” metal on the surface of the crankshaft.

But don’t forget about one feature. The crankshaft has an axis of rotation, its center of gravity is located in such a way that no beating occurs. When you grind off metal, the alignment is disrupted. And by installing such a crankshaft, you will simply destroy both the bearings and the cylinder block housing. Therefore, after lightening, it is necessary to do balancing in order to restore the alignment of the shaft. But after a major overhaul, the engine will be much more powerful, which will surprise you beyond words.

Overhaul of VAZ 2109 engine

Repairing the engine of any car is a very scrupulous and rather labor-intensive task, requiring not only experience and knowledge, but also certain specific equipment. Therefore, it is advisable to entrust this matter to companies that professionally repair cars, even when it is not a foreign car, but a VAZ 2109 device from the domestic automobile industry. They will repair the VAZ 2109 engine in the shortest possible time, the price of which will not greatly affect your pocket, compared to costs that can be incurred by repairing it yourself, in a home garage.

Flywheel and clutch block

For tuning, these components should also be modified. As with the crankshaft, you will need to cut off a layer of metal from the inside of the flywheel. After this procedure, balancing is also necessary so that axial runout and, as a result, vibrations do not occur. You will need to use a reinforced clutch. Give preference to samples that are used for newer and more powerful car models. Based on what increase in horsepower you want to get in the end.

What is the service?

The engine is the key part of the car. Without it, it will not be able to perform its main function as a means of transportation. If the engine breaks down, there is a risk of losing control of the car on the road, so repair or replacement of this part should be carried out immediately when a malfunction is detected.

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  Choosing the right oil for the VAZ 2109 box

Carrying out a complete diagnosis and major repair is not so easy and it is not done everywhere. Especially when you consider that the car model is not the most common and certainly not a new product. Although there are skilled handicraftsmen who can carry out major repairs for a very modest fee, none of them can guarantee the quality. In addition, you will still have to pay extra for replacing engine components, so the savings in the end will not be so significant.

Oil pump and cooling system

Improving these components is extremely necessary when carrying out tuning. Lubrication of all units may be insufficient, as torque and power increase due to the lighter weight of the main elements. Carefully troubleshoot the oil pump gears so that the gaps are minimal. As for the cooling system, it would not be a bad idea to install a more efficient pump and a radiator with a larger area. A major overhaul of the 2109 engine, provided that there is no need to do tuning, can be done without these procedures.

Block head repair

This unit is responsible for the quality of sealing of the combustion chamber at the moment of ignition of the mixture. Therefore, you should achieve maximum contact between the valve surfaces and the seats in the cylinder head. To do this, it is necessary to carry out grinding. The work is not difficult, but tedious and long. You will need a drill with reverse (even a hand-held one will do), a piece of rubber hose, two clamps, a metal rod, lapping pastes - finishing and coarse. Please ensure that after carrying out the work there are no abrasives left on the surface of the cylinder head. Clean everything and blow it out with compressed air.

First, a rough lapping paste is applied to the seat. Using a drill, rotate the valve in different directions (it is highly desirable that there be an equal number of revolutions). After getting rid of large surface irregularities, you need to apply finishing paste and grind in until shiny. Maximum contact between valve and seat is now ensured. The main thing is to install them as they were ground in; elements cannot be swapped. In this case, it will be impossible to achieve maximum tightness.

Repair of VAZ 2109 car

The main component of the VAZ 2109 car, which requires periodic or major repairs, is the engine - the heart of the car. The reliability of transport operation depends on the condition of the unit. Therefore, do-it-yourself engine repair and maintenance for the VAZ 21099 will always be a pressing issue. To determine the type of repair, you need to identify the cause of the breakdown.

How to remove a VAZ 2109 engine without a box

Many people wonder how to remove the VAZ-2108, 2109, 21099 engine and repair it correctly. For those who do a lot of things with their own hands, I will explain, using an example with a photo, how you can remove the engine without removing the gearbox from the injection VAZ-21099. In any instructions for repairing and removing the engine from a VAZ-2108, 2109, 21099, etc. a method for removing the engine along with the gearbox is described, but it is long and very difficult, especially if there is no lift and everything has to be removed by hand. I will explain how one person can remove the engine of a VAZ-2108, 2109, 21099, etc. and without trying too hard.

We begin to remove the engine without removing the gearbox, first lift the front wheels with a jack and place a brick under them, or simply run over the bricks and secure the car with the handbrake or put something under the rear wheels to prevent the car from rolling. Since it’s summer and hot, I’ll remove the engine in the garden under the shade of a tree. After the car is installed with the front wheels on bricks, we begin to remove the engine, first drain the oil from the engine and remove the air filter, but be careful; the wires approach the filter; carefully disconnect them; in the photo the engine is already without an air filter.

The reason for removing the engine from the VAZ-21099 was the connecting rod knocking.

Photo. Engine VAZ-21099

I won’t describe in what order to remove which wire or hose, since once you decide to remove the engine, you are a good friend and can figure out the details yourself, but I will explain the main work of removing the engine.

Photo. Ignition module

Unscrew the ignition module in the photo, it is indicated by an arrow and move it to the side so that it does not interfere, unscrew the plug on the block and drain the liquid.

Photo. Disconnected hoses from head

Disconnect all the wire plugs from the head, and unscrew the hoses, unscrew the throttle cable, try to remember where everything is or write it down. But the good thing is that all the plugs are different and it is impossible to mix them up.

Photo. Unscrew the fuel line hoses

When unscrewing the fuel line hoses, be sure to use two 17mm wrenches. so as not to break the tubes, as shown in the photo. Be sure to remember which hose is located where, they should not be confused.

Photo. Unscrew the camshaft pulley

After all the wires and tubes are removed from the head, but do not remove those tubes that are directly on the head; they do not interfere and will be removed along with the head. Unscrew the muffler and camshaft pulley.

Photo. Unscrewing the head bolts

All that remains is to remove the head, it can be removed together with the camshaft, but since I came across sprocket bolts and the head does not go through and interferes with the camshaft, I had to unscrew that too, but if the bolts are hexagonal, then I remove them together with the camshaft.

How to determine a motor malfunction

The engine of a VAZ 2109 car, together with the gearbox and clutch, constitute a power unit, which makes up a single unit located on three rubber-metal elastic supports fixed in the engine compartment. Some faults can be diagnosed independently:

• Increased clearances in the assembly, very early ignition or insufficient oil pressure are indicated by a metallic, dull sound of the crankshaft main bearings.
• A large gap in the bearings or insufficient oil pressure can be indicated by a sharp knock in the connecting rod bearings.
• Replacement of pistons or piston rings will be necessary when the piston knocks, which is caused by its beating in the cylinder.
• A broken valve spring or mismatched clearances can be characterized by a uniform, constant knocking sound in the valves. To identify worn elements, you need to perform a visual inspection of the unit.
• The ingress of foreign particles under the oil pressure valve and failure of the oil pump can be determined by insufficient oil pressure at idle when the engine is warm. When using low-quality motor oil, such problems may also arise.
• Excessive pressure in the oil lubrication system indicates that the pressure relief valve is stuck or its spring is too stiff. After replacing the appropriate elements, this problem is eliminated.
• An increase in oil consumption can be caused by increased wear of piston rings, engine seals, valve stems, guide bushings, and oil seals.

Auto repair

Any of the listed malfunctions requires VAZ 2109 repairs - periodic or major.

Periodic car repairs

Regular car maintenance involves maintaining the normal operation of all components and parts of the car. In this case, the VAZ 2109 may not need major repairs for a long time, which will significantly reduce the costs of operating the car. The frequency of maintenance and repair of a VAZ 2109 car must be performed:

• Before winter and spring, the technical condition of the car is checked.
• After 15,000 kilometers, the oil and filter must be changed to clean it.
• After a run of 30,000 kilometers, the fuel filter is changed.
• Brake pads must be replaced as they wear out physically.
• Every 10,000 kilometers it is necessary to carry out diagnostics of the chassis.
• After 60,000 kilometers, the timing belt needs to be replaced.
• Spark plugs are changed every 30,000 kilometers.

This work is necessary to prevent possible malfunctions. For more serious interference with the operation of the car, you need to use the VAZ 2109 repair manual. If you follow all its basic recommendations, the car enthusiast will be able to repair the car with his own hands without much effort.

Engine overhaul

The need for major engine repairs may be indicated by:

• Instability in the operation of the unit.
• Extraneous noise.
• Tapping at the knot.
• Increased fuel consumption.
• Reduced engine power.

When performing work, the technical characteristics of the unit are restored to values ​​that correspond to the original indicators. To do this, the engine is pulled out of the VAZ 2109, disassembled, and a defect list is drawn up. All parts and assemblies are carefully examined, measured, the necessary gaps are measured, and the sequence and cost of repairs are determined. Parts that need to be restored are repaired, those that have become unusable are replaced with new ones. According to the rules, a major overhaul of the VAZ 2109 engine must be done after the car has traveled 150,000 kilometers:

• Engine repair begins with replacing rings and pistons.
• The cylinder block is bored.
• The crankshaft journal is ground.
• The starter is visually inspected.
• The serviceability of the generator and ignition distributor is determined.
• The thermostat, pump, hoses, and drive belts are replaced in the cooling system.
• The radiator is cleaned of dirt and washed.

Advice: During repairs, it is imperative to change all rubber elements.

All units are assembled in the reverse order of their disassembly.

Tip: When replacing the cylinder block, the bearing housing assemblies also need to be replaced. This is due to their joint processing.

Repair of the VAZ 2109 cylinder head requires special attention:

• The carburetor is removed from the intake pipe (see Repairing a VAZ 2109 carburetor at home).
• Its gaskets are removed.
• The carburetor heat insulating shield is removed.
• The cylinder head is removed from the car.
• The warm air intake pipe, exhaust manifold, and intake pipe are removed. The gaskets are removed.

Tip: The sealing gaskets must be removed carefully. If they are not damaged, they are reused.

• The spark plugs and coolant temperature sensor are unscrewed.
• The camshaft is pulled out.
• The tension roller and the thrust washer located under it are removed.
• The valves and stops for them are removed.
• All parts of the assembly are washed in gasoline, wiped, and dried.
• They are visually inspected and their serviceability is determined. If necessary, they are repaired or replaced with new ones.
• Assembly of the unit is performed in reverse order.

Do-it-yourself overhaul of the VAZ 21099-2109-2108 engine

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  Significant mileage is by no means a sign of the need for major repairs
• But additionally, low mileage is absolutely no guarantee that the engine is in good condition.

Read:

In this matter, the quality and frequency of related vehicle maintenance plays an important role. If the engine's oil and filters were regularly changed, and our client carried out other maintenance measures to the fullest, then such an engine will most likely last many thousands of kilometers. If routine maintenance procedures are carried out carelessly or completely ignored, then the engine of such a car may very soon need repairs.

For which the design of excessive oil consumption by the engine is intended, it is necessary to study the condition of oil seals, piston rings, and guide bushings. Before doing this, you need to make sure that oil is not being lost due to a simple leak.

• It is immediately necessary to check the compression pressure in the cylinders if you set a goal to assess the condition of the piston. You can do this procedure yourself - for this purpose you need to install a pressure gauge instead of a pressure sensor. Low pressure indicates possible wear on the hydraulic pump or bearings (or maybe both).
• Unstable engine operation, knocking, “incomprehensible” noise, loss of power, increased fuel consumption - these signs may indicate an engine overhaul, especially if several are observed at once. This, of course, is to try to tune the engine; if this does not bring results, then normal mechanical work will be required to restore the correct operation of various engine components.