Repair of VAZ engines in Rostov-on-Don, Novocherkassk

Reasons for repair

The most basic reason to perform a major overhaul is engine wear. This is “pushed” by the significant mileage of the vehicle, operation not according to the rules, changing the oil at the wrong time, neglect of elevated temperatures. But in general there are a huge number of reasons, both internal and external, which are mainly associated with mechanical damage. All of them need to be installed.

In some cases, you can independently determine that repairs are required. This is the case with water hammer. Water hammer is a situation in which water gets inside a running engine. It penetrates very easily through the air filter, and the piston can no longer compress it.

Engine repair

But if severe wear occurs, only engine diagnostics, during which special equipment is used, will help determine whether a major overhaul is necessary. Otherwise, oil consumption that exceeds the norm and smoke from the exhaust pipe will tell us about this. It would be a good idea to check the compression in each of the cylinders.

Important! Compression measurements must be carried out on an engine that is warmed up to operating temperature. In addition, the battery must be in good working order and fully charged.

Equipment for diagnosing engine operation includes a compression meter and an endoscope.

What is needed for a major overhaul

When performing engine overhauls, attention must be paid to each engine component. To do this you will need a whole list of spare parts:

  • repair half rings;
  • generator and timing belts;
  • air and oil filter;
  • spark plugs in the required kit;
  • vacuum hose;
  • rings, pistons and pins included;
  • liners (connecting rod and main);
  • antifreeze, gearbox oil;
  • oil seals.

The list of spare parts may be expanded or shortened. This depends on the amount of work being done, the complexity of the engine repair, and the need to replace a specific spare part. In certain situations, you can avoid repairing a specific unit due to the excellent quality of the parts. It all depends on the degree of wear. This will all tell you what equipment you need to use in your work.

It is impossible to talk about the specific cost of the spare part. It will vary depending on the manufacturer, supplier and distributor. In addition, prices fluctuate depending on the market rate. For foreign cars, it is best to purchase used spare parts that will be of decent quality. The price will be almost halved.

It is worth paying attention that when carrying out repairs at a service station, craftsmen can recommend their own spare parts for installation, having their own supply network, offering a complete list. This will avoid expenses in case of necessary refurbishment. But the cost of spare parts will be slightly higher than on the market. If you purchase them yourself, there will be cases of waiting for delivery. This will also lead to payment for storing the car at the service station.

Important! Before purchasing any spare part for major repairs, you should consult with a specialist who will carry out the repair work. Since he encounters this every day, he will be able to suggest what and how best to choose. This will help avoid overfitting.

Spare parts for engine overhaul: list, description

Engine overhaul is a type of repair when the main components of the power unit are comprehensively restored and/or replaced with new ones, which allows the power unit to return operational and resource indicators as close as possible to the factory ones. In other words, overhaul involves restoring the entire engine, and not just rebuilding its individual components.

What is an engine overhaul, why and when do you need to do an engine overhaul?

Before moving on to what is needed for an engine overhaul, you need to know when and for what reasons the specified overhaul of a diesel or gasoline engine is done. Let's start with the fact that a major overhaul of the power unit includes disassembling the internal combustion engine, cleaning the propulsion system, assessing the condition, checking and troubleshooting all components. Next, the worn elements are replaced and/or repaired, depending on the degree of wear, severity of damage, etc. In some cases, the crankshaft is grinded, the cylinder block is bored or lined, work is done on the channels of the lubrication and cooling systems, the crankshaft is repaired, etc. In other cases, any operations can be avoided.

For this reason, even a qualified specialist is not able to accurately answer how much it costs to overhaul an engine without first disassembling and troubleshooting the engine. It is also often not possible at the initial stage to determine a complete list of spare parts for engine overhaul. Everything will depend on wear, the nature of possible damage and other factors. We should also not forget that overhaul may be required not only for the cylinder block and the components located in it, but also for the cylinder head with the timing belt installed in the head.

At the same time, you need to know that a “capital” is significantly different from an engine overhaul. A refurbishment usually refers to the replacement or repair of a specific failed element. More often the situation is emergency, for example, burnout of a piston or valve, scuffing in the cylinder, etc. Engine overhaul is usually done if the engine has already worn out to such an extent that its further normal operation becomes impossible or becomes very difficult without comprehensive repair and restoration work. Critical engine wear is determined by low compression in the cylinders, loss of power, increased oil and fuel consumption, smoke, and unstable operation of the internal combustion engine in different operating modes.

Each manufacturer sets a certain resource for the unit before major repairs. On average, the figure is about 150-200 thousand km. mileage The specified overhaul of a car engine is applied to modern vehicles, which are often equipped with low-volume or medium-volume highly accelerated power units.

It should also be noted that the indicated figure is greatly influenced by the quality of service, fuels and lubricants, fuel, individual operating characteristics, problems that arise and the timeliness of their elimination. In other words, the life of the motor can be either significantly increased or significantly reduced, and this depends on the maintenance and the driver himself.

This statement is quite fair; there are many examples to prove it. In practice, the same engine can run 80-100 thousand km, after which it needs an expensive “overhaul”, while another will cover 250-350 thousand km, after which in some cases not a major overhaul is done, but only surface bulkhead. Let us add that if the engine is working normally and there are no obvious reasons for disassembling it, then the unit can be safely operated, and without reference to specific numbers.

What is included in an engine overhaul?

So, a combination of certain symptoms can be considered a reason for overhaul. These include:

  • constant carbon deposits on spark plugs;
  • significant increase in oil consumption;
  • excessive fuel consumption;
  • the engine smokes blue or gray smoke;
  • low compression across cylinders;
  • a large amount of crankcase gases;
  • power loss of 15% or more;
  • knocking noises during engine operation;
  • insufficient pressure in the lubrication system;
  • motor overheating;
  • unstable operation of the unit in different modes, etc.

Once again, please note that the appearance of individual signs does not indicate the need for major repairs. In some cases, the cause may be a malfunction that can be fixed without major repairs. If the engine is worn out and the above symptoms appear comprehensively, then such a motor needs a major overhaul.

What spare parts are needed

Consider the list of spare parts for major repairs of the power unit:

  1. Piston group kit, it includes pistons, piston rings, piston pin. If the block is sleeved or such a need arises, then sleeves are purchased accordingly. When purchasing a piston group, there is no need to rush; you must first take the block to where you are going to sharpen it, and only after measuring the master will tell you what type of repair the piston needs to be purchased.
  2. It's a matter of desire; if you want, you can purchase pistons with recesses, especially useful if you are experimenting with split gears, etc. And the chain, despite its reliability, can break once every 20 years and then the meeting of the pistons with the valves is inevitable.
  3. Main and connecting rod bearings are purchased after the crankshaft has been ground. After grinding the crankshaft, the master will tell you which bearings you need to buy - 0.25, 0.50, 0.75, 1. This depends on the degree of wear of the crankshaft. It is better to take original earbuds.
  4. Oil pump. This matter is quite controversial, but I prefer to change it when conducting capital. Many people say that it can last for a very long time - I don’t take into account such stories, do it like that.
  5. Camshaft I also recommend replacing it, but if finances are really bad, you can postpone replacing it, but this is not very advisable. Although if the camshaft is in good condition, you can leave it.
  6. The intermediate shaft (drive shaft of auxiliary units, pig) is the shaft that rotates the distributor and the oil pump and is driven by a motor chain. This shaft greatly affects the pressure in the lubrication system - if the bushings are heavily worn, the oil pressure drops significantly. When overhauling an engine, the bushings must be replaced, processed with reamers, and the shaft is also either ground or replaced with a new one. There is also an intermediate shaft on ball bearings; this, in addition to increasing the service life of the industrial shaft, also allows you to increase the pressure in the lubrication system. From all this, it is necessary to take away that at the time of sending the block for grooving, you need to purchase a new one or take with you an old washer so that you can replace the bushings and grind the shaft (if you leave the old one), at least this is the case with us.
  7. If the cylinder head is also being repaired, then it is necessary to purchase valves, valve seals, and springs (if the old ones do not hold the force).
  8. I also recommend replacing the entire motor chain tensioning system, as well as the motor chain itself, this includes: crankshaft, camshaft, shaft sprockets, motor chain, motor chain tensioner shoe, motor chain tensioner, motor chain damper. Beware of fakes, there have been cases when the motor chain tensioner shoe was made of non-oil resistant rubber and it collapsed quite quickly. I try to install a plastic damper, since even if it breaks, it may not harm the engine as much as a rubber-metal one.
  9. The crankshaft seals, rear and front, must be replaced.
  10. You also need to purchase a set of gaskets, you can buy all paper gaskets separately, and buy them separately for the pan, valve cover and under the cylinder head.
  11. Also check the bearing, which includes the gearbox input shaft, at the end of the crankshaft. If there is play in the bearing, it must be replaced.
  12. If the engine knocks or the connecting rod bearing turns, then the connecting rod must be replaced.
  13. Also, do not forget about all the consumables - oil, filter, coolant.

Stages of overhaul

Engine overhaul has several stages:

  1. Preparation. The engine is removed and all its components are cleaned. The degree of engine wear, the presence of cracks and any damage to the housing are also determined.
  2. Cylinder block repair. If necessary, boring is carried out using special equipment to the required size, and the places under the crankshaft are restored. The moment when the entire oil system should be cleaned is very important. Carrying out work to repair the crankshaft involves grinding the connecting rod and main journals to the required size.
  3. Working with the cylinder head. This includes complete replacement of existing valves. If the need arises, the seat chamfers are restored, the camshaft and compensators are replaced. All existing channels are cleaned.

When assembling the engine, you need to ensure that all gaps fully comply with standards and regulations. Torque wrenches should be used that can tighten the bolts to the required level.

Cylinder block repair

Engine overhaul: what is it?

Each mechanism is designed for its own service life.
A car engine is no exception. But it is very difficult to determine the exact time when an engine overhaul is needed. Here it is necessary to take into account operating time, mileage and quality of roads or the magnitude of loads. If the car has been sitting in the garage and only a few thousand kilometers are shown on the speedometer, then it still needs to go and go. Content:

car engine

What is an engine overhaul?

All work aimed at replacing worn parts or restoring their normal condition only during complete disassembly of the engine can correspond to this type of maintenance. There are several specific reasons for this.

Reduced engine compression

The first signs of the need for restoration work on the engine is a decrease in compression. This indicates extreme wear on the piston rings and cylinder surfaces. Wear is determined by measuring the thermal gaps between the rings. An increase in the thermal gap of more than 0.6 mm will be the basis for starting work.

But the rings don't just wear out. Due to incorrectly selected oil and substandard fuel, the rings become coked and lie in their grooves. Some even break when exposed to high temperatures. The solution is to replace the rings.

The nuances of repair work

After contacting a service station, you don’t have to fold your arms and wait for the final result. Even then, there may be certain difficulties that must be dealt with. For example, the base cost for engine repairs includes boring the cylinder walls for a new piston. But depending on the degree of wear, the entire liner may need to be replaced. This will lead to the need to purchase a set of cylinders, after which they must be repressed. The same actions may occur when working with the crankshaft. The entire final result will be known after the engine is completely disassembled by specialists.

Important! You should never purchase spare parts prematurely, especially rings, pistons and bearings. The master who carries out the work will tell you all the information about them (labeling, number).

Additional equipment is used by specialists if, for example, the cylinder block is damaged. This will require processing using argon welding. In addition, grinding of the cylinder head may be required.

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