How to understand whether the time has come for the motor “H” or not yet? This, in general, is not difficult. A motor dreaming of kapitalka reports this in a variety of ways:
- - increased oil consumption;
- - difficult start;
- - smoke from the exhaust pipe;
- - when driving, the motor frankly pulls poorly;
- - every now and then the engine begins to twitch - "troit", etc .;
- - oil pressure drops;
- - Compression in the cylinders disappears.
Sometimes engine overhauls can be postponed indefinitely. We list such situations.
- Divorce for engine repair from "professionals", which can happen both on the road and in an unscrupulous car service
- For the malfunction of the mechanical part of the engine itself, shortcomings in the operation of the power supply and engine control systems, the exhaust system, the bearings of the power unit and even the automatic transmission are taken.
- Engine parameters - for example, engine oil consumption - have not yet reached critical.Still not removing the engine, but only raising the cylinder head, everyone is in a hurry to assess the condition of the working surface of the cylinders. Still not removing the engine, but only raising the cylinder head, everyone is in a hurry to assess the condition of the working surface of the cylinders.
What kind of capital is needed exactly for your motor? First, it would be necessary to carry out control measurements of everything and everything - start with the condition of the cylinders and the piston play in them, inspect the liners and measure the diameter of the crankshaft journals, evaluate the play in the fingers, etc. It would be nice, of course, to limit ourselves to replacing the piston rings, but if wear has already exceeded some limits, then this will not produce results.
With partial capital, they usually change:
- oil seals;
With full capital, the above are added:
- oil pump;
- valve bushings;
- valves themselves.
Plus, cylinder boring, head grinding and, possibly, crankshaft repair.
Prices for engine overhaul depend on the depth and quantity of work, the completeness of the restoration of parts and assemblies, as well as the complexity of the unit itself. In different regions of the country, the price also differs by more than two times. Therefore, the lower limit of the cost of rebuilding the Lada Grants engine can be called 30-40 thousand rubles. together with the cost of spare parts. At the same time, the price of a “live” contract motor is no more than 25-30 thousand rubles.
So, if you still decided on a major overhaul, contact a trusted service. And in order to minimize the risk of overpayment due to a dishonest customer who will convince you of the need for repairs that are unnecessary for you, it would be nice to understand at least the basic principles of motor capital.
Here is what it is good for every car owner to know.
Do not forget that the block has ceased to be a numbered documented part. In other words, it can be changed without problems.
Be that as it may, we must remember that cracks anywhere in the cylinder block are unacceptable. On the mirror of the cylinders there should not be deep nicks, scratches, burrs and burns - only small nods that are not felt by touch are allowed.
Next, the flatness of the mating surface under the block head is checked.
By comparing the measurements of the diameters of the cylinders and the skirts of the pistons installed in these cylinders, it is possible to determine the gap between the piston and the cylinder, which should not exceed 0.15 mm on almost all passenger car engines. If the gap exceeds this value, then you will need to bore and hon the cylinders for oversized repair pistons. In this case, the piston rings must be replaced with new, repair size.
All of the above applies to a cylinder block made of cast iron. If your engine has an aluminum cylinder block, then a special coating is sprayed on the surface of the cylinders or thin-walled cast-iron bushings are installed, which the motorists call sleeves. So, the coating, if it is peeled off, cannot be restored in any way. You have to bore holes for installing repair sleeves, in which the inner diameter will be nominal. The same applies to blocks from the factory, equipped with thin-walled cast-iron sleeves, because their wall thickness will not withstand boring for the repair size, and pistons are not always available for this engine with a repair (increased) diameter.
Cracks anywhere in the shaft are not permitted. On the main and connecting rod journals of the shaft, as well as on the surfaces mating with the working edges of the shaft oil seals, scoring, scratches, nicks and risks are not allowed.The master measures the root and connecting rod journal of the shaft. The master measures the root and connecting rod journal of the shaft.
To assess shaft wear with a micrometer, the diameters of all the main and connecting rod journals of the crankshaft are measured in two diametrically perpendicular planes.Grinding the crankshaft to a repair size. Grinding the crankshaft to a repair size.
The master must check the condition of the hydraulic pushers. When repairing the head of the block, always replace the valve stem seals. Check the valves and guide bushings for wear.
The surface of the head adjacent to the cylinder block must be flat to ensure the tightness of the gas joint, as well as the channels for the passage of oil and coolant.
Having carried out work on the restoration of the engine, the craftsmen should not lose sight of the main body of the engine oil supply - the oil pump. If its worn parts do not provide proper oil pressure, then - "hello, new kapitalka."
|A valve with such a rod made the guide sleeve unusable, so it must be replaced. A valve with such a rod made the guide sleeve unusable, so it must be replaced.||The cylinder head is ground. At the same time, a very small layer of metal was removed, which will not affect the operation of the engine. The cylinder head is ground. At the same time, a very small layer of metal was removed, which will not affect the operation of the engine.|
|Specialists must disassemble and defect the oil pump in the most careful manner. Specialists must disassemble and defect the oil pump in the most careful manner.|
And if you do not bother with all these borings and take the so-called contract motor? Could be so. Most likely, even save money. But still, you should not forget that you are not buying a new, but a used unit! As for saving - let's say, if there is a chance to cut costs by half - then you should think carefully: why is this motor so cheap? A working engine cannot be cheap.
- obligatory warming up of the engine before the trip (at least for a short time)
- driving without sudden acceleration and engine braking
- Avoid pulling, towing, overloading, etc.
All this is necessary so as not to harm the motor, which gained a second youth. How long will the engine run in? There is no exact answer and cannot be. But for 1000 km you can vouch - this is a minimum. At the same time, do not hesitate to change the engine oil and filter more often - let all sorts of chips and other muck finally be removed from the engine.