The words "engine overhaul" for each motorist sound like a sentence, having heard that, just right to fall into despair. But is he so scary? In fact, engine overhaul can be significantly reduced, especially for expensive cars. The fact is that the engine of any car is, in fact, just iron, and, no matter how complex it may be, they are all very similar.
Everyone has
pistons, piston rings, a crankshaft. Of course, some have more valves, some have camshafts, cylinders, but they all work on the principle of four cycles, which makes them almost the same.
Overhaul of the engine of roads, first of all, with parts that, say, for German-made cars cost several times more than for brands of cars of other manufacturing countries. But do not forget that for the work of the mechanic, too, you can decently fork out.
Overhaul of the VAZ engine can be carried out in your garage, it is enough to stock up on a simple set of tools, among which there should be a gas burner, since the piston fingers are inserted into the upper heads of the connecting rod at a temperature of 750-800 degrees.
First of all, it must be taken into account that engine overhaul implies its complete disassembly, therefore, it is necessary to take care of a clean workplace in a timely manner, it is better to perform work on a removed engine without attachments. In addition, you need to stock up with a solid amount of kerosene, you will need a "bath" for the shafts, as well as for other little things.
If the engine is removed, then the work must be divided into three parts: the cylinder head, the block itself, and the lubrication system. And now - in order and in more detail.
First you need to disassemble everything into parts, but it is worth remembering that the valve mechanism, which cannot be replaced, must be installed in the same order as it stood. The valves, after replacing them and replacing the guide bushings, must be rubbed in using lapping pastes. The camshaft (or shafts, if there are two or more) should be measured with a micrometer and, if there are deviations from the norm, replaced. It is also necessary to pay attention to their supports, since they are usually made of cast aluminum (a rather soft material, which has less strength).
Now a little about the cylinder block. Here, the repair consists solely in replacement. Of course, if you have a machine for boring and honing cylinders at home, then you can do all the work yourself, but there are very few such people. Therefore, the unit itself should be returned to a specialized workshop where specialists work.
Once he returns, he will be incised with a class of pistons that are worth picking up. Each class of pistons has its own class of fingers and piston rings. The weight of the kit for each cylinder should ideally be identical, but an error of 2 grams is allowed.
Move on. Further down the list is a lubrication system. Engine overhaul also implies repair of this system, because it is it that is responsible for the safety and durability of the parts. Here, again, a micrometer is needed to determine if grinding of the crankshaft journals is required . If so, then you must do the same as with the block. If not, just replace the liners. Their size is usually indicated during repairs on the cheeks of counterweights. If the size is not specified, then the necks have never been polished, then it corresponds to the face value.
After all these operations, assembly is carried out, as well as the replacement of consumable fluids and filter elements. Before a test run, it is recommended to add oil to the oil filter and turn the crankshaft by hand. From all of the above it follows that overhauling the engine with your own hands is not so scary, since in our time it is not difficult to find any instruction manual.