Overhaul of engine: if this is hard?

In light of recent, in general, gloomy for car's relevance and popularity of used cars can greatly increase, despite the absence of a civilized market for this category of machines. By good to get used quickly. Motorist, ride on imported cars, it is unlikely peresyadet back to the domestic product with an unobtrusive quality, convenience and service. The service life of vehicles leading foreign corporations is very large, the body perfectly primed, painted and often galvanized, respectively, quite successfully resist corrosion. It is known that the most expensive parts of the car - namely the body, everything else can usually be repaired. One of the most difficult cases - overhaul the engine. It is no secret that the sale of virtually every car owner "corrects" mileage, ie, simply twisting the odometer, thus deceiving the buyer. Perhaps it makes sense to just buy a car under overhaul - will be cheaper. Immediately repaired, and after to go quietly. Signs of mechanical wear of the engine are well known - blue smoke from the exhaust pipe, the characteristic smell of burning oil. Often these symptoms are complemented by high-frequency noise of the part of the camshaft or the low frequency of the crankshaft. It also happens that the motor will not start at all. The last option is the most dangerous for the purchase. What happened to the engine - is unknown. Assurances from the seller, only yesterday that the motor starts and worked as a clock, just do not pay attention. Now in sales of used cars attempted fraud occur in 99% of cases. If a non-working power unit to the same turbocharged, must guard even more. Try spinning the motor starter. Cool? Then not so bad. If not, then you need to charge the battery, test the functionality of the starter. Again, not cool? Hence, the motor "rape" to the last, until it was jammed. You may have to replace not only the crankshaft, but broken-down engine block, but it entails "residence" block in the documents: a letter-account withdrawals, the statement in the traffic police. In general, buying a car, you can get a whole heap of problems. If the rest of the machine is ideal, it is better immediately after the purchase order contract engine in a specialized firm, although his condition and remaining life are no guarantees no one will. In general, a lottery - you are lucky, not lucky. But that is another topic. Ideal option for future repairs - blue smoke from the exhaust pipe in the absence of extraneous sounds. Such a car is likely to exploit accurately, timely changing consumables and motor oil. Probably caused by wear and tear smoke oil scraper rings and a serious backlash in the compound valve sleeve of the cylinder head. In general, we should be aware that this engine drove a lot and mechanical wear parts such as piston rings, valves, bushings, upper cylinder near top dead center, will attend a very tangible. But thanks to competent operation of the camshafts certainly "alive". Crankshaft and main and connecting rod bearings, quite possibly, in good condition and do not even have to change. But disassembled for Troubleshooting and measurements with a micrometer have everything completely. There will not consider gift instances like these, when the burst oil ring, and the rest of the powertrain in the ideal. Such cases are rare, remove the cylinder head and remove the pan much intelligence is not necessary. If you were just so, well, congratulations, but now dwell on the sequence of actions with the full repair. First - Troubleshooting. Turn off collectors - and the inlet and outlet. If the machine is modern and there is already installed Motronic with sensors and distribution, and on crankshaft, the following paragraph, you can not read. If, however, is a full-fledged distributor, attention! Remove the lid timer and put a label on the runner and casing to determine their position relative to each other. Then you need to put labels on the case again, the distributor and the cylinder head - the two provisions must be fixed, so you do not dig into the manual repair. By the way, if it is. Well, put the flywheel on the label. More tags - it is easier to collect. Valves easier rassuharivat already removed the head, so we remove cylinder head. If the drive mechanism of timing chain, then you need to assess the state of asterisks, dampers, belt tensioner and the chain itself. Perhaps they have recently changed. If not, will be visible signs of wear. Accordingly, the changes all at once: chain and sprockets, and everything else. In the case of timing belt replacement is subject to a belt and tensioner (videos). At the same time nice to see, do not play a pump, especially if it is a timing belt. After rassuharivaniya valves will be seen the state of the sleeves. If the motor worked happily, the valves in sleeves hang out for sure. Interestingly, by the way, that is often difficult to remove the valve. Why? During the work dried split groove on the rod, so the valves will either have to change to new or sanded if they are still within tolerance (which is likely, after all - hard alloy). Remove pan. When removing the cap rod is not in a hurry. Mark the position of parts relative to each other. If the main and connecting rod bushings in good condition and repair can be greatly simplified and cheaper. Remove the crankshaft would still have, not going anywhere. Need to fathom the neck for wear and ovality. Best of all it will do in a specialized workshop. Workshop should look for reviews of friends and acquaintances, rather than advertising. Some repairers to repair your pleasure and a completely new engine, the feeling that you're not in the subject. If the crankshaft in the normal ear can not be changed if there is no sign of wear. And can be replaced. Now foreign cars are manufactured standard earbuds slightly larger size - just for such cases. With the cylinder block small blood do is likely to fail. During the long operation of the ring certainly changed the geometry of the upper cylinder stuffed "barrel, wiped the factory honing. To clear the conscience of calipers can fathom the cylinders close to TDC. If the deviation is greater than 0,15 mm - bore no options. In general, the master must maintain relentless communication. Repairmen must identify themselves to develop what size pistons and rings will be ordered. Some manufacturers make repair kits under the first repair of 0,25 mm, someone just 0,5 mm. Pistons and rings usually have to order. Often possible to order neoriginala. Just remember, there's nothing special savings not worth it. It is one thing - the brand advertised, such as Kolbenschmidt or Mahle, is another - unknown manufacturer. Even if the pistons and rings at first glance look good, it is unknown how they will behave during the operation. I remember the 90's and fans poekonomit. Pistons from the Zhiguli and five-cylinder Audi engine were identical in size. Squandered the cylinder block, repairmen installed there Zhigulevskoye repair kit. The result is usually not forced to wait long - in teplonagruzhennom Audi engine piston in the cylinder nip. Next - loss of rod and a hole in the block, a well-known "Fist of friendship." If the crankshaft is not as rosy as originally wanted to, you have to polish the main and connecting rod of the cervix under repair and order the appropriate size inserts. It's not that expensive, but requires little care. Once again I call for a thorough selection of the repair shop. I remember the case when assembled and otkapitalennom engine with polished crankshaft repeatedly crank bearings. Had once again removed and Gaugeable crankshaft. Necks were ground correctly, that's just one of the employees of the studio, apparently, after grinding it dropped, which caused the change of geometry. Mechanics, of course, went into a dull failure, had to change the crankshaft on its own. To be completed.