Engine overhaul - this phrase penetrates every motorist to the brain and bones. Of course, because its cost can vary from 10 to 150-200 thousand rubles, depending on the make and model of the car. Each engine has its own resource. Having exhausted it, the mechanism needs to be repaired. What does the engine overhaul mean ? Let's understand its stages.
First you need to remove the unit from the car and clean it of dirt, fuel oil, because then these accumulations can get inside and reduce all the work down the drain. And then it will be easier to handle the details, because they can be freely picked up and do anything with them. After cleaning, you can begin to work.
Let's start from the heart - with pistons, because this is the most difficult and expensive part of the repair, requiring equipment and accuracy to 0.01 mm. For example, the overhaul of a VAZ engine is complicated mainly by the fact that the piston fingers are inserted into the upper head of the connecting rod at a temperature of about 800 degrees, so without certain skill and sleight of hand it will be simply impossible to do. Naturally, things like cylinder boring will be carried out by specialists. These are unavoidable expenses, the same as grinding the necks of the crankshaft.
Overhaul of the engine takes quite a lot of time and space, so you should take care of the place of work in advance and ensure its cleanliness and order.
After the block is bored, it indicates the class of pistons that corresponds to its size. Pistons and piston rings are selected on it. When choosing, it is worth remembering that for all cylinders the combination of the piston + connecting rod + pin + pin + piston rings that is the same in weight is selected. For all cylinders, the difference should not exceed 2 grams. It is logical to assume that weighing should be carried out on the same electronic scales.
Further, the engine overhaul affects the crank mechanism, which includes the crankshaft and connecting rods. If the budget is unlimited, then the necks should be polished anyway. If there are any restrictions, then you need to take measurements and determine whether repairs are required. Naturally, the liners need to be changed in any case. At the same point is the oil pump. The fact is that its malfunction leads to a drop in pressure in the smear system, which also makes all work in vain. Here the gap is measured in the mating parts, this is done using the appropriate probe.
Well, on this, the
repair of the unit is completed. Now you can go to the head. There is a
gas distribution mechanism. It includes a valve mechanism with a camshaft. Here you need to pay attention to its condition, also take measurements and replace the valve stem seals, dressed on valve guides. In addition, you need to grind the valves. This is done using the appropriate device and lapping paste of various grain sizes.
After all the procedures carried out, it is worth paying attention to the power supply system, as well as to the ignition, because with their malfunctions the engine will not respond as much to repair as it should. At the very beginning, it is worthwhile to understand that overhauling an engine with your own hands is not such a terrible thing, which is practically possible for every car owner who has the initial skills in handling equipment. After the completion of the repair work, it is worth remembering the equally important part - the running-in. During it, it is not necessary to expose the engine to heavy loads and exceed a speed of more than 100 km / h, because at this time lapping and heat treatment of all parts occurs.