What's so terrible about an engine overhaul?

2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:42

Overhaul of the engine - this phrase goes through every motorist to the marrow and bones. Of course, because its cost can vary from 10 to 150-200 thousand rubles, depending on the brand and model of the car. Each engine has its own resource. Having exhausted it, the mechanism needs to be repaired. What does an 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 bring all the work down the drain. And then it will be easier to handle the details, since they can be freely picked up and do whatever you want with them. After cleaning, you can get to work.

Let's start from the heart - with the pistons, since this is the most difficult and expensive part of the repair, requiring equipment and an accuracy of up to 0.01 mm. For example, a major overhaul of a VAZ engine is difficult mainly because the piston pins are inserted into the upper connecting rod head at a temperature of about 800 degrees, so this will simply be impossible to do without a certain skill and sleight of hand. Naturally,things like cylinder boring will be done by specialists. These are unavoidable expenses, just like grinding the crankshaft journals.

An overhaul of an engine takes quite a lot of time and space, so it is worth taking care of the place of work in advance and keeping it clean and tidy.

After boring the block, it indicates the class of pistons that corresponds to its size. Pistons and piston rings are selected according to it. When selecting, it is worth remembering that for all cylinders the combination of piston + connecting rod + pin + piston rings of the same 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 overhaul of the engine 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 decide whether repairs are required. Naturally, the liners need to be changed in any case. This is where the oil pump is located. 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 in mating parts is measured, this is done using the appropriate probe.

Well, that's it, the repair of the block is completed. Now we can move on to the head. Here is the gas distribution mechanism. into itincludes 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 the valve guides. In addition, you need to grind the valves. This is done with the appropriate tool and lapping paste of varying grits.

After all the procedures carried out, you should pay attention to the power system, as well as to the ignition, because if they malfunction, the engine will not respond to repairs as it should. At the very beginning, it is worthwhile to understand that do-it-yourself engine overhaul is not such a terrible thing, which almost every car owner who has the initial skills in handling equipment can do. After the completion of the repair work, it is worth remembering an equally important part - running in. During it, you do not need to subject the engine to heavy loads and exceed the speed of more than 100 km / h, since at this time all parts are lapped and heat treated.