How to replace the main oil seal with your own hands?

2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:41

When a leak occurs in the area of the seals (cuffs) of the crankshaft, the question arises of replacing them. Ignoring this breakdown can further exacerbate the problem. Oil leakage will become stronger over time, which will lead not only to the need to constantly add it, but also provoke the failure of engine parts.

Causes of breakdown

Often, the main oil seal has a working resource equal to 150 thousand kilometers. But it may happen that it will be damaged before the stated time. There are several main reasons why radial seals, whether front or rear, can be damaged: engine overheating, use of inappropriate lubricants, engine operation without timely oil and filter changes.

The use of poor quality seal parts also causes the main oil seal to leak. Regardless of the cause, cuff replacement should not be shelved. Due to the fact that the front sealing part is more susceptible to environmental influences (dirt, moisture, dust) and vibration loads, it most often fails earlier than its counterpart in the rear of the motor. But if troublehappened only with the front oil seal, then they must be changed in pairs, since their resource is the same. If damage to the seal in the pulley area can be seen visually, then the second one is a little more difficult - you can’t determine it by eye. Basically, when it wears out, you can notice the fact of slipping of the clutch. This is because oil from the crankcase gets on its elements.

Tools and fixtures

To carry out the repair process you will need:

• capacity for draining oil from the crankcase;
• rags;
• set of curly and flat screwdrivers;
• set of wrenches (ring wrenches, open-end wrenches, sockets);
• hammer and mandrels.

The entire replacement process can be done independently, following the correct sequence of technological stages of repair work. The following describes the methods for dismantling and installing new root cuffs using the example of the VAZ "nine".

Change the main front oil seal

Initially, we install the car on a viewing ditch or overpass and de-energize the on-board network by removing the negative terminal from the battery. We unscrew the drain plug from the engine pan and drain the oil. For easy access to engine parts, you can remove the front right wheel. When work is not carried out alone, in parallel, you can proceed to dismantle the generator and its drive.

Next, you need to remove the plastic protective panel of the timing belt and proceed to dismantle it, after loosening the tensioner mechanism. The oil pan also needs to be removed. Importantto say that after removing the timing belt, it is not recommended to turn the camshafts and crankshafts, as this will lead to the need to re-set the timing and ignition timing. Therefore, to prevent this, it is desirable to engage the first gear.

In the future, we dismantle the ratchet from the crankshaft - unscrew the fastening bolt and tighten it using two screwdrivers. If the ratchet key is loose on the shaft, then it is recommended to remove it too. Then we remove the oil receiver from the motor. To do this, unscrew the two bolts of its fastening to the crankshaft bearing boss and one to the oil pump. Then we dismantle the oil pump itself by unscrewing six bolts. Now we have access to the cuff. Using a powerful flat screwdriver, remove the engine main oil seal from its seat in the pump cover.

Installing a new radial seal

Immediately before installing a new part, we thoroughly rinse the cover in gasoline and wipe it with a rag. Lubricate the seat of the cuff with a thin layer of engine oil. Observing the correct location of the gland in the cover, install it in place.

Additionally, using a special mandrel, we press in the main oil seal so that it fits snugly into the technological hole. It is important not to damage the lip seal. Then it is necessary to proceed with the installation of all removed parts on the engine, observing the entire technological sequence of the process. Despite certain difficulties,You can still do it yourself at home. Of course, it is more convenient to work with a partner.

Quick change

There is another, more efficient way to replace the oil seal. But he's a little risky. The method is based on the absence of the need to remove the pan, oil receiver and oil pump. The cuff changes directly on the engine. The disadvantage of this method is the inconvenience of the work. In addition, there is a possibility that the oil seal will not be pressed enough into the oil pump cover. There is a risk of damage to the glossy coating of the crankshaft - accordingly, there is a possibility of new leaks.

Expert Tips

This kind of spare parts for VAZ should be chosen with special attention and preferably only from authorized dealers. Otherwise, you can purchase and install a low-quality part on the car, which will lead to its rapid wear. In turn, this will entail certain additional time and financial costs.

Change the main rear oil seal

Typically, posterior cuff replacement is done along with anterior cuff replacement.

As for this part of the engine, things are a little different here. Everything depends on the need to remove a large number of parts of the car. So, to access the oil seal, you first need to remove individual suspension elements, the gearbox and the clutch basket from the car. Next, you need to unscrew all the bolts securing the flywheel and remove it fromcrankshaft. Unscrewing the last fixing bolt, you need to remove the locking tire, and only then the flywheel itself.

After dismantling the rear clutch shield. We unscrew the bolts of the rear crankcase cover in the amount of eight pieces and remove it. We remove the cuff housing from the motor, for convenience, you can use a screwdriver, tucking it away from the crankcase. Now you can carefully remove the old main oil seal. It is worth noting that a large number of various covers and parts are made of aluminum alloy, so you need to treat them with care so as not to add problems in the form of buying a new part.

Installing a new seal part

Before installing a new seal, wipe the landing saddle with a rag and lubricate it with oil. Using a mandrel with a diameter of ninety-nine millimeters and a hammer, we press the new rear cuff into place.

Carry out this stage of work with extreme caution so as not to damage the element. After the main oil seal is pressed in, replacing the cuff housing gasket is the next mandatory stage of work. The old gasket is removed (if it is stuck, you can carefully cut it off with a knife), and a new one is installed in its place.

Install the stuffing box on the engine

In order not to damage the oil seal during installation, you need to apply a layer of oil on the surface of the crankshaft flange.

Mounting the seal body in its place, we correct the edge of the gland with a screwdriver so that it does not have kinks. Forplanting, you can use a mallet, but do not be too zealous with it. Next, you need to proceed with the assembly of the power unit in the reverse order of the disassembly process.

All work on the replacement of main oil seals can be considered completed.

Conclusion

As you can see, it is quite possible to repair a car with such a characteristic breakdown. To do this, you only need free time, a suitable tool and high-quality spare parts for the VAZ, without which the repair can be considered defective. It is more convenient to do the procedure with a partner. But if you don't have one, you'll be fine on your own.