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Crankshaft oil seals or seals work in rotating mechanisms and act as protective dampers. Their main task is to protect the working device from oil leakage. Thus, the oil seal is a sealing element.
Brand new cuffs
Causes of failure
Traces of oil drips are the main and main sign that indicates wear of the crankshaft oil seal. The presence of traces of oil indicates that the tightness of the engine lubrication system has been compromised.
Oil seals can be destroyed under the influence of several factors:
- Natural wear and tear, aging of the rubber used for the manufacture of crankshaft oil seals;
- Incorrect installation, which led to premature wear and loss of functionality. This usually happens during repairs at dubious service stations or when an inexperienced car owner does the replacement with his own hands;
- Mechanical damage to the element;
- Use of a defective, counterfeit oil seal.
The blame should not always be placed solely on the cuffs, which come in front and back. Before you suspect seals, make sure that other potential causes are not to blame.
Checking node status
By checking all elements of the lubrication system, you can make sure that the cause really lies in worn out, deformed oil seals. And then they can be replaced with new elements.
| Object to be checked | Peculiarities |
| Engine oil level | Oil can leave the system for various reasons, including the oil seal. Therefore, it is recommended to be patient and check the level every day, adding a little oil while actively maintaining it. The sensors do not always work correctly, so you need to make sure that there is no pressure violation yourself |
| Crankcase ventilation system | If the ventilation system is clogged, this will lead to active accumulation of crankcase gas. By creating pressure, it pushes the oil through the seals. In this case, simply replacing the cuff will not do anything, since it will be necessary to clean the ventilation |
| Oil hoses | They can bend, become deformed, or crack. As a result, oil comes out and the engine loses lubricant. |
| Lubrication system pressure | If the pressure increases, it causes oil to be pushed out through all sorts of passages. There are quite a few reasons for an increase in pressure, so check why exactly this indicator is increasing |
If problems are detected with the crankshaft seals, the only correct solution is to replace them.
How to replace the front crankshaft oil seal on a VAZ 2108-VAZ 21099?
Removal: 1) At the very beginning of the operation, remove the “Gas Distribution Mechanism” belt from all pulleys. (For information on how to remove the belt, see the article: “Replacing the timing belt”)
2) Next, using two flat-head screwdrivers, pry out the gear-type crankshaft pulley.
3) Then remove the toothed pulley from the crankshaft nose.
4) Now, using a screwdriver, pry and remove the crankshaft key so that it does not get lost when removing the oil seal.
5) Next, without removing the screwdriver, use it to pry the crankshaft oil seal and then remove the oil seal from the cover.
Installation: 1) Before installing the new oil seal, lubricate its working edge with engine oil.
2) Then press the oil seal into place using a socket, or using a piece of pipe of a suitable size, or using a mandrel.
3) After pressing, install the new oil seal in the reverse order of removal, installing a key in the groove of the crankshaft, and the crankshaft toothed pulley on the toe.
Note! When all the parts are installed, install the “Gas Distribution Mechanism” belt in its place!
Additional video clip: Below we have prepared a video clip especially for you, which describes in detail the replacement of the crankshaft oil seal, so watch and delve into it.
Source
Rear oil seal
It is necessary to replace it if an oil leak appears and lubricant gets onto the clutch discs. Because of this, clutch efficiency drops significantly or disappears completely.
Back cuff
The reason for the appearance of oil on the clutch discs may also be the front oil seal, the replacement of which we will talk about later.
To replace the rear crankshaft oil seal, follow these instructions:
- De-energize the car by disconnecting the negative terminal from the battery;
- Remove the flywheel;
- Remove the clutch housing rear shield;
- Using a socket wrench, remove the rear oil seal holder mounting bolts;
- Remove the oil seal holder, taking the sealing gasket along with it. It will be replaced when installing a new rear oil seal;
- Using a vice, clamp the holder into place. Arm yourself with a mandrel (such as a core) and press the damaged rear oil seal out of the holder;
- Clean the holder with a rag, removing all dirt. Make sure that the holder has no mechanical defects, damage, or chips. If they are, you will also have to change the holder itself;
- Having picked up a new, quality-tested oil seal, arm yourself with a mandrel that matches the diameter of the oil seal. This will allow you to press the element into place. Please note that the cuff must be mounted with the working edge inward;
- Be sure to change the rear oil seal holder gasket. This recommendation does not depend on the condition of the old gasket;
- To facilitate the process of fitting the oil seal onto the crankshaft flange, make a small chamfer around the perimeter with a needle file;
- The edge is lubricated with ordinary engine oil, like the crankshaft flange, after which the element is put on the holder;
- Using a wooden stick, straighten the edge of the cuff;
- Reassemble the structure following the reverse dismantling sequence.
Before assembly, make sure the front oil seal is in good condition. If there are signs of wear, deformation, or oil leakage, it is better to also replace it along with the rear crankshaft oil seal.
Replacing the front crankshaft oil seal on a VAZ 2108, VAZ 2109, VAZ 21099
Welcome! Today you clicked on this link not by chance, since you are looking for detailed instructions on how to replace the front crankshaft oil seal, then we will provide it to you.
The instructions for replacing the oil seal will apply only to cars of the Samara family. At the end of the article you can find a visual video that describes in detail the replacement of the crankshaft oil seal! Summary:
Where is the front crankshaft oil seal located? • It is located in the oil pump cover itself, or to be more precise, it is located on the toe of the crankshaft. In order to see it you will have to remove the timing belt cover. (You will learn how to remove the timing belt cover in this article as we proceed)
• When the cover is removed, turn your attention to the lowest crankshaft pulley, which is indicated by a red arrow in the photo. It is under this pulley that the front oil seal is located.
When should you replace the front crankshaft oil seal? It must be replaced if:
1. The appearance of various kinds of cracks, breaks and defects on it.
2. The oil seal must also be replaced when it becomes oily, that is, when oil leaks are detected on the oil seal.
Note! It is not always necessary to immediately change the oil seal when oil leaks are detected, because oil can also ooze through the oil seal for the following reasons:
How to replace crankshaft seals on a VAZ 2109 with your own hands?
Based on the types of repairs that a car enthusiast is able to perform on his own, one can judge his qualifications and experience in operating a car. If for the owner of a 9th VAZ series car, replacing the crankshaft oil seal of a VAZ 2109 does not present any difficulties, then we are dealing with a trained car owner who will not contact a car service center for every trivial breakdown.
When and why is the VAZ 2109 crankshaft oil seal replaced?
Replacing the crankshaft oil seal is a rather complicated procedure, but quite doable even in an ordinary garage that does not have special devices and professional tools.
Any car owner with some technical knowledge knows that the oil seal is designed to prevent lubricants from leaking. If a shaft or axle comes out of any mechanism containing lubricating fluid inside, then an oil seal must be installed that will not allow the lubricant to leak out. There are many components in a car where oil seals are installed, but the most important one is the engine crankshaft. The engine block of any car has a very complex lubrication system, and at the front and rear of the block, the edges of the crankshaft must protrude outward. The timing gear is attached to it at the front, and the clutch at the rear. Naturally, the lubricant should not leave the block.
The oil seal is a ring with a rigid outer ring and an elastic inner edge into which the shaft is inserted. The spring-reinforced edge compresses the shaft and does not allow oil to leak out. Since the oil seal loses elasticity or is damaged during operation, oil begins to leak and creates many problems for the driver. That is why it is important to know how to replace the crankshaft oil seal on a VAZ 2109. The procedure for changing the front and rear oil seals differs significantly due to the structural features of the engine.
Replacing the crankshaft oil seal - preparing the workplace
Full preparation for any repair work is half the success. Any car maintenance and repair work must begin with preparation, which consists of three stages:
If the goal is to replace old oil seals with new ones, you need to take care of purchasing them in advance. The front and rear oil seals are completely different in size and design. You will also need to buy new gaskets for the oil pump and rear oil seal holder. Replacing old gaskets with new ones must be made a mandatory rule for any repair of components where gaskets are present.
The tools you will need are a full set of wrenches, screwdrivers, hammers, and mandrels for installing oil seals. If a socket wrench head of “27” is suitable for the front one, then for the rear one you will have to find a metal disk or a piece of pipe with an outer diameter of 90 mm.
Replacing the front cuff
As mentioned above, replacing the front crankshaft oil seal on a VAZ 2109 is the most common and popular procedure, therefore, when carrying out repair work, it is very important to strictly follow all the recommendations of the manufacturer and be extremely careful, since the properties of the rubber from which the oil seal is made are such that it is very easy to damage during installation. There are two ways to replace the front crankshaft cuff: quick - “homemade” and recommended by the manufacturer.
First way
The method invented by the car owners themselves is as follows:
Removing the crankshaft pulley and its key
Taking out the old cuff
Installing a new oil seal
Second way
When replacing the front crankshaft oil seal on a VAZ 2109, we will need the following:
Next, you need to provide access to the engine crankcase, for which we put the car on an overpass or a lift, drain the oil and, as with any repair, disconnect the battery.
Advice! You can turn the crankshaft by turning the hanging front wheel and engaging fifth gear.
Removing the oil pump
We considered the further replacement process in the first option, but the assembly process itself occurs in the reverse order. Don’t forget to put a new gasket under the oil pump, having previously coated it with sealant (this makes it easier to install on the cylinder block).
Attention! When installing the oil pump, you must make sure that its guide pins fit into the corresponding technological holes in the engine cylinder block and that the working edge of the oil seal was not deformed during installation.
It is also advisable to install a fresh gasket under the crankcase cover.
Purpose and principle of operation
This sealing collar began to be used in the very first cars and, due to the simplicity of its design, is used in the modern automotive industry to this day. During operation, the oil seal practically does not touch the surface of the rotating surface; the gap between the parts is sealed due to the vacuum created by special notches on the end of the sealing collar.
Replacing the front crankshaft oil seal on a VAZ 2109
Replacement Guide
Before you begin, make sure you have all the necessary materials on hand. Read the instructions carefully and watch the video.
Front cuff
The front cuff is in a more convenient place than the back one and wears out faster, so let's start with it.
Tools
To change the front crankshaft oil seal of a VAZ 2109, you need standard tools that almost any car owner has:
This video shows one of the replacement methods for a VAZ 2109. It also explains what caused this malfunction.
Stages
That's it - the procedure is completed.
It is not necessary to remove the oil pump; you can change the front oil seal in place, just like the rear one!
Back cuff
The rear cuff is located in a slightly different place and to replace it we will have to work a little more.
Tools
To replace the rear oil seal, we will need almost the same tools as when replacing the front one.
Stages
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At this point, the work of changing the rear oil seal on a VAZ 2109 can be considered completed.
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Preface
Replacing the crankshaft oil seal is a rather troublesome and time-consuming process that requires certain technical knowledge. For example, a person should know, not in theory, but in practice, what parts a car consists of, how to remove the timing belt or gearbox.
Oil seals are necessary to prevent fluid, in this case engine oil, from leaking out of the engine compartment. Oil seals are installed where there is a shaft coming out of a mechanism that operates in a lubricating fluid. There are quite a few different components in the car where oil seals are installed, but the most important of them are installed in the engine.
In VAZ 2109 engines, like everywhere else, two oil seals are installed: front and rear. The rear one is usually larger; in order to get to it you need to unscrew half the car. Engine oil seals protect the engine from loss of precious engine oil; if it is insufficient, engine wear increases, which promises serious and expensive problems in the future.
An oil seal is a ring that has a rigid outer part and an elastic inside; a shaft is inserted into this ring. The outer part of this ring is reinforced by a spring, which presses it tightly against the shaft. Usually the oil seal is replaced when it is time to replace it, but there are other reasons for replacement, usually premature.
