Why can the crankshaft oil seal squeeze out?

The crankshaft oil seal is a part that is located in the outward part of the crankshaft. As a rule, the oil seal is made of rubber or silicone and has a round shape with a hole diameter equal to the diameter of the crankshaft. Although simple in design, this part serves the important purpose of containing oil that may be expelled from the outside of the crankshaft as it rotates. Failure of the oil seal can lead to unstable engine operation and also expose the motor to serious damage. Typically, crankshaft seal failure is accompanied by several symptoms that can alert the driver to a problem that needs to be corrected.

How much does it cost to replace a rear crankshaft oil seal?

So, replacing the oil seal is the price. Depending on which one needs to be replaced, the cost also varies. For example, changing the drive sealing ring costs, on average, 1,800 rubles. But replacing the rear crankshaft oil seal will cost, on average, from 6,000 to 10,000 rubles.

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Causes of leakage

First, let's look at the reasons why it leaks from under the crankshaft oil seal. Before looking for the location of the leak, you need to figure out which specific element has failed.

A car may have two oil seals:

Front. This part is characterized by its small size and low service life. It usually breaks and leaks more often.
Rear. Typically, the service life of this part is longer. As a rule, it corresponds to the service life of the vehicle as a whole. The rear oil seal is larger than the front one.

Leaking crankshaft oil seal

Below are the reasons why it is necessary to remove and replace the oil seal:

Natural wear and tear. Car owners encounter this problem when their vehicle has driven more than 100 thousand km. Natural wear is caused by vibrations generated by the crankshaft, which contributes to the destruction of the internal component of the part. After all, the oil seal is tightly attached and adjacent to the shaft. Over the course of its service life, the device will break down and may lose its shape, causing it to move away from the surface of the assembly.
Structural destruction as a result of prolonged parking of a vehicle on the street in winter. If the car is not used, the oil seal may dry out or harden due to prolonged exposure to negative temperatures. As a result of drying, the device will not be able to fit tightly to the crankshaft.
New parts leak due to manufacturing defects. If the oil seal does not last long, the problem is the poor quality of the material used to develop it. To prevent such a problem, experts recommend not using parts from unknown manufacturers on cars.
Errors made during installation. The problem occurs when the device is unevenly mounted on the crankshaft. When installing, the oil seal is driven into the seat using a hammer with gentle blows. But it is better to use a special installation tool, this will make the process easier and will not damage the device.
Problems in the operation of the power unit. The appearance of defects in engine operation, such as an increase in crankcase gas pressure, can lead to leakage. Because of this, the oil seal is forced out. At the point where the part adheres to the crankshaft, a gap appears through which engine fluid escapes.

Visual instructions for replacing the device are provided by the KozTas channel.

How to determine the location of the leak

Our compatriots often confuse oil seal damage with oil filter failure.

Seeing traces of leaks, many car enthusiasts immediately change the oil seal without understanding the reason. As a result, there is no need to replace the oil filter. Before changing the device and eliminating traces of leakage, you need to decide which part has failed. If traces of oil appear in the rear part of the power unit, you should perform a visual diagnosis of the sump, as well as the transmission unit. Leakage can also occur in the gearbox, so drop some oil on the water. If the gearbox seal leaks, the lubricant will immediately spread across the surface of the water, and the fluid from the engine will remain on it in the form of a drop.

Signs of a leak include a lack of engine oil in the lubrication system. If you check the oil level and find that it is not enough, do not immediately add fluid. Check the motor for leaks, after which you can fix the problem.

What value should it be?

To begin with, it is worth noting that pressure is measured in bars (BAR), because we are measuring liquid. It’s unlikely that anyone will tell you the exact values now, because the structures of the engines are different, but there is a certain normal interval.

AT idle speed it is 2 BAR (or 0.2 MPa), for most cars

At 4000 - 5000 rpm - this is 4.5 - 6.5 BAR (0.45 - 0.65 MPa), also for most brands

If we take our VAZ 2112 16 valve version, then the pressure at idle is slightly higher, about 1.5 - 2.5 BAR. But at 4000 - 5000 rpm 0.4 - 0.6 BAR.

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Consequences of a leak

Let's look at the consequences that may arise as a result of operating a car with a leaking oil seal. You will learn more about the leakage of the device from the video of the Nebitanakrashen channel.

Is it possible to drive?

In addition to the need to constantly add motor fluid, the driver may face serious problems. The power unit will begin to become clogged, which will lead to further flushing, because dirt will stick to the oil. A lack of lubricant in the system will cause breakdown of the unit, as well as the main mechanisms of the motor as a whole. The timing belt will break, which can damage the valves. Ultimately, the unit will need to be overhauled. If the rear oil seal leaks, malfunctions in the transmission may occur. Sometimes the problem leads to problems with electrical equipment or controllers and sensors. The accumulation of dust on devices negatively affects their functionality.

What to do in such cases?

As mentioned above, one of the likely problems may be incorrect installation of the element. In particular, if the inner side of the rubber band is bent, then liquid can flow through it. Thus, the element only needs to be changed, despite the fact that it is relatively new.

Replacing the rear oil seal

Dismantle the gearbox (use the operating manual for your vehicle to do this).
Then take a screwdriver or any other object with a sharp tip, a regular knife will do. Remove the failed oil seal. Be careful with the work surface when doing this.
Clean the surface of the crankshaft. Please note that this can only be done with a rag. Some “craftsmen” clean the crankshaft with sandpaper. Under no circumstances should this be done, as this will cause the crankshaft to fail faster.
Install a new oil seal in place of the old one.
Install the gearbox.

Replacing the front oil seal

Remove the pulley block according to the vehicle's operating instructions.
Next, you will need to remove the timing belt cover.
Having done this, remove the rubber belt itself.
After this, remove the drive toothed pulley.
Only after this you will see the oil seal: it needs to be replaced. Do not forget about the correct installation of the element.
After replacing it, reassemble everything in reverse order.

Operating high-quality motor oil

Using a quality lubricant is the first thing you need to do after you have removed a failed oil seal. You will also need to flush the car’s internal combustion engine itself:

Locate the engine oil drain plug underneath the vehicle.
Drain the used engine fluid into a container.
Screw in the drain plug, open the hood and unscrew the filler cap.
Fill the engine with flushing fluid.
Screw on the filler cap and start the engine: you should drive it for at least 10 kilometers. The more, the better, since flushing must completely pass through the entire system and clean its components as much as possible from deposits and carbon deposits.
After this, drain the used flush and fill with new engine oil. Don't forget to change the filter.

If the problem of consumables leaking from under the crankshaft oil seal was precisely due to the use of low-quality oil, then replacing it should eliminate the problem.

How to determine the location of the leak?

Any car can use two crankshaft oil seals - front and rear. The first one fails much more often, and the service life of the second one usually corresponds to the service life of the entire car.

If traces of engine fluid are found in the rear of the engine, then you need to check the integrity of the sump and transmission module. If the transmission unit and pan are intact, then the rear oil seal must be replaced.
A lubricant leak may occur in the transmission unit. To check, you need to take the oil that is leaking and drop it into water. If the gearbox seal is worn out, the lubricant will immediately spread over the surface of the fluid. The oil from the engine should remain in the form of a drop after entering the water.

Photo gallery: crankshaft seal leak locations

Video: how to find out the cause of a crankshaft oil seal leak

The video, shot by the Alexander Mart channel, explains why the crankshaft oil seals leaked and how to determine the cause of the malfunction.

VENTILATION DESIGN FEATURES, OPERATING PRINCIPLE

The simplest diagram of the crankcase ventilation system used on internal combustion engines previously consisted of only one fitting - a breather installed in the crankcase. This breather connected the internal cavity of the cylinder block with the external environment, and crankcase gases simply escaped through it into the atmosphere. But this scheme had one significant drawback - the exhaust gases contained oil particles, which also entered the external environment. And this is not only loss of lubricant and the need for periodic refilling, but also air pollution. On modern cars the ventilation system is closed. It also has a breather, but a pipe is connected to it, allowing gases to be vented into the intake manifold or air filter housing, from where they enter the cylinders and burn. That is, the atmosphere is not polluted by them. Additionally, the system includes elements that ensure oil separation and return back to the crankcase so that it does not enter the cylinders along with the gases.

There are several options for oil separators, and on cars from different manufacturers they may differ in design and operating principle. It is worth noting that part of the exhaust gases enters the supra-valve space, and they must also be removed. Therefore, the entire circuit of the engine ventilation system on a modern car consists of a breather, an oil separator and two pipes. Additionally, a special valve can be included in the system to regulate the pressure of gases entering the intake manifold. The configuration of the system can be very different, but this does not change its purpose and operating principle. For example, consider the ventilation design of the VAZ-2110. At the bottom of the cylinder block of this car there is a breather, onto which a pipe is attached; the second end of this hose is connected through a fitting to the cylinder head cover. At the same time, an oil separator is located inside this cover at the inlet of the pipe. On its other side there is another fitting, to which a tube is connected that goes to the air inlet pipe.

The principle of operation of such ventilation is simple - gases enter the cylinder head cover space through the breather and pass through the oil separator, while the separated oil flows to the valve assembly. After this, the gases are mixed with those that have broken into the supra-valve space and are supplied to the air pipe, and then to the manifold. There is no pressure regulating valve in this car. On other machines, the oil separator may be located immediately next to the breather, and a valve is installed behind it.