Normal operation of the engine, transmission system, clutch and other components of the car is unthinkable without appropriate lubrication. This need is due to a decrease in the process of natural friction between parts. An element such as the crankshaft, the tightness of which is ensured by the crankshaft oil seal (Prior), was no exception.
Unfortunately, situations occur when the sealing element, for one reason or another, allows oil to leak, which leads to significant problems in the functionality of the vehicle systems. We will examine this problem in detail in this article.
Product Features
The part is made of specialized rubber that has a wide coefficient of wear resistance to high temperatures. Visually, the oil seal looks like a small, slightly elastic o-ring. The main and main purpose of the product is to prevent leakage of working oil. There are models on the market that differ in the quality of their workmanship and manufacturer.
Pulley, or damper, generator drive, its purpose
The multi-belt drive of the generator and other additional units, when installed on the Priora, in addition to transmitting torque from the crankshaft, performs another important job. To understand its meaning, it is worth making a short digression into the ECM.
The principle of operation of an engine with an “injector”
Cars equipped with an ECM are radically different from conventional carburetor cars. The fact is that the ECU (Electronic Control Unit) is responsible for all the actions of the ignition and fuel supply systems. It is he who gives the signals for the formation of a spark in the cylinder chambers. And it sends signals for fuel injection by opening the fuel rail injectors. The question naturally arises, how does the computer know that it is time to issue commands to turn on the necessary nodes?
The crankshaft sensor informs him of this. It is worth considering this process in more detail. This sensor operates on the long and well-known Hall effect. That is, the signal is interrupted when a special technological clearance on the disc being read coincides with the sensor. On “injection” cars, this signal coincides with TDC (Top Dead Center) of the compression stroke of the first cylinder. So, you need to know that on Russian cars it is the pulley that does the work of the information disk.
Features of the pulley (damper)
The generator drive of the Priora, like other domestic cars, is called a damper. This is a Disk with streams, along the edge of which there is a series of teeth. In one place two teeth are missing. This is the desired position of the crankshaft, and it is from this that the computer starts counting. So, from the moment this opening enters the sensor’s coverage area, the Priora ECU sends signals to open the injectors and generate a spark in the cylinders, according to the usual scheme.
The engine operates according to tables stored in the ECU memory. From this it should be clear that the pulley not only powers the generator, but also gives the command to start the engine!
Reasons for wear of the rear crankshaft oil seal on a Priora
According to experts from large auto repair shops, the most common causes of damage to the rear crankshaft oil seals are three factors:
- Untimely oil change.
- Poor quality product.
- Excessively high temperatures when the engine is running.
In the first case, the following happens: used oil contains a large number of microparticles and contaminants that can cause damage to the elements of the system and the rubber seal in particular.
The second factor is quite common due to the increased number of counterfeit automobile products. Naturally, fakes and defective products do not meet quality standards and do not have wear resistance or long-term tolerance of high operating temperatures.
The third reason is due to severe overheating of the internal combustion engine, which has a detrimental effect on the material of the sealing ring, as a result of which it may partially melt and lose its tightness.
What is the replacement frequency?
The recommended service life of the sealing element is about 140 thousand kilometers. However, such figures are approximate, since with the same mileage of several cars, their operating conditions may vary significantly.
Why are they needed in the engine?
The valves that participate in the operation of the internal combustion engine are located in it. The upper part of the part, or rather its leg, is constantly in contact with the camshaft. When it rotates, a slurry of oil is created in the cylinder head. The other part of the valve is located in the area where it is constantly in contact with the fuel mixture and exhaust gases. In order for the camshaft to operate reliably and smoothly, a large amount of lubricant is required. But it must be taken into account that lubricant entering the combustion chambers is unacceptable.
That's how engineers came up with this part. When the valve is in motion, it removes oil from the stem without allowing it to enter the combustion chamber.
Replacing the crankshaft oil seal Priora
To carry out the work you will need:
- flat screwdriver;
- set of sockets and wrenches;
"Important! Before starting repairs, the gearbox and clutch must be dismantled. In addition, mark in advance the location of the flywheel relative to the crankshaft.”
- Using a socket or wrench, unscrew the six bolts securing the flywheel. In order to prevent the latter from rotating, use a screwdriver to lock the flywheel wheel.
- After the bolts are removed, you need to remove the locking plate and pull the flywheel towards you.
- Carry out a thorough inspection of the oil seal for leaks and signs of oil leakage.
- After detecting signs of malfunction, take a screwdriver in your hand and carefully pry up the O-ring from the side of the metal sleeve. Pull the product out. "Note! Immediately after removing the product, it is recommended to inspect and test the operation of the crankshaft bearing. If its rotation is difficult or it makes unpleasant sounds, then it is advisable to replace it too.”
- Take a new crankshaft oil seal (Prior 16 valves) and lubricate the working surface of the part with engine oil.
- Place the element with the lubricated edge inward (into the cylinder block) and tuck it as tightly as possible to the crankshaft bushing.
- For a tighter and more airtight connection, you will need to use a press-fit ring (mandrel). If one is not available, a regular union head with a radius a few millimeters smaller than the sealing ring is perfect.
- Install all elements in reverse order.
Replacing the cylinder head gasket on a VAZ 2170 2171 2172 Lada Priora[edit]
If an external leak of engine oil or coolant is detected at the junction of the head and cylinder block, remove the head and replace its gasket. A leak can also occur due to warping of the block head due to overheating. In the absence of sealing on the cylinder head gasket into the internal cavities, antifreeze can get into the oil which begins to foam (foam can be seen especially clearly on the filler neck and in the cavity of the valve cover), in addition, an oil film may appear in the antifreeze. In case of this malfunction, it is necessary to replace the gasket as soon as possible, since this malfunction can lead to engine failure due to the incorrect operation of two systems at once - lubrication and cooling.
Let's sum it up
As you can see, replacing the front and rear crankshaft oil seals does not require special tools, but you will still need to do a fairly large amount of work. Remember, the procedure is responsible, since the probability of errors is quite high both when installing the seals themselves, and during the process of disassembling/assembling the engine, setting timing marks, etc.
We also recommend reading the article about what to do if an oil leak appears from under the engine oil filter. From this article you will learn about the main reasons why oil leaks at the installation site of the oil filter, as well as how to eliminate a lubricant leak at the installation site of the oil filter. For this reason, without specific experience in performing such work, it is strongly recommended that these operations be performed in specialized car repair shops. This approach will minimize the risks and undesirable consequences resulting from unprofessional installation of the seals themselves or incorrect reinstallation of elements removed from the engine after replacing the engine main oil seals.
Source
practical guide
Replacement of drive seals is carried out without removing the gearbox from the vehicle.
The oil seals of the right and left drives are not interchangeable (catalog numbers: right oil seal - 21100-2301034-00 or 21100-2301034-01; left oil seal - 21100-2301035-00 or 21100-2301035-01)
Do not remove both drives at the same time or, if necessary, install a special mandrel in place of one of them to prevent the side gears from falling out of the differential box.
Execution Sequence
1. We prepare the car for work.
Let's start to disassemble
Lada Priora Sedan 16kl Kvartsukha Logbook REPLACING THE FUEL FILTER
First, drain the oil and antifreeze. We remove the protective cover, the air filter with pipes, disconnect the ignition coil connectors, the throttle cable and the throttle assembly.
We remove the thermostat housing and simultaneously disconnect all the available connectors and pipes. We remove all the wiring that was in our way towards the battery.
We remove the generator. We unscrew the eight thirteen nuts holding the intake manifold and remove it. We unscrew all the bolts securing the valve cover, as well as the side engine support.
Unscrew the eight nuts and remove the exhaust manifold.
Remove the timing belt, camshaft pulleys and pump.
In three passes, so as not to deform the part, we first loosen and then unscrew twenty bolts of the camshaft bearing housing, the head is eight. Be sure to follow the sequence shown in the photo.
Remove the bearing housing. We remove the camshafts; there is a distinctive lip on the intake camshaft.
Also, in several passes, we first loosen and then unscrew the ten cylinder head mounting bolts. Be sure to follow the sequence shown in the photo.
Remove the cylinder head. All sixteen valves are replaced.
Consequences
Now, let’s take a look at the consequences that can arise when oil regularly leaks from under the crankshaft oil seal. The timing belt is located next to the front oil seal: if engine fluid gets on it, the belt may break faster during operation.
Installation of the front SCV
The clutch mechanism is located next to the rear oil seal, and if consumables get on it, the system will lose its friction characteristics. One way or another, in both the first and second cases, fluid leaks and engine contamination are inevitable,
There was a leak from under the front oil seal
It should be noted that a leak from under the oil pump gasket can also be confused with a leaking oil seal. These elements are located next to each other and the motor fluid in both cases will flow from one side. It is also worth adding that in this case the crankcase will be dirty, since any dirt that remains there will stick to the lubricant.
Process in detail (algorithm)
It is recommended to carry out replacement work in a pit. In this case, you must take care of safety. The car must be secured using a handbrake and wheel chocks, which must be installed on both sides of the rear wheels.
Having prepared a workplace and a set of tools, you can begin to work. To replace the gearbox seal, you need to do the following:
- Most often, the VAZ-2110 wing is closed with a rubber boot. If this part is covered in oil, this immediately indicates that the oil seal is really worn out. The boot needs to be bent. To do this, you just need to pull it by the wide part.
