With time valve stem seals VAZ 2107 lose elasticity and wear out, oil gets into the valve guides and cylinders. Signs of such a malfunction are dirty spark plugs, increased oil consumption and smoke from the exhaust pipe. In this case, the oil seals (valve seals) need to be replaced.
Why are oil seals needed and how are they designed?
Engine cylinders need protection from foreign substances entering the combustion chamber. It is the oil seals (or valve stem seals) that play the role of a kind of protector. Their task is to prevent oil from penetrating while the valve stems are operating. If the caps have lost their function, they must be replaced. Otherwise, carbon deposits will begin to appear on the walls of the engine, which will lead to increased oil consumption.
A running engine causes all elements of the gas distribution mechanism to constantly move. They rub against each other, which inevitably leads to wear. To reduce the wear rate, oil gets onto the surface of each element. In this case, you need to ensure that the oil does not end up in the working area of the valves. Otherwise, the motor will begin to malfunction. To ensure that not a drop of oil penetrates into the combustion chamber, oil seals are installed.
Valve seals have a very simple structure. They consist of only three elements:
- Base. This is the oil seal frame, which is made in the form of a steel bushing. This element ensures the strength of the spare part.
- Spring. It ensures the tightness of the mechanism by pressing the rubber tightly against the valve stem.
- Cap. This is the main element of the device, made of rubber. With its help, excess oil on the rod is eliminated.
Tools for repair
To carry out the repair you will need the following tools:
- a set of keys;
- valve puller;
- tweezers (to pull out crackers);
- oil seal remover;
- a mandrel (or something similar for pressing, for example a piece of tube slightly smaller than the diameter of the oil seal);
- hammer;
- tin solder rod 8 mm.
Signs of breakdown
To prevent serious problems in engine operation, it is necessary to promptly diagnose and correct oil seal failure.
You can judge the wear of valve stem seals on a VAZ 2107 by the following signs:
- There is an increased release of white or blue exhaust gases.
- Engine oil consumption increases significantly.
- The candles become covered with black soot.
If you find these signs of failure, you need to make sure that the entire gas distribution mechanism is working properly, and not just the caps. Pay special attention to valve diagnostics. If necessary, replace the valve stem seals on the VAZ.
If the problem is not diagnosed and corrected in time, the following consequences may occur:
- the motor will lose dynamics;
- it will begin to work unstably and will often stall at idle;
- the pressure in the cylinders will decrease;
- carbon deposits form not only on the valves, but also on the walls of the cylinders and pistons;
- the tightness of the system will be compromised.
When carbon deposits appear on the engine walls, its service life decreases sharply. If the problem is not corrected in time, the situation will lead to an expensive overhaul of the engine. But these difficulties can be avoided by simply replacing the oil seals on the VAZ 2107.
Replacement methods
There are a few basic options you have if the caps stop working properly.
| Option | Peculiarities |
| Let it be as it is | The most unfortunate decision, which can lead to serious consequences, engine breakdowns and huge restoration costs. Do not choose it under any circumstances |
| Contact a garage service station | There are many service stations created on the basis of a simple garage in an auto cooperative. Many people use their services, but we do not recommend that you do so. The prices are not as high as at a good car service center, but the quality of services is appropriate, there are no clear deadlines. Once you give the car away, you may not see it soon |
| Verified car service | A good option for those who do not want to do their own repairs and have enough money for high-quality car maintenance. There is only one disadvantage to this method of repair - high cost. |
| Do it yourself | The option preferred by most domestic car owners. Expenses will only be required for materials. With the right approach, you will make a replacement no worse than any good service station |
When choosing the option to replace the caps yourself, make sure you have sufficient experience and skills. Otherwise, doing the repairs yourself is strictly not recommended.
When is it time to replace
Over time, the sealing material of the valve stem seals becomes hard. As a result, it loses its elasticity, which leads to oil leakage into the cylinder. The same problem occurs when the piston rings are faulty.
The caps are changed in cases where oil leaks occur without visible places. Watch how the exhaust behaves while driving. Brake the car sharply with the engine, and then also sharply press the gas pedal. If this leads to the appearance of thick smoke from the muffler, then it is time to replace the seals.
Thick, bluish-colored smoke may appear on the car even after a long period of parking.
It's easy to explain. If the caps are worn out, this leads to oil entering the engine cylinder. If the piston rings are worn out or coked, the engine behaves a little differently. Smoke will remain behind the car only when driving uphill or during rapid acceleration.
If, in addition to smoke, you observe an increase in fuel consumption, a decrease in engine dynamics and problems during startup, this may all be evidence of wear and tear on the mechanisms.
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- desiccant;
- tweezers;
- oil seal remover;
- mandrel for pressing caps.
Replacing valve seals VAZ 2110 8V
Replacing the MSK is shown using the example of engine 2111 (8kl). To do this, you do not need to remove the heads from the cylinder block, but you will need a tin rod with a diameter of about 8mm (for example, solder).
We begin the procedure by removing the air filter, fuel pump, ignition distributor and auxiliary drive housing, unscrewing the bolt securing it with a 5-point hexagon. Disconnect the negative terminal from the battery. Remove the timing pulley from the camshaft, and then the cylinder head cover.
| Remove the ground wires by unscrewing the two nuts “1”. Then unscrew two nuts 2 and bolt 3 securing the rear cover of the cylinder head. Please note that there is an O-ring under the bolt head. Remove the back cover from the block head. | |
| Unscrew evenly the four nuts securing the front 1 and six nuts securing the rear 2 camshaft bearing housings and remove the washers. Then remove both housings. | |
| If the key in the camshaft groove does not fit tightly, remove it so as not to lose it. | |
| Remove the camshaft from the cylinder head. | |
| Remove the oil seal from the camshaft. | |
| Rotate the crankshaft so that the piston corresponding to the caps being replaced is at top dead center. After unscrewing the spark plug, insert a tin rod through the spark plug hole between the piston and the valve (to prevent the valve from falling down). | |
| Install the valve spring compressor as shown in the photo. In this case, use a nut without a serrated shoulder. Compress the valve spring with the tool. | |
| Use tweezers to remove two crackers. Then remove the fixture. | |
| Remove the upper spring retainer and the inner and outer valve springs. | |
| Press the oil seal onto the valve guide. | |
| To do this, install the collet of the tool for removing oil seals onto the cap. | |
| Strike the tool bushing sharply with the striker. Then just as sharply hit the striker of the handle of the device, thereby pressing the cap off the sleeve. | |
| Remove the cap from the fixture collet. If you do not have a tool for removing caps, use pliers. In this case, the force must be applied strictly upward and not rotate the caps, so as not to damage the valve guides. | |
| Before installing new valve stem seals, it is recommended to remove the springs from them, otherwise the caps can be damaged when they pass through the grooves under the cracks on the valves. | |
| Dip the valve stem seal in engine oil and insert it into the mandrel. | |
| Carefully press the cap all the way into the bottom plate. | |
| Install the spring on the cap if it was removed. Replace the remaining oil seals in the same way. | |
| Install the springs and valve plate in the reverse order of removal. Install the cotters using the tool so that they fit into the grooves of the valve stem. Remove the tin rod from the candle hole. | |
| After installing the crackers, hit the ends of the valves with a hammer through a metal rod so that the crackers sit in place. Lubricate the camshaft journals and cams, as well as the bearing surfaces under the camshaft journals in the cylinder head and bearing housings with engine oil. | |
| Install the camshaft into the cylinder head supports so that the cams of the 1st cylinder are directed away from the valve tappets. | |
| Apply sealant to the cylinder head in the area of the outer camshaft supports. | |
| Install the camshaft bearing housings, place the washers on the studs and tighten the nuts securing them in two stages in the order shown: – tighten the nuts until the bearing housings touch the surface of the cylinder head. | |
| Make sure that the guide bushings fit into the holes in the bearing housings. Finally tighten the nuts in the specified sequence. | |
How to replace caps on a VAZ 2107
- Drain approximately two liters of coolant.
- Remove the air filter housing and throttle linkage if you have a carburetor.
- Remove the valve cover.
- Place the first cylinder in top dead center mode.
- Loosen the chain tension nut.
- Remove the camshaft gear mounting bolt.
- Remove the sprocket and chain and secure them with wire to prevent a possible fall.
- Remove the bearing housing and rockers.
- Remove the candles. To prevent the valve from falling into the cylinder, be sure to plug the spark plug hole with a tin rod.
- Using a valve remover, remove the "crackers".
- Using a screwdriver, carefully pry and remove the oil seal.
- Before installing the new one, do not forget to lubricate the surface of the rod with oil.
- Replace the springs and other parts.
- Repeat all the described operations with each cylinder, installing them at TDC.
After completing all the work, return the crankshaft to its original state, install the bearing housing, camshaft gear and chain. The remaining elements are installed in reverse order.
Preparatory work
Before starting work, it is necessary to wash the engine compartment of the machine. This must be done carefully so as not to wet the sensors, pads, and elements of the ignition system. Before washing the engine compartment, you must disconnect the ground wire from the battery.
It is advisable to carry out the work in a garage - this will help to avoid dust getting on the timing parts during assembly. It is also necessary to secure the machine with the handbrake and turn on neutral speed so that you can turn the crankshaft during operation.
Replacement process
- Completely dismantle the air filter housing. Immediately remove the cover and pull out the filter, then unscrew the fastening nuts from the carburetor and remove the entire housing.
- We remove the gas pedal linkage, as well as the choke cable on the carburetor.
- We unscrew all the valve cover fastening nuts around the perimeter and remove all the spark plug wires for convenience. You can also remove the distributor cover.
To see the process of replacing valve stem seals on a VAZ 2107, see this video:
Source
Symptoms of oil seal failure
Signs that the valve stem seals need to be replaced are:
- increased oil consumption;
- smoke and soot from the exhaust pipe;
- soot on candles.
Of course, such symptoms may also indicate other malfunctions, for example, severe piston wear or stuck rings, as well as incorrectly set ignition (for carburetor models). But all this is determined experimentally. For example, measuring compression in the cylinders can help assess piston wear.
In the book on car repair and operation, it is recommended to change the valve stem seals after 30,000 km.
Causes and signs of wear on valve stem seals
The caps are continuously exposed to engine oil and exhaust gases while the engine is running. Over time, the inside of the cap becomes dull and abrasion occurs. Oil seals (valve seals) last approximately 50-100 thousand km. mileage The life of the caps is influenced by the quality of the engine oil used, as well as the frequency of replacement.
There are several main signs of cap wear:
- High consumption of engine oil (more than 1 liter per 1000 km).
- Deposits on spark plugs (simply black plugs).
- Blue smoke from the exhaust pipe (especially noticeable at high speeds).
Also, these symptoms may indicate other problems, for example, wear of the CPG in general.
Signs for repairing valve stem seals
However, this is not a panacea; there are several signs that it is time to change the valve stem seals:
- Increased oil consumption. Of course, you shouldn’t bring the engine to this state, but this situation can still arise. So, with severe wear, the oil seal becomes a filler neck, which only leads to even greater consumption. If this situation occurs, then goodbye oil after a couple of hundred kilometers. It's hard to believe, but it comes straight out of the exhaust pipe;
Blue smoke from the exhaust pipe. It is accompanied by an oil deposit at the end of the pipe;
- Black carbon deposits on spark plugs. Moreover, it should be carbon deposits, not soot.
Tools for replacing VAZ valve stem seals
In order to replace valve stem seals on a VAZ 2107, you need several special things that are on this list:
Heads or socket wrenches for 10, 13 and 17. May be needed for 14. Depends on the year of manufacture. Open-end wrench 13 for carburetor cars;
A special key for the crankshaft, because there is no ratchet on injection cars;
Depressurizer - this is the popular name for a device for desiccation of valves;
The caps themselves are sold as a set, but can also be found in bulk, you need 8 pieces;
Valve cover gasket;
Lead rod with a diameter of 8-10 mm;
