The timing chain is the most important part in a VAZ 2107 car, so it is necessary to carefully monitor its condition. If your car has a mileage of more than 60 thousand km, you should definitely check this part to avoid possible damage in the future. It can break in one moment, which will disable the entire car, which will only be restored by lengthy and expensive repairs. Therefore, if you notice uneven operation of the engine, we recommend diagnosing the chain so that, if necessary, it can be replaced.
Design of the VAZ 2106, 2107 chain drive
To drive the VAZ 2106/2107 with a carburetor, a double-row roller chain is used. It transmits force from a sprocket mounted on the crankshaft to another sprocket mounted on the end of the camshaft. The chain is a structure that develops large inertia, so a chain drive requires vibration damping. Even if the chain is well tensioned, it retains the property of “playing” in those places where there are no sprockets or tensioners.
The chain has virtually zero ability to stretch and compress, and fairly limited flexibility. Therefore, in order to provide it with constant tension while working in its place at any speed, it has to be literally shackled, using a system of tensioners and dampers.
This problem on the VAZ 2106/2107 is solved by a damper - an additional spring-loaded clamping bar. It has a steel frame covered with a layer of durable rubber. Tensioners and dampers dampen vibration and noise quite effectively .
The chain is prevented from falling off by a stop pin that is screwed into the block or cylinder head. During normal operation the chain does not touch it.
Possible faults
In the family of cars of the Volzhsky Automobile Plant, which are called “classics”, the timing drive is made in a chain version. The service life of a good double-row chain is longer than any belt, and the chain is better protected from any external influences while being inside the engine block. Instant stretching of the chain is excluded; moreover, the chain, unlike the belt, will not slip when the engine is suddenly revved up. The downside: noise and some cumbersomeness are not so noticeable when operating the VAZ-2107.
Tensioner diagram: 1 — camshaft sprocket; 2 - timing chain; 3 — chain damper; 4 — auxiliary drive sprocket; 5 — crankshaft sprocket; 6 — tensioner shoe; 7 — hydraulic chain tensioner; 8 - oil line fitting
Unfortunately, the chain also does not last forever. It also stretches - only not immediately, but gradually, as a result of the metal fingers working against the gear teeth.
Signs that the chain has stretched and you need to diagnose the degree of its serviceability are the following:
- extraneous knocking and clanking when the engine is running;
- severe stretching and metal wear can lead to irregular valve timing, increased fuel consumption and other malfunctions.
If the chain has only slightly stretched, you can compensate for the sag by increasing the pressure with the tensioner shoe. When the limit of adjustments has been exhausted, only replacing the chain can help.
Chain stretch even of a few millimeters is noticeable to the eye
In order to better understand when you can get by with little blood and when to change the chain, the manufacturer has established the approximate resource for normal operation of the timing drive, which on the “seven” is 60 thousand kilometers. When used beyond the specified period, there is a risk of not just stretching, but the teeth jumping during operation, or the unit breaking.
Jumping the chain by one or two gear teeth leads to a violation of the valve timing, which will affect malfunctions even at idle speed, not to mention operation under load.
An open circuit leads to the disappearance of synchronization between the revolutions of the crankshaft and camshaft. As a result, the pistons, by inertia, hit the valves open inside the cylinder, deform themselves and deform them. The pistons of the “seven” engine have special grooves that protect the valves from bending. But if the engine has undergone a major overhaul with the replacement of the cylinder-piston group, the pistons may well not have recesses, then the risk of serious damage increases. Monitor the drive chain and change it on time.
Reasons for replacing the timing chain drive on a VAZ 2106, 2107
The performance and durability of the timing chain drive depends on the material and quality of heat treatment of the chain and sprockets themselves. Manufacturing accuracy and cleanliness of working surfaces are of great importance. A broken circuit is a rare occurrence. The deterioration of its condition can be monitored by increased noise when the engine is running.
For engines 2101 and 21011, where the block is lower, the number of chain links is 114, and for 2103/2106 the number of links is 116.
A method on how to replace the timing chain on a VAZ 2106 may be required when its critical wear has occurred, its resource has been exhausted, and tightening it with all sorts of “cunning” methods no longer gives results. These methods include:
- increasing the length of the working part of the tensioner by pressing on a piece of tube of a suitable diameter;
- “addition” of an additional bracket to the shoe and other “bullying” of the engine.
An extended timing chain no longer ensures accurate valve timing, which negatively affects engine performance. In addition, she wears out the shoe and constantly “beats the head off” the pacifier. In addition, engine noise increases, fuel consumption increases and engine starting becomes worse. It is also worth saying that the chain sometimes breaks with all that it entails.
To remove the timing chain, you do not need to remove the crankshaft sprocket!
For work we will need: keys “10”, “13”, “17”, a special wrench for the crankshaft pulley nut (or a head “36”), a screwdriver, a mounting blade, a hammer, and a bit.
After removing the sprocket, do not turn the drive shaft, because this may disrupt the initial ignition setting!
When to change the timing chain
The chain drive on VAZ family engines has a longer service life. The life of the chain ranges from 100 to 200 thousand kilometers .
If high-quality materials were used in the manufacture of components, and proper tension and abundant lubrication of the drive were ensured during operation, then the chain will last no less than the engine itself.
The optimal frequency for changing is every 200 thousand km.
What is timing belt?
The timing belt is the gas distribution mechanism of the engine, which controls the launch of fuel mixed with air into it and the release of burnt gases. It is based on a mechanism for opening and closing the intake and exhaust valves of cylinders driven by a cam mechanism and a camshaft. That is, the fuel-air mixture ends up in the cylinders thanks to the open intake valves, and, having burned, is removed in the form of gases through the exhaust valves. The camshafts are responsible for the actions of these valves.
To enable them to rotate, a special drive was created, operating using a chain or belt.
Timing belt - timing chain;
Valves – intake valves;
Camshafts - camshafts.
Which timing chain and tensioner should I install on the VAZ 2106, VAZ 2107?
timing chain number is 2103-1006040, the average price is 380 rubles.
Analogues:
- Fenox PC2103C3 — 519 rub.
- Kraft KT 017736 — 620 rub.
The original number of the timing chain tensioner is 2101-1006060, the average price is 364 rubles.
Analogues:
- TSN 671 — 254 rub.
- Riginal RG2101-1006060 — 230 rub.
- Trialli MT 151 — 407 rub.
Prices are current for 2021, although the cost has not changed much in three years.
Replacing the VAZ 2106 timing chain without disassembling
Replacing the timing chain without disassembling
There is a simple way to replace the timing chain of a VAZ 2106 without removing the front cover. To do this, you only need to remove the valve covers and prepare a new chain.
The principle of how to change the timing chain on a VAZ 2106 is as follows: you need to disconnect one link of the old chain, as well as one link of the new one. After this, the edges of the old and new chains must be connected by making a corresponding mark at the junction with chalk or a corrector. Then you need to take the second end of the old chain and pull it out of the mechanism, while the new chain will gradually be put on the sprockets.
When the old chain comes out completely, it must be disconnected from the new one, and carefully rivet the links of the replaced chain.
How to change the timing chain on a VAZ 2107 with an injector
Replacing the timing chain on a VAZ 2107 injector is carried out according to the same principle as on a Zhiguli 2106. Moreover, you can install a new element either in the standard way by removing the front cover, or in a simpler way.
Checking the timing chain quality
Before changing the timing chain on a VAZ-2107, you should decide on the manufacturer and quality of the chain.
The reliability of a new product can be roughly checked by taking the chain by one end and lifting it horizontally. Holding the chain edge up, its second end will bend down slightly - the smoother this bend is, the stronger and more reliable the product!
Prepare the necessary keys and be sure to put proofreader or chalk somewhere nearby.
ABOUT REPLACING A SINGLE-ROW CHAIN WITH A DOUBLE-ROW CHAIN
In early VAZ 2107 models, predominantly double-row timing chains were installed. This technical solution had its advantages:
- the distribution of mechanical load along the chain was more uniform, which significantly extended its service life. Double-row timing chains travel 100–120 thousand km, and no signs of stretching are observed in such chains;
- Double row chains are safer. If for some reason one link in such a chain fails, the chain will not break completely. This gives the driver a chance to stop the car in time after he hears the characteristic clang of a half-broken chain coming from under the hood. And timely stopping, in turn, allows you to avoid engine jamming and expensive overhauls.
The main disadvantage of the double-row chain was its heavy weight. It is for this reason that in later VAZ 2107 models they decided to abandon it. However, drivers concerned about engine safety and reliability can always return the double-row chain back. To do this, you will need to replace not only the chain itself, but also the entire tensioning mechanism, from the sprockets to the damper and tension shoe. The shoe, as you might guess, should be wider, i.e., designed for two rows of links. The shaft sprockets must also be double-rowed.
To install a double-row chain on the “seven” you will have to install special double-row sprockets
Previously, all these parts could be purchased in a single set. Nowadays, such kits are becoming increasingly rare, so drivers have to buy everything separately. Products are in great demand. This manufacturer produces not only chains, but also double-row sprockets.
Chains from are in great demand among owners of "sevens"
The sequence of installing a double-row chain on a VAZ 2107 is no different from the above. There is only one peculiarity: instead of single-row sprockets, double-row sprockets are installed. The same goes for the tension shoe. The procedure for installing a double-row chain using marks is no different from that described above.
So, the timing chain is the most important part of the engine. The consequences of failure of this part can be catastrophic. In especially severe cases, a seized engine cannot be restored at all. It is for this reason that the car owner must carefully monitor the condition of the circuit and change it at the slightest suspicion of a malfunction. Even a novice car owner can replace the chain. Despite the apparent complexity of this procedure, there is nothing terrible about it. The main thing is to correctly install the chain according to the marks, and no problems with its further operation will arise.
