Timing marks VAZ 2104 injector 8 valves

Model features

If we turn to history, then for the first time the belt drive of the gas distribution mechanism in cars of the Volzhsky Automobile Plant began to be used on the VAZ 2105 model: an engine with such a drive was an experiment, and was not installed on all cars (some of them used a motor from the VAZ 2101 and 2103 models, having a timing chain drive).

And also, this version was the first in the Soviet era to drive the gas distribution mechanism using a belt instead of a chain, like other models. This experience can hardly be called a success, because the engine became known for its unstable operation and frequent leaks of engine oil.

But, thanks to the efforts of Soviet engineers, the mechanism is absolutely safe to use. A broken belt on a VAZ 2105 does not lead to a collision of pistons with valves, since the former have special rounded recesses on top, and this will not require engine repair.

During standard use, belt replacement in 2105 is necessary in the following cases:

The mileage is around 60 thousand km.
Damage appears on the rubber (tears, cracks).
Major engine repairs are being carried out.

Engine parameters and features

The VAZ 2105 engine is used on the VAZ 2104, 2105 and 21072 models. It has a camshaft belt drive and the following main parameters:

engine capacity 1.3 l,
power 64 horsepower,
maximum luggage compartment volume – up to 385 liters,
fuel consumption in the city – 10 liters per 100 km,
in the combined cycle - 8 liters per 100 km.

Cars based on this engine use 5W-30-15W40 oil and AI 93 fuel. The engine life, according to the factory, is 125, in practice - about 200, 4 cylinders and 2 valves, power system - carburetor, type - in-line. Torque is approximately 94 Nm at 3400 rpm. The piston stroke and cylinder diameter are 66 and 79 mm, respectively.

And also, when repairing the timing belt on the 2105, do not forget about the features of this engine. The use of a toothed belt in the gas distribution mechanism drive instead of a classic metal chain made it possible to achieve quieter operation of the machine. In addition, the belt tension has become automatic, removing an extra lubrication point, which has significantly reduced engine oil losses.

Refinement of the power system

It is best to use Weber modifications; in this case, adjusting fuel consumption for each VAZ 2105 carburetor is not so difficult. And Weber’s reliability is better. To install it, you will need a set of plumbing tools, tees, hoses and manifolds from Oka, the markings of which are in the catalog. It is worth remembering that it can be very difficult to achieve synchronous operation of carburetors. And why this happens is difficult to say. Most likely, each VAZ 2105 carburetor is unique, and therefore the fuel consumption adjustment is not ideal. So two carburetors are quite a risk. Although if everything can be set up synchronously, then the VAZ’s internal combustion engine will begin to operate very smoothly. And fuel consumption on a VAZ will increase, but by no more than 1 liter.

Considering the problematic carburetor of the VAZ 2105, the adjustment of fuel consumption of which takes a lot of time, it makes sense to switch to an injector. To do this, it is better to buy all spare parts at the official VAZ center. There is a special diagram for installation; all the work can be done in a couple of days in the garage. After this, you can forever forget about the VAZ 2105 carburetor, the adjustment of fuel consumption of which was so exhausting. However, the injector may also require initial setup.

Replacement procedure

Remove the alternator belt.
Remove the top belt cover.
Turn the crankshaft clockwise until the marks on the camshaft gear coincide with the marks on its housing, on the crankshaft pulley and the drive cover.
Remove the middle and bottom belt covers (out of a total of 3 pieces, the first was removed in step 1)
Remove spring 7, loosen bolts 3, move the bracket to the left as far as it will go and remove the belt.
Put on a new belt, press out the bracket and install spring 7.

The main condition when repairing or installing a timing belt on a VAZ 2105 will be that the installation marks match; Care should be taken to ensure that the shafts do not rotate.

Required Tool

Next, let's look at how to replace the chain and belt on the 2105. First, you need to understand the tools and accessories required to perform this operation; there are not many of them.

To replace the chain drive you will need:

Open-end and spanner wrenches (10, 13, 17);
Crankshaft pulley nut wrench (36);
Flat screwdriver;
Hammer;
New chain;

And to replace the belt you will need even fewer tools:

Open-end and spanner wrenches (10, 13, 30);
Socket wrench (17);
New belt;
Chain replacement

Having all this, you can start working. First, let's look at the chain replacement sequence. To do this, it is better to place the car on an overpass or inspection hole, and put wheel chocks under the wheels.

Tension adjustment

According to the regulations, it is required every 15 thousand km. Check the timing belt tension on this engine and adjust the tension if necessary.

To adjust the tension you need to:

Remove the timing belt cover.
Loosen bolts No. 3.
Turn the crankshaft by the hexagon of the ratchet several turns. It must be turned clockwise.
When performing the previous step, spring No. 6 will provide optimal tension automatically.
Tighten No. 3 bolts.
Put on the timing belt guard.

Frequency of replacing the timing belt on a VAZ 2105

Replacing the timing belt on a VAZ 2105 is necessary approximately every 60 thousand km during standard use, but in case of some damage it becomes necessary to replace the timing belt earlier than the standard period. Despite a certain motor resource set at the factory (in our case - 125), malfunctions occur quite often and their elimination is critical for continued use of the machine.

If folds, cracks, or fraying of the belt appear, it must be replaced, since when using a timing belt on a VAZ 2105 in this condition, there is a danger of rupture when the engine is running. When oiling, you should carefully wipe the belt with a cloth, after dipping it in gasoline.

Source

Quick replacement of timing chain and sprockets on a VAZ 2107 with an injection engine

Recently they brought us a car with a broken cylinder head gasket, and since when replacing the gasket we would have to remove the timing chain, we decided to change it along with the sprockets. We’ll talk about replacing the gasket in another article, but here we’ll look at replacing the timing chain of a VAZ 2107, as well as sprockets and a tensioner with a damper, with your own hands in an ordinary garage. In principle, the procedure is applicable to all cars of this family, because all classics were equipped with one chain motor with a slight difference in volume.

This engine is equipped with a double-row chain, which lasts a very long time; 100 thousand kilometers is not the limit for it, provided that the original Lada parts are in place. It is very simple to diagnose a stretched chain by the characteristic sound from the front of the engine; at the end of the article we will look in detail at how to diagnose and tension the timing chain.

Features of the timing chain and belt

One of the components of servicing the VAZ-2105 engine, like any other, is replacing the gas distribution mechanism drive. But the difficulty of performing this operation on this car depends on the type of drive used. Replacing a VAZ-2105 timing belt is easier than replacing a chain, but it also needs to be changed more often.

The ease of replacing the belt is one of its most positive qualities. Additionally, the belt is not so noisy, costs much less, and does not stretch very quickly.

The main disadvantage of the belt is the possibility of it breaking. And although the negative consequences of this breakage are structurally reduced by applying special grooves on the pistons, eliminating the possibility of a collision between the open valve and the piston bottom, the fact of the breakage itself remains unpleasant. In addition, the service life of the belt can be significantly reduced due to engine fluids getting into it.

The possibility of a chain break when the engine is running is practically eliminated, given the fact that the VAZ-2105 timing chain is double-row. Another positive quality of the chain is that it has a significantly longer service life than a belt.

Replacing the timing chain

We remove the throttle valve pipe, the vacuum brake booster and crankcase exhaust pipe, and the throttle cable. 10mm socket and Phillips screwdriver for clamps.
We remove the radiator by disconnecting the two pipes from it and unscrewing the two bolts located in the upper right and left corners. The head is 10. The radiator from below is inserted into the grooves in which rubber gaskets are installed, do not lose them.
Remove the valve cover by unscrewing the eight nuts by 10.

Valve cover fastening. Loosen the nut of the tension element of the generator and move it towards the cylinder block. Remove the generator V-belt. The key is 17.

Alternator belt tension.

Set top dead center (TDC)

Turn the crankshaft clockwise until the marks on the pulley and the marker on the front timing chain cover match. Key or socket 38.

Crankshaft pulley mark. The marks on the sprocket and the marker on the camshaft bearing housing should also match.

VAZ 2105 - replacing the camshaft drive chain

We replace the camshaft drive chain on a VAZ 2105 and other models from the “classic” series if it is not possible to restore the required degree of tension using the usual method using a tensioner. The verdict is clear - the chain has stretched beyond the permissible limits and needs to be replaced. The dismantling work on all types of classic engines is identical, so let’s look at the replacement process using the example of the most popular engine of the VAZ 2103 family. On an injection engine, the sequence of work is also identical with the only difference being that you will have to disconnect the block with wires from the crankshaft position sensor.

To carry out repair work, we prepare a standard set of tools, namely wrenches of different calibers from ten to seventeen, screwdrivers, pliers, etc. There is no need to drive the car into a pit for repairs. If you have everything you need, we begin the process, the sequence of actions of which is as follows:

We remove the valve cover and, turning the crankshaft as it rotates, align the marks on the camshaft sprocket with the mark on the camshaft bearing cover housing.
Next, using a flat-head screwdriver and a hammer, bend the tabs of the lock washer on the camshaft sprocket mounting bolt.
Now we need to loosen the bolt. To do this, stop the car with the parking brake and engage any gear. We just loosen the bolt without completely unscrewing it.
We remove the VAZ 2105 chain guide and the tensioner shoe. To remove all this equipment, we need to remove the front cover of the camshaft chain, unscrewing all the bolts securing it around the perimeter. A sealing gasket is installed between the cover and the block, which, regardless of its condition, must be replaced with a new one during subsequent assembly.

Loosen and completely unscrew the chain stop pin.
Next, we need to straighten the petals of the auxiliary sprocket lock washer. We use a flathead screwdriver with a long shaft and a hammer.

We unscrew the bolt securing the sprocket of the auxiliary devices. To prevent the sprocket from turning, carefully fix it with a flat screwdriver by inserting the rod between the teeth and resting the screwdriver against the cylinder block.
After the bolt is unscrewed, use a small mounting blade to pull the sprocket off the shaft.

We completely unscrew the bolt securing the camshaft sprocket and, carefully lifting the chain, remove the sprocket from the shaft.
We lower the chain down and remove it from the crankshaft sprocket, and install the camshaft sprocket itself in place, aligning the marks as they were.

After removing the camshaft sprocket, auxiliary devices, crankshaft (if required), it is strictly forbidden to turn the crankshaft, auxiliary shaft and camshaft, as this will lead to a failure of the ignition system and the car will not start during assembly.

After removing the old chain, you can begin installing the new one. The new chain is put on the auxiliary sprocket, after which the sprocket itself is installed in its place and secured with a fastening bolt (do not forget to install a new lock washer).

Prepare a long metal hook, use it to pick up the chain from above and pull it towards the camshaft sprocket. Place the chain on the sprocket. Secure the sprocket and bend the tabs of the lock washer.

All. At this point, the process of replacing the old camshaft drive chain of the VAZ 2105 can be considered complete. At the final stage, install the tensioner, tensioner shoe and chain guide and stop pin in the reverse order of removal. Check the tightness of all bolts securing system elements. Turn off the speed and parking brake and turn the crankshaft a few revolutions and check the alignment of the marks on the sprocket and the camshaft bearing cap. If the marks do not match, then it is necessary to throw the chain onto the link either forward or backward. If the installation was successful and the marks match, tighten the tensioner cap nut. Check and adjust the ignition if necessary. This completes the repair work.

Diagnostics of timing chain VAZ 2107i

Over time, the timing chain stretches, resulting in lateral vibrations in the downstream section of the chain. These vibrations can break the damper, and in extremely advanced cases, lead to the chain jumping on the sprocket and, as a result, damage to the engine. When the chain is stretched, a characteristic metallic sound appears in the front part of the engine, increase the speed a little and if the sound becomes weaker or disappears altogether, this is a clear sign of wear on the timing chain. If you have a semi-automatic tensioner installed, try tensioning the chain. The procedure is described above. If this does not help, you will have to change all elements of the gas distribution mechanism.

It is recommended to carry out the tensioning procedure every 10 km.

Timing chain drive VAZ 2107 - description

The VAZ 2107 timing chain transmission has a long service life, but someday it’s time to replace it. The need for this arises as a result of stretching of the links, when the chain tensioner can no longer cope with the functions assigned to it. In addition, the parts responsible for the normal operation of the timing drive also wear out over time.

The main elements of the VAZ 2107 timing drive are a chain, a damper, a shoe, a tensioner and sprockets

Tranquilizer

In the chain drive of the VAZ 2107 gas distribution mechanism, a damper is used to dampen jerks and vibrations of the chain. Without this part, as the vibration amplitude increases, the chain may fly off the gears or break completely. A chain transmission break is most likely at maximum crankshaft speed, which happens instantly. At the moment of a break, the intake and exhaust valves fail. After such damage, the engine will at best require a major overhaul.

The chain damper is designed to dampen vibrations of the chain drive during engine operation.

By its design, the damper is a plate made of high-carbon steel with two holes for fastening. Another element that is simultaneously responsible for calming and tensioning the chain is the shoe. Its rubbing surface is made of high-strength polymer material.

The tensioner shoe provides chain tension, eliminating sagging

Tensioner

Based on the name, you can understand that the device is designed to prevent sagging of the timing chain while the engine is running. There are several types of such mechanisms:

automatic;
mechanical;
hydraulic.

Automatic tensioners appeared not so long ago, but have already managed to show their positive and negative sides. The main advantage of the product is that there is no need to periodically adjust the chain tension, since the mechanism keeps it constantly taut. The disadvantages of the auto tensioner include quick failure, high cost, and poor tension, as evidenced by reviews from some car owners.

Hydraulic tensioners operate as a result of the action of oil under pressure, which is supplied from the engine lubrication system. This design does not require intervention from the driver in terms of adjusting the chain drive, but the mechanism can sometimes jam, which negates all its advantages.

The most common tensioner is mechanical. However, it has a significant drawback: the product becomes clogged with small particles, as a result of which the plunger jams and the mechanism is unable to perform its functions during tension adjustment.

The tensioner provides chain tension and allows for adjustments when needed.

Chain

The timing chain in the VAZ 2107 engine is designed to connect the crankshaft and camshaft: they have gears on which the chain is put. After starting the power unit, synchronous rotation of the indicated shafts is ensured through a chain transmission. If synchronization is disrupted for any reason, the timing mechanism malfunctions, resulting in the stable operation of the engine being disrupted. In such a situation, power failures, deterioration in dynamics, and increased fuel consumption are observed.

The timing chain in the VAZ 2107 engine is designed to connect the crankshaft and camshaft

As the vehicle is used, the chain stretches as high loads are placed on it. This indicates the need for periodic adjustment. Otherwise, the sagging will lead to the links on the gears jumping, which will disrupt the operation of the power unit. To prevent this from happening, the factory recommends adjusting the chain tension every 10 thousand km. mileage

Timing marks on the injection VAZ 2107

The gas distribution mechanism and its drive of the seven engine produced by the Volzhsky Automobile Plant remained the same - chain. Extraction and excessive wear of the timing chain on the VAZ 2107 power unit by the injector-type power supply system leads to:

difficulty starting the engine;

unstable operation in all modes, especially at idle;

a sharp increase in fuel consumption;

formation of carbon deposits on valve seats;

Damage to the injection control system sensors and catalytic converter may occur.

In order to avoid the negative consequences of weakening or stretching the chain drive of the VAZ 2107 car engine, it is necessary to carry out routine maintenance in a timely manner. The list of maintenance operations for the power unit with the injector power system is determined by the service book. The condition of the timing chain and the gaps between the camshaft cams and valve levers is monitored every 30 thousand km.

On warranty VAZ 2107 with an injector-type power system, such work is best carried out at an authorized auto repair center. If malfunctions occur due to the fault of the car plant, they will be eliminated at the expense of the manufacturer. At the end of this period, maintenance of the timing belt and other vehicle systems can be performed independently.

Preparation for service operations

Control of the tension of the chain drive of the gas distribution mechanism begins on an engine with a power system such as an injector or carburetor, similar to each other. The operation is performed in the sequence established by the manufacturer:

We place the car on a flat area with a hard surface and fix its spontaneous movement by installing chocks under the wheels and applying the parking brake. Set the gear shift lever to the neutral position.
Remove the cover from the cylinder head by unscrewing all the nuts along its contour using a tubular wrench. It is recommended to replace the old gasket; the use of sealants is not allowed.
Using a key set to “38”, we turn the crankshaft of the VAZ 2107 engine in order to align the marks on the moving parts and the stationary ones. Care must be taken when performing this action, and the locations of the control points should be illuminated with a flashlight or carrying device.
We combine two marks: the first is on the generator drive belt pulley with a special protrusion on the cover body, the second is on the upper sprocket of the gas distribution mechanism of the VAZ 2107 power unit with an injector power system.

With this relative arrangement of parts, the piston of the fourth cylinder is at the dead center at the top. Now you can begin performing service work on engine systems, in particular, timing belt and some others.