We replace the camshaft and install timing marks on a VAZ 2107 with our own hands

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.

Timing marks on a VAZ 2107 car injector

Both on the carburetor engine of the VAZ 2107 car and on the injection engine, the gas distribution mechanism along with the drive remained the same, that is, chain.
With excessive wear and stretching of the chain, a number of the following negative consequences are observed: To avoid such negative consequences, it is necessary to carry out preventive work in a timely manner. We will learn more about how to set timing marks on a VAZ 2107 Lada family car with an injector power system.

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 that is identical to each other. The operation is performed in the sequence established by the manufacturer:

1. We place the car on a level area with a hard surface and secure it to move spontaneously by installing wheel chocks and engaging the parking brake. Set the gear shift lever to the neutral position.
2. Remove the cover from the cylinder head by unscrewing all the nuts along its contour using a tubular wrench. In this case, it is recommended to change the old gasket; the use of sealants is not allowed.
3. 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. When performing this act, care must be taken, and the locations of the control points should be illuminated with a flashlight or carrying device.
4. We combine two marks: 1st - on the generator drive belt pulley with a special protrusion on the cover body, 2nd - on the upper sprocket of the gas distribution mechanism of the VAZ 2107 unit with an injector power system.

Timing phases and when to set them according to marks

Valve timing refers to those moments at which the piston in the engine moves up and down over a certain interval. When irregularities in the valve timing occur, the pistons move incorrectly along the interval, resulting in uneven engine operation on the VAZ-2107.

If the driver notices that the car’s power decreases, fuel consumption increases, and engine interruptions occur, then it is necessary to resort to setting the valve timing according to marks. How to set marks on a VAZ 2107 carburetor and injector, we will learn from this material, since the design of the timing mechanism is identical.

How to set timing timing marks

The procedure involves performing the following manipulations:

This relative arrangement of the parts allows the piston of the 4th cylinder to be positioned at top dead center TDC.

Features of servicing the timing mechanism

After the timing marks are installed on the VAZ-2107, you need to perform the following actions:

The process of adjusting the valves on the VAZ-2107 is carried out according to the following scheme: initially 6 and 8 valves are adjusted, the report must be carried out from the radiator. After they are adjusted, you need to start adjusting valves 4 and 7, then valves 1 and 3, and finally valves 2 and 5.

How to adjust the valves on a VAZ-2107 car can be found out in more detail in the relevant material on this site. In conclusion, it is worth noting that VAZ-2107 cars are one of the most reliable vehicles, the production of which began back in the 90s.

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When should you turn on the ignition?

The first thing you need to know is that there are no regulations for this operation, since the ignition timing is set or adjusted only as needed. It may be caused by the following reasons:

1. You recently acquired a “seven” on the secondary market and are trying to “bring it to mind.”
2. After repairing the engine, which included disassembling it.
3. After unscrewing or removing the head ignition distributor (distributor), regardless of the reason why it was made.
4. When switching from high-octane fuel to gasoline with a lower octane number and vice versa.
5. After replacing the contact group or bearing in the distributor (in cars with an old ignition system).

Note. On VAZ 2107 vehicles equipped with an electronically controlled injector, a prerequisite for checking the spark generation system can be the flashing of the Check Engine display on the instrument panel. True, it behaves in a similar way when a dozen more malfunctions occur. So ignition problems must first be diagnosed by contacting a service station.

In the vast majority of cases, set as a result of a violation of the settings after disassembling or repairing the engine. A separate issue is the transition to high-octane gasoline, which requires ignition with greater advance, for which adjustments are being made.

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.

Installing a new shaft

The new camshaft must be lubricated with engine oil before installation.

1. Check the lever springs. If they are broken or bent, replace them.
2. Screw the adjusting bolts into the space.
3. Install the springs, then attach the rocker to them.
4. Now you can insert the camshaft with housing. Lubricate the levers, cams and camshaft necks with oil. Fit them on and tighten them with a torque wrench. The procedure is carried out from the center to the edge. Tightening torque – 2 kgf*m.

The diagram for tightening the VAZ 2107 camshaft nuts is in the photo

Diagram of the camshaft nut tightening order

Replacing the timing chain

Alternator belt tension.

Set top dead center (TDC)

Camshaft marks.

Removing the old timing chain

Installing a new timing chain

Timing chain tension

Be sure to turn the crankshaft two turns and check that all marks match.
We install all the parts in the reverse order of removal, fill in antifreeze. We start the engine and enjoy. Everything is quite simple, replacing the timing chain on this car with your own hands is quite possible, the only condition is the presence of an inspection hole.

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.

Removing the camshaft

The engine must be cool when replacing the camshaft. You will need:

• Newest camshaft;
• Set of levers with bolts;
• Wrenches for 7, 8, 10, 13, 17 and 24;
• Small and large screwdriver;
• 3 spare lever springs;
• Rail;
• Valve cover gasket;
• Torque wrench

1. Remove the air filter, separate the tip, cable and throttle linkage.
2. If you have a carburetor engine, remove the fuel hose from the bracket; if you have an injection engine, disconnect the vacuum hose, air supply hose and remove the fuel filter from the bracket.
3. Remove the cylinder block cover.
4. Align the mark on the camshaft sprocket with the top dead center of the 4th cylinder. If you have a carburetor engine, you can turn the crankshaft with a special key. And if there is an injector, then you need to lift the cart with a jack, engage fourth gear and spin the rear wheel.
5. Remove the gasket.
6. Bend the camshaft sprocket washer with a chisel.
7. Engage fourth gear so that the crankshaft is locked.
8. Remove the tensioner.
9. Unscrew the nut and remove the star. Tie the chain to the sprocket so that the links do not jump to the other teeth.
10. Unscrew the nuts and remove the camshaft.
11. Remove the rocker, bolts and springs.

The purpose of the timing chain and its length

To understand the purpose of the timing chain, it is necessary to outline what the engines of classic VAZ models are. All these engines are overhead engines. That is, the timing shaft (aka timing) is located in the upper part of the engine, above the crankshaft and above the oil pump shaft.

All these shafts are equipped with sprockets, onto which the timing chain is placed. The chain's job is simple: it must transmit torque from the timing shaft to the crankshaft and to the oil pump shaft. From the crankshaft, torque is transmitted to the chassis, and from there to the drive wheels. They begin to rotate and the car moves forward. Thus, the timing chain is the most important connecting link between the three engine shafts, and any breakdown of this link will inevitably lead to either serious problems in the operation of the motor or to its complete jamming if the chain breaks.

Preparatory stage

To set the ignition on a VAZ 2107 , no special conditions are required; the operation can be done both in the garage and on the street, including in winter. For work, prepare the following set of tools:

• flat screwdriver;
• metal probe 0.35 mm thick;
• open-end wrench size 13 mm;
• a car light bulb designed for a voltage of 12 V with wires soldered to it;
• a wrench with a long handle designed to turn the crankshaft;
• key for unscrewing spark plugs.

Note. Instead of a special key to rotate the crankshaft, you can use a regular open-end wrench measuring 36 mm. If you don’t have such a key, then you will have to set the marks in the old proven way: by engaging 4th gear and raising the rear wheel, turn it manually, thereby turning the crankshaft.

Main elements of the timing chain tensioning system

The timing chain in the engine is supported not only by the three sprockets mentioned above. It is supported by several other important devices.

Let's look at them in more detail.

Timing chain stop pin

The timing chain in the VAZ 2107 engine is supported by a complex tensioning system. One of the elements of this system is the limiting finger. This is a small cylindrical part screwed into the wall of the cylinder block. The pin is located next to the crankshaft sprocket. The purpose of the pin is as follows: if the timing chain tension suddenly weakens, the pin will prevent the chain from jumping off the crankshaft sprocket.

At the same time, the chain will begin to touch the limiter with a characteristic ringing sound, which will certainly attract the driver’s attention, since this sound will be heard even in the cabin. If the chain breaks, the limiter will not allow it to completely fly off the sprocket and break the nearby oil pump and timing shaft sprockets. If the timing chain is tensioned normally, it does not touch the limiting pin, since in this case there is a constant gap of about 1.5 cm between it and the pin.

About timing chain tensioners

The purpose of the timing chain tensioner is easy to guess from its name. He must constantly tension the chain, preventing it from sagging. If the chain sags by even half a centimeter, it may fly off one of the sprockets (although this happens quite rarely, much more often there are situations when the chain remains on the sprocket, but at the same time jumps several teeth forward, as a result of which the uniformity of its tension is completely disrupted , and the sagging increases even more). At different times, different types of tensioners were installed on the VAZ 2107.

Mechanical tensioners

In a mechanical tensioner, the force required for the tension shoe to press on the chain is created by a conventional spring. It presses on the rod, it moves out of the body and presses on the shoe. And the shoe, in turn, puts pressure on the chain, constantly dampening its vibrations.

The spring in such a tensioner is adjusted with a conventional plunger nut. If the driver needs to tighten the chain a little, he simply tightens the nut slightly, eliminating any slack.

Automatic tensioners

Automatic tensioners were installed on later models of the VAZ 2107. Unlike mechanical devices, the design of this tensioner includes a toothed bar with a ratchet.

The plunger spring presses on this bar, and the bar transmits this force to the shoe. The ratchet prevents the bar from returning to its original position. This keeps the timing chain tension constant.

Hydraulic tensioners

These tensioners were installed in the latest VAZ 2107 models. The main difference between these devices is the principle of their operation. The force in the hydraulic tensioner is created not by a spring, but by oil pressure. It is supplied to the tensioner through a reinforced high-pressure hose.

Timing chain tensioner

The timing chain tensioner is another indispensable element of the tension system, without which uniform operation of the timing chain is impossible. The damper is a metal plate that is attached to the wall of the cylinder block.

Timing chain jump and its symptoms

The chain, like any other part of the car, wears out over time. Wear usually shows up as chain stretching. The cause of stretching is the so-called metal fatigue, which affects almost all parts that experience cyclic loads. Having stretched, the chain begins to sag significantly. If the driver does nothing, then sooner or later a situation will arise when the chain on one of the sprockets jumps one or two teeth forward. After this, all valve timing in the engine will be disrupted, as will its operation. Here are the main signs of a skipped timing chain:

All these signs indicate that the timing chain has not only weakened, but also jumped. And the driver needs to replace it as soon as possible. If this is not done, the engine will sooner or later seize, after which you will have to make expensive major repairs.

How to understand that the camshaft needs to be changed?

You can determine a camshaft malfunction without opening the hood by two signs:

• knock;
• reduction in engine oil pressure.

The main reason for malfunctions in the camshaft is the appearance of gaps. They appear between the shaft bearing journals and the bed bearings on which the camshaft rests. The cracks are formed due to the fact that parts of the camshaft are worn away. Gaps cause the shaft to move in the vertical or horizontal axis. If the shaft play is 1 mm, then this affects the operation of the engine. Reasons for the appearance of gaps:

• the camshaft was not replaced in a timely manner;
• do not change the oil on time;
• use of low-quality oil;
• the driver drives at low speeds, so little oil enters the timing belt and parts wear out faster.

Wear of the rocker in the form of a scuff Ring scuff on the main journal of the camshaft The valve stem left a ring mark

The camshaft also needs to be changed if the oil channels in it are clogged. Before changing the part, look for any play, fracture, deformation or scuffing of the shaft.

The procedure for replacing the timing chain on a VAZ 2107

Before starting the replacement, you should select all the necessary tools and consumables. We need the following things:

Sequence of operations

Since replacing the timing chain is a serious operation, it cannot be done without prior preparation. This preparation includes completely draining the coolant and removing the radiator.

About replacing a single-row chain with a double-row one

In early VAZ 2107 models, predominantly double-row timing chains were installed. This technical solution had its advantages:

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.

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.

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.

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Visual examination

You need to inspect the removed camshaft from all sides and study all its details. There should be no burrs, potholes, or aluminum leaks from the bearings anywhere. If the surface of the rockers and shaft cams resembles a washboard, this is undoubtedly wear. If, after removing the shaft from the bed, grooves are found on it - the same thing.

Ideally, you need to take the technical documentation for the car and measure all the gaps, but in most cases this will be paranoia. It is enough to listen and look to understand whether your camshaft is alive or not. Based on the visual data received, he develops a strategy and tactics for further actions.

If the shaft still needs to be replaced, any auto mechanic will advise you to simultaneously change the valve levers, called rockers. It’s worth heeding the advice: different degrees of production can lead to premature wear of the new camshaft. If you change it, then it will be as it should be.