How to change the damper on a VAZ 2107 carburetor

Symptoms of a chain stabilizer

A breakdown or other malfunction of the depressurizer can manifest itself in several ways:

A loud knocking sound appears in the engine. The sound comes from the front of the engine at the countershaft cover.
Engine malfunctions and malfunctions that can be caused by misalignment of the valve opening phases due to the suspension chain sliding through the actuator drive teeth.
Engine breakdown (jamming) due to strong phase displacement of timing parts and “counter” valves with pistons.

The VAZ 2107 chain gearbox most often breaks due to a weakened chain. It must be tightened regularly, as described in detail in the article “How to tighten a VAZ 2107 chain.”

The caliper is located opposite the chain tensioner shoe and is attached to the engine housing with two bolts of different lengths. Mounting nuts can break or become loose due to heavy chain vibration while the engine is running. Picky reassurance often leads to engine failure, severely worn noise during operation. In any case, to solve the problem, you need to replace the VAZ 2107.

Why does it fail

The stabilizer on the VAZ 2107 faces serious loads throughout the entire engine operating cycle. No wonder it sometimes breaks down. There may be two reasons for this:

Loosening the mounting bolts. Shocks continuously strike these bolts, causing them to become loose. Gradually becoming loose, the fastening element can easily break.
Metal destruction. The mechanism is constantly running under voltage. Continuous impacts over time lead to the appearance of microcracks that are invisible to the naked eye. Gradually some of them are increasing. There comes a time when a spare part unexpectedly breaks down.

What is needed to replace a VAZ 2107

The set of necessary tools, parts and materials is as follows:

Set of keys and end heads.
Screwdriver.
Long tweezers, magnetic telescopic handle or stiff wire hook.
Engine head cover lining.
Automotive sealant.
New VAZ chain stabilizer 2107
.

No inspection pit or lift is required to replace soot. Sufficient space and good lighting. The work can be done both in the garage and outside. In the latter case, dust on the timing element should be avoided when the cover is removed.

We check and change the timing chain on a VAZ 2106

Why do you need a timing chain and its characteristics?

Old VAZ 2106 models were equipped with a mechanical plunger tensioner, in which the rod is pushed out by a spring. In new modifications, hydraulic plungers are installed; they operate due to oil pressure. The chain must always be tensioned for correct engine operation.

Tension is carried out using a semicircular shoe, which supports the element on the left. The damper plate is also adjacent to the chain. A metal stop located on the cylinder block prevents the chain from jumping off the lower sprocket in the event of significant stretching. When the drive elements rotate, the shoe and damper press on the chain from different sides.

The timing chain drive in the VAZ 2106 power unit performs the following functions:

The number of links depends on the type of engine installed. The sixth models were equipped with power units of 1.3, 1.4 and 1.6. The piston stroke length for motors of the 1st type is 66 mm, for the other two – 80 mm. Depending on the volume of the power unit, a chain of a certain size is taken:

When purchasing a chain, it is easy to check the number of links without having to count them. Straighten the product lengthwise so that the halves fit snugly against each other. If the ends lie the same way, then the number of links is 116; in a short chain, the outermost link will be rotated at a certain angle.

Determining the need to replace the chain

The service life of the timing chain is quite long and is about 100 thousand kilometers. Over time, as the machine is used, the chain gradually stretches. In this case, the metal links are not deformed, their hinges are erased, play appears, and gaps are formed. For a small area, this development is invisible, but if you take the chain drive as a whole, the length of the part will increase significantly.

The degree of wear of the chain drive is determined by the following symptoms:

If there is a displacement of at least 1 cm, this indicates chain stretching.

A chain that has stretched more than 10 mm may jump over several links along the gears. Jumping over one section is fraught with a violation of the valve timing. In this case, the engine vibrates in any operating mode, often stalls, and its power drops significantly. Signs appear in the form of shots in the exhaust pipe or carburetor. Adjusting the ignition and fuel supply does not help eliminate vibration.

When jumping 2-4 teeth, the motor stalls and does not start again. The most unpleasant situation is when the pistons meet the valves due to a violation of the valve timing. This threatens a major engine overhaul.

Preparing for replacement: materials, tools and disassembly

During long-term operation of the power unit, not only the chain drive wears out, but also some associated elements:

The disassembly process is simple, but very labor-intensive: you have to unscrew a large number of nuts and bolts, dismantle several components and parts. Therefore, it is advisable to replace all worn-out elements, including gears. Experts recommend replacing the timing kit with a “six” and several additional elements; the set consists of the following parts:

You will need a high temperature sealant. The pulley key is often lost during repairs, and without it assembly is impossible. Therefore, it makes sense to buy a spare one, its cost is low.

Dismantling the VAZ 2107 chain support

Turn on neutral speed.
Remove the engine head cover (supported by 8 bolts). Do this carefully, being careful not to damage the gasket. if it is in good condition, it can be reused.
Set the position of the camshaft sprocket so that the mark on it coincides with the boss on the body.
Loosen the timing chain tensioner nut (just loosen, not completely unscrew).
Using a screwdriver, press down on the tensioner and release the chain tension.
While holding the screwdriver, tighten the tensioner cover nut, thereby locking it in the position when the chain is released.
Attach the tensioner by pulling it through the process hole. This will prevent the depressurizer from falling into the engine tray after the nuts are loosened. Instead of a hook, they will make long tweezers or a magnetic telescopic handle.
Remove the two mounting bolts of the VAZ 2107 and pull it out.

Chain mechanism fault detection

The timing drive, equipped with a chain, is structurally located inside the engine. To determine the condition of the parts of this mechanism, it is necessary to partially disassemble the motor. The fact that there are problems with the chain or drive elements is indicated by characteristic signs.

The chain is noisy

A circuit can have different types of noise:

noise under load;
knocking on a warm engine;
extraneous sounds when cold;
constant noise with a metallic character.

If the motor begins to make sounds that are uncharacteristic of its normal operation, it is necessary to find out as soon as possible what problems have arisen with the chain drive and eliminate them. If this is not done, wear on the timing drive elements will increase, which can lead to costly repairs.

Video: chain knocking in a VAZ “classic” engine

Timing drive components may fail prematurely for the following reasons:

the use of oil not specified by the car factory, or its untimely replacement;
use of low-quality parts;
low lubricant pressure in the engine;
failure to comply with engine maintenance regulations;
low quality of repairs.

Often the chain is noisy due to stretching or problems with the tensioner. Attempts to tighten it turn out to be useless, and the engine sounds like a diesel engine. The sound most often appears on a cold engine when idling.

The timing chain stretches over time, so it needs to be periodically tightened or replaced

With high mileage of the vehicle, the timing chain stretches. As a result, it can simply jump to other teeth of the camshaft or crankshaft gears. This problem may occur when the timing drive parts are damaged. If the chain jumps by at least one tooth, the ignition is greatly shifted and engine operation becomes unstable (sneezes, shoots, etc.). To fix the problem, you will need to check the integrity of the parts, and if damage is detected, make repairs.

Installation of VAZ 2107

Install the de-energizer in reverse order. In this case, it is necessary to tension the chain and check the positions of the engine camshaft and crankshaft labels.

Secure the muffler mounting bolts. This will prevent oil leakage.

The timing chain damper is installed on a VAZ 2107 car on the left in front of the cylinder head. The work of replacing the chain guide is shown using the example of a VAZ 2107 with a carburetor engine.

Removing the chain guide

1. We prepare the VAZ 2107 car for operations (see Preparing the VAZ 2107 car for maintenance and repair).

2. Remove the cylinder head cover (see “Cylinder head cover gasket - replacement”).

3. While holding the chain guide, use a 10 mm socket wrench to unscrew the two bolts securing the chain guide to the cylinder head.

4. Remove the timing chain stabilizer.

Installing a timing chain stabilizer on a VAZ 2107 car

Installation of all removed parts is carried out in reverse order. When installing the chain guide, pay attention to the fact that the bolt of its upper fastening is longer than the bolt of the lower fastening.

The timing chain and belt are important parts of the gas distribution mechanism. Over time, the chain stretches and requires adjustment. The article talks about when tensioning is necessary, and also gives step-by-step instructions on how to tension the chain on a VAZ 2107 with your own hands.

Purpose of the sedative

The damper is designed to dampen vibrations and jerks that occur during startup on the timing chain. Without this device, the chain would easily break off the guide gears and break at the most inopportune moments.

Most often, the timing chain breaks at the moment when the crankshaft rotation speed reaches its maximum. The break occurs so quickly that the driver has no chance to react in time and turn off the engine. As a result, all engine valves fail.

After the valves, problems begin in the cylinders. It is almost impossible to restore the engine after such a breakdown. Especially when it comes to seven. After all, the cost of repair work can significantly exceed the cost of the entire car. And it’s easier to sell a car for spare parts than to restore the engine.

Therefore, we can conclude that the timing chain guide is one of those parts that needs constant monitoring. This is the most important protection of your engine from major breakdown.

When is stretching necessary?

The gas distribution mechanism on the VAZ 2107 injector consists of the following elements:

intermediate and crankshaft gears;
camshaft and intermediate shaft;
rocker;
sedative;
intake and exhaust valve;
tensioner;
shoe;
timing chain drive.

The photo shows timing parts.

Thanks to the timing belt, the air-fuel mixture is supplied and exhaust gases are removed. Its operation is carried out using a chain drive or belt. They transmit torque from the crankshaft to the camshaft.

The shafts must be in a certain position. To do this, special marks are placed on the crankshaft pulley and the camshaft sprocket, which must be set correctly. If the marks do not match, serious problems with the engine may occur, including major engine repairs.

During operation, the chain drive and belt are under constant tension, so after a while the chain gradually stretches - its pitch increases. In this case, the engine begins to idle unstably, the speed begins to fluctuate, and the engine may stall.

Operating principle of the chain damper

When you start the engine, you force the crankshaft and timing shaft to move. Ideally they should work synchronously. But it doesn't always happen this way. The teeth on the guide gears sometimes break, and the chain stretches and begins to sag.

This leads to the fact that the timing shaft begins to move a few moments after the crankshaft. The chain stretches even more and can easily come off the gear.

That is why cars are equipped with a so-called calming system, which consists of two parts.

This is what a sedative looks like

The shoe is connected to an oil line containing an oil pressure sensor. If the chain slack reaches a high value, the lubricant pressure drops sharply. This results in an additional volume of oil being pumped in, which allows for additional pressure to be created.

The shoe moves and transmits pressure, bringing the tension state into order. All this happens instantly, which protects against circuit breaks.

But due to a sharp blow to the shoe, it begins to vibrate strongly. The vibrations are transmitted to the opposite side, where there is a damper designed to dampen them.

Step-by-step instruction

Before starting work on tensioning the chain, the car must be placed in a comfortable position. Place the gearshift knob in the neutral position and secure the wheels so that the car does not roll during the procedure.

Tools

To carry out the work, the following tools are required:

set of socket wrenches;
set of heads;
pliers;
screwdriver;
hammer.

Before starting work, you should make a visual inspection of the chain drive. If mechanical damage is found to the tension roller, shoe, guide, sprockets or chain, the defective parts must be replaced.

Stages

The sequence of work when tensioning the chain both in an engine with an injector and with a carburetor consists of the following steps:

To access the timing chain, it is necessary to remove the protective cover by unscrewing the mounting bolts that hold it in place.

If they are not set correctly, the valve timing will be disrupted. As soon as you need to exert a lot of force, you need to stop and hold the shaft from turning with a key. It is in this position that the tension will be sufficient.

Sometimes tensioning is impossible because the chain stretches over time and the plunger is no longer long enough to make the adjustment. If you do not plan to change the product, then for temporary driving you can increase the tensioner rod, for example, by attaching a bushing to the end of the rod, with which the air filter is attached. But still, a worn-out product must be replaced in the near future.

If noise occurs in the engine where the automatic tensioner is installed, then no adjustment is made, but the timing parts are replaced. The condition of the gas distribution mechanism must be constantly monitored, replacing the belt and tensioning the chain in a timely manner. It is important to check the chain tension before adjusting the valves.

The ability to change a belt and tension a chain with your own hands allows you to save time and money on visiting a car service center.

How is the replacement carried out?

In order to replace an element yourself, you need to purchase and prepare the following elements:

A new damper for your brand of car (costs about 500 rubles).
A piece of steel wire: length – 20 cm, diameter – 1.5 mm.
Open-end wrenches.
Socket wrenches and wrenches, ratchet.
Flat screwdrivers.

You need to perform the following repairs:

Remove the air purification filter. Using a 12mm wrench, unscrew the 5 bolts that secure it.
Using a 13mm socket, unscrew the bolts that secure the cylinder head cover and remove it.
Loosen the shoe fastening with a key set to “13”.
Using a flat-head screwdriver, you now need to press the shoe to the side.
Use a screwdriver to hold the shoe in this state and tighten the cap nut.
Make a hook out of wire to hold the tranquilizer. Otherwise, it will fall inside the motor.
Unscrew all the bolts that secure the damper.
Rotate the camshaft approximately 1/3 of a turn clockwise.

Next, you need to remove the damper using a wire. The new one is installed in place of the old one, and assembly is carried out in the reverse order.

Video “Chain Knocking on a Classic”

This video examines the cause of engine knocking and demonstrates chain drive tension.

A VAZ 2107 timing chain tensioner is installed on the front right side of the car engine. The main purpose of such a mechanism is to tension the chain, which in turn is extended during operation.

Replacement work is not difficult and is completed within a short period of time. To replace the tensioner you must:

Signs of a poorly adjusted chain

When they talk about a poorly adjusted chain, they usually mean a loose and sagging chain. Because a highly tensioned chain does not show any signs of breakage. She's just bursting. Here are the main signs that the timing chain has become loose:

after starting the engine, a loud grinding and knocking noise is heard from under the hood, the frequency of which increases as the crankshaft speed increases. This occurs due to the fact that the slack chain continuously hits the damper and the tension shoe;
the car reacts poorly to pressing the gas pedal: the engine begins to increase speed only one or two seconds after pressing. This is due to the fact that due to a sagging chain, the synchronism of rotation of the timing shaft and the crankshaft is disrupted;
There are power failures in engine operation. Moreover, they can occur both when accelerating and when the engine is idling. Due to the desynchronization of the shafts, which was mentioned above, the operation of the cylinders in the engine is also disrupted. In this case, one cylinder either does not work at all, or works, but not at full strength;
increase in fuel consumption. If the cylinder block is not working properly, this cannot but affect fuel consumption. It can increase by a third, and in especially severe cases - double.

What is the sequence of actions when replacing?

First, remove the cylinder head cover. This will be required in order to correctly determine the chain tension at the very end.

Remove the air filter housing from the carburetor. Then we disconnect the throttle linkage from the roller.
Then you need to remove the lever with rods.
And finally, we disconnect the fuel hose from the bracket that goes from the fuel pump to the carburetor.
Using a 10 mm tubular wrench, remove the cylinder head cover. This must be done so that you can check the chain tension by hand.
The VAZ 2107 timing chain tensioner is located on the right front side of the engine. First, using a 10mm wrench, unscrew the tensioner mounting nuts.
We take it out of the engine. There should be a gasket between the engine housing and the tensioner. Try not to damage or lose it, since a new gasket is almost always sold only complete with the tensioner. Sometimes it can start to “etch”, and in order not to purchase a kit to replace it, save the old gasket.
We fix the new automatic tensioner vertically in a bench vice. Then use a 13 mm wrench to loosen the cap nut. After this, the plunger became movable and moves freely in the tensioner body.
Now we “charge” the tensioner plunger. To do this, we place it vertically (the place where we place it is shown by a blue triangle). Then press vertically downwards with force (pressure points are shown in red). The plunger is “recessed” into the body.
Now you need to continue pressing on the body and holding the plunger “cocked” and tighten the nut back with a 13 mm open-end wrench.
Now we install the “cocked tensioner” together with the gasket into the engine housing. Using an open-end wrench 36-38 (the VAZ 2107 may have either a nut or a ratchet, so the sizes are different), turn the crankshaft clockwise by an average of one and a half to two turns. When the greatest resistance to movement arises, then the chain will be stretched to its maximum. The main thing is to ensure that the crankshaft does not turn back due to compression and that the chain tension does not weaken. If you don’t have a key for 38, you can turn on the ignition and turn the crankshaft with the starter.
We tighten the nut back, holding the crankshaft from “shock absorption” back. Then we check the tension result by pressing the chain with our hand again. There should be no deflection. Now we install the block head cover in place.
Only after the chain is tensioned should you loosen the tensioner cap nut. The plunger will release and "shoot", causing the shoe to seal tightly against the chain. At this time, a click will be heard. Only after a click does the tensioner cap nut need to be tightened tightly.

What happens if you don't install a new damper on time?

Many car enthusiasts carelessly use their car even after obvious signs of engine malfunction appear - with ringing or loss of power. There are several reasons why you shouldn't follow their example:

the engine may seize while driving;
after a more serious breakdown, repair turns out to be impractical;
You may be injured as sudden engine stops can be dangerous when traveling at high speeds or in heavy traffic.

If you do not keep track of the condition of the timing chain and its damper, then most often a sudden breakdown of these parts occurs. This sometimes happens when starting the engine or even while driving. After the damper falls apart, the timing chain breaks. Since this happens instantly, the driver does not have time to react. Therefore, valves subsequently fail, and then cylinders. The pistons will not be restored. In such a situation, the car can only be restored by replacing the engine, but for the VAZ-2107 model, repairs are not always advisable. The overwhelming majority of car owners sell their vehicles after such a breakdown for spare parts.

Source

Why is it necessary to replace the tensioner?

As the name implies, the function of the device is to tension the timing chain. Since it weakens during prolonged use, its links are stretched. In this case, unstable engine operation appears, the valve timing gradually shifts, and increased heating and wear of the cylinder-piston group parts occurs.

This is indicated by the appearance of a high-pitched ringing sound with a metallic tint from the front side of the engine, in the end part, or a knock from under the valve covers. This can be heard clearly when the engine revs up.

In this case, the chain is tensioned first, since no spare parts are needed for this. However, if it turns out to be ineffective or short-lived, then most likely the tensioner has stopped fixing the chain and needs to be replaced. The tensioner shoe may also need to be replaced.

Let's consider a simpler option for replacing the chain tensioner, which does not require replacing the shoe. Replacing the shoe requires significant preparation work, such as removing the crankcase guard, alternator belt, fan casing, crankshaft pulley, etc.