VAZ 2107: replacing mufflers with your own hands

Exhaust system VAZ 2107 (carburetor)

Let's figure out what the muffler consists of. In the photo above:

pillow bolt (1)
cushion securing the muffler (2)
main muffler (3)
belt on which the muffler is suspended (4)
clamp bolt (5)
clamp securing the main muffler (muffler) to the resonator (6)
bolt of the second clamp (7)
clamp securing the resonator to the “pants” (8)
nut securing the exhaust pipe to the exhaust manifold (9)
locking plate (10)
“pants” gasket (11)
exhaust pipe (pants)(12)
resonator (13)
bolt of the clamp securing the exhaust pipe (14)
clamp securing the exhaust pipe (15)

Each owner of a VAZ 2107 car has to replace one or more parts of the exhaust system over time. The cost of replacing one spare part is not high, but you can save money by doing the job yourself. Repairs do not require special tools or special skills; an angle grinder and a “liquid wrench” (WD-40 or its equivalent) will come in handy . The figure above shows how the VAZ 2107 muffler works; replacement is the next step. For your information:

The exhaust system of the VAZ 2107 with a carburetor consists of a downpipe (pants), main and additional mufflers;
The flange of the pants on the VAZ 2107 is attached to the exhaust manifold using four studs. They are screwed with brass or copper-plated steel nuts. They are unscrewed in pairs and secured with special locking plates;
The junction of the collector with the receiving pipe is sealed with a reinforced gasket made of metal asbestos. The pants are additionally attached using a clamp to the gearbox bracket;
The VAZ 2107 resonator consists of front and rear mufflers. The front muffler pipe is put on the trousers, and the rear muffler is inserted into the main muffler pipe. At the joints they are fixed with clamps;
The main muffler is suspended from brackets on the underbody by two rubber straps and a cushion.

It is not difficult to understand which part has failed - we drive onto an overpass or inspection hole and start the engine. Usually, the muffler itself most often burns out, because it is inside it that moisture accumulates and it rots. The resonator breaks down less often because water condensation does not occur in it, since the vapors are blown into the main muffler. The service life of the exhaust pipe exceeds the service life of other parts of the exhaust system by several times.

Attention: Any work related to the replacement or repair of the exhaust system must be carried out only after waiting for all its parts to cool completely.

List of tools:

Key 13 (rozhkovo - cap);
Driver or ratchet;
Heads for 10 and 13 (deep);
Wide flathead screwdriver or chisel;
Hammer;
Pliers.

Necessary tool

Exhaust System Mounting Parts

A clear understanding of the algorithm of actions when carrying out such an event as replacing a VAZ 2107 muffler will help every car enthusiast carry out his plans quickly and without errors. On the one hand, removing the old muffler and installing a new one seems simple, but on the other hand, you need to be prepared for some difficulties.

Why and how often is it necessary to change the VAZ 2107 muffler?

The exhaust system of a car, despite its relatively simple design, performs many functions. The main ones are:

removal of fuel combustion products;
significant reduction in exhaust sound level;
maintaining air balance with the intake system;
ensuring effective cleaning and ventilation of cylinders.

The VAZ 2107 muffler experiences enormous loads like no other part of the car. First of all, constant temperature changes have a destructive effect on the metal, which actively destroys not only the protective paint and varnish coatings, but also the structure of the metal itself.

Gases heated to a high temperature literally “eat up” the internal filling of the muffler, mixing with water condensate and oils, dissolving the metal walls, forming through corrosion. Externally, the muffler elements are also adversely affected by moisture, road sand and gravel; salt solutions in winter intensify the decomposition process.

As a result, after some time the driver can observe under the bottom of the car the pitiful remains of what was once called a muffler. Whether we like it or not, the muffler of a VAZ 21074 or any other model will have to be changed periodically. To the question of how often you should change the muffler, every car enthusiast must find the answer himself.

The service life of an exhaust system, like many others, depends on factors such as:

activity of vehicle operation;
quality of fuel used;
the car owner’s attitude towards the condition of the car;
frequency of use of the machine in adverse weather conditions;
quality of previously installed exhaust system parts.

Having come to terms with the fact that the VAZ 2107 muffler will not last forever, you need to buy a new one and start replacing it.

Replacing the VAZ 2107 muffler - procedure

An inherently simple procedure can take a lot of effort and time. Before installing a new muffler, you must remove the old one. To do this you should:

install the car on an overpass or above an inspection hole;
prepare a set of tools, ensure good lighting under the machine;
The muffler is connected by a pipe to the resonator pipe in front of the rear axle. The ends of pipes with a slot and a male-female connection are tightened from the outside with a coupling;
Corrosion under the influence of lubricant and temperature can solder the joints so much that it becomes very difficult to remove them. It is better to moisten the pipes at the junction and the coupling in advance with a solution that corrodes corrosion. For this purpose, as a last resort, brake fluid or used oil is suitable.

The procedure for replacing the muffler is as follows:

the crimp coupling is untwisted or cut off using a cutting tool (grinder) (in this case, a new coupling should be on hand);
use a thin chisel or screwdriver to bend the flared edges of the pipe;
the muffler is disconnected from the resonator (if it comes out tight, you can help yourself with a hammer by tapping on the pipe);
hanging pillows are detachable. By the way, when buying a muffler, it is advisable to buy three suspension rubber bands (two in the center and one at the rear).

After this, the old muffler is in your hands and you can install the new one in the reverse order.

How to replace the muffler of a VAZ 21074 and other modifications of classics

Very often, car enthusiasts, seeing in the title of the article that the make of the car does not exactly match what is indicated in the registration certificate, continue to search for instructions. VAZ cars are charming because they differ from each other for the most part only in appearance, but the internal structure is completely identical.

It doesn’t matter what kind of car is in the garage: 2105, 2104, 2107 or 21074 - their exhaust system is completely the same. Having studied the repair instructions for one car, you can safely begin repairing another classic model.

Malfunctions

Any driver experiences an unpleasant feeling when the clutch pedal sinks to the floor. This can happen if the clutch cable breaks; it is also possible that the release fork breaks (this case is discussed in another article). The cable breaks more often on older cars that are used in extreme conditions or all year round.

The cable may become frayed, which affects the smoothness of the pedal and the operation of the clutch. This cable also requires replacement.

If the clutch cable is broken, you can drive your car to the repair site. You need to start the car in first gear and shift while driving. The following situation is possible: the cable broke while the gear was engaged, and the car stalled.

There is a possibility that it will be difficult to engage the neutral position. Then your car won’t even be able to roll off the roadway. The transmission is disengaged by rocking the car forward and backward and disengaging the transmission at the same time. You can jack up one of the wheels and spin it by hand, this will also help.

Even if the cable is not replaced, gear shifting is possible. It is possible to get to the service station, but such driving has a negative impact on the service life of the gearbox.

The cost of the spare part is low, about 300 rubles. The cost of replacing a cable in a car service is 400 rubles.

How much does it cost to hand over a VAZ 2107 catalyst?

The ability of Russian people to effectively transform unnecessary waste into quite good income is amazing. The business of collecting used automobile catalysts, which brings significant dividends, is a prime example of this!

Catalysts in modern cars contain a certain amount of precious metals. To a greater extent it is Platinum or Palladium. Rhodium is less common.

The cost of metals used in catalysts for purifying exhaust gases today reaches 3,500 rubles per gram, while one unit can contain from 1 to 8 grams of Platinum, or another noble alloy.

The main business associated with the purchase of used catalysts from the population lies precisely in the removal of precious metals from vehicle waste.

Even an ordinary motorist can hand over a used device and receive from 1,000 to 18,000 rubles for it.

How to do it? Read below and then perhaps you can make good money by collecting autocatalysts containing platinum.

What catalysts do you buy?

They buy automobile catalysts of both domestic and foreign production.

Accepts metal and ceramic.

Foreign copies are accepted both in whole and disassembled condition.

Domestic, only disassembled.

How much do catalysts cost?

The cost of filters for purifying exhaust gases of a foreign-made car can be determined by the serial number of the product.

The most expensive specimens can be valued at 15,000 - 20,000 rubles per piece up to 45,000 rubles per kg.

Domestic catalysts are bought from 800 rubles to 4000 rubles per piece.

How the price is formed.

The cost of the catalyst at collection points (they are accepted mainly by weight) directly depends on the content of precious metals in them.

If 1 kg contains 6 grams of platinum, then the price will accordingly be based on the cost of 6 grams of platinum. The fewer precious metals there are in a kilogram of catalyst, the correspondingly cheaper it is.

How do you find out how much platinum is in the catalyst?

A disassembled catalyst is taken (only models in exceptional condition are not disassembled).

All filter mass is removed.

Afterwards, using a special device, X-ray fluorescence analysis is carried out, the purpose of which is to determine the exact amount and mass of precious metals in the catalyst.

XRF spectrometer for checking the content of precious metals

Next, the cost of the precious metal on the world market is clarified, a commission of up to 30% is subtracted from it, and the total price of the metals in the catalyst is calculated.

For example, you have 1 kg of catalysts containing 1 gram of Palladium (3000 rubles per gram) according to the XRF test. In this case, you can get 3000 - 30% = 2100 rubles for this mass

Each catalyst has a different content of Platinum, Palladium or other precious metals, so XRF is required when selling them.

Where can you find catalysts containing platinum?

More often, catalysts are supplied to purchase points by service stations, car dismantlers and organizations involved in the purchase of scrap metal. Less often, catalysts are brought by an intermediary who buys the units from the population at lower prices.

Sources

zr.ru/content/articles/922074-flamegasitel-catalizator/
zen.yandex.ru/media/autolifestyle/ubral-katalizator-i-vot-chto-izmenilos-v-povedenii-avtomobilia-rasskaju-kak-na-etom-mojno-esce-i-zarabotat-5f1aa0f3dae5eb15901a3548
drive2.ru/l/548535357054910514/
drive2.ru/l/1056727/
zen.yandex.ru/media/id/5c49e7b7df2d7400ade0306d/kak-i-za-skolko-mojno-prodat-otrabotannyi-avtokatalizator-5d25044f23371c00ad7b9f65

What muffler can be installed on the “seven”

There are 4 options for replacement:

If you do not have welding skills, the fourth option is automatically eliminated. All that remains is to choose between stock and sports parts.

A straight-through muffler differs from a standard muffler in the following ways:

The forward flow resistance is significantly less than the factory model of the muffler. The design makes it possible to ventilate the cylinders more efficiently and increase engine power by up to 5 hp. With. A side effect is a higher noise level, which brings pleasure to fans of extreme driving.

The stock design muffles noise due to several internal partitions and additional perforated pipes, causing gases to change direction and be reflected repeatedly from obstacles. Hence the high resistance of the element and a small drop in power.

Tuning enthusiasts install forward flow in combination with other means - zero-resistance filters, turbines, and so on. Replacing a standard muffler with a direct-flow muffler without performing other measures will give one result - a loud rumble, you will not feel an increase in engine power.

It is not difficult for a car enthusiast who owns a welding machine to make a forward flow independently:

You can refine the outlet pipe using a nickel-plated decorative nozzle. The choice of products in size and shape is extremely wide, the prices are quite affordable.

Video: making a direct flow with your own hands

Lada 2107, 250 thousand without capital › Logbook › Replacing the VAZ-2107i injector resonator

Hello everyone, back in the winter on New Year’s Eve the resonator burned out, it was 4 years old, it was inherited from the previous owner, I changed the main muffler about a year and a half ago. I decided to wrap it with asbestos cord until spring, but after a month it burned out, so I wound it again.

Recently it became warmer, and the whipping started again - I decided to replace it.

I bought a resonator made in Tolyatti in advance; the main muffler was from the Seversky Pipe Plant, near St. Petersburg.

It turns out that there are 2 types of injector: Euro-2 and Euro-3. It differs in the bend of the flange and, it seems, in length. Before purchasing, I had to look under the car to make sure I have Euro-2, so the pipe with the flange has a bend, while for Euro-3 it is straight.

For some reason I bought a metal-graphite ring with bolts, which is used to connect the exhaust pipe and the catalyst, in my case they are not needed - the resonator with the catalytic converter has a rigid flange connection. But I think sooner or later they will also come in handy.

I prepared the tools, lubricant and sealant, there was an extra clamp left over from the last time.

With sin, I unscrewed two stuck bolts from the flanges; the clamp on the muffler came off easily, since it lubricated the threads even when replacing the muffler. During removal, the resonator flange completely came off - it was already held on by snot.

I had to unhook the muffler to disconnect the pipelines; the fastening belt broke, but fortunately I have a spare repair kit, also from last time.

The catalyst honeycomb is visible.

Just for fun, I decided to measure the thickness of the metal pipe of the new resonator - it is about 1.5 mm.

It looks well made, the seams are from an automatic machine, for some reason the article number comes from the “six”, although it seems that no injectors were installed on them.

Before reassembling, I lubricated the joints with a thin layer of graphite paste.

During installation, a problem immediately arose - the bend of the muffler began to rest against the bottom of the car - this is the geometry.

I tried this way and that, but still something stuck somewhere - either in the handbrake cable bracket, then in the cable itself, or in the shock absorber.

There was no autogen, to heat it up and bend it, I had to cut off a couple of centimeters from the tip of the resonator pipe with a grinder.

Somehow we managed to move it a couple of centimeters away from the bottom. Before the final tightening, I also lubricated all the bolts with copper grease, and on top of that with graphite grease, and installed new engravers.

I also lubricated the wire securing the muffler belt with pushsal, since everything there also rusts and you have to tear the belt with a mounting tool or saw it.

Upon inspection, it turned out that siphonage was coming from the new resonator at the place where the 2 halves were welded from a small hole of half a millimeter. It was discovered by the condensate coming out - such is the quality of production, they don’t even check the tightness of the seams.

I didn’t have time to drip it with electric welding or cover it with epoxy, I’ll fix it next time.

Subscribe! Good luck on the roads!

What will be required for replacement?

1) New resonator (other names: first stage muffler or additional muffler).

Aluminized Transmaster Universal stainless steel resonator. (double barrel)

Which resonator to choose: one or two tanks (barrels)? Single barrel or double barrel?

The first Zhiguli models were equipped with additional mufflers with one barrel, and on cars with a more powerful engine with a volume of 1.5, 1.6 liters (VAZ 2105, 2106, 2107) - double-barrel ones.

There is no particular difference in installing a resonator with 1 or 2 barrels; they are interchangeable and will fit any model, with the exception of the VAZ 2102, 2104 station wagons.

As for the noise level, an additional muffler with one barrel is considered a little noisier, but it gives a slight increase in power to the car (there is no additional exhaust resistance). Although the increase in this power is barely noticeable.

A classical resonator consisting of two “cans” is less noisy. Usually, the first can is a fire extinguisher.

2) Two metal clamps (44 mm - for the junction with the main muffler, 46 mm - for the junction with the exhaust pipe). Slightly larger clamps are also suitable, for example, with a diameter of 44.5 mm. and 48 mm.

Muffler clamp d44.5 mm and d48.5 mm

3) Graphite grease

4) Medium-grain sandpaper (sanding) 5) Wrenches for “7”, “13” mm. 6) Universal fluid WD-40 (“vd”, “vedeshka”) 7) Hammer, wooden spacer, screwdriver.

What to do if the muffler on a Zhiguli is knocking

You immediately need to figure out which part the muffler pipe is knocking on. On VAZ classic cars there can only be two options:

In each case, the order of work will be different. If the muffler loudly hits the gas tank while driving, this indicates that the connecting clamp between the muffler and the resonator was installed incorrectly, which is why the “muffler” moves to the side. That is, you need to drive the car into the inspection hole again and make sure that all the muffler connections are correct.

Manufacturers of resonators for VAZ 2107

In the post-Soviet space you can purchase resonators from many manufacturers. The production devices in greatest demand are:

OJSC AvtoVAZagregat (manufacturer of original parts);
OJSC Togliatti Plant of Technological Equipment;
LLC "Izhora Silencer";
TRANSMASTER UNIVERSAL (manufacturer of exhaust systems made of regular and stainless steel).

There are no big differences between the products of these brands. The service life of resonators made of refractory steel is approximately the same and amounts to 20-30 thousand kilometers. The service life of stainless steel products is approximately twice as long, but the price is one and a half times higher than the price of analogues made of ferrous metal.

Stainless steel resonators last much longer than conventional ones, but they also cost significantly more.

Problems with the muffler and other elements

The main noise reduction section of the VAZ 2107 lasts for 10-50 thousand kilometers. Such a wide range is explained by different product quality and operating conditions. The service life of the receiving pipe and resonator lies within the same limits.

The occurrence of muffler malfunctions is characterized by the following symptoms:

On injection VAZ 2107 models, malfunction of oxygen sensors causes increased fuel consumption, unstable operation of the power unit and loss of power.

A rumble and roar indicate burnout of the exhaust pipe or muffler tank, which occurs for the following reasons:

The nuances of muffler repair

The muffler of “classic” VAZ cars, according to the manufacturer’s recommendations, cannot be repaired. If a malfunction occurs in any element of the exhaust tract, the part must be replaced with a new one.

In fact, motorists often prefer to repair holes burned in the muffler - the most common defect - by welding.

The occurrence of “fistulas” is indicated by a change in the sound of the engine and the appearance of smoke from under the car. To troubleshoot, place the machine on a platform and inspect the elements of the exhaust system.

If the cause is a burnt gasket, remove the muffler and replace it. When you have an assistant, you can do without removing all elements of the system. Proceed in the following order:

Unscrew the pipe fastening to the gearbox.
Unscrew the nuts securing the exhaust pipe to the manifold.
Together with an assistant, pull the “pants” off the pins while simultaneously rotating the bend of the resonator pipe.
Replace the gasket, install the pipe in place, tighten the fasteners.

A welded muffler usually lasts less than a new one. But welding is also cheaper than buying. Usually, if it is necessary to repair a muffler by welding, they turn to professionals. If you have the equipment, you can do the work yourself. For this you will need:

welding machine;
blanks for patches made of sheet metal 1–2 mm thick;
a piece of pipe of the same diameter as the failed one;
grinder with cutting disc for metal;
metal brush;
sandpaper;
heat-resistant paint for metal.

To repair the muffler, follow this sequence:

Remove the muffler from the vehicle.
Using an external inspection, determine the location of the malfunction and the extent of the damage.
If there is a large hole in the muffler body, evaluate the condition of the internal parts. It is possible that repairing the external surface will not bring the desired restoration of the functions of the muffler without replacing the internals. In this case, it is advisable to contact professionals or simply replace the faulty part with a new one.
Cut out the burnt area. From the blank, make a patch larger than the damage. Weld the patch over the hole with a continuous seam.
If there is damage at the junction of the pipe and the muffler body, cut out the defective area, replace the damaged part of the pipe, and weld the repaired pipe to the muffler with a continuous seam.
Clean the repaired muffler from dirt and rust, paint the part with two layers of heat-resistant paint.

Video: repairing a VAZ muffler by welding

Replacing and repairing a muffler is a dirty and time-consuming job. But there is nothing complicated about it. You never know what you can do till you try.

Sooner or later, every owner of a 7 has to deal with muffler repair. To carry it out, you will need minimal knowledge of what the muffler consists of:

Resonator (consists of a front and rear muffler and is located between the “pants” and the main one).
The downpipe (colloquially “pants”, as it has two branches).
Connections between these parts.
Attaching the muffler to the bottom of the car.

What needs to be changed:

First of all, the main muffler.
Less often - a resonator.
Pants are a very rare case.

Types and causes of malfunctions:

The muffler may burn out due to high temperatures.
The formation of corrosion due to poor fuel and condensation, which leads to metal rotting and the formation of holes in the muffler.
Mechanical impacts, sand, gravel, salt on roads.
Poor quality parts installed previously.

What will tell you if the muffler is faulty? First of all, the usual sound of a running engine will change, it will begin to growl. There will be a persistent smell of exhaust gases in the cabin.

A trip in such a car will not be very comfortable, problems will arise in obtaining a diagnostic card for issuing an MTPL policy, and increased attention from traffic police officers will be ensured. In addition, a faulty muffler will not provide proper ventilation to the cylinders. What mufflers are on sale for 2107

These are stamped and welded products from Takt, Togliatti and AvtoVAZagregat. It is the latter that is the original, so it is better to buy it. The cost of Takt mufflers is from 700 rubles, Tolyatti mufflers – from 850 and the original – from 1000 rubles. Prices are given in Moscow.

What mufflers are on sale for 2107. These are stamped and welded products from Takt, Togliatti and AvtoVAZagregat. It is the latter that is the original, so it is better to buy it. The cost of Takt mufflers is from 700 rubles, Tolyatti mufflers – from 850 and the original – from 1000 rubles. Prices are given in Moscow.

Purpose of the exhaust system

Before combustion in the engine cylinders, gasoline is mixed with air and supplied through the intake manifold into the combustion chamber. There, the mixture is compressed eight times by the pistons and ignited by a spark from the spark plug. As a result of the process, 3 components are formed:

Since the efficiency of internal combustion engines does not exceed 45%, about half of the released energy is converted into heat. One part of the heat is removed by the engine cooling system, the second is carried out by the exhaust gases through the exhaust tract.

The VAZ 2107 exhaust system performs several important functions:

On “sevens” with an injection power system, the exhaust tract solves another important task - it cleans the exhaust from toxic gases CO and NO by afterburning in a catalytic converter.

Instructions for replacing the resonator

Since the resonator on the VAZ 2107 is not attached to the body, it is necessary to hold it when replacing so as not to deform the exhaust pipe.

Resonator VAZ 2107

Tap the pipe connections and clamps with a hammer, as in the previous case.
First of all, we disconnect the resonator from the muffler, then from the “pants”. When connecting the resonator and the receiving pipe, we proceed according to the same scheme, bend the petals, use a “liquid key” or a grinder in the most extreme case, and very carefully.
At the point where the resonator meets the muffler, the situation is more complicated. When the pipes have become stuck, we cut off a piece of pipe coming from the resonator, then remove the remaining part from the flare using a gas wrench or pliers. Usually in this place the pipes are stuck tightly, when it is impossible to separate them, we also change the muffler
We install a new resonator, observing its original position. If the resonator is installed incorrectly, it will start knocking on the underbody or hitting uneven roads. It is desirable that the resonator pipe running from the receiving tube to the tank be parallel to the ground
In the same way, we align the connection of the resonator with the silencer so that the tank is parallel to the ground and does not knock on the body

Changing the “pants” (reception pipe)

When replacing VAZ 2107 pants, be sure to stock up on a new gasket between the pants and the manifold, because it is destroyed when removed. It is also recommended to replace the nuts securing the pants to the manifold. So:

First, disconnect the pants from the resonator. If problems arise, as in the case of the resonator, given the fact that the pants are replaced less often than other parts of the muffler, and the heating temperature of the connection during engine operation is quite high, we use an angle grinder.

Mounting for a carburetor engine. Nearby is the injector pants mount

After removing the resonator, unscrew the four nuts securing the exhaust pipe to the manifold.

Removal process

In the process of removing an element of the exhaust system from a VAZ 2107 (injector) for its subsequent replacement. The following tools will be useful to you:

To figure out how to remove the muffler from your VAZ correctly and replace it. Please read the following instructions carefully:

After this, the product can be freely removed to be replaced with a new one, which is installed in the reverse order.

Please note that the connection between the muffler pipe and the resonator pipe is located in front of the rear axle. The ends of the pipe with slots and female-male fasteners are tightened using a coupling. Removal of the product can be complicated by corrosion, which develops under the influence of temperatures and lubrication.

For this reason, moisten corroded parts with an anti-corrosive agent in advance (motor oil or brake fluid will also work). If you are planning to install a new muffler, it would be a good idea to purchase new suspension rubber bands (1 for the rear and 2 for the center location).

Replacing the muffler VAZ 2107

The VAZ 2107 muffler (injector and carburetor) is connected to the resonator with a clamp, which is located in front of the rear axle. Before removing the clamp, it should be tapped with a hammer to make it easier to unscrew the threaded connection and uncouple the pipes. To change the muffler, you need to do the following:

loosen the clamp bolt and remove (move) the clamp;
pull the flared muffler pipe off the resonator (if that doesn’t work, knock it down with a hammer and chisel);

Advice: if you can’t separate the parts, you need to cut off the “petals” of the muffler pipe with a grinder.

remove the muffler from the cushion and mounting straps;
install a new muffler on the VAZ 2107;
tighten the clamp.

Repair of the exhaust system of VAZ 2104

Is it possible to avoid replacing the muffler, resonator or downpipe? In some cases, yes, it is possible. This is done by welding the place where you found a problem - a crack, a broken hole or rotten metal. You can weld the muffler with your own hands, but it is better to contact a professional welder. He will be able to determine the feasibility of this type of repair. Usually, metal allows it to be welded, but there are times when there is simply no need to weld it. That’s when you need to replace the muffler on the VAZ 2104. If the repair decision was approved, then there are several options:

The first is to fix the problem directly on the car without removing the damaged part of the exhaust system. There is no need to explain anything here.
The second method is when it is not possible to weld to the damaged area. In this case, see the tips on removing exhaust system parts provided in the instructions below.

You can try welding the muffler

The nuances of muffler repair

The muffler of “classic” VAZ cars, according to the manufacturer’s recommendations, cannot be repaired.

If a malfunction occurs in any element of the exhaust tract, the part must be replaced with a new one.

In fact, motorists often prefer to repair holes burned in the muffler - the most common defect - by welding.

If the cause is a burnt gasket, remove the muffler and replace it. When you have an assistant, you can do without removing all elements of the system. Proceed in the following order:

Unscrew the pipe fastening to the gearbox.
Unscrew the nuts securing the exhaust pipe to the manifold.
Together with an assistant, pull the “pants” off the pins while simultaneously rotating the bend of the resonator pipe.
Replace the gasket, install the pipe in place, tighten the fasteners.

Replacing a burnt muffler gasket eliminates extraneous sounds from the engine

A welded muffler usually lasts less than a new one.

But welding is also cheaper than buying. Usually, if it is necessary to repair a muffler by welding, they turn to professionals. If you have the equipment, you can do the work yourself. For this you will need:

welding machine;
blanks for patches made of sheet metal 1–2 mm thick;
a piece of pipe of the same diameter as the failed one;
grinder with cutting disc for metal;
metal brush;
sandpaper;
heat-resistant paint for metal.

To repair the muffler, follow this sequence:

Remove the muffler from the vehicle.
Using an external inspection, determine the location of the malfunction and the extent of the damage.
If there is a large hole in the muffler body, evaluate the condition of the internal parts. It is possible that repairing the external surface will not bring the desired restoration of the functions of the muffler without replacing the internals. In this case, it is advisable to contact professionals or simply replace the faulty part with a new one.
Cut out the burnt area. From the blank, make a patch larger than the damage. Weld the patch over the hole with a continuous seam.
If there is damage at the junction of the pipe and the muffler body, cut out the defective area, replace the damaged part of the pipe, and weld the repaired pipe to the muffler with a continuous seam.
Clean the repaired muffler from dirt and rust, paint the part with two layers of heat-resistant paint.

Photo gallery: muffler welding

If there is damage at the joints of the pipe and the muffler body, weld the repaired pipe to the muffler with a continuous seam. From the workpiece, cut a patch larger than the damage. Weld the damaged pipe with a continuous seam.

Video: repairing a VAZ muffler by welding

Replacing and repairing a muffler is a dirty and time-consuming job. But there is nothing complicated about it. You never know what you can do till you try.

The exhaust system of a car performs two useful functions at once: releasing exhaust gases, partially cleaning them, and also reducing the noise level from the operation of the internal combustion engine.

Today we will talk about such an important part as the resonator. Let's try to figure out why and how the replacement is performed.

The resonator of any car is an additional muffler that reduces the noise level of the engine. In addition to the main “can,” the resonator, or as it is also called, receiving pipe can be equipped with an additional one.

It is worth noting that the resonator operates at high temperatures. Exhaust gases at high temperatures are supplied to it, which gradually cause the heat-resistant metal to wear out. In addition, the resonator on the VAZ 2107 is too close to the road surface, which causes mechanical damage to the exhaust pipe.

Ultimately, holes appear on the surface of the resonator, which disrupt its operation. Exhaust gases escape through these defects, creating an unpleasant sound of the engine, which is not only unpleasant to others, but will certainly not leave traffic inspectors indifferent. That is why a damaged resonator must be replaced immediately.

Design and operation of the exhaust tract

The exhaust system includes 3 main elements (starting from the power unit):

double exhaust pipe, in driver's jargon - “pants”;
middle section equipped with one or two resonator tanks;
the last section is the main muffler.

3 sections of the exhaust system are connected using clamps

According to the factory operating instructions for the car, the exhaust manifold is a part of the engine and does not belong to the flue gas exhaust system.

The number of resonators in the middle part of the tract depends on the type of engine installed on the VAZ 2107. If the car was equipped with a 2105 engine with a working volume of 1.3 liters, 1 tank was provided per section (modification of VAZ 21072). Cars with 1.5 and 1.6 liter power units (VAZ 2107-21074) were equipped with pipes for 2 resonators.

The length of the element is the same for all carburetor modifications of the VAZ 2107, but on cars with more powerful 1.5 and 1.6 liter engines, 2 resonator banks are provided

More information about the design of the carburetor: https://bumper.guru/klassicheskie-modeli-vaz/toplivnaya-sistema/karbyurator-ozon-2107-ustroystvo.html

On a VAZ 2107 with a 2105 engine, it is not advisable to install a section with 2 tanks - this reduces the power of the power unit. Dreaming of quiet operation of the 1.3 liter engine, I personally tried to change the 1-tank resonator to a 2-tank one. I didn’t notice a decrease in the exhaust sound, but I clearly felt a drop in traction under load.

The entire tract is attached at 5 points:

the flange of the “pants” is screwed to the outlet manifold with 4 bronze M8 nuts;
the end of the exhaust pipe is attached to the bracket on the gearbox;
the flat muffler tank is hooked by 2 rubber hangers;
The muffler outlet pipe is fixed with a rubber cushion screwed to a metal body bracket.

The principle of operation of the tract is quite simple: the gases pushed out by the pistons pass through the manifold and “pants”, then enter the resonator section. There, preliminary suppression of sound vibrations and a decrease in temperature occur, after which the combustion products enter the main muffler. The latter reduces the noise level as much as possible and releases gases to the outside. Heat transfer and cooling of the smoke occurs along the entire length of the exhaust elements.

On the injection “seven”, the gases undergo additional purification in the catalyst

On “sevens” with an injector, the exhaust design is supplemented with a catalytic converter and oxygen sensors. The element is located between the receiving pipe and the second section, the connection method is flange. The catalyst cleans flue gases from toxic compounds (nitrogen oxide and carbon), and lambda probes inform the electronic control unit about the completeness of fuel combustion based on the free oxygen content.

How to eliminate the smell of gasoline in the cabin: https://bumper.guru/klassicheskie-modeli-vaz/toplivnaya-sistema/zapah-benzina-v-salone-vaz-2107-inzhektor.html

How to repair a muffler with your own hands

Before you begin repairing the muffler, you need to evaluate the feasibility of these actions. Not every car owner has the skills to work with a welding machine. In addition, the muffler cannot always be properly repaired - in cases of severe burnout, it is best to immediately replace it with a new one.

Reasons for failure

Most often, mufflers on the VAZ 2106/2107 lose their functionality for the following reasons:

mechanical damage while driving on uneven roads, impacts;
rapid changes in temperature conditions, especially in winter, when it is cold outside, and inside the case there are very high temperatures due to exhaust;
impurities in gasoline that come out along with exhaust gases and affect the condition of the metal surfaces of the muffler.

It is unsafe to operate a car with such damage to the muffler.

However, how urgently do you need to repair the muffler if you suddenly notice some damage to its body or black exhaust from the pipe? What are the dangers of operating a Zhiguli with a burnt out or deformed muffler?

Firstly, if there are holes in the body of any element, then the generated gases will enter the cabin. The main danger is that the exhaust is colorless and odorless and cannot be felt. In this case, the driver begins to experience headaches, nausea and dizziness. If you stay inside a car with the engine running for a long time, you can lose consciousness and even die.

Secondly, if the exhaust system does not work properly, engine power is reduced. This is especially noticeable when accelerating, starting from a standstill, or overtaking.

Thirdly, if the plug is faulty, the engine begins to consume a lot of gasoline. The carelessness of the car owner will lead to the fact that the muffler will work worse and worse, and the displacement per 100 km will increase.

How to weld a muffler

Most often, the muffler loses its tightness and therefore cannot work normally. In this case, holes can appear both on the pipes themselves and on the welds.

It is recommended to clean the weld seam and paint the work area with heat-resistant paint

Using a welding machine and metal patches can be considered the most reliable way to repair mufflers.

In order to weld a “muffler”, you need to prepare electrodes of a suitable size (it all depends on how large the hole is burned in the muffler) and a sheet of metal of the required size. After which it is recommended to carry out welding as far as possible from the edge of the holes, since the thinned edges of the metal can quickly collapse:

Clean the torn edges of the muffler from rust and dust.
Degrease the metal with a solvent.
Apply a metal patch to the body and grab it in several places around the perimeter of the hole.
After this, you can begin to apply full welds.
After the seams have hardened, it is recommended to clean the slag with a wire brush.

It is recommended to apply welds carefully so as not to burn through the muffler body

How to change the gasket

There is a reinforced gasket between the main muffler and the resonator part. Its purpose is to prevent the resonator from heating, so it is made of heat-resistant metal.

After dismantling the muffler, it is recommended to change the gasket. This does not take much time, since the element is inserted into the muffler pipe and clamped between its parts.

How to replace hanging rubber bands

This is perhaps the simplest procedure in repairing Zhiguli mufflers. The rear part of the pipe is attached to the body with three hanging rubber bands. During the ride, some of them may get lost or seriously deformed.

To change these rubber bands, you just need to drive the car into an inspection hole or overpass, remove the old products and install new ones in their place. Some car owners change suspension rubber bands without an overpass, simply crawling under the body from the rear left side.

When to change the resonator

To change the resonator, you need to stock up on all the necessary keys, kerosene or WD-40, as well as a lot of patience and accuracy. The fact is that high temperatures cause the exhaust pipe fasteners to melt, which subsequently makes it difficult to remove. In addition, you will need an inspection hole or overpass, otherwise changing the resonator will be very inconvenient.

Many automotive technicians suggest applying sealant before installing the exhaust system. Whether to do it or not is up to you. In any case, the reliability of fastening and sealing the exhaust system is limited only by the force that the clamp allows you to make.