Exhaust manifold on a carburetor VAZ 2114: do-it-yourself repair and replacement

The exhaust manifold is a component of the exhaust system that carries out the process of removing exhaust gases from the cylinders of the power unit into the exhaust pipe.

If the collector malfunctions, the culprit may be either the element itself or its gasket. Replacing the exhaust manifold (exhaust manifold) gasket is a common procedure when repairing a VAZ 2109.

Appearance of the unit

Causes of malfunctions

The key factor that causes 90% of exhaust manifold malfunctions on VAZ 2114 cars is high temperature and poor quality materials from which the parts are made. During operation, the steel repeatedly heats up and cools down, which leads to the appearance of cracks in the body. This is a common occurrence for VAZ cars older than 7-8 years.

Auto repair shops offer crack welding services using argon welding. However, for a number of reasons, this activity is useless for cars older than 7 years.

1) Just removing and installing the exhaust manifold will cost about 2.5 thousand rubles. Taking into account the work of the welder and other actions, the cost of repairs can be 4-5 thousand rubles. If you do the work yourself, buying a new part will cost less.

2) Welding, even argon welding, disrupts the structure of “tired” metal. A boiled part rarely lasts longer than a year, after which new holes appear. The older the car, the faster the problem returns, and the collector has to be removed again.

If the car is older than 8 years and there are problems with cracks in the manifold, it is better to remove the part and replace it with a new one.

Types of pipe layout

There are two types of exhaust manifold pipe layout:

4-1. This type consists of 4 pipes connected into one. As a rule, the number of pipes corresponds to the number of cylinders.
4-2-1. In this case, first, the pipes of the cylinders operating on the same stroke are connected in pairs (there are 2 of them), and then they are connected into one. Such collectors are most often connected to resonators, which have special “scales” inside the housing, which helps reduce the backflow of exhaust gases.
4-2-2. This type of welding of exhaust manifold pipes is used mainly for sports cars, for which a 3-4% increase in power is invaluable.

For all types of exhaust manifolds, it is possible to replace flange connections with reinforced or 3-4 layer corrugations. Flexible connections help reduce resonant frequencies.

Preparation stages

To replace the manifold or its gasket, in any case you will have to dismantle the VK. But before you get to the element you are looking for, you will first need to go through some preparatory steps. Namely, tighten the fasteners, and then remove the air filter and carburetor if the first stage does not help.

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Stage of work	Your actions
Tightening the fastenings	Often, loose manifold fastenings caused the entry of contaminants, which disrupted the performance of the exhaust system. If the tightening did not give any result, then the gasket is definitely burned out or the collector itself is damaged, which is less likely
Removing the air filter	If the engine is fuel-injected, to remove the air filter you will need to unscrew the four fastening screws of the filter housing cover. The filter itself is located under the cover. If you have difficulty lifting the cover, disconnect the mass air flow sensor and remove the filter device. If you have a carburetor under the hood, then the filter and housing will be held in place by three latches. There is a screw in the center of the metal cover, which is often unscrewed by hand. Once you remove it, you can lift the lid. There is a filter underneath, which should be removed carefully. Pay attention to its condition. If the filter has been in use for quite a long time, it is recommended to replace it during reassembly.
Removing the carburetor	Removing the carburetor is carried out in the following sequence: Disconnect the coolant supply hose to the engine starting device from the fitting. To do this, unscrew the clamps; Be sure to drain the coolant into a prepared container; Disconnect the exhaust pipe that comes from the exhaust manifold and the BC bracket; Disconnect the throttle cable bracket. To do this, you need to remove one end of the spring from the damper control rod, and then remove the entire spring. Now loosen the nut on the bracket, which will allow you to remove the cable from the engagement; Disconnect the EPH sensor from the power plug; Disconnect the vacuum tube and a pair of hoses from the carburetor heating unit; Remove the engine crankcase ventilation hose; Remove the four mounting nuts holding the carburetor and intake manifold; Remove the carburetor carefully without yanking. It must be gradually removed from the studs.

Dismantling the unit

All dismantling work must be carried out only on a cold engine. To make it easy to unscrew all fasteners, you can pre-treat them with WD40, several hours or even a day before the repair begins.

Required tool for replacement

Before you begin the process itself, you need to decide on the necessary tools. So, what will you need: a ratchet and sockets for 17, 19; screwdrivers with flat and Phillips tips; a set of keys and the gasket itself.

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Now that everything is prepared, you can start working directly. In order for the manifold to be removed without any problems and rusted bolts not to create trouble, everything must be lubricated with WD-40 before performing the operation. It is advisable to do this several times. Before performing the operation, you need to think again, weigh everything and calculate your strength.

Step-by-step instructions (algorithm with photo)

If, nevertheless, the car enthusiast makes up his mind, then we will consider step-by-step instructions for replacing the gasket:

Remove the negative terminal from the battery.
Remove the terminal from the battery
We remove the accelerator cable.
Removing the throttle cable
We are dismantling the fuel pipes. More precisely, they need to be disconnected and taken to the side.
Remove the fuel pipes shown in the photo
Disconnect the throttle position sensor connector.
We disable the TPS
Disconnect the idle air control wire connector.
Disable the IAC sensor
Unscrew the crankcase ventilation pipes and brake booster.
Unscrew the pipes shown in the photo
We are dismantling the receiver.
Dismantling the receiver
Remove the wires of the injection control unit (injectors).
We dismantle the fuel rail without dismantling the injectors.
Removing the fuel rail
Remove the thermal shield from the manifold.
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Removing the heat shield
Disconnect the exhaust pipe.
Dismantling the exhaust pipe
Remove the intake manifold.
Removing the intake manifold
After unscrewing the fastening nuts, remove the exhaust manifold.
Unscrew the fastening nuts and remove the exhaust manifold
We are replacing the gasket.
We are replacing the gasket
We carry out the assembly in the reverse order.

As you can see, the replacement of the intake and exhaust manifold gaskets takes place simultaneously and, by and large, is the same gasket material.

Part selection

21083-1008081 – original catalog number of the gasket for the intake and exhaust manifold. It consists of two parts or, on newer models, one. This part is produced at the AvtoVAZ plant. The average cost is 250 rubles per piece (if there are two of them) or 450 rubles (for a whole one).

One-piece manifold gasket

Gasket, which consists of two parts

In addition to the fact that there is an original part, you can also find a number of analogues that are recommended for installation. Let's consider which gaskets can be installed under the VAZ-2114 manifolds:

Trialli GZ 102 0013 is a well-known Russian manufacturer that produces a wide range of analog parts for domestically produced cars. The cost of the gasket is 200 rubles per piece.
AJUSA 13065200 is another domestic manufacturer that has won consumers over the quality of its products. The cost of the product is 450 rubles.
Ukrainian also produces and supplies this gasket. But, if you look at it, the quality of the product leaves much to be desired, since the resource is designed for only 20,000 km.

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Causes of malfunction

Bent valves due to incorrect valve timing

When all processes have been considered, you can proceed directly to determining the reasons for the failure of the manifold gasket. So, let's look at the main ones:

Wear . During operation, the car emits hot gases that destroy the surface of the gasket, as a result of which it can tear or delaminate.
Since there is only one gasket for the intake and exhaust manifolds, gasoline entering through the first channel can get on the gasket, which also affects the integrity and structure of the material from which it is made.
The quality of the part is not always high, even original, so when choosing, you should pay special attention to this.

Content

How to remove the exhaust manifold? This part of the process is quite simple, but before you begin, you will have to remove additional components. After all, the designers of some models tried very hard: sometimes, in order to reach something in the car, you have to disassemble half of the car. So, let's proceed directly to the process itself, described in stages.

Exhaust manifold removal procedure

Before removing the exhaust manifold yourself, think 7 times. Having this work done by a service center is not cheap, but the inaccessibility and difficulty of unscrewing some nuts can be a serious problem.

Unscrew the bolt securing the intake pipe

It is important to drain the coolant before removal, as antifreeze may enter the cylinders during the process. The sequence of actions for cars with an injector is as follows:

Disconnect the battery, release the throttle cable from the throttle valve.
Disconnect the fuel line pipes.
Disconnect the wires from the TPS and idle speed control.
Release the crankcase ventilation, vacuum, and brake booster hoses.
Remove the receiver, remove the injector block wires and remove the injector fuel rail.
Remove the bracket and thermal shield.
After this, you can disconnect the exhaust pipe, exhaust and intake manifolds from the manifold.

After disassembly, all gaskets are replaced with new ones. Please note when purchasing that the exhaust manifold for 8-valve and 16-valve VAZ 2114 are different. Select the parts carefully and you can avoid wasting time and money.