Exhaust system: 1 - control oxygen concentration sensor; 2 - exhaust manifold; 3 - converter flange gasket; 4 - catalytic converter; 5 - diagnostic oxygen concentration sensor; 6 - intermediate pipe with a metal compensator; 7 - additional muffler; 8 — laying of a back flange of an intermediate pipe; 9 - gasket of the rear flange of the pipe of the main muffler; 10 - main muffler
Location of the exhaust system on the car: 1 - intermediate pipe with a metal compensator; 2 — a suspension bracket of system of release of the fulfilled gases; 3 - heat shield; 4 —additional muffler; 5 - main muffler
The exhaust system consists of an exhaust manifold, a catalytic converter, exhaust gases, an additional and main muffler and pipes connecting them.
The exhaust manifold is attached with eight nuts to the cylinder head studs.
A metal gasket is installed between the exhaust manifold and the cylinder head.
Sealing gasket connecting the exhaust manifold and cylinder head
The catalytic converter flange is attached to the exhaust manifold flange with three studs and nuts.
An intermediate pipe flange is attached to the other flange of the catalytic converter with a bolt and two studs with nuts (the bolt simultaneously secures the catalytic converter and pipe flanges to the cylinder block bracket).
Both connections are sealed with heat-resistant gaskets.
A control sensor for the oxygen concentration in the exhaust gases is installed in the exhaust manifold in front of the catalytic converter (Lambda probe).
Exhaust manifold with oxygen concentration control sensor
The second sensor - diagnostic - is installed in the intermediate pipe after the catalytic converter.
Diagnostic oxygen sensor (shown by arrow)
The catalytic converter meets Euro 3 emission standards by reducing emissions of carbon monoxide, nitrogen oxides and unburned hydrocarbons.
catalytic converter
In the presence of lead compounds in the exhaust gases, the catalytic converter and oxygen concentration sensors quickly fail.
Therefore, the operation of the car, even for a short time, on leaded gasoline is strictly prohibited.
The reason for the failure of the converter can also be a faulty ignition system or power supply system.
In the event of a misfire, unburned fuel, entering the converter, burns out and disables the block with catalysts, which can lead to blockage of the exhaust system and stop (or severe loss of power) engine.
A metal compensator is built into the front part of the intermediate pipe.
The intermediate pipe is connected to the pipe of the additional muffler.
A sealing gasket is installed between the pipe flanges to ensure tightness.
A heat shield is attached to the body above the additional muffler with four nuts, designed to protect the underbody from overheating.
The pipe of the additional silencer is connected to the pipe of the main silencer.
A sealing gasket is also installed in the connection of their flanges.
The entire exhaust system is suspended from the body on six rubber cushions.
Pillows of a suspension bracket of system of release of the fulfilled gases: 1 — a back pillow of a suspension bracket of the main muffler; 2 - additional silencer suspension cushion; 3 - front suspension cushion of the main muffler and suspension of the intermediate pipe
The catalytic converter, intermediate pipe and mufflers are non-separable units; if they fail, they must be replaced with new ones.
Maintenance of the exhaust system consists in its periodic inspection, checking for tightness of connections and the presence of through corrosion, tightening loose connections and replacing rubber suspension pads.