Exhaust system: 1 - oxygen concentration control sensor; 2 - exhaust manifold; 3 - neutralizer flange gasket; 4 - catalytic converter; 5 - diagnostic oxygen concentration sensor; 6 - intermediate pipe with metal compensator; 7 - additional muffler; 8 - intermediate pipe rear flange gasket; 9 — gasket of the rear flange of the main muffler pipe; 10 - main muffler
Location of the exhaust system on the vehicle: 1 — intermediate pipe with metal compensator; 2 — exhaust system suspension cushion; 3 - heat shield; 4 - additional muffler; 5— main muffler
The exhaust system consists of an exhaust manifold, a catalytic converter, exhaust gases, additional and main mufflers and connecting pipes.
The exhaust manifold is secured with eight nuts to the cylinder head studs.
A metal sealing gasket is installed between the exhaust manifold and the cylinder head.
Exhaust manifold to cylinder head sealing gasket
The catalytic converter flange is attached to the exhaust manifold flange with three studs and nuts.
The 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 flanges of the neutralizer and pipes to the cylinder block bracket).
Both connections are sealed with heat-resistant gaskets.
A control sensor for measuring the concentration of oxygen 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.
Oxygen Concentration Diagnostic Sensor (shown by arrow)
The catalytic converter ensures compliance with Euro 3 toxicity standards by reducing emissions of carbon monoxide, nitrogen oxides and unburned hydrocarbons into the atmosphere.
Catalytic converter
If lead compounds are present in the exhaust gases, the catalytic converter and oxygen concentration sensors quickly fail.
Therefore, operating a vehicle, even for a short period, on leaded gasoline is strictly prohibited.
A faulty ignition system or fuel system may also cause the neutralizer to fail.
When misfires occur, unburned fuel gets into the neutralizer, burns out and disables the block with catalytic converters, which can lead to blockage of the exhaust system and engine shutdown (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 additional muffler pipe.
To ensure tightness, a sealing gasket is installed between the pipe flanges.
A heat shield is attached to the body above the additional muffler with four nuts, designed to protect the underbody from overheating.
The additional muffler pipe is connected to the main muffler pipe.
A sealing gasket is also installed at the connection of their flanges.
The entire exhaust system is suspended from the body on six rubber cushions.
Exhaust system suspension cushions: 1 - rear suspension cushion of the main muffler; 2 — additional muffler 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 of its periodic inspection, checking for leaks in connections and the presence of through corrosion, tightening loose connections and replacing rubber suspension mounts.