Pic. 3.66. Exhaust system: 1 - main muffler; 2 - central exhaust pipe; 3 - catalytic converter; 4 - front oxygen concentration sensor, 50 Nm; 5 - intake exhaust pipe; 6 - gasket; 7- rubber suspension; 8 - gasket; 9 - dynamic damper; 10 - bracket; 11 - gasket; 12 - rubber suspension
The exhaust system consists of three main parts. The exhaust gas system ensures the removal of exhaust gases into the atmosphere, reducing the concentration of pollutants, reducing engine noise to the required level with minimal engine power loss. In order for the exhaust system to perform its functions, it must be in good condition. The condition of the exhaust system also affects engine power and fuel consumption.
Silencers are designed to smooth out pulsations in the exhaust gas flow and reduce noise levels.
The exhaust system is attached to the bottom of the car using elastic elements to reduce vibration from the passage of exhaust gases.
Exhaust gas leaks in the exhaust system are usually caused by damaged gaskets and leaky pipe connections or damage to the mufflers received from shocks while driving. Exhaust gas leaks lead to increased noise, as well as vibration from the contact of the exhaust system elements with the car body.
Before removing or disassembling the exhaust system components, impregnate the bolts and nuts of the exhaust system components with a loosening fluid. Wait 5 minutes for liquid to penetrate into the threaded connection. After working on the exhaust system, move the car's exhaust system to the sides, check that it does not touch the car body. If not, replace the exhaust rubber mounts.
Always start at the front of the vehicle when aligning and tightening the exhaust system components.
The threads of the new oxygen concentration sensor are coated with a special non-stick composition consisting of fine particles of graphite and glass. When the engine is running, the graphite burns out, but the glass layer will remain in place, which will subsequently make it easier to turn the sensor out of the exhaust pipe. If the sensor has been removed, be sure to apply a non-stick compound to its threads before reinstalling it.
The oxygen concentration sensor is connected by a flexible wire to the connector. This flexible wire must not be disconnected from the sensor. Damage or removal of the flexible wire may adversely affect the function of the oxygen concentration sensor. Do not drop or hit the oxygen sensor.