There are two designs of the exhaust pipe and converter with an additional silencer assembly to comply with Euro-2 and Euro-3 toxicity standards.
The Euro-2 downpipe has a built-in control oxygen concentration sensor 5 and is connected to the converter flange using a movable hinge. A metal-graphite sealing ring 7 with a spherical surface is placed between the flanges.
The Euro-3 exhaust pipe in its design has a control oxygen concentration sensor 5 and a compensator for vibrations that occur during engine operation and while the vehicle is moving, and is connected to the converter flange using three bolts with nuts. A gasket 18 is installed between the flanges of the intake pipe and the converter. A diagnostic oxygen concentration sensor 19 is installed in the pipe behind the converter.
The downpipe 15 is fastened with nuts to the exhaust manifold studs, a sealing gasket 3 is installed between them. Locking plates 1 are placed under the fastening nuts to the manifold.
The converter 13 and the additional muffler 12 constitute a non-separable assembly, which is attached to the main muffler with a clamp, and are suspended together with the main muffler 11 to the floor of the body using two pillows 10.
Silencers together with pipes form non-separable units and are replaced with new ones during repairs.
Pic. 2-78. Exhaust system:
1 - plate;
2 - hairpin;
3 - gasket;
4 - nut;
5 - control oxygen concentration sensor;
6 - bracket;
7 - sealing ring;
8 - front floor protection screen of the body;
9 - rear body floor protection screen;
10 - silencer suspension cushion;
11 - main muffler;
12 - additional muffler;
13 - neutralizer;
14 - clamp;
15 - receiving pipe;
16 - conical spring;
17 - bolt;
18 - gasket;
19 - diagnostic oxygen concentration sensor.