All cars are equipped with catalytic converters to reduce the amount of harmful substances emitted into the atmosphere with exhaust gases.
The inlet and outlet cones with branch pipes and mounting flanges, as well as heat reflectors holding the ceramic lining, are welded to the stainless steel body of the neutralizer. The entire internal volume of the housing is occupied by a porous ceramic catalyst monolith fixed by stainless steel rings or mesh. The catalyst is a filter in which the entire inner and outer surface of the pores in contact with gases is covered with a very thin layer of an alloy that contains platinum, rhodium and palladium. The porous catalyst has a large surface area coated with this alloy of very expensive metals, which mainly determines the high price of catalytic converters.
A reaction takes place in the catalyst, as a result of which potentially dangerous hydrocarbons and carbon monoxide in the exhaust gases are converted into harmless gases and water vapor.
Replace the catalytic converter as follows:
- to facilitate unscrewing the nuts of the catalytic converter connection, first soak them with a liquid that weakens the connections;
Pic. 7.31. Catalytic converter on models up to 2001: 1 – the right support of a final collector; 2 - retainer; 3 - pillow; 4 - gasket; 5 - gasket; 6 - gasket; 7 - receiving exhaust pipe; 8 - thermal insulation; 9 - oxygen sensor (block 1, sensor 2); 10 - front part of the catalytic converter; 11 - thermal insulation; 12 – the right casing of the engine; 13 - oxygen sensor (block 1, sensor 2); 14 - front part of the catalytic converter with thermal insulation
Pic. 7.32. Catalytic converter on models from 2001: 1 - upper thermal insulation; 2 - lower thermal insulation No. 1; 3 - gasket; 4 - air-fuel mixture sensor (block 1, sensor 1); 5 - oxygen sensor (block 1, sensor 2); 6 - exhaust manifold support; 7 - exhaust manifold support; 8 - lower thermal insulation No. 2; 9 - oxygen sensor (block 2, sensor 2); 10 - exhaust manifold with catalytic converter; 11 - air-fuel mixture sensor (block 2, sensor 1)
- remove the nuts and separate the catalytic converter from the exhaust system (pic. 7.31, 7.32).
Install in the reverse order of removal.