The main one is installed on the collector 4 (control) oxygen concentration sensor 3, and on the inlet pipe 8 - diagnostic oxygen concentration sensor 7.
A metal-reinforced sealing gasket 2 is installed between the cylinder head and the exhaust manifold flange.
The inlet pipe is connected with one end to the flange of the exhaust manifold, and with the other end to the inlet pipe of the additional muffler. The additional and main mufflers are connected by pipe 13.
The flange connection of the exhaust manifold and the inlet pipe is sealed with a metal-reinforced gasket 5.
Similar gasket 9 (just a different shape) the flange connection of the inlet pipe and the additional muffler is sealed.
The remaining connections of the system are welded; when replacing an additional or main muffler, the connecting pipe 13 is cut and then the new elements are secured with clamps, each of which is welded at one point to the pipes of the main and additional mufflers.
In order to reduce the transmission of vibrations from the power unit to the exhaust system and body, a corrugated vibration-compensating bellows 6 in a metal braid is mounted in the intake pipe.
The system elements are suspended from the body on four rubber cushions. Cushions A of the additional muffler suspension and B of the main muffler suspension differ in shape and are not interchangeable.
To protect the cooling system radiator, body base and fuel tank from heating by system elements, steel heat shields are installed on the exhaust manifold, the exhaust pipe of the additional muffler and the main muffler.
The exhaust system does not require any special maintenance. It is enough to periodically check the reliability of the tightening of the threaded connections and the integrity of the suspension cushions.
USEFUL TIPS: Check the exhaust system periodically. If the exhaust system is noisy, check for leaks. To do this, start the engine and inspect the entire system. Run your hand over the possible leaks without touching the components, and you will immediately feel the gas leak. If necessary, replace rusted and burnt components.
If it is impossible to replace the defective unit with a new one, you can temporarily restore its functionality by applying a metal patch to the damaged area and securing it with clamps or wire. It is recommended to put a sheet of asbestos under the patch. In addition, auto parts stores sell special kits for restoring exhaust system units, with the help of which you can temporarily eliminate damage to the system in order to get to a car service center or garage.
WARNING: Allow the exhaust system to cool before repairing, as it heats up to a high temperature when the engine is running. Exhaust gases are toxic, and poisoning by them occurs unnoticed, so be sure to open the garage door before starting the engine!
The original text can be found on the website «chevyman»