The original Buick Sail car did not have a middle section of the exhaust pipe, but only a front section and a tail section. The front section starts from the exhaust manifold to the rear of the car body, including the three-way catalyst and the front muffler, which are all welded, which is quite unfriendly to maintenance.
So domestic JS found business opportunities and provided a separate so-called middle section of the exhaust pipe, that is, the section from behind the three-way catalyst to the front end.
The interior of the front muffler of the original car has been completely corroded and damaged, and the external interface with the pipe has also been corroded and cracked. After welding many times, it cannot be repaired. So I bought a middle section of the exhaust pipe and constructed it myself, and briefly talked about the process and repair effect.
Exhaust pipe structure, schematic diagram of cut-off position
tool list
1. For cutting machine, I use Makita’s DG404 brushless lithium electric angle grinder, which is powerful and easy to use;
2. One set of combination tools;
Accessories, consumables
1. Middle section of exhaust pipe;
2. Special sealant for exhaust pipes, I use Woolth’s;
3. Aluminum foil adhesive tape;
construction process
1. Cut the exhaust pipe of the original car. Cut the original exhaust pipe from behind the three-way catalyst and be as close to the front muffler as possible to avoid cutting too many new exhaust pipes and not enough length. In this way, the shock-absorbing ring of the original car (that is, the annular iron piece) can also be retained;
before cutting
after cutting
2. Carefully clean the interface and apply exhaust pipe sealant. Connecting the middle section of the exhaust pipe is simple to say, but the installation is quite torturous. The middle section of the exhaust pipe is a product invented by our country. The workmanship is poor and the size is very poor. The diameter of the interface flare was small and out of circle. It was barely inserted after violently knocking with a hammer. Same as the tail segment interface.
Note: Exhaust pipe sealing requires special sealant. Ordinary engine silicone, AB glue, etc. cannot work. Because the temperature is too high, this kind of glue may cause a fire.
3. After roughly adjusting the position, stick aluminum foil tape at the interface to improve sealing.
Apply special sealant for exhaust pipes to the interface
Apply exhaust pipe sealant and then cover it with aluminum foil tape to improve tightness
4. Install the metal clip.
After installation, the front interface.
After installation, the front end is still tilted to the left
It may not seem complicated, but it is actually not smooth.
I bought two middle sections of exhaust pipes. The size of the first one was too poor. No matter how I adjusted it, the three-way catalyst would be severely tilted to the left and would hit the car body.
The second one was better, but when it was installed for the first time, because the size was too long, the tail section would hit the hook, so I had to remove it and cut off a section. But the size is still not good enough. The three-way catalyst is positioned to the left, but it will not hit the car body.
I have tried my best to be perfect, but I have to focus my energy on high-level things such as lunar exploration and Mars landing. These scumbags are really scumbags.
WardElectra 
3 
September 4, 2024 
