Tuesday, October 22, 2013
How to Remove a Catalytic Converter from a Chevy Truck
The two catalytic converters in a Chevy truck are connected to the exhaust system. They help reduce pollutants and control emissions in order to meet both federal and state regulations. If either catalytic converter is not working, it needs to be removed to check for any blockages, or for replacement.
Instructions
- 1
Raise and support the entire truck on jack stands. Disconnect the negative cable on the battery as a precaution.
2Disengage the electrical connectors to the oxygen sensors. There are two oxygen sensors attached to each catalytic converter---a pre-converter sensor located near the front end of the converter and a post-converter sensor near the end.
3Use a small ratchet wrench to remove the flange bolts connecting the catalytic converter to the exhaust pipe. Separate the pipe from the converter, and support the pipe. You can use the trucks floor jack, but place a board on top of the jack to keep it from damaging the pipe.
4Remove the bolts that attach the converters header pipe to the exhaust manifold. The studs and nuts here often are rusty, so apply penetrating oil to them for easier removal.
5Take off the catalytic converter and its pipe assembly. Repeat for the other converter if needed.
6Clean away any carbon deposits built up on the mounting flanges with brake cleaner or the penetrating oil. Discard the gaskets; use new gaskets on the flanges when the new catalytic converter is installed.
