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I got a replacement exhaust to put on my 1.4s year 2000 civic code MB2. The cat joins to the centre section with 3 bolts spaced in a triangular pattern. Now I asked the supplier for the gasket between cat and centre section and what they gave me was a hard metal ring however the diameter was too large to fit the recess in the bore of the centre section so I couldn't see how it was ever going to work.

Can anyone confirm what sort of gasket there should be? I was expecting an asbestos-type gasket with three holes in it rather than a solid metal ring but maybe it does use some kind of crush ring instead? ...and if so should it fit in the recess of the centre section or does the cat have a larger recess for the larger ring that looked like it was wrong for the centre section?

Haven't taken the old one off yet as I wanted to get all the parts together first so I'm not stuck half way through the job.

 
Rep Power: 517

Honda does use ring type gasket on many exhaust parts, it's likely they gave you the ring that fits the opposite end of the cat. Can you look up in a catalog yourself to double check the part number?

 
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Unfortunately all I have is a EuroCarParts number which seems to be for internal use only. I left the part in the shop as it didn't look right but maybe it was depending on, as you say, the cat side. Think I might just have to take it apart and see what's in there. I have watched a couple of youTube vids but these showed a normal gasket with three holes in it as I was expecting.

 
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From digging around on the internet, looks like it should be a crush ring approx 53mm diameter so bigger than the recess in the centre silencer; asuming that the cat is standard then it must have a larger recess to take this ring.

 
Rep Power: 517

I meant use a Honda parts catalog to see what the factory installed there, and order or purchase one from a dealer if it matches your parts.

Factory cats here normally use rings of different size on each end -- when both ends have bolted flanges. (I don't know what style your particular car is equipped with)


Does this catalog link cover your area and car?

http://www.lingshondaparts.com/honda_car_parts_catalogue_C01.php

 
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Thanks but already tried that and another Honda parts site; neither listed my car or the seal.
As it happens when I went to do the work I didn't have to change the centre section, only the rear. But not before I broke two bolts on the stupid cat shield. I was going to renew the centre section but the metal on the cat to centre pipe flanges looked pretty thin and well rusted together and thought I might break the cat flange if I tried to seperate them so didn't bother. That downstream O2 sensor looks difficult to get at too; is that a cat off job to change it?

 
Rep Power: 517

There are a few different special sockets for O2 sensors.

Hope this pic works