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Corolla 7th Generation (1993-1997) Specific discussion of the 7th generation

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post #1 of 38 Old 07-12-2019, 11:26 AM Thread Starter
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Angry Cat Bolts

Hi all! I've been drifting around the forums for a few weeks now, I work at an online school and it is extremely slow, like hours of sitting doing nothing. I've been reading through build threads and such, and love these forums! Anyway...


I have a 1996 Corolla Wagon ae102, auto. Since I bought it a few months ago, I've been doing all my own maintenance, and "upgrades". Since this is my first car, I'm pretty new to the maintenance, and have done things ranging from oil changes to struts to axles, even a thermostat. The fist "performance" (lol) upgrade I did was attempt to install a Cherry Bomb muffler. So, I cut off the muffler since I couldn't get the bolts off, and used that heat tape stuff to attach it. It was fine for a few months, but then fell off. I figured it's easier to just buy a catback exhaust and install the whole thing.


Well, yesterday I finish up an oil change and get under the car, and notice the nuts for the catalytic converter are totally gunked up. I attatched pictures below. Any idea of how to clean those up enough to get them off? I would prefer to not just cut the pipes, in case installation is a pain (I'm sure it will be). And also, does anyone know the wrench size and type for the O2 sensors? I have up to a 17 but it didn't fit. Thanks in advance! Oh and expect me to be active in these forums, at least as long as work is slow
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post #2 of 38 Old 07-12-2019, 11:33 AM
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Burn it off and replace them. They ain't coming out. If you don't got heat, take it to a muffler shop. That or struggle for a very long time. Same thing may happen with the O2 Sensor unless it was changed recently. My O2 Sensor was "baked" and rusted into the threads and the bolt face of the sensor ended up getting stripped with the threads that my cousin had to re-thread the hole after heating up the sensor. I ain't talking about propane heat, I am talking about the actual gas and O2 (whatever a shop uses) dual tank mixture.


Last edited by Vangm25; 07-12-2019 at 11:40 AM.
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post #3 of 38 Old 07-12-2019, 11:40 AM Thread Starter
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Burn it off and replace them. They ain't coming out. If you don't got heat, take it to a muffler shop. That or struggle for a very long time.



Hmm, that's what I was fearing. Any idea of the bolt sizes?
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post #4 of 38 Old 07-12-2019, 11:43 AM
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Originally Posted by Carvocado View Post
Hmm, that's what I was fearing. Any idea of the bolt sizes?
O2 would just be an O2 sensor socket.
https://www.harborfreight.com/78-in-...ket-63702.html

Bolts for the exhaust, whatever fits and whatever may resist rust.

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post #5 of 38 Old 07-12-2019, 11:46 AM Thread Starter
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Originally Posted by Vangm25 View Post
O2 would just be an O2 sensor socket.
https://www.harborfreight.com/78-in-...ket-63702.html

Bolts for the exhaust, whatever fits and whatever may resist rust.



I wasn't even aware that they made O2 sensor specific sockets! Thank you for that
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post #6 of 38 Old 07-12-2019, 12:09 PM
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PB-Blaster is your friend. Soak them overnight and you can remove bolts with just bare fingers!
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post #7 of 38 Old 07-12-2019, 12:13 PM Thread Starter
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PB-Blaster is your friend. Soak them overnight and you can remove bolts with just bare fingers!

That's what my friend recommended, he recommended I do it a few times a day for like a week and then attempt it! Another friend also suggested using baking soda and vinegar for the cat bolts but idk will that work?
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post #8 of 38 Old 07-12-2019, 12:45 PM
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Vinegar will work to slightly remove rust. But baking soda will neutralize it before it's had chance to do any work. Nah, just soak with PB-blaster overnight. Perhaps heat gent!y with torche. Then soak again.
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post #9 of 38 Old 07-12-2019, 01:03 PM
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Quote:
Originally Posted by Carvocado View Post
That's what my friend recommended, he recommended I do it a few times a day for like a week and then attempt it! Another friend also suggested using baking soda and vinegar for the cat bolts but idk will that work?
That is another route you can take. It just takes time and potentially jacking up your car each time. I prefer to just have it burnt off because I don't have the time or even the right tools. Just a benefit of having a cousin who works in my former shop.


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post #10 of 38 Old 07-12-2019, 01:23 PM Thread Starter
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That is another route you can take. It just takes time and potentially jacking up your car each time. I prefer to just have it burnt off because I don't have the time or even the right tools. Just a benefit of having a cousin who works in my former shop.



I'm going to do some research on shops, I assume it is pretty cheap to have them just burn off the bolts. I would have them just install it themselves but that's probably more than I even payed for the exhaust itself
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post #11 of 38 Old 07-12-2019, 01:23 PM Thread Starter
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Vinegar will work to slightly remove rust. But baking soda will neutralize it before it's had chance to do any work. Nah, just soak with PB-blaster overnight. Perhaps heat gent!y with torche. Then soak again.
Makes sense... thanks! I'm going to keep doing that and see how it works out
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post #12 of 38 Old 07-12-2019, 10:10 PM
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I was faced with this on another car one time, and just went to a muffler shop and had them remove the old bolts and install new ones, so I could get it apart and do a clutch.

2000 Corolla CE Automatic
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post #13 of 38 Old 07-16-2019, 01:53 PM Thread Starter
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Update: The shop is asking upwards of $50 to replace the bolts. Ridiculous! I'm planning on removing them myself, but does anyone know if the DNA Motoring Catback exhaust is a direct fit to the stock cat?
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post #14 of 38 Old 07-16-2019, 02:19 PM
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$50 is cheap, not many people will work for cheap. Up to you in the end if you want to struggle with it. I personally don't got the time, tools, or another vehicle to do this myself.

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post #15 of 38 Old 07-16-2019, 02:25 PM
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A Sawzall ought to do the trick.
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