Replace cat w/o removing skid plate - JeepForum.com

 
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post #1 of 13 Old 07-20-2006, 01:01 PM Thread Starter
bryris
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Replace cat w/o removing skid plate

Is this possible? It looks like it can be done, but the logistics of it might prevent it once I get going. Anyone done this?

Also, what size is the clamp that connects the front of the cat to the pipe? Is it the same 2.25" at the cat/muffler joint, or is it smaller? I have an FSM, but it doesn't say.

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post #2 of 13 Old 07-20-2006, 02:08 PM
blue1989yj
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I don't know if it could be done or not. I am fighting to get mine off so I can replace the exhaust right now. Hopefully the sawzall will get those last 2 bolts off for me tonight. I will let you know what I find. It will either be tonight or not until Sunday. Not having all tools when needed sucks.

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post #3 of 13 Old 07-20-2006, 02:42 PM
SimonTuffGuy
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When I had mine done, the shop had to remove the skid plate. I've heard it can be done without doing that though...
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post #4 of 13 Old 07-20-2006, 03:41 PM
pushead
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On my 88yj it took 10 minutes for me to pull it off. Skid plate was no problem.

Its not a jeep if it dont have 4wd.
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post #5 of 13 Old 07-20-2006, 04:17 PM
Brown Dog
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I know on my 4 banger, it can be done without too much problem. But it's easier with the skid plate off.

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post #6 of 13 Old 07-20-2006, 04:39 PM
RCHavok797
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There is no reason to try and remove the cat with the skidplate on since the skidplate comes off very easily. The only thing you need is a jack stand to support the tranny.

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post #7 of 13 Old 07-20-2006, 05:17 PM Thread Starter
bryris
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The jackstand isn't a problem. My concern is that the welds break on the nuts that are welding into the frame. Others on here have had problems with those nuts breaking off. I'd just rather leave it alone if possible.
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post #8 of 13 Old 07-20-2006, 05:51 PM
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I replaced the entire exhast from the manifold back last weekend and didn't pull the skidplate. It's a little tight, but not really a big deal.
I didn't want to pull the skidplate because the rear driver's side bolt was already broke off and when I tried the others, they didn't want to budge easily. Not worth all that drilling and tapping just to change exhaust.

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post #9 of 13 Old 07-20-2006, 10:20 PM
blue1989yj
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Every single bolt on my exhaust is a rusty nightmare. I started PB blasting 2 days ago. Every bolt so far has snapped. I a,m doing a full exhaust change but trying to leave on the skidplate as several bolts spin and do not come out. I am not a welder antd am trying to not have to cut, drill, and replace them all. I am having trouble getting any component to come off though. I have taken apart all of the clamps but the pipes seem fused together. Any suggestions for this. If I can't get results soon I will be buying a sawsall tomorrow and going to cut everything. Thanks for any tips. After I got a rediculous estimate of $850 with parts and labor, I just bought everything online for about $270. So far 6 hours and not a single piece off.....$850 sounds great about now, but I want to learn and have the satisfaction that I did it myself.

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post #10 of 13 Old 07-21-2006, 02:12 AM
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The shop did mine in about 10 min, 2 years ago, without removing anything. I was watching from the side and it seemed pretty easy. They just sawed the old one off, put the new one in (not original, mind you, but some aftermarket that was just to get me pass the emission tests) and welded it all together.
Really seamed nothing to it at the time...

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post #11 of 13 Old 07-21-2006, 08:33 AM Thread Starter
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Quote:
Originally Posted by blue1989yj
Every single bolt on my exhaust is a rusty nightmare. I started PB blasting 2 days ago. Every bolt so far has snapped. I a,m doing a full exhaust change but trying to leave on the skidplate as several bolts spin and do not come out. I am not a welder antd am trying to not have to cut, drill, and replace them all. I am having trouble getting any component to come off though. I have taken apart all of the clamps but the pipes seem fused together. Any suggestions for this. If I can't get results soon I will be buying a sawsall tomorrow and going to cut everything. Thanks for any tips. After I got a rediculous estimate of $850 with parts and labor, I just bought everything online for about $270. So far 6 hours and not a single piece off.....$850 sounds great about now, but I want to learn and have the satisfaction that I did it myself.
It is a bit&^. You aren't going to make any progress without a saw. I tried everything, even tried to rig up a puller to pull the two apart, didn't get anywhere. I went a bought a Dremel tool, and was able to get it off, but even then it was a bit&^. And as it stands now, I am going to have to pull out the Dremel again to remove the cat because it should probably be replaced too.

I am of the conclusion that exhaust basically sucks.
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post #12 of 13 Old 07-21-2006, 10:28 AM
blue1989yj
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Thanks. I am off to the store for a saw. What a PITA.

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post #13 of 13 Old 07-21-2006, 07:34 PM
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Take it to MIDAS, they'll put your cat on for like 30 bucks. Only takes about 20 minutes with the right tools.
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