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Old 05-29-2019, 09:32 AM   #31
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Re: Changing Front Catalytic Converters 2003 Pathfinder


I just cut them off with a sawsall and weld the new ones in place. But I know your in your driveway and I'm a shop. I worked on the ground for 3 years at my house before I got a shop so I know your peril.
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Old 05-29-2019, 12:34 PM   #32
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Re: Changing Front Catalytic Converters 2003 Pathfinder


Thanks for the link huesmann, I appreciate that a lot. I thought sure one of the parts places around here would have some type of heat wrap. I did how ever find a complete set of used heat shields for both sides on ebay, I am just not sure I want to wait that long for them to be shipped. Our Toyota 4X4 doesn't have AC and it is really hard for my wife to breath in the heat. So I need to get this one back up and running soon.

BB, I sold my cutting torches and welding rig a few years back, I didn't think I would ever need them again, that was a mistake. The other three shields came off without any problems, just this one with the bolt in a really really hard to get to place that gave me fits.

Laying on the ground (gravel) for the past week or so has really done a number on my back, I can hardly walk today, let alone crawling back under the truck, so I am just sitting around feeling like I really have got to get back out there and finish.
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Old 05-29-2019, 12:40 PM   #33
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Re: Changing Front Catalytic Converters 2003 Pathfinder


I was just thinking about what BB said about cutting the cat off and welding another one in place. This converter you can't cut it off and weld another one in place, see the photo of the ones I have. It would sure be nice if I could to that though.
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Old 05-29-2019, 07:01 PM   #34
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Re: Changing Front Catalytic Converters 2003 Pathfinder


I just couldn't stand doing nothing today so I gave a try to straightening out the mess I made of the heat shield. Surprisingly it went pretty good. I beat it fairly close enough that I could bolt it back on the old converter, I then continued to shape it and form it back as close as I could to normal. It fits pretty good now with just a couple of cracks that are open maybe 1/16 inch or so.

I bought some high heat wrap that is made to wrap the converter. I plan to wrap the converter at the cracks to keep any heat that may be harmful from escaping. Then install the beat up shield over that.

I do have a question, I have searched all over the place even the manufactures manual and can not find the torque specs for the bolts in the exhaust system, especially the converter to manifold. But do need pipe to converters torque specs as I have all that apart and will need to go back together.

The front converters I bought didn't have any studs to bolt the pipe back to the converters. I just bought regular 10mm bolts and hope that is correct. I couldn't get the studs out of the old converter.

This is a 2003 Nissan Pathfinder LE 3.5L RWD.

The more I look at these converters the more I am sure they have been used. The stuff looks yellowed and the back side looks like it is black from exhaust. Man I sure hope these aren't bad, one time around with these is more than enough for me. I will get some photos of them just in case they are messed up.
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Old 05-29-2019, 09:22 PM   #35
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Re: Changing Front Catalytic Converters 2003 Pathfinder


Did you spy a torque spec for the exhaust manifold to head.

I would shoot for near that, if I could find it.

Should be "good enough for gov't work".

I know that you said that you sold your Torch set, those cracks could be sealed with a mild steel rod, and torch, then wrapped with the wrapping.



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Old 05-29-2019, 11:27 PM   #36
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Re: Changing Front Catalytic Converters 2003 Pathfinder


I remember back in the 60s using a coat hanger to weld some things using a torch, it worked back then, I wish I had a torch now. I plan to put the wrap under the heat shield and hope for the best.
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Old 05-30-2019, 01:24 AM   #37
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Re: Changing Front Catalytic Converters 2003 Pathfinder


Man, I think I am going to be sick. I looked up the torque specs for this truck and it is Nm. I don't have a clue how to use this system. Why can't something be simple today.
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Old 05-30-2019, 07:22 AM   #38
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Re: Changing Front Catalytic Converters 2003 Pathfinder


https://www.metric-conversions.org/e...oot-pounds.htm
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Old 05-30-2019, 11:27 AM   #39
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Re: Changing Front Catalytic Converters 2003 Pathfinder


Quote:
Originally Posted by carmusic View Post
That is just too cool, thanks a ton, I really do appreciate this link, I saved it.
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Old 05-30-2019, 12:31 PM   #40
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Re: Changing Front Catalytic Converters 2003 Pathfinder


I just learned something really cool today, check out this video, stick with it all the way through and it will become really clear. The video just taught this old dog a new trick. I never understood why in the world throw away perfect looking bolts and replace them with new ones. Now I know, this video explains why.


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Old 05-31-2019, 11:11 PM   #41
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Re: Changing Front Catalytic Converters 2003 Pathfinder


My stars, I am making a second career of changing out these catalytic converters. If anything can go wrong, it has. I finally got the one on the passengers side on and the heat shield I mangled fit perfect, the bottom one doesn't fit, the screw holes are way off. I have one screw in and I will jury rig them by using two large hose clamps to pull them tight. Man I hate doing stuff like that.

Here I have been wanting to downsize my shop by selling a lot of my wood working tools and I am buying all kids of mechanic tools just to get this truck back on the road.

I thought I would never get the upstream 02 sensor off then back on, that thing is in a place that is next to impossible to get to.

I am too old to be crawling around under a truck. I also noticed the A frame bushings need replacing, at least that will be easy. Now if I can just get the drivers side cat off and the new one on, this part will be history, putting the rest of the exhaust system back on will be a breeze.... I hope. LOL
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Old 06-01-2019, 07:30 AM   #42
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Re: Changing Front Catalytic Converters 2003 Pathfinder


Got a creeper?
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Old 06-01-2019, 08:47 AM   #43
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Re: Changing Front Catalytic Converters 2003 Pathfinder


Quote:
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Got a creeper?
Don't I wish. Our driveway is gravel. I have one of those plastic things used on carpet that is under a computer chair to lay on, beats laying on rocks. lol

If these converters don't work, I am not going to be happy. I still think they were used and returned, although the people where I bought them assured me they only sold new parts. There is black soot in the tail end of the converters like on a tail pipe, but everything else looks new except the intake side is yellowed.
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Old 06-01-2019, 09:39 PM   #44
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Re: Changing Front Catalytic Converters 2003 Pathfinder


I got the passenger side converter and 02 sensor, plus the other down stream cat and 02 sensor hooked up.

I did finally get the drivers side cat and 02 sensor off. Part of the 02 sensor had come loose and was embedded in the cat. The cat on that side was way worse than the passenger side.

I got the new cat and 02 sensor installed. Then for the next three and a half hours I did everything I could think of to get the heat shields back on. I finally gave up and went in and had supper.

15 minutes after I got in the house it dawned on me how to get that one dad blame heat shield back on. It was impossible to see anything as it was within an inch of the frame, all I could do is chance putting the screw in the shield hole and try to accidentally hit the hole were the screw goes. Did not happen.

All I need to do Monday is cut the heads off three screws that will fit in the screw holes on the converter, then put the shield on until it lines up on the cut off screws. When the shield goes on the cut off screws, then I can remove one cut off screw at a time and install the screws and there ya have it. I wish I had thought about that way sooner, the truck would be done now.

How do you pros put that impossible heat shield back on? The one that I can see will be a snap to put on, but the one I can't see is one really tough cookie.
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Old 06-03-2019, 05:26 PM   #45
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Re: Changing Front Catalytic Converters 2003 Pathfinder


Well I got the other catalytic converter on and it is the wrong one, unless I installed it wrong. In the photo below see the little protruded V shaped deal, it is supposed to align with the other little protruded V shaped deal on the manifold, right. If it is then I installed it right and they sent me the wrong converter. When I put the rear converter straight like it is supposed to be you can see how much gap is at the flange. I am not sure rotating it would do any good, but I may try.
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Changing Front Catalytic Converters 2003 Pathfinder-cat-aline-mark.jpg   Changing Front Catalytic Converters 2003 Pathfinder-cat-wrong-4.jpg  
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