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Discussion Starter · #1 ·
I knew I should have gotten my 4Runner inspected BEFORE I took it wheelin' <IMG SRC="smilies/rolleyes.gif" border="0">

I now have a little exhaust leak in the downpipe, right where the 2 pipes from the exhaust manifold join into 1, salt must have sat there and rusted a little hole which opened up from the 4Runner's first wheelin' trip this past weekend. I want to fix this as cheap as possible, since I'll put a header on there eventually. I just need it to last for a week or so. Would JB Weld work? Any other ideas?

Thanks for any info <IMG SRC="smilies/biggrin.gif" border="0">
 

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jb weld would work but it would eventually crack and fall off if the temp is way to high, but it should do the trick. my blazer had a leak somewhere and i smogged it anyways and it passed with flying colors! jiMMy
 

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<FONT COLOR="Red"> Sandblast out the rust and weld it up... </FONT c>
 

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Discussion Starter · #4 ·
Originally posted by Slick:
<STRONG><FONT COLOR="Red"> Sandblast out the rust and weld it up... </FONT c></STRONG>

Yeah, that would work great, but I'll wait until I take it to my welder friend in a couple weeks for some rocksliders. I think I'll just try mashing some JB Weld in there the day before I get it inspected. Many people might not even notice, but I can hear it, and found the spot at lunch break. I can't even see it, just feel the exhaust escaping.
 
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I put a new Cat on an '89 Daytona, and to get the old one off, I had to slice along the exhaust pipe. It was really stuck in there. I cut a little too long, and when I put the new cat in , there was a gap, causing a small leak. I patched it with JB Weld a few days ago and it's been fine, but like said above, the heat will probably crack it out. But for now, it worked great <IMG SRC="smilies/biggrin.gif" border="0">
 

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I had a cracked header that I patched with RTV Red, and the high temp metal tape
that they use on HVAC systems.

It was just a hack, but it got me by until I was able to get it welded back together.

I had to redo it several time. Some lasted a couple of days. Some lasted a couple of weeks.

Sand it at least to try to get a good bite.

[ 09-26-2001: Message edited by: Dan-H ]
 

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Yeah the red RTV or The copper stuff kicks ass too. It lasts longer than JB because JB is basically plastic. The RTV is made for that heat. I use it to seal the pipe to the manifold and it makes it a bitch to take off its so sticky. It doesnt burn off the manifold after a year or so so it aint going no where off the pipe itsself.
 

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Discussion Starter · #8 ·
I'll give the high temp RTV a shot! It's right in the base of the Y, so it should hold a big glob fairly well. I'll see if I can reach up in there and sand it a bit first also. <IMG SRC="smilies/cool.gif" border="0">
 

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Originally posted by Vermont_Toy:
<STRONG>I'll give the high temp RTV a shot! It's right in the base of the Y, so it should hold a big glob fairly well. I'll see if I can reach up in there and sand it a bit first also. <IMG SRC="smilies/cool.gif" border="0"></STRONG>
The trick is keeping it on with the exhaust pressures. Just puttin a glob on will last about 5 minutes. You need to mechanically hold it there. Try a hose clamp or bailing wire but try to fashions some metal that fits the crack or slot or hole or whatever and then put a glob on the hole, then put the metal over the glob and then clamp or somehow keep it from going anywhere.

anyway, its a hack but it might hold.
 

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Hell, when I was younger, and blew the side out of my muffler, I tried a patch of JB Weld, and bailing wire. It didn't hold! The JB Weld melted away! I would suggest sandblast and weld.

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