can I use lead to seal an exhaust leak>

Mopar Exhaust Systems

  1. pishta

    pishta I know I'm right....

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    I know it sounds funny, but lead can just pour into a void and harden up like...lead. It melts at a minimum 650F so it would need to get pretty hot down there to melt off? Heres the background story: My 35 year old Mazda B2000 had a muffler leak so I bought a new one and attemted to install it. It was a fully welded system so I had to cut and reweld the system. trouble is its near impossible to weld on top of an installed pipe, as well as on paper thin rusty exhaust pipe with a MIG or with slightly better results, a stick welder. So I got it welded back up and there are pinholes everywhere even afgter I ground down the birdshit welds of the MIG and stick welder. so I unbolt it (1 slip fit after the muffler) and try again to fill the pinholes and then blew a huge hole in the thin pipe. So Now I got a .38 sized hole in the side of the pipe at a 90 that I cant easily replace and come up with another idea to slip a larger piece over that patch job and weld that in. Im back to square one with welding that on as Ill blow more holes in it. So my idea was to slip a joint over the pinholes and back fill it with lead, holding the pipe vertical so it flows in. We did that with phone line splices years ago. There is no flexing on this joint. I doubt the pipe gets anywhere close to 650F even a foot after the cat.
     
  2. 67 gt

    67 gt A Wog boy who loves his Mopars ! FABO Gold Member

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    Pishta what about cutting a piece of pipe in half slipping it over the hole than using these 2 at each end.
    upload_2017-5-30_12-2-42.png
     
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    • RustyRatRod

      RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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      Quit bein a cheap ass and put an exhaust system on it.

      Even if the lead doesn't melt, the fumes alone from it could cause some unwanted results. Lead is some nasty stuff.
       
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      • pishta

        pishta I know I'm right....

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        Rusty, tell that to an OLD telephone splicer. They used that stuff every day, sometimes in manholes, for years on end. Itll probably get professionally done but Id like to see if this could work.
         
      • RustyRatRod

        RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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        Yeah well, that doesn't change anything now does it? People have done stupid shit since the beginning of time, but that doesn't make it right.
         
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        • 67Dart273

          67Dart273 FABO Gold Member FABO Gold Member

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          I think if I was in your shoes I would try and wrap sheet metal/ pipe around it and clamp that

          What instantly came to mind you talking about lead was "old school" sealing cast iron sewer / drain pipe. "Oakum" and lead. Made a VERY interestin' smell. My gramps was doing this when I was maybe 5 years old. I can still conjur up the smell
           
        • yellow rose

          yellow rose Overnight Sensation

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          All things health related aside, that seems like a pretty big hole to fill with lead. In my experience to get the lead to stick, the parent metal will have to be near red hot.

          I'm thinking cut out the bad pipe, get a new piece of pipe with both ends flared and slip that over the old tube and use clamps like pictured above.
           
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          • TrailBeast

            TrailBeast AKA Mopars4us on Youtube

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            If you don't know how to tack fill a hole tack a patch over it, because lead is going to be a PIA and possibly even pour in and partially plug your pipe.
            I also agree with YR in slipping a sleeve over both ands and clamping it, but I would probably use the U bolt style clamps since they have better crush for sealing.
             
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            • pishta

              pishta I know I'm right....

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              yeah, probably wont work if I have to get everything glowing. Ill go with the long SS lap-joint band clamp , cut the system in half again and use some stick to seal the holes ( Flux MIG just craters, I can back stick hole with copper spatula to fill) and use air pressure and a bottle of soapy water to test for leaks. Jeez what a can of worms! I just read that lead wont stick to clean steel. Well, none of this stuff is clean. I think the muffler is "aluminized"
              and the adapter is just straight slightly oiled exhaust pipe stock from a shop.
               
            • 340duster340

              340duster340 Well-Known Member

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              Why not jb weld?
               
            • pishta

              pishta I know I'm right....

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              couldnt hurt, right? Thought it didnt take to heat well. Maybe Ultra copper 700F RTV?
               
            • ed mullen

              ed mullen Well-Known Member

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              Walker Acousti/Seal applied to the edges of the patch.

              (Keep away from actual hole, within reason. It expands like Great Stuff (maybe not as much as Great Stuff does) when heated by exhaust and fills gaps, etc.)

              It will mushroom out a little, and fill the gap between the patch and the pipe inward from the edges.

              I had used it between head and cat on a late 80's VW. Heat is no problem for it.

              RTV will rely on cleanliness and thoroughness to seal well. Acousti/Seal is way more forgiving.
               
            • pishta

              pishta I know I'm right....

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              Walker Acousti/Seal...Thats the stuff I was looking for! Have to give it a try.
               
            • KitCarlson

              KitCarlson Well-Known Member

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              I will give a short course in economics, since you seem to ignore post #3. When trying to be cheap, one will attempt to spend less. Money and time is spent going for patches, and application on a rusty paper thin system, in the end just as much will be spent. It will not last like like a new one, so the fix will continue. I speak from years of experience doing it wrong.
               
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              • pishta

                pishta I know I'm right....

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                Cheap is a mission on this beater. I used VersaChem Muffler weld. Its like a gray paste, looks/acts just like JB going on. Turned to rock in 24 hours without heat. The system was not paper thin, only where I ground the weld to make it look pretty. Of course once you get a blow-through, its hard to start building with what took it down. Im totally satisfied with what I ended up with. Sealing pinholes with a stick or flux MIG is like killing gnats with a hammer. Replacing is a solution, but not this time.
                 
              • yellow rose

                yellow rose Overnight Sensation

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                Killing gnats with a hammer? What a waste of time.

                I use my shot gun on those buggers.
                 
              • 67 gt

                67 gt A Wog boy who loves his Mopars ! FABO Gold Member

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                Gnats ??? is this a hillbilly thing like claw dags ??? fill me in.
                 
              • pishta

                pishta I know I'm right....

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                Gnats are tiny little flies that just hang around your head and buzz in your ears, get in your eyes and up your nose. Pesky little F'rs.
                 
              • 67 gt

                67 gt A Wog boy who loves his Mopars ! FABO Gold Member

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                Thanks
                 
              • AJ/FormS

                AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s

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                Up here they go by the name of no-see-ums, and during certain times of the year, are a way of life. It gets worse the further North we go.And then there are; sandflies and blackflies and fishflies, and of course the mosquitoes are as big as horseflies,lol.
                 
                Last edited: Jun 5, 2017
              • famous bob

                famous bob mopar misfit

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                -----------------------------------------------Agree w/ this answer. I AIN`T EVEN GONNA READ THE REST OF THIS !
                 
              • pishta

                pishta I know I'm right....

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                And we've been burning leaded gas for how long? Some of you old timers know what that was.....C8H20Pb.
                 
              • RustyRatRod

                RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                Yeah but with a GOOD exhaust system, that goes out the tail pipe.
                 
              • pishta

                pishta I know I'm right....

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                Ha, how about the guy in front of you in the drive through back in '74 with that big overlap cam and the pig rich Holley? This would have been far downstream of any temps higher than what would re-melt or even re-fume lead, and the dangerous fumes are actually produced when you vaporize it. It's a moot point now anyway as I have sealed it with some muffler seal.
                 
              • Tooljunkie

                Tooljunkie King of cobble/master of the broken bolt FABO Gold Member

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                At the end of the day,frustration at its peak,what is your time actually worth?
                I run out of patience swatting mosquitoes,not to mention filling pinholes. Use a steel tig filler rod (read coat hanger) while tacking with the mig. It works but in the end its a waste of time.
                I send the tubework to the local shop,they can bend and install cheaper than i buy ready made pipes. As mentioned,here in manitoba the winged biting insects can get nasty. Two hands for welding, none left for swatting.
                 
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