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The best epoxy/jb weld for exhaust side block externel crack

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  • The best epoxy/jb weld for exhaust side block externel crack

    Ok guys as per my previous post I have a crack on my motor block behind the exhaust manifold that has been previously JB Welded obviously it was not prepped right and is leaking again not too bad from what i can see I am contemplating pulling the exhaust manifold and re-prepping and resealing the crack ............ My question is what is going to be my best option on type of epoxy / jb weld / and or sealer to use any and all advice and help is appreciated ............. THANKS GUYS
    sigpicGREASE MONKEY'S MOTTO "IT AIN'T EASY BEIN GREASY"

  • #2
    Re: The best epoxy/jb weld for exhaust side block externel crack

    From what I used JB weld on in the past years that crap don't hold up to heat very well at all. As you can see! maybe pull the head and get a new one. Your call! I know it's not the answer your looking for.
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    • #3
      Re: The best epoxy/jb weld for exhaust side block externel crack

      Right well all i wanna do is get it through this season and maybe next because i know i can get a new long block for $1500 which is a pretty good deal considering I only have half that in the boat and trailer
      sigpicGREASE MONKEY'S MOTTO "IT AIN'T EASY BEIN GREASY"

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      • #4
        Re: The best epoxy/jb weld for exhaust side block externel crack

        Wow this is suprising 70+ views and only one reply ? surley im not the only one that has faced this problem
        sigpicGREASE MONKEY'S MOTTO "IT AIN'T EASY BEIN GREASY"

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        • #5
          Re: The best epoxy/jb weld for exhaust side block externel crack

          Based on where the crack is on the block, are you loosing fluids, oil, water, or cylinder pressure??
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          • #6
            Re: The best epoxy/jb weld for exhaust side block externel crack

            JB weld if that how ya wanta fix it.. Prepped well.. It will hold for a long time.. I would use the good ol regular kind.. The kwik is crap...

            It won't hurt nothing to use it on a external crack.. Good Luck
            sigpic

            87 Four Winns 170 Horizon 4.3 OMC COBRA"Only Child"
            only thing GM I own.. Of course it's the only one that gives trouble..
            2004 Ford STX 4x4.
            2011 Candy Apple Ford Mustang GT
            Hope all you want.. It won't get it fixed..

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            • #7
              Re: The best epoxy/jb weld for exhaust side block externel crack

              On the manifolds I repaired , I mixed regular JB weld with fiberglass. I just bought a piece for auto body repair and pulled it apart into strands... cut it up and mixed it into the epoxy. dremel'd out the crack - drilled the ends and cleaned with brake clean.
              Those manifolds lasted many years.
              Baba-buoy.

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              • #8
                Re: The best epoxy/jb weld for exhaust side block externel crack

                not losing any fluids and compression is all good the crack is in the block behind the manifolds and i dont have any oil in the water
                sigpicGREASE MONKEY'S MOTTO "IT AIN'T EASY BEIN GREASY"

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                • #9
                  Re: The best epoxy/jb weld for exhaust side block externel crack

                  Marine-Tex far better than JB for fixin cracks...
                  You meet the nicest people at the American Legion.
                  "maintenance is always cheaper than neglect"
                  "certain parts are USCG approved for a REASON"
                  "just because it's in the factory service manual, doesn't mean it's correct"

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                  • #10
                    Re: The best epoxy/jb weld for exhaust side block externel crack

                    Originally posted by matthew colgate View Post
                    not losing any fluids and compression is all good the crack is in the block behind the manifolds and i dont have any oil in the water
                    Be sure to stop drill the crack first or it will continue to crack!!


                    and if you are not loosing water, oil, or no water in the oil or vice versa then prep the area and use the high temp product. Most epoxies get soft over a couple hundred degrees if they aren't designed for High Temp. applications
                    There is no unhappiness like the misery of sighting land (and work) again after a cheerful, careless voyage. Mark Twain
                    T
                    The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails. ~William Arthur Ward

                    Never argue with a fool, people might not know the difference.

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                    • #11
                      Re: The best epoxy/jb weld for exhaust side block externel crack

                      it is leaking water out the crack I can see where it has been repaired before I assume it wasnt prepped properly looks like it was just smeard on there lol
                      sigpicGREASE MONKEY'S MOTTO "IT AIN'T EASY BEIN GREASY"

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                      • #12
                        Re: The best epoxy/jb weld for exhaust side block externel crack

                        J B weld is suppose to handle 500 degrees... It should be able to handle it..

                        You should drill the crack
                        sigpic

                        87 Four Winns 170 Horizon 4.3 OMC COBRA"Only Child"
                        only thing GM I own.. Of course it's the only one that gives trouble..
                        2004 Ford STX 4x4.
                        2011 Candy Apple Ford Mustang GT
                        Hope all you want.. It won't get it fixed..

                        Comment


                        • #13
                          Re: The best epoxy/jb weld for exhaust side block externel crack

                          I have had good sucess with JB weld in the auto industry... Like posted end drill the crack on both ends to prevent it from spreading,V grind the crack,clean it well with acetone,blow it dry with compressed air, rough up the surrounding area and apply your weld. I've found thin layers are better than a big thick coat.....if you need to build up.
                          87 Four Winns 210 Horizon 350 Merc/Alpha 1


                          Resto Thread 210 Horizon https://forums.iboats.com/showthread.php?t=458229

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                          • #14
                            Re: The best epoxy/jb weld for exhaust side block externel crack

                            DRILL ? THE BLOCK ? WOW now im nervous sweating bullets over here how big of a drill bit and how far do i drill into the block ?
                            sigpicGREASE MONKEY'S MOTTO "IT AIN'T EASY BEIN GREASY"

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                            • #15
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                              Re: The best epoxy/jb weld for exhaust side block externel crack

                              Ayuh,... Just drill an 1/8" or 3/16" hole into the Very End of the crack to stop it from spreading....

                              I agree with the above posters,...
                              JB Weld in/ on a Cleaned up block will work just Fine...

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