Re: The best epoxy/jb weld for exhaust side block externel crack
No not welding... What they do is drill little holes all along the crack.. then fill the holes with bolts screws.. Whatever...Here I found these instructions online..
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Drill the holes for the stitching pins. This is done with the drill spacing fixture and your drill. The holes are drilled along the length of the crack. Note that the spacing fixture will leave space between each hole.
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Spotface the holes to accept the shoulders of the stitching pins. Be careful not to spotface too deep - make sure you know how thick the casting walls of your block are and keep in mind that you need at least four threads in the casting after tapping.
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Tap the holes using the special tap provided with your kit.
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Install the first set of stitching pins. Review the kit instructions. Generally the pin heads will break off when a certain torque is reached.
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The second set of holes are drilled between the first set of installed pins. Again, spotface and tap these holes, and install the stitching pins.
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Drill holes in any remaining spaces between the installed pins, spotface and tap. Then install the final stitching pins.
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Locks are used to supply additional strength to the metal repair. Determine lock placement based on the specific instructions given with your kit. Depending on your crack and the repair kit you purchase, you may need to install more than one lock. Now drill the lock pattern or patterns into the block using the supplied drill jig.
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Hammer the lock or locks into place. The lock helps keep the crack from extending and keeps the repair tight.
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Grind down the repair to be flush with the surrounding metal. Inspect for gaps and make sure that the crack is completely repaired. You may then texture the repair using a needle scaler. You are done!
Things You'll Need:
* Metal stitching kit from Lock-n-Stitch.
* Hand held drill
* Hammer
* Die grinder
I don't really think it has to be that fancy.I never even heard of lock n stitch pins. I saw it done with regular bolts.. Ground down smooth.. It looked tough... If ya couldn't get away with a replacement for awhile.. I would look into it..
Good Luck
