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Step-by-step instructions for pictures in the forums
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Joined: Apr 2004
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Peggy M Online OP
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We have a tech tip from John "53John3100" Rooney on repairing a cracked engine block.

Good step-by-step and pictures.


Peggy M
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The only criticism I have is the pictures are too small. I don't mean the thumbnails but the "full size" image when the thumbnail is clicked on. It's barely larger than the thumbnail and difficult to see any detail.

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Peggy M Online OP
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Dang! They should not have been that small.



Last edited by Peggy M; Sun Feb 17 2013 02:58 PM.

Peggy M
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That is not how I was taught to use the pining method.
I was taught to install the first pin, than drill for the next pin so it overlaps the first one slightly, and the same for the rest. This way you reduce the chance for leaks.

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That's right pre'68. They should slightly overlap.

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He says he did fill all along it.

Last edited by Truckrolet; Sun Feb 17 2013 02:12 PM.

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The DVD they send you says and you can watch on the screen them actually repairing one step by step on how they do it with a narrator is not to do one then the next and so on, they say it weakens the block and you are drilling into some of the threads from the first pin, that is no problem but they want you to do that when there is another pin on the other side first for strength. Plus these pins threads pull into them selves they tell you instead of pushing out and spliting the metal. So they suggest every other one and then come back and fill them in, and a third pass if needed if you discover a leak when they are all in (I had to install one more in the middle of the row when I was done for a pin hole leak) The DVD and tech support person said every other so that is what I did, I suppose there are a number of ways they will work, but as long as the job gets done is all that matters to save the block. I only did one so not an expert by any means. BTW, if you get a chance check out the 3 foot hole in the cruise ship engine on their web site under "repair examples" or something like that, that they fixed with stiching pins saving the cruise millions replacing the engine. They have a string of pictures and I though it was cool looking at them. Good Luck to all with a cracked block. I am not a pro at all and if someone has a better way to do it then go for it. I just wanted to document my repair through pictures and the feeling that all is not lost just because you have a crack in the block. I felt lucky I found this method. Thanks to all the guys for all the help on my truck all along the way. That is the nice part of this web site all the help you can get from others.


Joined: Jun 2010
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Doing it as in the tech tip effectively accomplishes the same result as doing them one at a time. Spacing them out and then filling in the gaps is faster for sure. Welding in a sheet metal is done pretty much the same way and in the end, you get a monolithic repair.

Joined: Apr 2021
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11 Year follow-up. Hey John, how did that stitch repair hold up 10 yr down the road? I've got a small crack in the head of a 1950 GMC 216cc. Thanks for any wisdom you can share.

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A company in Turlock, CA 'Lock n stitch' has been doing these repairs for many years, small jobs to huge commercial repairs.
Check them out

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