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Interesting example of lock stich rep...

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andrew
Posted on Wednesday, December 19, 2001 - 07:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Here is a link for a sequence of photos of a repair to a modern OMC marine engine freeze crack. No endorsement intended... just thought it might be of interest. I have used the Lock'n'stitch method and components for much simpler repairs than this... just a basic crack. But it worked well and held tight.
Regards,
Andrew
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peter ogborne
Posted on Friday, December 21, 2001 - 08:01 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Andrew ,did you use the method as described .........I have done it but it is a very tedious job . It proved to be ok but I just drilled a series of overlapping holes ,tapped them 3/16 BSW and screwed in short steel gutter bolts [ with a bit of Loctite ] .I dressed them all down with an emery disc and it is OK . But I prefer the epoxy method .
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andrew
Posted on Friday, December 21, 2001 - 10:36 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Peter,
Yes... used the method and parts from the Lock'n'stitch company. It was tedious, and I ended up making a small jig to make sure I would drill the overlapping holes properly and not wander off. The screws that they provide have a unique thread that helps pull the two sides of the crack together. The screws have a square head that breaks off easily to allow the finished job to be flushed off. The supply a locktite type compound too.
The parts are expensive. If epoxy will work in a give application it is certainly faster, and cheaper.
Some of the repairs that the show on the Lock'n'stitch site are in areas where epoxy would not be strong enough. See the head repair .

Regards,
Andrew
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Ernie
Posted on Friday, December 28, 2001 - 07:27 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have used this method as well. I remember years ago doing the top of a cylinder across the top of the block and down into the exhaust valve seat. Carefull finishing of the cylinder, huge flat file on the top of the block and recut the valve seat. It was a 6 cylinder flat head Ford in a truck. The repair lasted for years. They make the stitching plugs out of cast iron so there is not an expansion problem.
Hope your holidays go well
Ernie

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