Does anyone know a firm that either does metal stitching to repair cracked cylinder water jackets or supplies consumables for me to do the repairs.
Epoxy is garanteed only up to 60 degrees c on the wet side and weld or brazing is likely to make things worse, especially as wastage on the inside has made the wall thin in places.
Most engine reconditioners will be able to do that repair for you. They would probably also supply just the plugs if you wanted to do it yourself but I doubt many would lend you the tapered taps (you would need to buy your own)
If you want to do it yourself, Ayross trading sell the plugs, tapered taps etc.
If you have never done this type of repair before, and your item is somewhat hard to replace then I recommend that you get someone experienced to do the repair (as once a stitch repair has been attempted and it fails then it's usually not easy to fix). We always used to pressure test the repair on a proper pressure tester that circulated pressurised coolant at engine operating temperature.
the cracks are from frost on the outside and fortunately the bores and pistons are pretty good. I have asked around engine reconditioners but the usual response in this throw away age is that "all the old fellas have died". I have a rough estimate from a mob in Sydney who can also cast pieces of iron to stitch in; $2.000 to $3,000. Obviously experts but phew, that price hurts.
I will follow up the Ayross lead. I am also onto www.lockinstitch.com in the States whose products look more specific to the task. They make it look easy on Utube anyway.
David - Magna electrodes are still available, they never have any storefront, they use travelling commission agents to sell their products. There's still a Magna commission agent in Perth.
You just need to see the bank manager about an overdraft, before you buy a packet ..