Welding Cast Iron Engine Block Repair. Aluminum welding has its own cons as it is more prone to cracking. The initial welds and tie-down passes also repair the stretched and stressed areas of the original block casting.
Take a piece of metal screen and slather it with epoxy JB weld. It is possible to weld cast iron using an arc welder and the proper welding rods but that often can cause deformation to your engine block or leave the welded area far more brittle and susceptible to further cracking. What might seem like a disastrous situation does not necessarily mean the end of the engines lifespan.
Its easier to do when the block engine is made up of iron cast.
This means soaking the engine block in boiling water to remove any leftover oils that may be present. 2 Weld patches in place using short welds about 1 inch 25 cm long each. Take a piece of metal screen and slather it with epoxy JB weld. Then wirebrush it again with a DIFFERENT BRUSH to get rid of any ash residue.