If the crack is in the outside of the water jacket you can repair by several methods. Brazing or welding. Another technique I've seen is to start out at the very end of the crack, and drill a hole, tap it, insert a soft bolt, break it off and grind it smooth. Mover over about 2/3 the width of the bolt and do this again. (that is overlap the first hole/bolt with the second) and keep going until you get beyond the other end of the crack. If you want to make all of this look more natural, go over the entire repair with a needle scaler to roughen up the ground off surface. Will make a repair that is tight and un-noticeable. If the crack hasn't opened up too wide, you may be able to do it with 1/4 bolts or all-thread.

Contributed by Wayne

Brazing and welding are great if done by someone with lots of cast iron experience. The overlapping plug method is good, IF the very ends of the crack are located. It would seem to me that 1/8 inch pipe wlugs are a bit large, but I'm sure would work fine. I don't know where to get it, but there is a rod made for this; you just thread the end of it, screw it in, cut off, and repeat. My dad repaired a cracked block in a 1930 Chevrolet with a copper plate attached by drilling and tapping holes for screws into the block.

Contributed by Don Young

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