How To Weld Aluminium Engine Block. With the stitches in place apply the epoxy into the crack as far as you can put it and then fill the crack completely. Engine Casting Number M60B30 1 725 970 or 1 741 212 M60B40 1 725 963 or 1 742 998 Welding the cast aluminum isnt a problem.
After cleaning the crack with a wire brush you should wipe it down with rubbing alcohol. If a engine block develops a crack JB Weld. Use softer stones for aluminum.
Use an epoxy compound suitable for engine block repair.
Cast will weld with 4043 and 5356 filler wires. Keeping this in consideration can a cracked aluminum engine block be repaired. Its best to use a filler rod that is similar to the engine block alloy to achieve a stronger weld. Only the M60 and the European M52 engines are affected.