I'm fixing up my detached garage built in the early 1900's. At some point there was some movement in the walls (not the slab, the walls are built next to the slab). There doesn't seem to be any more movement; however, there are cracks left between the blocks (none of the blocks themselves are cracked). It seems to be a combination of some decay in the mortar and the settling.
The largest crack seems to be about 3/4" wide and runs from the bottom of the wall zig-zagging up about half way to the corner of the wall.
What would be the best way to fix these cracks? Cleaning them out and adding more mortar?