In my experience the best way to fix a crack is from the outside.
typically digging down to the weeping tile, finding the
crack, cleaning the
surface and then sealing the crack with both
sealant and a membrane.
the inside wall doesn't prevent the water from entering your
done this myself several times simply using a shovel and simple
Depending where the crack is you may need to avoid gas lines etc.
blueprints and approving the dig generate additional