Back in the late '80s we had to put a trans in our 57 6400. Since it was out, we did an in-frame freshen and pulled the head, pulled the pistons for rings and bearings and installed a new rope seal. Used a sneaky pete tool. Loosened the crank caps, pulled the old one and got the new one in place. Used a small screwdriver to seat the new seal as good as we could and cut the excess 1/16" proud. Pushed the excess into place and replaced the lower cap. No leaks.
