I'm ready to disassemble the long block for overhaul.  Have removed the front cover, oil pump/chain, counter weight and thurst bearing in the front and  fly wheel, counter weight.   I have the Turrentine video tape for the 13B and will be assembling the e-shaft tool for separating the crank.   My question is:  when do I need to separate the e-shaft?   My understanding is that the shaft must be separated in order to complete disassembly.  Is the separation between the 1st and 2nd concentrics or the 2nd and 3rd ?

Thanks for the help
Fred Vandeman  Velocity XLFG