The engine actually turns pretty easily (S-60) by using a 3/4 drive socket on the nut holding the accessory drive pulley located on the LH side of the engine (as we face it).

If you want the engine to spin but not start trip CB #19,20.21 (you need to verify this because I am going by memory). Those breakers are the DDEC breakers and the engine will not run unless DDEC is powered up.