It's left hand threaded into the main crank pulley. I usually apply some heat to where it attaches to the crank pulley and go from there. Be sure you hold the flywheel as you don't want to rotate the motor backwards.
Rick
Owner of 00 #1611 Silver (Totalled) 98.5 T-Red SVT #6180
Buckshot77@msn.com
Misc 3L parts for sale