Hi again Paul,
We have a number of Victa aficionados here that will give you the correct advice, but I notice in the pic that the metal boss is still attached to the crankshaft. That will need to be removed before the lower crankcase can be removed. wink

There is a thread on boss removal, click HERE
Your engine is a full crank engine, but the procedure in the same. wink
cheers

Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member.
Kindest Regards, Darryl grin