lock the fly wheel up, big solid bar (not ratchet) and a hammer.

bit of heat will work wonders as well
best with 2 or 3 of ya. 1 to hold the engine and one to do the bar.

if the hammer dont work then stick something like a scaffold pole over the bar and try that.
if u have a spare person get them too keep an eye on the socket on the bolt. u dont want it to slip and damage the bolt or u will be really stuck.
so if they shout its slipping the stop asap.

it WILL come so keep trying. my mate got annoyed coz he couldnt do it. he went to the hassle of getting a van and getting the engine to my house. all i did was locked the fly wheel, heated it up and used a long bar to get it off.


good luck