timing chain broken

Hi all Ivee dropped the engine out of my A140 as the chain snapped on 64000 miles gggrrrrr the crank shaft pully I guess that comes off with a dirty great big allen key then lol is there a tool I can purchase for this or is there an easier way of getting it off so I can remove the casing also...

Disaster has struck! Timing chain and/or chain tensioners have broken. Either way, the engine went "BANG" and died. The tappets no longer work, no compression to speak of and the hood is still down - so there is no doubt on the diasgnosis nor of my predicament. The questions are: - what...