More Engine Help

[leeuwin]

i need help in getting the cam gear off, as i am taking the head off, starts like this, i got everything out ready to unbolt the head and remove it but when undoing the tension bolts for the chain i slipped and threaded the bolt, i can get one bolt undone to make the chain slack enough to pull the cam gear off, but how do i get it off, do i just undo the bolt in the middle and it will come off? i just wanted to ask for some advise before i go trying in case i brake something.

the engine is single cam as well and its a chain not a belt so can't just slip it off.

[Harry-Hotpants]

what engine is it?

[leeuwin]

AU 4L straight 6