Have a read through this, which is quite involved but it shows you how to get to as far as taking off the top timing covers quite quickly if you need to. It seems a lot but it is a very detailed write up but hopefully you won't need to go that far.
i took hundreds of fots to remind me how to put mine back together as my memory is that of an old goldfish

http://www.beisansystems.com/procedures/m62tu_vanos_procedure.htm