P reg 208d sprinter head gasket replacement?

My Sprinter 208D has the old 601 engine (2299cc) and a blown head gasket. How do I remove, and replace, the duplex timing chain etc. to allow me to remove the head without causing problems with the timing when I re assemble. I would sooo much rather not have to remove the fronts of both the van and engine if this is possible!
Many thanks.