1998 BMW 528 Camshaft

1 - What pressure in pounds should I apply to tight the camshaft nuts ref. 07 12 9 902 630?
2 - There is a tic-tic noise more or less in the middle of the head and when I connect it to the computer gives the following message "vanos mechanically stuck", how would I know when the vanos is damaged (what should I look for after I remove it)? Or could it be the Hydraulic valve lifters?
I am at 3000Km from the only BMW workshop in Mozambique and I'll have to do the repair by myself.