valve adjustment w/no cam specs

I don't know the specs of the cam in my 318 and would like to check/adjust the valves. Is there anything I can do short of pulling the cam out. Is there any symptoms of needing a valve adjustment.
I would like to order a valve adjustment wrench but don't want to pull my covers off before I'm ready to do it, is the wrench size pretty standard for a 318; if so? Thanks Peace Adrian