You dont need to use cam locking tools on that engine (or any of the Volvo 5 pots) unless you are removing the cam sprockets.
If the engine is cold, tensioner should sit in the 11ocock position.
https://www.youtube.com/watch?v=Emsa-w-n93s
Go to 6min 15 seconds of the above video link which explains the tensioner settings on these volvo 5 pot engines.