Torque for most any 6mm bolt is like 7ft/lbs if you are going dry. Less if it is low carbon and more if it is 12.9 grade. It would probably be easier to use inch pounds to get a more accurate reading. Also, for this application I have not torqued them, I just snugged them up. I am all for torque values though so if the Bentley has them I would use them. If the Bentley doesn't have a spec then it really isn't needed. It has specs for everything.
I torqued to 10 ft/lbs and installed. And now it works great. The only thing I did was replace the o-ring on the bottom and the one under the lid.