1986 420 SEL Valve Compensator

Yesterday, I replaced the valve cover gaskets on my 1986 420 SEL. Whilst removing one of the valve covers, my fingers brushed against one of the large nuts at the bottom of the valve clearance compensating element, and I realised that this nut was loose. I checked the other nuts, and found them to be all tight, so I tightened up the loose one as best I could in the confined space with an adjustable spanner. My question is should these nuts be tightened to a specific torque, and does the torque setting play any role in the valve train clearance/operation? My car did have and still has a quiet valve train. The nut I am referring to is shown at the bottom of the attached picture, which was borrowed from a previous post by rstarkie.