I have had a low speed clunk in the front end of my W115 for a week or so, and finally got a chance to check it out. The driver's side rear bolt of the subframe took almost 3 full turns, all the other bolts were snug. This seems to have cured the issue

Is just tightening it as it sits ok or do I need to take the weight of the motor off the subframe then tighten? Also I couldn't find any torque specs for these bolts is there one?

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1972 280SE 4.5