The W116 factory manual is still available on W116.org.

The 300SD engine (OM617.950) in the W116 chassis is virtually identical to the OM617.951 and OM617.952 used in the later 300SDs and 300Ds. There are a lot of other similarities in W116 suspension and brakes etc as well.

Rick

__________________
80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)