I found the following info in the 1981 Technical data passenger car manual.

For the 81 240D 123.123 chassis with 616.912 engine

max speed no load 5300 rpm
Output (at clutch) 52 KW (72 HP) @ 4400 rpm
Torque 137 NM @ 2400 rpm

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked